Can't debug LabVIEW built shared library

I'm using LabVIEW 8.20 and have built a shared library containing a single VI that will be called from C/C++.
In the build specification, I've enabled debugging and marked 'Wait for debugger on launch'.
I start a C, C++ or LabVIEW application that calls the VI. Now, the "One or more VIs are paused..." message is displayed.
From the Project Explorer window I select Operate->Debug Application or Shared Library... and tries to connect to the application.
The "Failed to connect to remote application" is displayed each time.
I've followed every step in the Debugging Applications and Shared Libraries section of the LabVIEW Help.
If I turn the VI into an Application instead of a Shared Library there's no problem debugging it.
Regards,
tosko

I'm having the exact same problem, only I've tried to prevent all debugging.
I still get the "One or more VIs are paused" message when I call the function via the DLL, but don't get it when I run the executable.
@tosko: Did you ever fix this issue?
@Everyone: Any ideas on a fix?
Edit: Nevermind. I didn't realize I had the following option checked: "My DLL Properties" (dialog) -> Advanced (left menu item) -> Wait for debugger on launch (checkbox). I unchecked it, rebuilt and it works like a charm.
Message Edited by StevenATK on 04-14-2010 01:52 PM

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Pass the command line argument (argc and argv) to a LabVIEW built shared library.

Hello,
I have successully use this trick to build a LabVIEW application that runs on Linux without X Display.
http://digital.ni.com/public.nsf/allkb/5D6EC36DCF43343786257449006919E6
I'd like to know if it's possible to pass the command line arguments ( ./TEST A B C D) directly into the shared library without having to pass the arguments using a array of strings which would require to write code using DSNewHandle, DSSetHandleSize, extract the arguments and ..... (I'm not proficient in C, but if I don't have a choice I will do it and improve my C skills).
int main(int argc, char *argv[])
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return 0;
Thanks,
Michel
Solved!
Go to Solution.

Well, you can always flatten it back into a space separated single string and pass it like that. Basically reverse what the OS does when it calls your main function with the command line parameters. And while the first element in the array is always the program name itself you can just skip that here, but then format all the rest into a single string.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Can you sync from a shared library

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All the cutting and pasting and I forgot the machine information:
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How can I access the Home Sharing Library from my iPad?

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How can I use a shared library made with the application builder?

Hi,
I am using LabVIEW 7.1 running on Slackware 10.1 (kernel 2.4.29) and I am trying to call a graph display from a C program that I use for debugging VME access from a VMIVME controler. So using the application builder I built the VI as a shared library (graph.vi -> graph.so) containing a function called "graph". In my main program the call to the dlopen fails with the error: "graph.so: undefined symbol: UninitLVClient". When I examin graph.so with nm I see that UninitLVClient and other LabVIEW functions are indeed undefined and using ldd shows that graph.so has dependencies only on libc.so.* and *linux*.so.* but not on LabVIEW related stuff. Those functions are defined in the liblv.so that's in the cintools directory but I have no idea if the user is supposed to use that.
So I think I am missing an important concept here. Can somebody help or direct me to some documentation (I found lots of information about how to link external code to LabVIEW but nothing about how to link LabVIEW code to an external program)?

