Create dll with arrays and call it
I am trying to create dll with labview in order to pass a 2d array to the main program. The problem is that I don't really know how to create the function to call it (I don't know much about pointers)
The function I have created to call the dll is void Untitled1(TD1Hdl *Array1) which is suposse to return the array created on it.
For example, in the program attached, how should I do to pass the array to another program using dlls?
Thanks a lot,
Juanlu
Attachments:
Untitled 1.vi 7 KB
The code you've provided doesn't do anything (just a control wired to an indicator) so I'm not sure what you're asking here.
If I understand correctly, you want to build a DLL from your LabVIEW VI. From what language will you call that DLL? There is no standard way to pass a 2-D array. If you can convert to a 1-D array, you can use a simple pointer. With a 2-D array, you're stuck with LabVIEW's array representation (the TD1Hdl type), which means that whatever code calls that function will need to understand the LabVIEW data type and how to manipulate it.
Similar Messages
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Create DLL from labview and calling it from other application
I have an application built using Labview. I wanted to create DLL out of it. The application has
two String inputs start and stop buttons and two status indicators.
1. How to itegrate start and stop buttons from function prototype?
2. Does Labview created DLLs requires labview runtime engine when it is to be called from other application?
Can some one help on this.
Solved!
Go to Solution.Hi Yuvish,
1) They should be boolean inputs to your VI. But does it makes sense to provide a stop button input at the start of your VI? (THINK DATAFLOW!)
2) Yes, the LV-RTE is needed...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome -
Hello.
During developing Domain Index for Oracle 11.2.0.1.0 (problem also appears in 12с) i was faced with misunderstanding of parameter types of function
ODCIIndexInsert in case of creating indextype WITH ARRAY DML option
According to Oracle documentation
http://docs.oracle.com/cd/E11882_01/appdev.112/e10765/ext_idx_ref.htm#i76892
In case of WITH ARRAY DML option Oracle will invoke ODCIIndexInsert with following signature
FUNCTION ODCIIndexInsert(
ia ODCIIndexInfo,
ridlist ODCIRidList,
newvallist varray_of_column_type,
env ODCIEnv)
RETURN NUMBER
In my case indexed column has datatype NUMBER so i defined varray_of_column_type as SYS.ODCINumberList
STATIC FUNCTION ODCIIndexInsert(ia in sys.ODCIIndexInfo, ridlist in sys.ODCIRidList, newvallist in sys.ODCINumberList, env in SYS.ODCIEnv) RETURN NUMBER
Indextype was created as
CREATE INDEXTYPE test_index_type
FOR
test_eq(number, number)
USING index_methods
WITH ARRAY DML(number, sys.ODCINumberList)
WITH LOCAL RANGE PARTITION
WITH SYSTEM MANAGED STORAGE TABLES;
or
CREATE INDEXTYPE test_index_type
FOR
test_eq(number, number)
USING index_methods
WITH ARRAY DML
WITH LOCAL RANGE PARTITION
WITH SYSTEM MANAGED STORAGE TABLES;
(problem occurs in all cases)
CREATE TABLE test_table (id NUMBER (19,0));
CREATE INDEX test_index ON test_table(id) INDEXTYPE IS test_index_type;
When attempting to insert data in the table
insert into test_table values (1);
oracle raise exception
Error starting at line 53 in command:
insert into test_table values (1)
Error at Command Line:53 Column:1
Error report:
SQL Error: ORA-29925: cannot execute SCOTT.INDEX_METHODS.ODCIINDEXINSERT
ORA-06553: PLS-306: wrong number or types of arguments in call to 'ODCIINDEXINSERT'
ORA-06553: PLS-306: wrong number or types of arguments in call to 'ODCIINDEXINSERT'
29925. 00000 - "cannot execute %s"
*Cause: The specified function does not exist or does not have an
appropriate signature.
*Action: Implement the function with the appropriate signature.
So my question is.
Is it normal behavior of oracle (according to documentation)?
What is correct signature of ODCIIndexInsert function in case of INDEXTYPE creation with 'WITH ARRAY DML' option and fact that indexed column has NUMBER datatype?
By the way if i define indextype without 'WITH ARRAY DML' option signature is clear, and working. But this approach doesn't satisfies our performance needs.
Also if i define index type with option 'WITH ARRAY DML WITHOUT COLUMN DATA' and use signature
static function ODCIIndexInsert(ia sys.odciindexinfo, ridlist sys.odciridlist, env sys.ODCIEnv) return number
Everything works too. But this approach doesn't satisfies our business needs.
Is it a way to define ODCIIndexInsert parameter types (in case of indexing number column) so that batch inserting works according to documentation ?
FUNCTION ODCIIndexInsert(
ia ODCIIndexInfo,
ridlist ODCIRidList,
newvallist varray_of_column_type,
env ODCIEnv)
I am attaching full sql script to recreate environment and reproduce the problem.
