Calling external (DLL) functions

Hi everybody!
I know this might be a special question, but i didnt find any
solutions (whycih i could understand) to my problem:
Is there any way to call functions from a (in C++ written)
DLL, or any other way to get access to C++ functions?
This would really help me, because i'd like to use Flash to
create desktop applications, and use C++ for system integration.
All sujestions are welcome!

The third party tools "wrap" or 'host' the activex control
and provide an extended api - think of them as a much enhanced
version of the standard flash projector, which is pretty limited. I
just know what's possible I can't speak from experience - but I
know others here on the forums have used them.
There is an open source type of implementation called haxe or
screenweaver.. or something like that... but I don't know if it
will do what you want.
I know Zinc will because I did a quick search and it said so
- so I guess it should! Other names that spring to mind are Jugglor
and Swf Studio. I haven't checked these out to see if they can use
external libraries.

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FRM-40734 when calling external DLL Function from Forms 6

Even though some answers were given to my previous help request ("Again: Forms 6 and user-defined data types") I wasn't able to solve the problem of passing a parameter of an user-defined type to an external DLL function residing in the SECURSIGN.DLL library (the closest solution was to declare that "composite" parameter using the ROWTYPE clause referencing a custom-made table created just for the sake of defining that perticular datatype).
So I concentrated on SECURSIGN.DLL functions using more trivial data types, like a function requiring just four character strings as parameters.
I generated the necessary PL/SQL support using the FFI.
I discovered that also the simplest calls to external functions fail at runtime with the generic error FRM-40734.
I located the error: it happens just at the moment of calling the function from within the FFI-generated package body. Before that, the DLL is loaded with no problem, the function is correctly registered, and a function handle is regularly returned.
As long as I can regularly issue the very same call with the very same parameters from Visual Basic, I can't understand what's going wrong (ALL the needed DLL are in the same directory as the FMB/FMX forms).
I will greatly appreciate any help that You may be able to provide.

I have noticed just now that a dump file having a name like ifrun60_dump_299, is generated by FORMS every time I issue the aborted call to the foreign function.
Inside the form dump file, apart from useless info like Registers and so on, the message:
"Could not find Module32First"
By a FILE/FIND/CONTAINING TEXT I searched all the DLLs, and I noticed that Module32First is a routine that can be found within each of the following DLLs:
Cl32
d2kwut32
d2kwut60
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Error when calling external DLL function.

When calling a function in Oracle, the error happens
ORA-28575: '... error RPC connection to external procedures'
code:
create or replace library LibFunctions as 'c:\MyDLL.dll';
grant all PRIVILEGES on LibFunctions to public;
create or replace
FUNCTION Max(num1 in number, num2 in number) RETURN number IS
EXTERNAL LIBRARY LibFunctions
NAME "Max"
LANGUAGE C;
grant all PRIVILEGES on Max to public;
obs. Dll was created in Pascal.
What can this error?
tks,
Mauricio
Edited by: user13794390 on 19/01/2011 06:29

It's been a while since I used extproc. Anyway, it listener.ora make sure extproc is added. I'll assume you are on Unix:
(SID_DESC =
(SID_NAME = PLSExtProc)
(ENVS = "EXTPROC_DLLS=ANY,LD_LIBRARY_PATH=proper-directory-list")
(ORACLE_HOME = path-to-oracle-home)
(PROGRAM = extproc)
) SY.

External call to DLL function

Hi Experts,
can anyone tell me the best way to call a dll function from within ABAP?
Thanks,
Jennifer

Hi, I don't have any experience in calling DLLs, but you may want to give this a try.
report zrich_0001.
data: path type string.
path = 'C:WINDOWS<the_file_Name>.dll'.
call method cl_gui_frontend_services=>execute
   exporting
     application            = path
exceptions
    cntl_error             = 1
    error_no_gui           = 2
    bad_parameter          = 3
    file_not_found         = 4
    path_not_found         = 5
    file_extension_unknown = 6
    error_execute_failed   = 7
    others                 = 8.
Regards
Rich Heilman

