Sourcecodes - Bitmap speichern

Code:


int DC2Bitmap(HDC hdc, int width, int height, char *filename)
{
   HDC hdc2;
   HBITMAP aBmp;
   BITMAPINFO bi;
   HGDIOBJ OldObj;
   void *dibvalues;
   HANDLE fileHandle;

   BITMAPFILEHEADER bmfh;
   BITMAPINFOHEADER bmih;
   DWORD bytes_write;
   DWORD bytes_written;

   hdc2=CreateCompatibleDC(hdc);
    
   ZeroMemory(&bmih,sizeof(BITMAPINFOHEADER));
   bmih.biSize=sizeof(BITMAPINFOHEADER);
   bmih.biHeight=height;
   bmih.biWidth=width;
   bmih.biPlanes=1;
   bmih.biBitCount=24;
   bmih.biCompression=BI_RGB;
   bmih.biSizeImage = ((((bmih.biWidth * bmih.biBitCount) + 31)
                           & ~31) >> 3) * bmih.biHeight;

   bmih.biXPelsPerMeter = 0;
   bmih.biYPelsPerMeter = 0;
   bmih.biClrImportant = 0;
        
   bi.bmiHeader=bmih;

   aBmp=CreateDIBSection(hdc,&bi,DIB_RGB_COLORS,(void**)&dibvalues,0,0);
        
   if(aBmp==NULL)
   {
       OutputDebugString("CreateDIBSection failed!\n");
       return 0;
   }

   OldObj=SelectObject(hdc2,aBmp);
   BitBlt(hdc2,0,0,width,height,hdc,0,0,SRCCOPY);

   ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));
   bmfh.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
   bmfh.bfSize=(3*bmih.biHeight*bmih.biWidth)+sizeof(BITMAPFILEHEADER)
                                             +sizeof(BITMAPINFOHEADER);

   bmfh.bfType=0x4d42;
   bmfh.bfReserved1 = 0;
   bmfh.bfReserved2 = 0;

   fileHandle=CreateFile(filename,GENERIC_READ|GENERIC_WRITE,(DWORD)0,NULL,
                        CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,(HANDLE) NULL);
                          
   if (fileHandle==INVALID_HANDLE_VALUE)
   {
       OutputDebugString("CreateFile failed!\n");
       return 0;
   }
    
   bytes_write=sizeof(BITMAPFILEHEADER);
            
   if (!WriteFile(fileHandle,(void*)&bmfh,bytes_write,&bytes_written,NULL))
   {
       OutputDebugString("WriteFile failed!\n");
       return 0;
   }

   bytes_write=sizeof(BITMAPINFOHEADER);
    
   if(!WriteFile(fileHandle,(void*)&bmih,bytes_write,&bytes_written,NULL))
   {
        OutputDebugString("WriteFile failed!\n");
       return 0;
   }    
        
   bytes_write=bmih.biSizeImage;
    
   if(!WriteFile(fileHandle,(void*)dibvalues,
              bytes_write,&bytes_written,NULL))
   {
       OutputDebugString("WriteFile failed!\n");
       return 0;
   }

   CloseHandle(fileHandle);

   DeleteObject(SelectObject(hdc2,OldObj));
   DeleteDC(hdc2);
   return 1;
}