Type definition:
CREATE OR REPLACE TYPE index_methods AS OBJECT
step number,
STATIC FUNCTION ODCIGetInterfaces(ifclist OUT SYS.ODCIObjectList) RETURN NUMBER,
STATIC FUNCTION ODCIIndexCreate (ia SYS.ODCIIndexInfo, parms VARCHAR2, env SYS.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexAlter (ia sys.ODCIIndexInfo, parms IN OUT VARCHAR2, altopt number, env sys.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexDrop(ia SYS.ODCIIndexInfo, env SYS.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexExchangePartition(ia SYS.ODCIIndexInfo, ia1 SYS.ODCIIndexInfo, env SYS.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexUpdPartMetadata(ia sys.ODCIIndexInfo, palist sys.ODCIPartInfoList, env sys.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexInsert(ia in sys.ODCIIndexInfo, ridlist in sys.ODCIRidList, newvallist in sys.ODCINumberList, env in SYS.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexDelete(ia SYS.ODCIIndexInfo, rid VARCHAR2, oldval number, env SYS.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexUpdate(ia SYS.ODCIIndexInfo, rid VARCHAR2, oldval number, newval number, env SYS.ODCIEnv) RETURN NUMBER,
STATIC FUNCTION ODCIIndexStart(sctx IN OUT index_methods, ia SYS.ODCIIndexInfo,
op SYS.ODCIPredInfo, qi sys.ODCIQueryInfo, strt number, stop number, cmpval number, env SYS.ODCIEnv) RETURN NUMBER,
MEMBER FUNCTION ODCIIndexFetch(self IN OUT index_methods, nrows NUMBER, rids OUT SYS.ODCIridlist, env SYS.ODCIEnv) RETURN NUMBER,
MEMBER FUNCTION ODCIIndexClose(self IN index_methods, env SYS.ODCIEnv) RETURN NUMBER
CREATE OR REPLACE TYPE BODY index_methods IS
STATIC FUNCTION ODCIGetInterfaces(ifclist OUT sys.ODCIObjectList) RETURN NUMBER IS
BEGIN
ifclist := sys.ODCIObjectList(sys.ODCIObject('SYS','ODCIINDEX2'));
RETURN ODCIConst.Success;
END ODCIGetInterfaces;
STATIC FUNCTION ODCIIndexCreate (ia sys.ODCIIndexInfo, parms VARCHAR2, env sys.ODCIEnv) RETURN NUMBER IS
BEGIN
RETURN ODCIConst.Success;
END ODCIIndexCreate;
STATIC FUNCTION ODCIIndexDrop(ia sys.ODCIIndexInfo, env sys.ODCIEnv) RETURN NUMBER IS
BEGIN
RETURN ODCIConst.Success;
END ODCIIndexDrop;
STATIC FUNCTION ODCIIndexAlter (
ia sys.ODCIIndexInfo,
parms IN OUT VARCHAR2,
altopt NUMBER,
env sys.ODCIEnv)
RETURN NUMBER IS
BEGIN
RETURN ODCIConst.Success;
END ODCIIndexAlter;
STATIC FUNCTION ODCIIndexUpdPartMetadata(
ia sys.ODCIIndexInfo,
palist sys.ODCIPartInfoList,
env sys.ODCIEnv)
RETURN NUMBER IS
BEGIN
RETURN ODCIConst.Success;
END ODCIIndexUpdPartMetadata;
STATIC FUNCTION ODCIIndexExchangePartition(
ia sys.ODCIIndexInfo,
ia1 sys.ODCIIndexInfo,
env sys.ODCIEnv)
RETURN NUMBER IS
BEGIN
RETURN ODCIConst.Success;
END ODCIIndexExchangePartition;
STATIC FUNCTION ODCIIndexInsert(
ia sys.ODCIIndexInfo,
ridlist sys.ODCIRidList,
newvallist sys.ODCINumberList,
env sys.ODCIEnv)
RETURN NUMBER IS
BEGIN
return ODCIConst.Success;
END;
STATIC FUNCTION ODCIIndexDelete(
ia SYS.ODCIIndexInfo,
rid VARCHAR2,
oldval number,
env SYS.ODCIEnv)
RETURN NUMBER IS
BEGIN
return ODCIConst.Success;
END;
STATIC FUNCTION ODCIIndexUpdate(
ia SYS.ODCIIndexInfo,
rid VARCHAR2,
oldval number,
newval number,
env SYS.ODCIEnv)
RETURN NUMBER AS
BEGIN
return ODCIConst.Success;
END;
STATIC FUNCTION ODCIIndexStart(
sctx IN OUT index_methods,