Calling CVI DLL Function from Visual Studio

HI all ,
Iv'e created a DLL using CVI and i'm tring to call one of it's function from visual studio 6.0
I'm getting a general error , is there a specific prototype that i need to set my functions in ordrer to call them ?!
Kobi Kalif
Software Engineer

You will need to distribute the CVI RTE along with your DLL, since anything you write in CVI is going to use the RTE.
As far as calling the DLL functions, you can use the CVI defined macros
<return type> DLLEXPORT DLLSTDCALL <function name> (<param1 type> <param1> ...) {
to declare your functions in the DLL for access by a VS application.
for example
int DLLEXPORT DLLSTDCALL myfunction (int funparam1, double func param2) {
There are options for identifying which functions to export from your DLL, I use "functions marked for export" but there are other choices available. I also include a type library so when you type the name of a DLL funciton in VS6 you see a balloon popup with the function signature. This is a check box in the target settings. You have to create a ".fp" file (function panel file) to collect the function info for the library.
From VB6 you can access the DLL a couple of ways, but I usually add the DLL as a reference.

Call External C++ function and pass XML

Hi,
I need to call external C++ function from Oracle and pass to it XML file from Oracle table? Can you give short guide how to do it?
Regards

Your question sounds like is about using an Oracle database (or other application), and not about C++ programming or the using the C++ compiler. You are more likely to find a helpful answer in an Oracle database (or other application) forum.

Can Ora_ffi call ActiveX DLL function???

Hi, Can I call an ActiveX DLL function using ora_ffi or by any other means? Ora_ffi documentation says that it can call C dll functions.Can I call VB dll functions from forms PL/SQL.

Hi, I don't have any experience in calling DLLs, but you may want to give this a try.
report zrich_0001.
data: path type string.
path = 'C:WINDOWS<the_file_Name>.dll'.
call method cl_gui_frontend_services=>execute
   exporting
     application            = path
exceptions
    cntl_error             = 1
    error_no_gui           = 2
    bad_parameter          = 3
    file_not_found         = 4
    path_not_found         = 5
    file_extension_unknown = 6
    error_execute_failed   = 7
    others                 = 8.
Regards
Rich Heilman

Calling external C-functions in DLLs with struct as parameters

Hi all PL/SQL Gurus !
Is it possible to call external functions in a DLL written in C
wich has pointers to C-structs as parameter. Can you point me to
an example or extended documentation about this. I had a look at
the Oracle doc's but found no examples about structs.
Thank you very much,
Stefan.
P.S.: Konfiguration: Oracle 8.1.7.0.0 Client and Server on W2K-
SP2 machines.

Hi,
I have the same problem with you.Now,have you resolve the problem?
I want to know how to do.if you resolve it ,could you give me a example.
thanks .
best regards!
Liyf

Error when calling a DLL function

Hi,
I am using external C++ code with labView. One of the DLL functions I use serves to call files. The directory and the name of the file is is passed as a parameter for this function. When the VI is running and arrives at this function (I use the Calling Library Function Node tool), the following message is displayed:
ERREUR de type class boost::filesystem::filesystem_error.
boost::filesystem:ath: invalid name "D:\Documents Johan\Johan\Stitching\Fichiers de mesure\front parfait\13z2" in path: "D:\Documents Johan\Johan\Stitching\Fichiers de mesure\front parfait\13z2"
I do not know why this message is sent to me.
Thanks for your answer
JF

Hello,
How are you passing the file path to the DLL -- are you passing it as a
string? If you are passing at as a string, I would do some basic
console output to make sure that your DLL is receiving the file path
corectly as a string and perform your appropriate C++ function in your
DLL. If the error is occuring with passing the file path you
might want to check out the links below for a little more information
on this.
http://zone.ni.com/devzone/conceptd.nsf/webmain/7d6a20fe02edbf318625690700704cf3#4
http://digital.ni.com/public.nsf/websearch/4E9234BA4C7C4ABE86256E3C0074760F?OpenDocument
http://digital.ni.com/public.nsf/websearch/3B994675B17C654A86256FDD00754DD2?OpenDocument
Hope this helps,
Travis M
NI
Travis M
LabVIEW R&D
National Instruments

