Instrument Handle Out as Global variable
Hi,
How do i create "Instrument Handle Out" of an IVI function as a global variable.
Regards,
Siddu
I don't work with IVI, but this should work - Open the globals VI and add an IVI Logical Name control (I/O palette).
As a more generic solution, right click the output terminal and select Create>>Control. Find the control on the FP, copy it (ctrl+c) and paste it into your globals VI. In either case, it should now be a global variable.
You should take care when working with globals, because you can cause race conditions - for example, you probably have to open communication to your device and pass the value of the reference into the global before being able to use it. If you don't, you may start having problems, and it will be hard to locate them.
Try to take over the world!
Similar Messages
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Save in a variable an instrument handle out
Hello,
I wanna create a sequence in teststand using labview step. the problem is the VI of my labview step has a function with instrument handle in and instrument handle out. How can I store those instrument handle out in a variable to be able to use that variable as the input of an instrument handle in in another VI and if it's possible wich kind of variable should i use in both labView and teststand.
Thanks in advance for your answer
ChristelleYou can use the Session Manager. There's an example (in 3.1 anyway), in the SessionMgr\Lv\LVDMM.seq.
-
Global Variable declaration in Custom Infotype
Hi All,
I need to validate a custom infotype field, where i need to check for execution times. I need to override the field value only during first time of the run(PAI logic) and there after user can choose a value of his choice.
I was looking out for Global variable to check if its first run. Can you please tell me how do i create global variable in custom infotype? The top include specified in the program is not editable, being standard (MPH5ATOP).
Thanks,>
Sachidanand B wrote:
> Hi All,
>
> I need to validate a custom infotype field, where i need to check for execution times. I need to override the field value only during first time of the run(PAI logic) and there after user can choose a value of his choice.
> I was looking out for Global variable to check if its first run. Can you please tell me how do i create global variable in custom infotype? The top include specified in the program is not editable, being standard (MPH5ATOP).
>
> Thanks,
The system will generate an include with the naming convention ZP<Custom Infotype number>10(This program will be included in the custom infotype main program ZP<Customeinfty number>00). You can use this include for your data declarations.
Ex: if the number of the custom infotype is 9010 the generated include name will be ZP901010.
For more details check the link below
http://help.sap.com/saphelp_47x200/helpdata/en/4f/d525ad575e11d189270000e8322f96/content.htm
Regards
Rajesh: -
Global variable in Instrument Drivers
Hi,
We are designing an Instrument Driver for our devices. We do have VI's that does the same operation but with different Inputs and this Input is a cluster of references.
I would like to gain knowledge if all this VI's can be clubbed together by making those clusters as global variables. Through this way I hope we will significantly optimizie our code.
We are also looking for the drivers to get certified by the NI so looking for any sort of solution if making global won't be a good solution for achieving optimization.
Thanks In Advance,
VIvek
Solved!
Go to Solution.I don't quite understand what you mean by "clubbed together". Using global variables will not magically make your code more efficient. There's uses for global variable, and there are places where they should not be used. A reasonable use is to hold data used by muliple processes, though a queue is in most cases a better way to go.
The best way to see how to write an instrument driver is to download recent instrument drivers from the NI Instrument Driver Network. Look for the ones that are project-based as these are done in 8.x and are quite recent. Don't bother with the old drivers - they're a mess. You should be able to find something that's similar to your instrument and use it as a template. There's also an Instrument Driver Wizard that comes with LabVIEW. Another source of information is the NI Knowledge Base. Do a search, and you'll find lots of information. Like this: Developing LabVIEW Plug and Play Instrument Drivers.
You should also read over Ben's nugget on Action Engines. -
Hi
I have build an Labview project with FPGA target . I have configured an FPGA VI and an host Vi to acquire data and logged the data to a file and stored the latest data in a global variable simultanously. I have configured one more VI in the same project to access the global variable. I have build a dll to access both the VI as functions in LabWindows/CVI code. My task in CVI is to update configured GUI with latest data periodically and run the host VI continously for a long time and log the data to a file. GUI should update for every one second with latest data for this I am using the second VI in which I am accessing the global varibale in which the latest data has been stored in host VI.Duplicate Post (go here)
-
My goal is to break apart an entirely LabView created application so I can still use parts of it (builded as Shared DLLs upon on some VIs) in my new .Net application. My problem is that some others VIs (that I am not intending using) are changing those global variables (in the natural data flow of the application). I could , of course, send the values of those global variables as parameters, but I don't know how should I pass those data types (and their size)... There are some clusters there...