ia SYS.ODCIIndexInfo,
op SYS.ODCIPredInfo,
qi sys.ODCIQueryInfo,
strt number,
stop number,
cmpval number,
env SYS.ODCIEnv)
RETURN NUMBER AS
BEGIN
sctx := index_methods(1);
return ODCIConst.Success;
END;
MEMBER FUNCTION ODCIIndexFetch(
self IN OUT index_methods,
nrows NUMBER,
rids OUT SYS.ODCIridlist,
env SYS.ODCIEnv)
RETURN NUMBER AS
BEGIN
return ODCIConst.Success;
END;
MEMBER FUNCTION ODCIIndexClose(self IN index_methods, env SYS.ODCIEnv) RETURN NUMBER AS
BEGIN
return ODCIConst.Success;
END;
end;
Problem workaround:
--drop function test_eq_fun;
CREATE FUNCTION test_eq_fun(a number, b number) RETURN NUMBER AS
BEGIN
IF a = b then
RETURN 1;
ELSE
RETURN 0;
END IF;
END;
--drop operator test_eq;
CREATE OPERATOR test_eq
BINDING (number, number) RETURN NUMBER
USING test_eq_fun;
--drop indextype test_index_type;
CREATE INDEXTYPE test_index_type
FOR
test_eq(number, number)
USING index_methods
WITH ARRAY DML(number, sys.ODCINumberList)
WITH LOCAL RANGE PARTITION
WITH SYSTEM MANAGED STORAGE TABLES;
CREATE INDEXTYPE test_index_type
FOR
test_eq(number, number)
USING index_methods
WITH ARRAY DML
WITH LOCAL RANGE PARTITION
WITH SYSTEM MANAGED STORAGE TABLES;
--drop table test_table;
CREATE TABLE test_table (id NUMBER (19,0));
CREATE INDEX test_index ON test_table(id) INDEXTYPE IS test_index_type;
insert into test_table values (1);I get single for 1 row and batch for 2 or more rows in the following simplified simulation.
SCOTT@orcl12c> DESC SYS.ODCINUMBERLIST
SYS.ODCINUMBERLIST VARRAY(32767) OF NUMBER
SCOTT@orcl12c> CREATE OR REPLACE TYPE index_methods AS OBJECT
2 (
3 step number,
4 STATIC FUNCTION ODCIGetInterfaces(ifclist OUT SYS.ODCIObjectList) RETURN NUMBER,
5 STATIC FUNCTION ODCIIndexCreate (ia SYS.ODCIIndexInfo, parms VARCHAR2, env SYS.ODCIEnv) RETURN NUMBER,
6 STATIC FUNCTION ODCIIndexAlter (ia sys.ODCIIndexInfo, parms IN OUT VARCHAR2, altopt number, env sys.ODCIEnv) RETURN NUMBER,
7 STATIC FUNCTION ODCIIndexDrop(ia SYS.ODCIIndexInfo, env SYS.ODCIEnv) RETURN NUMBER,
8 STATIC FUNCTION ODCIIndexExchangePartition(ia SYS.ODCIIndexInfo, ia1 SYS.ODCIIndexInfo, env SYS.ODCIEnv) RETURN NUMBER,
9 STATIC FUNCTION ODCIIndexUpdPartMetadata(ia sys.ODCIIndexInfo, palist sys.ODCIPartInfoList, env sys.ODCIEnv) RETURN NUMBER,
10 STATIC FUNCTION ODCIIndexInsert(ia in sys.ODCIIndexInfo, rid in VARCHAR2, newval in NUMBER, env in SYS.ODCIEnv) RETURN NUMBER,
11 STATIC FUNCTION ODCIIndexInsert(ia in sys.ODCIIndexInfo, ridlist in sys.ODCIRidList, newvallist in your_type, env in SYS.ODCIEnv) RETURN NUMBER,
12 STATIC FUNCTION ODCIIndexDelete(ia SYS.ODCIIndexInfo, rid VARCHAR2, oldval number, env SYS.ODCIEnv) RETURN NUMBER,
13 STATIC FUNCTION ODCIIndexUpdate(ia SYS.ODCIIndexInfo, rid VARCHAR2, oldval number, newval number, env SYS.ODCIEnv) RETURN NUMBER,
14 STATIC FUNCTION ODCIIndexStart(sctx IN OUT index_methods, ia SYS.ODCIIndexInfo,
15 op SYS.ODCIPredInfo, qi sys.ODCIQueryInfo, strt number, stop number, cmpval number, env SYS.ODCIEnv) RETURN NUMBER,
16 MEMBER FUNCTION ODCIIndexFetch(self IN OUT index_methods, nrows NUMBER, rids OUT SYS.ODCIridlist, env SYS.ODCIEnv) RETURN NUMBER,
17 MEMBER FUNCTION ODCIIndexClose(self IN index_methods, env SYS.ODCIEnv) RETURN NUMBER
18 );
19 /
Type created.
