Hello,
So I have been trying and trying to get two different parts of my project working together, and right now this involves calling a LabVIEW analysis function (namely, PeakD) in a C/C++ executable. I have made sure to include all necessary header files from the resource folder and define all relevant structs, in addition to reading about the TD1/TD2 data types and the prototype header but I still cannot figure out what I am doing wrong! Here is the code I have written:
// PeakD.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <stdio.h> #include <windows.h> #include "extcode.h"/* Typedefs */typedef struct { long dimSize; double elt[1];} TD2;typedef TD2 **TD2Hdl;typedef struct { TD2Hdl Input_Array; double Threshold; long Width; unsigned long PeaksValleys; TD2Hdl Peak_Locations; TD2Hdl Peak_Amplitudes; TD2Hdl Peak_Second_Derivatives; long elt8; long elt9;} TD1;typedef struct { long Span; long Index; long NHistoryPts; long Len; long PrevSign; long unused; unsigned long RinvQtPointer; unsigned long FitBufferPointer; unsigned long HistoryPointer; unsigned long PrevCoeffPointer; unsigned long DataPointer; unsigned long slackForRinvQt; unsigned long slackForFitBuffer; unsigned long slackForHistory; unsigned long slackForPrevCoeff; unsigned long slackForData;} TD3;/* Prototypes */typedef void (*MYPROC)(TD1 *PeakApp, TD3 *pPEAKINT, TD2Hdl *SavedData, long *pErr);void _tmain(int argc, _TCHAR* argv[]){ // File: RUNTIME.C // Sample code that uses LoadLibrary and GetProcAddress to access myFunction from MYDLL.DLL. // You will need to include stdio.h and windows.h in your project to use this code HINSTANCE hinstLib; MYPROC ProcAdd; BOOL fFreeResult, fRunTimeLinkSuccess = FALSE; // Get a handle to the DLL module. hinstLib = LoadLibrary(_T("lvanlys")); // Function inputs. TD1 *PeakApp = 0; TD3 *pPEAKINT = 0; TD2Hdl *SavedData = 0; long *pErr = 0; PeakApp = new TD1; pPEAKINT = new TD3; SavedData = new TD2Hdl; pErr = new long; PeakApp->Input_Array[0]->dimSize = 1; PeakApp->Input_Array[0]->elt[0] = 1; PeakApp->Threshold = 10; // Between 0 and 60 PeakApp->Width = 10; // 0 is Peaks, 1 is Valleys PeakApp->PeaksValleys = 0; // Process the beginning of data PeakApp->elt8 = 1; // Process the end of data PeakApp->elt9 = 1; // If the handle is valid, try to get the function address. if (hinstLib != NULL) { ProcAdd = (MYPROC) GetProcAddress(hinstLib, "PeakD"); // If the function address is valid, call the function. if (fRunTimeLinkSuccess = (ProcAdd != NULL)) //(ProcAdd) ("message via DLL function\n"); (ProcAdd) (PeakApp, pPEAKINT, SavedData, pErr); // Free the DLL module fFreeResult = FreeLibrary(hinstLib); } // If unable to call the DLL function, use an alternative if (! fRunTimeLinkSuccess) printf("message via alternative method\n"); }
I am supposed to pass pointers (or more specifically, handles) to the "NI Data Objects" which have a long which signifies the size (dim_size) and the rest of the elements (in elt[]). LabVIEW 8 shows this function's prototype and the necessary pointers as being:
typedef long (*MYPROC)(void *PeakApp, void *pPEAKINT, Array1DDouble ***SavedData, long *pErr);
Does this mean that I have to manually cast my integer-based pointer into a (void*) when entering MYPROC (PeakD)? This hasn't worked for me so far, so I'm assuming that the problem lies with my data structures. Anyways, I would greatly appreciate your help on this matter, thanks.
~Ali