Thanks Watermann,
your message has been very useful so now I am linking to the proper library but I still have problems when trying to load dynamically the shared library produced with LabVIEW. It is strange that I could successfully load the lvrt library at loading time but it does not work when I am loading the library at execution time.
I made a small LabVIEW program that prints a hello window and I am calling it from a C program. In the first program main.c I am linking to the lvrt library at loading time and it works but in the second one I am linking dynamically at execution time and it does not work. For my work I need to be able to load code done in LabVIEW at execution time. Any help is appreciated!
Program main.c:
// small program to call a LabVIEW shared library
#include
#include
#include "hello.h" // got this from the LabVIEW builder, i.e. when I made the hello.so
int main(void)
printf("Hello from C!\nLets call LabVIEW now\n");
hello();
printf("Bye ... \n");
return 0;
The command to compile main.c, i.e. linking shared library lvrt when loading main program:
gcc -Wall -I /usr/local/lv71/cintools/ -o main main.c hello.so -l lvrt
The LD_LIBRARY_PATH has been defined and exported:
$ LD_LIBRARY_PATH=$PWD
$ export LD_LIBRARY_PATH
IT WORKS!
Program main2.c:
// small program to call a LabVIEW shared library
#include
#include
#include
int main(void)
void * h_lvrt;
void * h_hello;
void (* hello)(void);
char * error;
printf("Hello from C!\nLets call LabVIEW now\n");
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// in my computer located at /usr/local/lib/liblvrt.so
h_lvrt = dlopen("/usr/local/lib/liblvrt.so", RTLD_NOW);
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error = dlerror();
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// in my computer located at /home/darss/lv_call/hello.so
h_hello = dlopen("hello.so", RTLD_NOW);
// check for error
error = dlerror();
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printf("%s\n", error);
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hello = dlsym(h_hello, "hello");
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error = dlerror();
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dlclose(h_hello);
// close LabVIEW RunTime shared library
dlclose(h_lvrt);
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printf("%s\n", error);
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hello();
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dlclose(h_hello);
// close LabVIEW RunTime shared library
dlclose(h_lvrt);
printf("Bye ... \n");
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The command to compile main2.c, i.e. dynamically linking library lvrt at execution of main2 program:
gcc -Wall -o main2 main2.c -l dl
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IT DOES NOT WORK!
Program output:
Hello from C!
Lets call LabVIEW now
error : could not open hello library
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Can allication reffer the shared library using STL?

I want to make the shared library which using STL, and make application using this liblary.
I suceed making shared liblary which using STL, but failed to building allication program. The error message is following ...
/opt/SUNWspro/bin/CC -Kpic -g -mt -V -D_REENTRANT -DFSUN -D_DEBUG -I/export/home/efm/kawaha/EFCFEnv/include -o ./TestDriver.exe SampleDriver.cpp -L/export/home/efm/kawaha/EFCFEnv/lib -L/usr/j2se/jre/lib/sparc/server/ -L/opt/SUNWspro/lib -L/opt/SUNWspro/WS6U1/lib -lhtefcfenv -L/usr/j2se/jre/lib/sparc/server/
CC: Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
ccfe: Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
CClink: Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
CC: Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
/opt/SUNWspro/bin/../WS6U1/bin/c++filt: Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
ld: Software Generation Utilities - Solaris-ELF (4.0)
Undefined first referenced symbol in file
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unsigned __rwstd::__rb_tree<std::basic_string<char,std::char_traits<char>,std::allocator<char> >,std::pair<const std::basic_string<char,std::char_traits<char>,std::allocator<char> >,EFCFMapValue*>,__rwstd::__select1st<std::pair<const std::basic_string<char,std::char_traits<char>,std::allocator<char> >,EFCFMapValue*>,std::basic_string<char,std::char_traits<char>,std::allocator<char> > >,std::less<std::basic_string<char,std::char_traits<char>,std::allocator<char> > >,std::allocator<std::pair<const std::basic_string<char,std::char_traits<char>,std::allocator<char> >,EFCFMapValue*> > >::count(const std::basic_string<char,std::char_traits<char>,std::allocator<char> >&)const /export/home/efm/kawaha/EFCFEnv/lib/libhtefcfenv.so
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Can the applicaton reffer the shared library using STL?
or
Can the applicaton reffer the static library using STL?
Mihoko

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Unable to see shared library

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Both PC's:
...can connect to the internet
...can transfer files back and forth
...can see each others "Shared Docs" directory
...have iTunes and Bonjour listed as exceptions in Windows Firewall
...have the latest verions of iTunes and Bonjour
When I point the iTunes Music Folder location on the 'remote' PC to the iTunes Music Folder on the 'host' PC, it finds it, see's it, and then asks if I want to update (the view)? to match? I said yes. Still the same list of songs that are physically on the remote PC and nowhere does it say anything about sharing or give any indication that it is aware of the host library.
What am I not getting?

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"do you have Sharing and "Look for shared" turned on in the iTunes Sharing preferences?"
Yes.
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Figured it out. Duh.

Can't debug LabVIEW built shared library

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