SCOTT@orcl12c> CREATE OR REPLACE TYPE BODY index_methods IS
2 STATIC FUNCTION ODCIGetInterfaces(ifclist OUT sys.ODCIObjectList) RETURN NUMBER IS
3 BEGIN
4 ifclist := sys.ODCIObjectList(sys.ODCIObject('SYS','ODCIINDEX2'));
5 RETURN ODCIConst.Success;
6 END ODCIGetInterfaces;
7
8 STATIC FUNCTION ODCIIndexCreate (ia sys.ODCIIndexInfo, parms VARCHAR2, env sys.ODCIEnv) RETURN NUMBER IS
9 BEGIN
10 RETURN ODCIConst.Success;
11 END ODCIIndexCreate;
12
13 STATIC FUNCTION ODCIIndexDrop(ia sys.ODCIIndexInfo, env sys.ODCIEnv) RETURN NUMBER IS
14 BEGIN
15 RETURN ODCIConst.Success;
16 END ODCIIndexDrop;
17
18 STATIC FUNCTION ODCIIndexAlter (
19 ia sys.ODCIIndexInfo,
20 parms IN OUT VARCHAR2,
21 altopt NUMBER,
22 env sys.ODCIEnv)
23 RETURN NUMBER IS
24 BEGIN
25 RETURN ODCIConst.Success;
26 END ODCIIndexAlter;
27
28 STATIC FUNCTION ODCIIndexUpdPartMetadata(
29 ia sys.ODCIIndexInfo,
30 palist sys.ODCIPartInfoList,
31 env sys.ODCIEnv)
32 RETURN NUMBER IS
33 BEGIN
34 RETURN ODCIConst.Success;
35 END ODCIIndexUpdPartMetadata;
36
37 STATIC FUNCTION ODCIIndexExchangePartition(
38 ia sys.ODCIIndexInfo,
39 ia1 sys.ODCIIndexInfo,
40 env sys.ODCIEnv)
41 RETURN NUMBER IS
42 BEGIN
43 RETURN ODCIConst.Success;
44 END ODCIIndexExchangePartition;
45
46 STATIC FUNCTION ODCIIndexInsert(
47 ia sys.ODCIIndexInfo,
48 rid VARCHAR2,
49 newval NUMBER,
50 env sys.ODCIEnv)
51 RETURN NUMBER IS
52 BEGIN
53 dbms_output.put_line ('single');
54 return ODCIConst.Success;
55 END;
56
57 STATIC FUNCTION ODCIIndexInsert(
58 ia sys.ODCIIndexInfo,
59 ridlist sys.ODCIRidList,
60 newvallist your_type,
61 env sys.ODCIEnv)
62 RETURN NUMBER IS
63 BEGIN
64 dbms_output.put_line ('batch');
65 return ODCIConst.Success;
66 END;
67
68 STATIC FUNCTION ODCIIndexDelete(
69 ia SYS.ODCIIndexInfo,
70 rid VARCHAR2,
71 oldval number,
72 env SYS.ODCIEnv)
73 RETURN NUMBER IS
74 BEGIN
75 return ODCIConst.Success;
76 END;
77
78 STATIC FUNCTION ODCIIndexUpdate(
79 ia SYS.ODCIIndexInfo,
80 rid VARCHAR2,
81 oldval number,
82 newval number,
83 env SYS.ODCIEnv)
84 RETURN NUMBER AS
85 BEGIN
86 return ODCIConst.Success;
87 END;
88
89 STATIC FUNCTION ODCIIndexStart(
90 sctx IN OUT index_methods,
91 ia SYS.ODCIIndexInfo,
92 op SYS.ODCIPredInfo,
93 qi sys.ODCIQueryInfo,
94 strt number,
95 stop number,
96 cmpval number,
97 env SYS.ODCIEnv)
98 RETURN NUMBER AS
99 BEGIN
100 sctx := index_methods(1);
101 return ODCIConst.Success;
102 END;
103
104 MEMBER FUNCTION ODCIIndexFetch(
105 self IN OUT index_methods,
106 nrows NUMBER,
107 rids OUT SYS.ODCIridlist,
108 env SYS.ODCIEnv)
109 RETURN NUMBER AS
110 BEGIN
111 return ODCIConst.Success;
112 END;
113
114 MEMBER FUNCTION ODCIIndexClose(self IN index_methods, env SYS.ODCIEnv) RETURN NUMBER AS
115 BEGIN
116 return ODCIConst.Success;
117 END;
118 end;
119 /
Type body created.
SCOTT@orcl12c> CREATE FUNCTION test_eq_fun(a number, b number) RETURN NUMBER AS
2 BEGIN
3 IF a = b then
4 RETURN 1;
5 ELSE
6 RETURN 0;
7 END IF;
8 END;
9 /
Function created.
SCOTT@orcl12c> CREATE OPERATOR test_eq
2 BINDING (number, number) RETURN NUMBER
3 USING test_eq_fun
4 /
Operator created.