Any help is well appreciatedvulpe wrote:
My goal is to break apart an
entirely LabView created application so I can still use parts of it
(builded as Shared DLLs upon on some VIs) in my new .Net application.
My problem is that some others VIs (that I am not intending using) are
changing those global variables (in the natural data flow of the
application). I could , of course, send the values of those
global variables as parameters, but I don't know how should I pass
those data types (and their size)... There are some clusters there...
Any help is well appreciated
Your
problem is of course the use of globals. That is almost always a bad
idea and asking for troubles once your application gets bigger.
Avoiding race conditions and undesired influences between different
parts of your application will take up more and more of your
development time as your project grows.
You should look into Functional Globals (LV2 style globals) and shift
registers for data storage and queues for passing information between
different parts of your applciation. Using these techniques
consequently, will require you to spend some more time initially but
will allow you to grow your application without increasing the
complexity of managing such things exponentially.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions -
Storing DAQmx Task in a Functional Global variable
Happy New Year to everyone!
I got a nice little question hoping some of you might be able to help me....
After initializing an starting a DAQmx task (V7.5), I wanted to store the task out reference in a functional global variable, but it seems, it didn't work.
Everytime I tried to call a DAQmx VI with the opened reference, I get an error, the task would not be existing....
I already made a workaround, so everything works fine. I'm just curious what I made wrong....
Thanks in advance!
Cheers
Oli
Programming languages don't create bad code, programmers create bad code....Helo Oli,
Normally, you should not have a problem storing a task reference in a variable. However, the vi that created the task has to stay in memory for it to work. Closing the vi will result in the destruction of all created hadles -
that is why your reference might be regarded invalid if you use it in
another vi.
That is why I can just assume that you are closing the VI that created the task before you are using the handle somewhere else. You can use variables to store the task ID, but as a workaround you have to keep the vi which reated the reference running.
Hope this explains the behaviour.
Regards
Ingo Schumacher
Systems Engineer Sound&VibrationNational Instruments Germany -
How do you override global variable values when calling oraxsl or xsl.exe?
I am a newbie to oracle xslt.
I have down loaded the latest version of xdk (10.1.0.2...). (Jan 2, 2009).
In the past I haveI used micorsoft's "msxsl.exe" to perform my transformations.
I am looking for a more up-to-date transformation tool.
I found Oracle's version, and thought I would try it out.
I have run the "bin/xsl.exe -hh" command.
I read its help data. It states that variables are
passed by coding a pramater "-V <var> <value>".
I have also examined the oraxls.bat file.
I found the documentation on "oracle.xml.parser.v2.oraxsl" class.
It states that parameters are passed after the "-p" switch.
It says the value of the -p parameter is "a list of paramemters".
I don't find this sufficient information to be useful.
I can spend days guessing, and I might get lucky.
I thought it my be better to ask for help.
I need to pass in (override) values for 3 global variables.
I saw the method
"setParam(namespace, variable, value)",
near the documentation for the "oraxsl" class.
How do you format the options string to communicate more than one param statement?
(in either xsl.exe and/or oraxsl class).
Suppose I have an xslt stylesheet as follows:
==================================================
<?xml version="1.0" ?>
<xsl:stylesheet version="1.1" xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >
<xsl:param name='a' select='"default_a"' />
<xsl:param name='b' select='"default_b"' />
<xsl:param name='c' select="'default_c"' />
<xsl:template match='/'>
this is value for a: <xsl:value-of select='$a' />
this is value for b: <xsl:value-of select='$b' />
this is value for c: <xsl:value-of select=$c' />
<xsl:apply-templates />
</xsl:template>
</xsl:stylesheet>
========================================================
Now as part of the calling of the XSL processor I want to change the value of these
three global parameters.
