Calling nilvaiu.dll from c++

[DougieB]

I have a Labview program that will call a number DLLs written in C++. I'm trying to setup my DAQ using DAQMX so that when I call the C++ DLLs, they can in turn call the DAQRead functions from DAQMX.

Looking into a simple boolean digital readin DAQMX, it calls the DAQRead1Chan1Samp1LineBool method in nilvaiu.dll - I wrote a C++ DLL to call this instead, but I'm running into problems - see code snippet below. Is anyone able to point out where I'm going wrong? 

int mydaq(int taskID, char* value)
{
   /* get handle to dll */
   HINSTANCE hGetProcIDDLL = LoadLibrary("nilvaiu.dll");

   /* get pointer to the function in the dll*/
   FARPROC lpfnGetProcessID = GetProcAddress(HMODULE (hGetProcIDDLL),"DAQRead1Chan1Samp1LineBool");

   /*
      Define the Function in the DLL for reuse. This is just prototyping the dll's function.
      A mock of it. Use "stdcall" for maximum compatibility.
   */
   typedef int (__cdecl * pICFUNC)(int, long, char*, char*);

   pICFUNC DAQRead1Chan1Samp1LineBool;
   DAQRead1Chan1Samp1LineBool = pICFUNC(lpfnGetProcessID);

   /* The actual call to the function contained in the dll */
   int intMyReturnVal = DAQRead1Chan1Samp1LineBool(taskID, 1.0, value, "");

   /* Release the Dll */
   //FreeLibrary(hGetProcIDDLL);

   return true;
}

Cheers,

Dougie

[DougieB]

Never mind, needed caffeine! Problem solved 

int mydaq(unsigned int taskID, unsigned char* value)
{
   /* get handle to dll */
   HINSTANCE hGetProcIDDLL = LoadLibrary("C:\\WINDOWS\\system32\\nilvaiu.dll");

   /* get pointer to the function in the dll*/
   FARPROC lpfnGetProcessID = GetProcAddress(HMODULE (hGetProcIDDLL),"DAQRead1Chan1Samp1LineBool");

   /*
      Define the Function in the DLL for reuse. This is just prototyping the dll's function.
      A mock of it. Use "stdcall" for maximum compatibility.
   */
   typedef int (__cdecl * pICFUNC)(unsigned int, double, unsigned char*, char*);

   pICFUNC DAQRead1Chan1Samp1LineBool;
   DAQRead1Chan1Samp1LineBool = pICFUNC(lpfnGetProcessID);

   /* The actual call to the function contained in the dll */
   int intMyReturnVal = DAQRead1Chan1Samp1LineBool(taskID, 1.0, value, "");

   /* Release the Dll */
   FreeLibrary(hGetProcIDDLL);

   return intMyReturnVal;
}