how can i use Dll function in qt

Question

how can i use this dll function?:

extern "C"__declspec(dllexport) 
  void   __cdecl InvertRawPic(unsigned char *In, unsigned char *Out, 
                              unsigned int rows, unsigned int cols);

in QT. This function is to invert images.

Answer 1

thanks but it doesn't work This I'm try

const unsigned char ROWS=8;
const unsigned char COLS=8;

unsigned char RawPicIn[ROWS*COLS]  =
                                                           {255,0,0,0,0,0,0,0,
                                                            0,255,0,0,0,0,0,0,
                                                                0,0,255,0,0,0,0,0,
                                                                0,0,0,255,0,0,0,0,
                                                                0,0,0,0,255,0,0,0,
                                                                0,0,0,0,0,255,0,0,
                                                                0,0,0,0,0,0,255,0,
                                                                0,0,0,0,0,0,0,255};

unsigned char RawPicOut[ROWS*COLS] ;



__declspec(dllexport)typedef void  (*ft)(unsigned char *In, unsigned char *Out, unsigned int rows, unsigned int cols);


void ImageWindow::berechnenDLL()
{
// Fall 2: DLL-Funktion mit Übergabe eines Rohbildes (nur Array)
    HINSTANCE h = LoadLibrary(L"DllMitLTI");
   if(!h) { MessageBox(0,L"dll nicht gef11111.",L"",MB_OK); return; }
   FARPROC f = GetProcAddress(h,"InvertRawPic");
  ft  f1 = (ft) f;

   if(!f1) { MessageBox(0,L"func nicht2 gef.",L"",MB_OK); return; }
 f1(RawPicIn, RawPicOut, ROWS, COLS);
 MessageBox(0,L"aufruf erfolgreich",L"",MB_OK);}