I want:
a="current_a",
b="current_b",
and c="current_c"
How do I express this using xsl.exe and its paramter string (-V ????).
and/or how do I express it to the oraxsl class ( -p (xsl, a,"current_a"), (....) )???
The syntax for specifying this information is not very clear in either situation.
Of course I am making the "assumption" that by "param" they are
refering to "global parameters" (as in my stylesheet), rather than some other global parameters of XLST.
As an aside inquiry:
I had hopped that the Oracle's xsl Verion 2 routine could handle xslt 2.0 commands
such as "xsl:for-each-group", since it handled multiple xsl:outputs.
From reading some of the documentation it seems it only handles xslt 1.0 syntax/commands.
Is this true? (or is the documentation not up-to-date?).
Any help on passing param values to xsl.exe and/or "oraxsl" class is appreciated.
Thanks.Here is the line from one of my testing .bat files that passed in one parameter. I can't recall if I've passed in two, but this will give you a starting point for passing in multiple
java -cp %CPath% oracle.xml.parser.v2.oraxsl -p show_image='yes' %ValXML% %ValXSLT% As for XSLT 2.0 support, it appears it does per {thread:id=503445} -
Global variable in servlet & DBPooling questions
Hello guys,
I used to develop PHP/ASP, and am new to servlet. I have been searching around for a solution ...
With Php, we can get the reference of a global variable in any classes->functions...
How do I do this with servlet ?
And second..I have developed the DB class as below... I set the datasource to be static, so it initializes only once. Is it a good idea? How would you like to improve this class? any comments?
package shop.database;
import javax.sql.DataSource;
import java.sql.*;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.log4j.Logger;
import shop.admin.exception.GeneralException;
public class DdManager {
static protected Logger logger = Logger.getLogger(DdManager.class);
private String userName = "root";
private String password = "";
private String hostName = "jdbc:mysql://localhost:3306/shop";
private String database="shop";
static private DataSource ds; // set this to be static so all threads share the same job in JVM
private Statement stmt;
private Connection conn;
private ResultSet rs;
private CallableStatement cs;
public DdManager() {}
* setup the data source and return it
public static DataSource getDataSource(
String sDrvName,
String sUserName,
String sPwd,
String connectURI) {
BasicDataSource ds = new BasicDataSource();
ds.setDriverClassName( sDrvName );
ds.setUsername( sUserName );
ds.setPassword( sPwd );
ds.setUrl( connectURI );
ds.setMaxActive( 15 );
ds.setMaxIdle( 10 );
ds.setMaxWait( 10000 ); // 10 seconds
return ds;
* static init of the class
* this class is will be called only once to initialize the DataSource
static {
try {
Class.forName( "com.mysql.jdbc.Driver" );
ds = getDataSource( "com.mysql.jdbc.Driver",
"root",
"jdbc:mysql://localhost:3306/shop" );
if (ds == null) {
String msg = "Connection Pool error";
logger.error(msg);
throw new GeneralException(msg);
logger.info("DataSource has been initialized");
} catch(Exception exception) {
logger.error(exception.toString());
try {
throw new GeneralException(exception.toString());
} catch (GeneralException e) {
logger.error(e.toString());
* get the connection from the pool (DataSource)
public void openConnection() throws GeneralException {
try {
BasicDataSource bds = (BasicDataSource) ds;
logger.info("NumActive: " + bds.getNumActive() + ", " + "NumIdle: " + bds.getNumIdle());
conn = ds.getConnection();
logger.info("Connection of " + database + " has been established");
} catch(Exception exception) {
logger.error(exception.toString());
throw new GeneralException(exception.toString());
* close the connection will actually return the connection to the pool (Must)
public void closeConnection() throws GeneralException {
initResource();
try {
if (conn != null){
conn.close();
logger.info("Connection of " + database + " has been closed");
} catch(SQLException exception) {
logger.error(exception.toString());
throw new GeneralException(exception.toString());
* prepare the calling stmt
public void prepareProcedure(String callStatement) throws GeneralException {
initResource();
try {
cs = conn.prepareCall(callStatement);
} catch(SQLException exception) {
logger.error(exception.toString());
throw new GeneralException(exception.toString());
* set the pass-in parameter for "String"
public void setParameter(int position, String parameter) throws GeneralException {