SCOTT@orcl12c> CREATE INDEXTYPE test_index_type
2 FOR
3 test_eq(number, number)
4 USING index_methods
5 WITH ARRAY DML(number, your_type)
6 WITH LOCAL RANGE PARTITION
7 WITH SYSTEM MANAGED STORAGE TABLES
8 /
Indextype created.
SCOTT@orcl12c> CREATE TABLE test_table (id NUMBER (19,0))
2 /
Table created.
SCOTT@orcl12c> CREATE INDEX test_index ON test_table(id) INDEXTYPE IS test_index_type
2 /
Index created.
SCOTT@orcl12c> insert into test_table values (1)
2 /
single
1 row created.
SCOTT@orcl12c> insert into test_table
2 select 2 from dual union all
3 select 3 from dual
4 /
batch
2 rows created.
SCOTT@orcl12c> insert into test_table select deptno from dept
2 /
batch
4 rows created.
SCOTT@orcl12c> insert into test_table select object_id from user_objects
2 /
batch
34 rows created.
SCOTT@orcl12c> -
JNI: experience in creating DLLs with G++ (mingw32)?
Hello.
I'm trying to create a DLL:
--------------/HelloWorld.cpp/------
#include <jni.h>
#include "HelloWorld.h"
#include <stdio.h>
JNIEXPORT void JNICALL
Java_HelloWorld_displayMessage(JNIEnv *env, jobject obj)
printf("Hello world!\n");
return;
I previously created 'HelloWorld.java'
class HelloWorld
public native void displayMessage();
static
System.loadLibrary("HelloWorldImp");
I created 'HelloWorld.class'.
I created the header file 'HelloWorld.h':
c:> javah -jni HelloWorld
But I do not have any idea to create the DLL.
I tried with:
c:> g++ -I"D:\j2sdk\include" -I"D:\j2sdk\include\win32" HelloWorld.cpp -shared -o HelloWorldImp.dll
But I get this error message when calling from 'Main.java':
Exception in thread "main" java.lang.UnsatisfiedLinkError: displayMessage
at HelloWorld.displayMessage(Native Method)
at Main.main(Main.java:6)
In order to get this message I created 'Main.java':
class Main
public static void main(String[] args)
HelloWorld hello = new HelloWorld();
hello.displayMessage();
Does anybody have any experience in creating DLLs with G++???
Thank you very much.Or is it better GCC?
-
Create View with Force and No Force
Can Anyone Tell me how to create view with force and no force i have very little idea about this
This is the syntax.
CREATE [OR REPLACE] FORCE VIEW view
[(alias[, alias]...)]
AS subquery
[WITH CHECK OPTION [CONSTRAINT constraint]]
[WITH READ ONLY [CONSTRAINT constraint]];You can see interesting threads about this topic here.
Re: Creating view forcibly
Creating View forcefully
Cheers
Sarma. -
Create Window with Textbox and Button For getting Input Value
Hi All,
I have create plugin application but i want to take input from user. Therefore i want to create window with textbox and button.
please may i get solution...Or if that's all you need to do, just use JavaScript or a form.
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Can anyone recommend an alternative software programme to Pages? I have an OS X 10.7.5 macbook pro, so I am unable to get it. I want a programme that I can create docs with pictures and text on, invitations, posters etc. Many thanks in advance…..
LibreOffice
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I am creating webpages with frontpage and trying to make collapsible lists. The lists collapse and work correctly in "preview" mode, but do not work when accessed through firefox or explorer 8. Does anyone know what I am doing wrong?
Welcome to the 'wonderful' world of HTML5 e-learning.
In my view, from the issues I am seeing everywhere, HTML5 output from rapid e-learning tools such as Captivate is not ready for the kind of mobile device e-learning you want to develop.
Sorry to be pessimistic, but you may need to consider going back to the drawing board and coding it from the ground up. -
Creating dll in c++ and using labview to call it
Greetings All,
I have created a .dll file in visual C++ 2005 Express... I have attached both the c file and header file I used to create this dll in the .txt files cfile and header file. I have also included the .dll file itself so that you can use the vi. Please let me know if you have problems using it after you have configured the dll to go to the path you store and call the function ReturnMaxVal. The problem is the max value keeps giving me a rediculous number. I did this with a 1-D array and it was no problem. If anyone can help it would be much appreciated.
Thanks,
Clint
Attachments:
helpPlease!.zip 14 KBOK, here's a one way to do it. This is the C way, using malloc() to reserve memory.
There's propably a more C++ way to do this, using new and delete, but this works,
although I don't guarantee that it doesn't have memory leaks
This will initialize a 2D int array, but you should get the hang of things with this
example.