Calling external dll from oracle 8i pl/sql

Hi
I am facing in calling extrenal dll from pl/sql.
Steps followed by me are
1.
create library crc_lib as
'D:\ORACLE\ORA81\RDBMS\EXTPROC\EXTPROC\my.DLL';
2.
CREATE OR REPLACE FUNCTION check_file_crc (f1 char)
RETURN BOOLEAN AS
EXTERNAL LIBRARY CRC_LIB
NAME "Check_File_CRC"
LANGUAGE C;
3. CREATE OR REPLACE PROCEDURE CRC_TEST (f1 varchar2) AS
     RetValue varchar2(100);
BEGIN
     if check_file_crc(f1) then
          RetValue := '0';
     else
          RetValue := '1';
     end if;
     DBMS_OUTPUT.PUT_LINE(RetValue);
EXCEPTION
     when others then
     DBMS_OUTPUT.PUT_LINE(sqlerrm|| 'I am in exception');
END;
4.ET SERVEROUTPUT ON
SQL> exec crc_test('C:\file.txt');
ORA-28576: lost RPC connection to external procedure agent
I am in exception
I have tsnames.ora as
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
and listner.ora as
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = D:\Oracle\ora81)
(PROGRAM = extproc)
I am unable to resolve problem please help.
Prashant
Edited by: prashant13 on Jul 23, 2009 11:27 AM

See if MOS note      468404.1 proves helpful here (though not meant for your version of Oracle).

Calling a dll function that as a structure

I'm trying to call the following function with the Call library function node:
XLstatus xlLinSetChannelParams (
XLportHandle portHandle,
XLaccess accessMask,
XLlinStatPar statPar)
The statPar parameter is a stucture which is define as follow
typedef struct {
unsigned int LINMode
int baud rate;
unsigned int LINVersion;
unsigned int reserved;
} XLlinStatPar;
I used a cluster to pass the data to the function but labview is crashing everytime. The C output of the CLFN is :
typedef struct {
unsigned long LinMode;
long baudrate;
unsigned long Linversion;
unsigned long reserved;
} TD1;
long _xlLinSetChannelParams28(long portHandle, uInt64 accessMask,
TD1 *statPar);
Why is labview sending a pointer to the struct instead of the structure itself? Is this the cause of my problem? Any Solution?

The CLFN ouput shown in my previous message was done with the "handle to value" parameter. As you stated, it sends a reference to the struct memory location.The problem is that i need to pass the structure value as an input and not a pointer to it (well, that's what i think the problem is). I read the various documents about CLFN and I tried the examples but they are all have function of that kind:
returnval ExampleFunc (structPointer *struct)
While the function in my dll is made like that
returnval ExampleFunc (structValue struct) (see the real function in my first message)
I included the dll and Vi and documentation for the xlLinSetChannelParams function. The CLFN node that calls it is the fourth one (the one with a cluster as input). The first 3 CLFN are used to call the initialization function:init driver,get channel and open port.
Attachments:
LIN test.zip ‏130 KB

Having problem with calling external javascript functions in LV

Hi,
I found this VI: http://lavag.org/topic/10304-discuss-calling-external-javascript/, which I believe can be really helpful for my work. The problem is I can't get it to run based on the following problem:
- Apparently the "ScriptControl" cannot be loaded
I am using LabView 8.6, and this vi has been produced in a 8.0 version. Do you think this is the problem? If not, what could cause this problem running this VI?
Thanks,
Diogo

Hi,
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<!DOCTYPE html "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Google Maps JavaScript API Example</title>
<script src="http://maps.google.com/maps?file=api&v=2&key=abcdefg&sensor=true_or_false"
type="text/javascript"></script>
<script type="text/javascript">
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var map = new GMap2(document.getElementById("map_canvas"));
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Wrapper for invoking external DLL-function