try {
cs.setString(position, parameter);
} catch(Exception exception) {
logger.error(exception.toString());
throw new GeneralException(exception.toString());
* set the pass-in parameter for "Integer"
public void setParameter(int position, int parameter) throws GeneralException {
try {
cs.setInt(position, parameter);
} catch(Exception exception) {
logger.error(exception.toString());
throw new GeneralException(exception.toString());
* execute the procedure and return the resultset
public ResultSet execProcedure() throws GeneralException {
try {
rs = cs.executeQuery();
} catch(SQLException exception) {
logger.error(exception.toString());
throw new GeneralException(exception.toString());
return rs;
* close the statment and resultset
private void initResource() throws GeneralException {
try {
if(rs != null) {
rs.close();
if(stmt!= null) {
stmt.close();
logger.info("Statement & Resultset have been free");
} catch(Exception exception) {
logger.error(exception.toString());
throw new GeneralException(exception.toString());
Thanks mates!
myyThanks Saish,
Your response is really appreciated. Sorry about that
as i didnt know there is 'code' formatting button,
and I will look into the Singleton pattern.
As I'm still in the learning stage. Therefore, i
still have a lot of thing do not understand.
... use it in a method signature ...What is "a method signature" ?
A method signature is basically the method's parameters, return value, name and any access or other modifiers. The following is a method signature:
static final public void main(final String[] args)Between the braces of the method body is the implementation (or as I already alluded to, the method body).
Consider using an already-developed connection poolimplementation, such as Jakarta Commons DBCP ...
I'm trying to implement the Jakarta DBCP. Did I go
into the wrong way?
Sorry, did not read the imports. Yes, you are. However, I am confused about what you are trying to implement. You have a static method getDataSource(). You also have a static variable 'ds'. Use one or the other. I would be that there are seemingly random errors cropping up based on whether you remember to call getDataSource() or not.
You do not, generally, want the data source to be static. Multiple threads might use the class. And if there is only a static data source, you will either need to synchronize the methods that use the data source (resulting in a scaling bottleneck) or not synchronize them (which will totally destroy any concept of a logical unit of work or database transaction).
.. A static datasource, as in your class, can onlysafely be used by one thread at a time, potentially
introducing scaling bottlenecks (or race conditions)
in your system ...
So, you mean there is no need for the DataSource to
be static ?
No, in fact, IMO, it should not be. That is why you are pooling. Use instances. The pool will manage the connections and their availabilty for you.
Why are you throwing GeneralException everywhere?Here's a question: can someone using your class (a
caller) realistically be expected to handle a
database exception?
When there is a database error, I just want to stop
the process and redirect the user to an error page. I
will look into the unchecked exceptions. Thanks.
Unchecked exceptions do not need to be declared in a method signature or caught within the method body. Checked exceptions do. As such, an added benefit is that unchecked exceptions de-clutter your code.
In your initResources() method, what happens if theclose() on ResultSet throws an exception
Oh, yes. I'm so stupid.
Now I only have ...
private static DataSource ds; // set this to
be static so all threads share the same obj in JVM
private Connection conn;
private CallableStatement cs;
private void initResource() throws GeneralException
n {
try {
if(cs != null) {
cs.close();
logger.info("CallableStatement has been
as been free");
} catch(Exception exception) {
logger.error(exception.toString());
throw new
throw new GeneralException(exception.toString());
You still have issues.
public void initResources() {
if (rs != null) {
try { rs.close(); } catch (SQLException ignore) { ignore.printStackTrace(); }
if (stmt != null) {
try { stmt.close(); } catch (SQLException ignore) { ignore.printStackTrace(); }
}Normally, this type of method would not be called initResources() but rather closeResources() or freeResources(). It would be called from within the 'finally' block of another method using the CallableStatement or ResultSet.