#include <iostream>
using namespace std;
int **a = NULL;
void f2(int rows, int cols)
// create array
a = (int **)malloc(rows * sizeof(int *));
for(int i = 0 ; i < rows ; i++)
a[i] = (int *)malloc(cols * sizeof(int));
// init values
for(int i = 0 ; i < rows ; i++)
for(int j = 0 ; j < cols ; j++)
a[i][j] = i+j;
cout << a[i][j];
cout << endl;
int main(void)
int rows = 0;
int cols = 0;
cout << "Enter number of rows: ";
cin >> rows;
//cout << endl;
cout << "Enter number of colums: ";
cin >> cols;
//cout << endl;
f2(rows, cols);
// free reserved memory
for(int i = 0 ; i < rows ; i++)
free(a[i]);
free(a);
a = NULL;
return 0;
Hopefully this helps. You can try to google for other possibilities, there seems
to be a lot of forum post about this matter. -
How to create a grid with arrays and booleans?
As part of a bigger project, I'm trying to create a sub-VI which will allow me to move a "cursor" in a 3x3 array.
There should be 2 boolean inputs, one for moving down in the array, and the other for moving to the right. Once the edge of the array has been reached, the "cursor" will start back from the beginning.
I have a vague idea of a 2 dimensional array with LED's. Once "down" has been pressed, the LED corresponding to (0,0) will turn off, turning (0,1) on. Same goes for the "right" button. When "down" is pressed at (0,2), the LED should turn off, and LED (0,0) should turn on.
I'm sure it has something to do with initializing arrays, but i can't seem to find the right way to do it.
Any kind of assistance is much appreciated. Thanks!
Solved!
Go to Solution.Maybe this will help.
Oh, I just noticed that I could have done the "Clear True" outside of the inner case structure and some other things too, but oh well - it works.
Help the forum when you get help. Click the "Solution?" icon on the reply that answers your
question. Give "Kudos" to replies that help.
Attachments:
grid_png.vi 14 KB -
Newbie - help needed with array and dictionary objects
Hi all
Please see the code below. I've posted this code in another thread however the original issue was resolved and this is now a new issue I'm having although centered around the same code.
The issue is that I'm populating an array with dictionary objects. each dictionary object has a key and it's value is another array of custom objects.
I've found that the code runs without error and I end up with my array as I'm expecting however all of the dictionary objects are the same.
I assume it's something to do with pointers and/or re-using the same objects but i'm new to obj-c and pointers so i am a bit lost.
Any help again is very much appreciated.
// Open the database connection and retrieve minimal information for all objects.
- (void)initializeDatabase {
NSMutableArray *authorArray = [[NSMutableArray alloc] init];
self.authors = authorArray;
[authorArray release];
// The database is stored in the application bundle.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"books.sql"];
// Open the database. The database was prepared outside the application.
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) {
// Get the primary key for all books.
const char *sql = "SELECT id, author FROM author";
sqlite3_stmt *statement;
// Preparing a statement compiles the SQL query into a byte-code program in the SQLite library.
// The third parameter is either the length of the SQL string or -1 to read up to the first null terminator.
if (sqlite3preparev2(database, sql, -1, &statement, NULL) == SQLITE_OK) {
// We "step" through the results - once for each row.
// We start with Letter A...we're building an A - Z grouping
NSString *letter = @"A";
NSMutableArray *tempauthors = [[NSMutableArray alloc] init];
while (sqlite3_step(statement) == SQLITE_ROW) {
author *author = [[author alloc] init];
author.primaryKey = sqlite3columnint(statement, 0);
author.title = [NSString stringWithUTF8String:(char *)sqlite3columntext(statement, 0)];
// FOLLOWING WAS LEFT OVER FROM ORIGINAL COMMENTS IN SQLBooks example....
// We avoid the alloc-init-autorelease pattern here because we are in a tight loop and
// autorelease is slightly more expensive than release. This design choice has nothing to do with
// actual memory management - at the end of this block of code, all the book objects allocated
// here will be in memory regardless of whether we use autorelease or release, because they are
// retained by the books array.
// if the author starts with the Letter we currently have, add it to the temp array
if ([[author.title substringToIndex:1] compare:letter] == NSOrderedSame){
[tempauthors addObject:author];
} // if this is different letter, then we need to deal with that too...
else {
// create a dictionary to store the current tempauthors array in...
NSDictionary *tempDictionary = [NSDictionary dictionaryWithObject:tempauthors forKey:@"authors"];
// add the dictionary to our appDelegate-level array
[authors addObject:tempDictionary];
// now prepare for the next loop...
// set the new letter...
letter = [author.title substringToIndex:1];
// remove all of the previous authors so we don't duplicate...
[tempauthors removeAllObjects];
// add the current author as this was the one that didn't match the Letter and so
// never went into the previous array...
[tempauthors addObject:author];
// release ready for the next loop...
[author release];
// clear up the remaining authors that weren't picked up and saved in the "else" statement above...
if (tempauthors.count > 0){
NSDictionary *tempDictionary = [NSDictionary dictionaryWithObject:tempauthors forKey:@"authors"];
[authors addObject:tempDictionary];
else {
printf("Failed preparing statement %s
", sqlite3_errmsg(database));
// "Finalize" the statement - releases the resources associated with the statement.
sqlite3_finalize(statement);
} else {
// Even though the open failed, call close to properly clean up resources.
sqlite3_close(database);
NSAssert1(0, @"Failed to open database with message '%s'.", sqlite3_errmsg(database));
// Additional error handling, as appropriate...
