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C-/C++-Quelltext

#include <windows.h>

BOOL saveBMP(LPSTR filename, HDC hdcHBMP, int width, int height);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCommandLine, int iShowCommand)                  
{
    
    HWND hDesktop = GetDesktopWindow();
    HDC hdc = GetWindowDC(hDesktop);
    HBITMAP hBitmap=CreateCompatibleBitmap(hdc,208,156);

    void *data=malloc(208*156);
    GetBitmapBits(hBitmap, 208*156, data);

    saveBMP("hello.bmp", hdc, 1024, 768);

    return 0;
}

BOOL saveBMP(LPSTR filename, HDC hdcHBMP, int width, int height) 
{
   int offset = width%4;
   int bmpsize = 3 * width * height + height * offset;
   HDC hdcDisplay = CreateDC("DISPLAY", 0, 0, 0);
   if (hdcDisplay == NULL) return FALSE;

   BITMAPINFO bmpinfo;
   ZeroMemory(&bmpinfo, sizeof(bmpinfo));
   bmpinfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
   bmpinfo.bmiHeader.biWidth = width;
   bmpinfo.bmiHeader.biHeight = height;
   bmpinfo.bmiHeader.biPlanes = 1;
   bmpinfo.bmiHeader.biBitCount = 24;
   bmpinfo.bmiHeader.biCompression = BI_RGB;
   bmpinfo.bmiHeader.biXPelsPerMeter = 3780;
   bmpinfo.bmiHeader.biYPelsPerMeter = 3780;
   BYTE *pixels = new BYTE[bmpsize];
   HBITMAP hbmpDIB = CreateDIBSection(NULL, &bmpinfo, DIB_RGB_COLORS, (void**)&pixels, NULL, NULL);
   if (hbmpDIB == NULL) {
      delete [] pixels;
      DeleteDC(hdcDisplay);
      return FALSE;
   }
   
   HDC hdcDIB = CreateCompatibleDC(hdcDisplay);
   if (SelectObject(hdcDIB, hbmpDIB) == NULL) {
      delete [] pixels;
      DeleteDC(hdcDisplay);
      return FALSE;
   }
   if (BitBlt(hdcDIB, 0, 0, width, height, hdcHBMP, 0, 0, SRCCOPY) == NULL) {
      delete [] pixels;
      DeleteDC(hdcDisplay);
      DeleteDC(hdcDIB);
      return FALSE;
   }

   BITMAPFILEHEADER bfh;
   ZeroMemory(&bfh, sizeof(bfh));
   bfh.bfOffBits = sizeof(bmpinfo.bmiHeader)+sizeof(bfh);
   bfh.bfSize = bfh.bfOffBits+bmpsize;
   bfh.bfType = MAKEWORD('B', 'M');   

   HANDLE file = CreateFile(filename, GENERIC_WRITE, NULL, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
   if (file == INVALID_HANDLE_VALUE) {
      delete [] pixels;
      DeleteDC(hdcDisplay);
      DeleteDC(hdcDIB);
      return FALSE;
   }
   DWORD written;
   WriteFile(file, (LPCVOID)&bfh, sizeof(bfh), &written, NULL);
   WriteFile(file, (LPCVOID)&bmpinfo.bmiHeader, sizeof(bmpinfo.bmiHeader), &written, NULL);
   WriteFile(file, (LPCVOID)pixels, bmpsize, &written, NULL);
   CloseHandle(file);
   delete [] pixels;
   DeleteDC(hdcDisplay);
   DeleteDC(hdcDIB);

   return TRUE;
}