This is really is problem, would you mind to tell me
how to handle this(close the connection) if the
close() on either CallableStatement or Resultset
throws an exception ?
See above. Simply log the exception (there is usually nothing meaningful you can do if a close() fails, and it is up to you as a developer if this is an error or just a warning). Another option is to 'chain' exceptions. In your own exception, add a method 'addException(Throwable)'. This would add another exception to a List of exceptions. When you print the stack trace, iterate through the chained exceptions to print them all out. One place where I find this useful is rollback() code. If the original SQL statement fails AND the rollback fails, I definitely want to see that rollback() exception as well in my logs.
The DB thing makes me headache. What I actually
wanted is a solution for:
Let say I have a class "HelloAction.class" contains
the code:
public ActionForward XXX() {
DbManager DB = new DBManager();
... do some DB thing here...
SecondClass SC = new SecondClass();
SC.doSomeOtherDbThing();
... do something else...
ThirdClass TC = new ThirdClass();
SC.doMoreOtherDbThing();
}There are some functions in SecondClass.class and
ThirdClass.class that will need database connection.
I consider 'global variable' is because I want these
two classes are able to use the same
connection(DbManager) from the function -
ActionForward XXX().
What is the best way to implement the above situation
(sharing the same connection in different classes &
sub-classes?
I also just realize that the problem of multi-threads
with these two class variables..
private Connection conn;
private CallableStatement cs;Really headache. I really appreciate any comments.
Thanks.
- myyPass the Connection or DataSource to each method or constructor. Call commit() or rollback() from the method that created the transaction.
- Saish -
Why do global variables have a .vi extension?
Hi,
While cleaning up some code the other day, it occured to me that although Virtual Instruments and Global Variables are distinct entities with separate roles in the LabVIEW environment, they share the same file extension .vi. It seems much more logical to assign a unique extension like we already do for controls, menus, classes, etc.
Can anyone explain why it's done this way?
Thanks!
Solved!
Go to Solution.No terminals on a global's BD. Just a blank slate. You CAN put stuff there but if there is any reference to a FP object LabVIEW will blow up on you so there is no real easy way to pass data in or out. (I once thought of embeding a counter into a global- It was not pretty)
Regardless, no matter what you COULD do, there must be another legitamate way to do the same thing. Its basically "Trickery or witchery." Do that kind of thing at your own risk! (Don't try this at home- We are professionals) Since you shouldn't be there, there are fewer protections. BAD things CAN and likely WILL happen. Think of it like triing to drive a car on two wheels. Its possible but, perhaps you want to try it with a really cheap car and know someone good with body repair.
Jeff -
Control references vs. global variables
I guess my question centers on the appropriate application of control references.
I am writing a complex program that has a state machine at the top level, and, for one frame of the state machine, a while loop containing a couple subVIs, each of which contains many subVIs. The lower-level subVIs are affected by buttons on the top-level VI. Information from the lower-level VIs must be shown on the top-level front panel within the loop. My question is: what is the best way to do this?
(I have a previous version of the program that I wrote that keeps just about everything on the top level so that I can update the front panel, but this is not at all modular.
In addition, I considered breaking things up into more than on
e front panel, but this doesn't seem to be a good option for this section of this program.)
Last week I read about control references, and decided that this could be the way to deal with this issue. I have not worked with them before, so I want to know: Are control references an appropriate solution for this issue? Is it good programming practice to use them, especially to update data on charts and graphs? How do they compare programming-wise and efficiency-wise to global variables?
Global variables are another solution, I think, but I would have way too many variables to update. I think the advantage with global variables is that one could just insert a global variable in a subVI and not have to wire it up through the different subVI levels, which one would have to do (I think) with control references.
Can you offer any advice?
Thanks!Paul,
The actual implementation of the solution is up to you. This is indeed a complex question.