Message was edited by: dotnetterOk, so I know what the issue is now...I just don't know enough to be able to resolve it!
it's the tempAuthors objects.
It's an NSMutableArray which is create on the line before the start of the WHILE loop.
Having looked through the debugger, I can see that each dictionary object is created (with different codes which I assume are memory addresses) so all is well there. However, on each iteration of the loop in the middle there is an IF...ELSE... statement which in the ELSE section is clearing all objects from the tempAuthors array and beginning to repopulate it again.
Looking at the containing dictionary objects in the debugger I can see that the tempAuthors object that each contains has the same code (again, I'm assuming this is a memory address) - so if I understand correctly, it's the same object...I assumed that when I created the dictionary using the dictionWithObject call that I would be passing in a copy of the object, but it's referencing back to the object which I then go on to change.
Assuming the above is correct, I've tried several "stabs in the dark" at fixing it.
I've tried relasing the tempAuthors object within the ELSE and initialising it again via an alloc...init - but this didn't work and again looking through the debugger it looks as though it was confused as to which object it was supposed to be using on the following iteration of the WHILE loop (it tried to access the released object).
Having read a little more about memory management can someone tell me if I'm correct in saying that the above is because the tempAuthors object is declare outside the scope of the WHILE loop yet I then try to re-instantiate it within the loop (does that make sense???).
Sorry for the long post...the more I can understand the process the less I can hopefully stop relying on others for help so much.
I am continuing to read up on memory management etc but just not there yet.
Regards
Wayne -
Help creating .dll with c using JNI
Hi. I have created a JNI application that uses C to call Java. Now, I am trying to create the .dll for windows. I am using VS C++ compiler. My program compiles; however, it doesn't seem to start the JVM. I am not sure how to pass the arguments in VS C++ while builiding and running. Please let me know. Thanks.
Hey,
Thanks. I apologize for not being clear. I have created the dll file and an application that links to that dll and executes the code. It creates the .exe file and when I execute it, it goes through the sample() function that just prints "Hello", and then it goes through the startJVM() function where the JVM is intended to start; however, the status of JVM is returning -1. It's not able to start JVM. I have included the path for the jvm.dll and jvm.lib. But, still won't work. Please reply with suggestions/comments. Thanks again. -
Encrypt sensitive with password and calling sub pkgs
Hi we run 2012 enterprise and r introducing a db2 connection that "allows saving password".
We run from the file system (not the catalog) and face a challenge.
The default prot level on the SUB PACKAGE that has the db2 connection (only such connection right now) prevents our prod credentials from making the connection because its a different user than the one that created the sub pkg.
Encrypt sensitive with password seems a more strategic alternative but I dont know if the param (I think its called "decrypt") on the dtexec command line that allows passing a password at run time applies to just the parent pkg or all subs also.
I dont want to delay validation. I wouldnt even mind changing the xml connection string (by entering pswd in whatever syntax is necessary) using notepad but dont know what issues that will cause.
I wouldnt mind having someone logon and "re" save the pkg using the credentials of our prod userid and choosing the default prot level instead.
I also wonder if none of the other pkgs (including master) dont have any sensitive data, can their prot level defaults be left alone?
Can the community comment?If you are having sensitive info (passwords for conn strings etc) in our packages, the best way is to change the protection level to "encrypt sensitive with password" and then provide the password.
When we schedule a job or exec the parent package, the child packages are called automatically.
Thanks, hsbal -
Creating Dll with Vision Library
Greetings Board Members,
I have a small Application For which i want to make a shared DLL and test them before deploying at other co worker computer, The application uses the Labview Vision, The DLL are made by Building the DLL.
When I use the same dll and call them with labview i get an error code while the VI Modules with which DLL are made are used instead of DLL they are running OK. Can some one throw light on this issue and how it can be solved. The application is simple, Initialze USB Grabber, Snap and save image, Close Grabber. I am getting Error code in snap and save image.
Regards
Harjeet1.What is the error number or describtion you get?
2.Do you know that you will need to have a vision runtime license ($) at the other computers where you want to run the dll?
Christian -
Access ni4882.dll with Qt and MinGW
I have to control some electric loads and power supplies over GPIB. We use Qt 4.7.4 with MinGW 4.4 (32-bit) on Windows 7 64-bit.
The packet NI-488.2 GPIB Drivers packet 3.0.2 for Windows 7 64-bit is installed. The GPIB Troubleshooting Utility tool shows "pass" and the Measurement & Automation application can connect to the board and talk to an intrument. So far so good.