I want to run a Host-Command (e.g. rwrun60 report=xyz.rdf batch=yes) invoked by a trigger that fires when a new record is inserted.
I wrote a DLL which has an exported function that accepts a commandline (with parameters) and invokes the command via ShellExecute.
The problem is, that when i invoke the PL/SQL-wrapper, the DLL-function is properly run, but the program i want to run is only visible in the taskmanager(NT) and does nothing.
So what i need is a correct wrapper for the function:
DLL-function: OExecSysCmd(cmdLine *char)
Wrapper:
PROCEDURE OExecSysCmd(p_SysCmd in char)
IS EXTERNAL
NAME "OExecSysCmd"
LIBRARY demolib;
Thanks in advance
Dannys

Hi Russ,
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#include "LogDll.h"
Then I've tried to invoke a LogDll function (not within F_ApiInitialize (), but in a custom dialog box event):
int retval=LogDllFunction();
The code compiles, but if I start FM, I receive the message error. If I comment the line above, FM and my client start normally.
Thanks,
Stefano

Error while calling external library functions

Using visual studio I wrote the following code test javascript communication with external C/C++ libraries:
aabc.cpp :
extern "C" __declspec(dllexport) char* ESInitialize (TaggedData* argv, long argc);
extern "C" __declspec(dllexport) long ESGetVersion (void );
extern "C" __declspec(dllexport) void ESFreeMem (void* p);
extern "C" __declspec(dllexport) void ESTerminate (void );
extern "C" __declspec(dllexport) double AddNumbers(void);
double AddNumbers(double a, double b)
return a + b;
long ESGetVersion (void){
return 5;
And the code that I wrote in javascript is:
var obj = new ExternalObject("lib: aabc.dll");
alert(obj.version);
var aa = obj.AddNumbers(10, 20);
alert(aa);
It seems to me that it loaded successfully due to the output I am getting from the second statement. But I am getting error at the third statement where I called AddNumbers(10,20) function.
Somebody help me.
Thanks in advance,
sailu

I have the same problem. This is my code:
extern "C" __declspec(dllexport) char* ESInitialize (TaggedData* argv, long argc);
extern "C" __declspec(dllexport) long ESGetVersion (void );
extern "C" __declspec(dllexport) void ESFreeMem (void* p);
extern "C" __declspec(dllexport) void ESTerminate (void );
extern "C" __declspec(dllexport) int AddNumbers(int a, int b);
extern "C" __declspec(dllexport) char* ESInitialize (TaggedData* argv, long argc)
return "AddNumbers_dd";
int AddNumbers(int a, int b)
return a + b;
long ESGetVersion (void){
return 17;
And the code that I wrote in javascript is:
var obj = new ExternalObject("lib: mydll.dll");
var x = obj.AddNumbers(10, 20);
alert(x);
The version of the library is correct, but when I try to use the function "AddNumbers" I receive this error "AddNumbers is not function".
What would be the correct procedure to call a function inside a DLL?

How to call the DLL functions through Java

Hello,
I have already got a VC++ generated DLL. It has serveral functionalities. I need to call those functions from my Java Application. Now i know that it can be possible only through writing Java JNI Interfaces.
Everywhere i only see they give an example where in they tell to create an DLL. Now how do i will call if an DLL is ready and exists.
If anyone can give an example then it will be very helpful to me. Please mail me at [email protected] .
Thank you
vvpatro

You can't call functions in an arbitary DLL form Java. You need to use JNI to produce a 'wrapper' DLL that maps Java methods to the methods in the target DLL. The purpose of the wrapper is to allow type conversion between Java types and C/C++ types. The complexity of this task depends largely on the types used in th target DLL. If the targer DLL uses only primitive types such as char, byte, int, long, string, the translation is simple and the wrapper DLL will be 'thin'. If however, the target DLL passes arrays and objects, or employs callbacks, these more work to do, and the wrapper will be correspondingly 'thicker'.
Hope this helps.

Calling external (DLL) functions

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