Using a C DLL with complex numbers of Labview

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  I used the Labview FPGA module to develop test equipment. Now, I need to write a driver that is to be a Dll with compatible interface to C/C++ for this equipment. So that my client who is familiar with C/C++ can call the driver without any study on labview. But I had a few problem on how to convert labview for C/C++ data complex data type. To clearly explain to my question, I have attached a simple example. (see attachment) I try to generate a Dll for the attached example VI and get the the function prototype at the head of the files as below:

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  Ivan.Chen wrote:

  As I found in the following article:

  http://digital.NI.com/public.nsf/WebSearch/FB001AA027C8998386256AAD006C142D?OpenDocument

  LVRefNum is the name of resource of LabVIEW VISA or refnum, and "it is impossible to convert LabVIEW VISA name of resource or refnum VISession valid ID."
  This means that external code modules can not access & control the session VISA which is open by labview. But for my purposes, I will not attempt to access this VISA extenal code(C/C++) session. I just hope that save this session VISA in the external code once I opened it in Labview dll; and pass it to the labview dll when needed. While I have not need to login again when I need to control the device. Is it possible to do?

  A LVRefNum is really just a single int32 value. Its meaning is useless for other environments than those who created it so that you Michael not any what in C/C++ caller but pass it back to other functions in your DLL, but this often isn't a problem at all.

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  I have to control some electrical loads and power supplies by GPIB. We use Qt 4.7.4 with MinGW 4.4 (32-bit) on Windows 7 64 bit.

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  LIBRARY NI4882.dll
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  -.pro file-

  INCLUDEPATH += $$ PWD/include

  LIBS += $$PWD/lib/libni4882.a

  --

  -.cpp file-

  #include "ni4882.h".

  ...

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  {

  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 ("could not close the Council"));

  }

  }

  void MainWindow::Err (QString message)

  {

  Switch (Iberr ())

  {

  case 0:

  {

  message. Append ("(EDVR-erreur système)" ");

  } break;

  ...

  }

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  (unsigned int) Ibsta(), (int) Iberr ());

  }

  --

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  Error: Could not open the Board of Directors: ibdev = 32768 (EDVR - system error)

  ibsta = iberr 0x8000 = 0

  Error: Cannot close the Board of Directors (EDVR - system error)

  ibsta = iberr 0x8000 = 0

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  With interactive control GPIB tool, I can communicate with my instrument and the Trace of e/s OR it connects. But I don't see the papers in my request tracking tool. Is this an indication?

  Any ideas?

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  Hi all,

  After a few questions about the use of the GPIB with Qt library, I wrote a description step by step to create objects for MinGW files:

  1 create a folder and copy the "gpib - 32.dll' of the"C:\Windows\System32"("C:\Windows\SysWOW64"in Win7) in this folder.

  2. copy "ni488.h" to "c:\Program Files (x 86) \National Instruments\Shared\ExternalCompilerSupport\C\include\. (Not ni4882.h!)

  3. load PExports (my version is 0.44) and put the exe in your folder. I don't have a URL to load this tool but should be easy to find. It is freeware.

  4. copy "c:\QtSDK\mingw\bin\" dlltool.exe in your folder.

  5. create a batch file '1 - build def file.bat' with the content: "pexports ni488.h gpib - 32.dll h > gpib.def.

  6. create a batch file "2 - build file.bat lib" with the content: "dlltool k d gpib - 32.dll - d gpib.def-l libgpib.a.

  7. run the batch file "1 - def file.bat build" to create the file 'gpib.def' def

  8. start the batch file "2 - build file.bat lib" to create the file in the library 'libgpib.a '.

  9 copy 'gpib - 32.dll' and 'libgpib.a' in your software project. I created the 'lib' subdirectory and copied the files to.

  10. copy "ni488.h" into your software project. I created the "include" subfolder and copied the file in.

  11. in your PRO file type:

  # #####################################################################
  # Include the NI 488 library. 2
  # #####################################################################
  INCLUDEPATH += $$ PWD/include
  HEADERS += include/ni488.h

  LIBS += $$PWD/lib/libgpib.a

  12. in your type of source code:

  #include "windows.h".
  #include "ni488.h".

  bool InitializeGPIBBoard)

  {

  bool isStarting = false;

  boardID int;        / * id board @brief. */
  QString boardName;  / * @brief Committee name. */
  int boardDescr;     / * descriptor of Council @brief. */

  Get ID Board
  SendIFC (boardID);

  If (ThreadIbsta() & ERR)
  {
  ErrorHandling (tr ("failed to open the Council"));

  Return isStarting;
  }

  Open and initialize a Board or a configured by the user device descriptor
  wchar_t * aName = new wchar_t [boardName.size () + 1];
  m_para.boardName.toWCharArray (Anom);
  aName [boardName.size ()] = 0;
  m_para.boardDescr = ibfind (Anom);
  delete [aName];

  The Board of Directors is the system controller.
  If (ibconfig (boardDescr, IbcSC, 1) & ERR)
  {
  ErrorHandling (tr ("failed to create the system controller board"));

  Return isStarting;
  }

  Affirm the clear interface.
  If (ibsic (boardDescr) & ERR)
  {
  ErrorHandling (tr ("Assert clear interface"));

  Return isStarting;
  }

  ASO.

  isStarted = true;

  return isStarted.

  }

  13 be happy! :-)

  I hope this helps. If you have any problems, please write me a message or post on this thread of Council.

  Gruss und viel Erfolg!
  Marko

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