I would offer the following advice:
On globals:
Try to avoid them. I try to restrict the use of globals to unidirectional. If you have ever dealt with a race condition, you will know why. Mistakes are often made with globals, and they are quite apt to become the biggest source of bugs in a program, especially in one as large and/or complex as your appears to be. If you must use globals, try using a shift register, or LabVIEW 2 style global instead. Basically, you use an unitialized shift register with two (or more) cases: Read and Write. This prevents race conditions, but only if the VI is non reentrant. However, implementation is still difficult.
Control References:
I also have read and heard about control references. I have had much use for them, for controlling the appearance of controls and indicators (and decoratiopns too, I guess...). However, I would caution you on using them to pass data around. This violates dataflow in a big way, as you are passing around pointers, instead of data. I believe this is difficult to implement, and even more difficult to keep straight. I personally recommend using them only for attributes of FP components, not for passing data.
So, what do I believe is the most elegant solution? I think a data server is your best bet. This is close to a LabVIEW 2 style global, but a little more active. Simply write all of your data into a subVI in any manner, a queue, a FIFO, LIFO, etc. Then, retrieve the data as desired. Buffering, queuing, etc are all handled by the data storage and retrieval subVI. It becomes sort of a small active database. The two sides (storage and retrieval) are independent of each other, and the code is all handled in the function. A basic version is a LIFO, Last In First Out, wherein the data is overwritten constantly. The data is then read by the reading VI, the front panel VI in your case, at any time, and the data is always the latest. You can add complexity as you need, such as making it a FIFO. This is done by simply writing the data to an array, then reading back the oldest value (by reversing the array and reading index 0.)
I believe this is an elegant solution to your problem. It does maintain dataflow, except that time is taken out of the equation, depending on how you look at it. It simplifies your program because you only need to do three things. Write the data handler, then drop in the function into the VI that writes, and the one that reads. It is also flexible in handling the data.
Good luck, and let us all know how you do. -
Find and replace global variables
Hi there,
I've ran into a mess with my global variables. While I was trying to rename one of the globals, all instances in hundreds of subvis turned corrupt. The icon of the global variable turned black and the wires starting at the variable became broken. The amazing thing is that the black icons seem still to be linked to the correct global variable. If I leave the mouse cursor on the icon, the correct file path appears in the context help window. If I double click on the corrupt icon, the correct vi is opened. I tried "Save as" and "Rename" with various options. LabVIEW seems to browse through all affected vis but the icons remain broken. My last hope was to run the "Find and replace" tool (Ctrl + F), but it doesn't work for global variables for some unknown reason, unfortunately. Compare
http://forums.ni.com/ni/board/message?board.id=170&message.id=438450&query.id=2151294
Is anybody out there who has a useful hint?
Peterstoeckel wrote:
Hi there,
thank you all for your contributions. We were able to solve the problem in the meanwhile. Why did nobody point us to the fact that the icons of global variables turn black if the name of the control on the panel of the variable does not match the selected name inside the icon?
The LabVIEW compiler would have told you that right away. If you click the broken run arrow on the situation you will get the message:
An item with the specified name could not be found. Select a different item from the list.
Seems pretty straightforward to me. But then, perhaps it's because I've been using LabVIEW for some time.
If somebody just quietly mentions the existence of "global variables" he or she will usually be soused with flout and bashed by the proven active veterans. But why's that? Global variables can provide an easy way to communicate a "stop" information throughout all running vis. As long as there is just one writer and many readers, there is no danger that it comes to "race conditions".
If global variables are really so nasty as is often said, why does National Instruments still provide them within LabVIEW??
I don't want to get into yet another global variable debate here. The only comment regarding global variables made in this thread was a tongue-in-cheek comment I made. I was not dissing global variable. In fact, I use them quite often. Global variables, like every other programming construct ever invented have their use. The main reason you will see the so called "proven active veterans" go crazy over global variables is that they constantly see them being abused, causing race conditions, and then have to listen to newbies complain that their program doesn't work and LabVIEW sucks, when it's really their programming skills that's the real problem. But that's just my opinion. -
Use of global variables like g_cnt_transactions_transferred in the LSMW
Hi SapAll.
when i had a look at the some of the LSMW's whic use IDOC as the object of uploading data into SAP from external Files i have found in the coding under the step "Maintain Field Mapping and Conversion Rules" that they use some of the global variables like below
.if p_trfcpt = yes or sy-saprl >= '46A'.