Now I want to write an application to use the NI4882.dll (3.0.0.49153). Unfortunately, there are just object files for Microsoft and Borland compilers and no lib file.
So we generate a def file from the ni4882.dll with:
pexports -h ni4882.h ni4882.dll > ni4882.def
-ni4882.def-
LIBRARY NI4882.dll
EXPORTS
?compareVersion@nGPIBAPI_NI4882@@YGXABVtSSVersion@@0AAJPBD@Z
?getCurrentVersion@nGPIBAPI_NI4882@@YG?AVtSSVersion@@AAJ@Z
?getOldestCompatibleVersion@nGPIBAPI_NI4882@@YG?AVtSSVersion@@AAJ@Z
AllSpoll@12
DevClear@8
DevClearList@8
Then generate the lib with:
dlltool -k -D ni4882.dll -d ni4882.def -l libni4882.a
Now, I've build a small test program in Qt.
-.pro file-
INCLUDEPATH += $$PWD/include
LIBS += $$PWD/lib/libni4882.a
-.cpp file-
#include "ni4882.h"
void MainWindow::Init()
int dd = idev(0,3,0,T10s,1,0);
if(Ibsta()&ERR)
Err(tr("Unable to open board:ibdev=%1").arg(dd));
if( ibonl(0,0)&ERR)
Err(tr("Unable to close board"));
void MainWindow::Err(QString message)
switch(Iberr())
case 0:
message.append("(EDVR - System error)");
} break;
qDebug("Error : %s\nibsta = 0x%x iberr = %d\n",
(unsigned int)Ibsta(), (int)Iberr());
The source code will be compiled and linked without an error.
But if I run it, the output is:
Error : Unable to open board: ibdev=32768 (EDVR - System error)
ibsta = 0x8000 iberr = 0
Error : Unable to close board (EDVR - System error)
ibsta = 0x8000 iberr = 0
So, the question is: What is wrong? Why do I always receive this EDVR error. I also tried SendIFC(0) with the same result.
With the GPIB Interactive Control tool, I can communicate with my instrument and the NI I/O Trace logs it. But I can't see logs in the Trace tool from my application. Is this an indication?
Any ideas?
Marko
Solved!
Go to Solution.Hi to all,
after some questions about using the GPIB library with Qt, I've written a step by step description to create object files for MinGW:
1. Create a folder and copy the "gpib-32.dll" from the "C:\Windows\System32" ("C:\Windows\SysWOW64" in Win7) to this folder.
2. Copy "ni488.h" from "c:\Program Files (x86)\National Instruments\Shared\ExternalCompilerSupport\C\include\". (Not ni4882.h!)
3. Load PExports (my version is 0.44) and put the exe in your folder to. I do not have a URL to load this tool but should be easy to find. It's freeware.
4. Copy dlltool.exe from "c:\QtSDK\mingw\bin\" to your folder.
5. Create a batch file "1 - build def file.bat" with the content: "pexports -h ni488.h gpib-32.dll > gpib.def"
6. Create a batch file "2 - build lib file.bat" with the content: "dlltool -k -D gpib-32.dll -d gpib.def -l libgpib.a"
7. Start the batch file "1 - build def file.bat" to create the def file "gpib.def"
8. Start the batch file "2 - build lib file.bat" to create the library file "libgpib.a"
9. Copy "gpib-32.dll" and "libgpib.a" to your software project. I created the subfolder "lib" and copied the files into.
10. Copy "ni488.h" to your software project. I created the subfolder "include" and copied the file into.
11. Into your PRO file type:
# Include the NI 488.2 library
INCLUDEPATH += $$PWD/include
HEADERS += include/ni488.h
LIBS += $$PWD/lib/libgpib.a
12. In your source code type:
#include "windows.h"
#include "ni488.h"
bool InitializeGPIBBoard( )
bool isStarting = false;
int boardID; /** @brief Board id. */
QString boardName; /** @brief Board name. */
int boardDescr; /** @brief Board descriptor. */
// Get board ID
SendIFC(boardID);
if( ThreadIbsta() & ERR )
ErrorHandling(tr("Unable to open board"));
return isStarting;
// Open and initialize a board or a user-configured device descriptor
wchar_t *aName = new wchar_t[boardName.size()+1];
m_para.boardName.toWCharArray( aName );
aName[boardName.size()] = 0;
m_para.boardDescr = ibfind( aName );
delete []aName;
// The board is the System Controller.
if( ibconfig( boardDescr, IbcSC, 1 ) & ERR )
ErrorHandling(tr("Unable to set the board to System Controller"));
return isStarting;
// Assert interface clear.
if( ibsic( boardDescr ) & ERR )
ErrorHandling(tr("Assert interface clear"));
return isStarting;
// aso.
isStarted = true;
return isStarted;
13. Be happy! :-)
I hope that helps. If you have problems, please write me a message or post on this board thread.
Gruß und viel Erfolg!
Marko
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