EDI_DC40-DOCNUM = g_cnt_transactions_transferred + 1.
endif.
.EDI_DC40-CIMTYP = g_cimtyp.
.EDI_DC40-MESTYP = g_mestyp.
.EDI_DC40-MESCOD = g_mescod.
.if p_filept = yes.
EDI_DC40-SNDPOR = g_fileport.
elseif p_trfcpt = yes.
EDI_DC40-SNDPOR = g_trfcport.
endif.
my doubt is where i can find these variables 'g_cnt_transactions_transferred ','g_cimtyp','g_mescod','g_fileport','g_trfcport' in the LSMW and what is the use of the variable 'g_cnt_transactions_transferred ' in the LSMW.
I have treid to find out the above listed variables looking in step 'Maintain Field Mapping and Conversion Rules' under global variabels list and the other lists also but i couldnt found.
can any one help me in this ?
regards.
Seetha.Hi Seetha,
In the LSMW Workbench go to the option user menu. And check the option display conversion program.
Now when you execute with the radio button on dislplay conversion program, you ll see the code that got generated in the background while you built your LSMW.
The global variables that you have mentioned are bound to be there in this program generated in the background..
You can put a break point here and see for yourself what the value of these global variables are at runtime.
File port, TRFC port , no. of transactions executed by one run of the LMSW Idoc program , message type are some of the fields that you have asked for .
Regards,
Arun -
Unit Testing and APEX Global Variables
We've recently started to unit test our database level PL/SQL business logic.
As such we have a need to be able to simulate or provide output from PL/SQL APEX components in order to facilitate testing of these components.
Some of the most obvious portions that need simulation are:
1. The existence of a session
2. The current application ID
3. The current page ID.
We currently handle requirement #1 by using apex_040100.wwv_flow_session.create_new
We handle 2 and 3 using the apex_application.g_flow_id and g_flow_step_id global variables.
I'm just wondering, how safe is it for us to use wwv_flow_session.create_new to simulate the creation of a session at testing time for those things which need a session?
I've also noticed that there are apex_application.get_application_id and apex_application.get_page_id functions whose output is not tied to the global variables (at least in our current version).
Is it safe for us to expect that we can set these global variables for use in testing or is apex moving to get_application_id and get_page_id functions away from global variables?
Will there be corresponding set_application_id and set_page_id functions in the future?
Sorry for the question bomb. Thanks for any help.My first question would be why do you need to establish a session to test your PL/SQL?
wwv_flow_session is a package internal to APEX, and you should probably leave it be.
The get_application_id procedure you refer to is in apex_application_install, which is used for scripting installation of applications - not get/set of page ID like you're describing.
If you're uncomfortable using apex_application.g_flow_id, you can use v('APP_ID') or preferably pass the app_id/page_id as parameters to your procedures.
Your question seems to have a few unknowns, so that's the best I can describe.
Scott -
Problem with .DLL and global variables
Hi,
I need some helps to figure out my problem.
I wrote a .dll file to open and run a GUI. When I run it at the first time, it is ok. When I call it again, there is an error "Pointer to free memory passed to library. It will be ok if I completely exit the program that calls the .dll before re-call it. I think there is some problems with global variables when I call another thread. How can I free global variables between threads. Is there any solution for this problem?
ThanksVinh Pham:
Are you doing anything intentionally that frees your globals?
CVI ships with an example program that demonstrates calling a DLL to create a user interface: guidll.cws.
I made two simple modifications to guidll.cws.
1. In guidll.c, I made hpanel global by moving its declaration from RunDLLUI() to right below the #include statements.
2. In useguidll.c, I duplicated the lines calling RunDLLUI () and MessagePopup() to call the DLL gui twice.
I built the project and ran it. I had no problems with free'ed globals.
Take a look at the guidll example.
Can you either post your code or a modification to guidll that demonstrates the problem you're having?
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