Taking a Screenshot in C using Win32 API

//Taking screenshots in C using Win32 api.
//Code sources:
//http://codepads.blogspot.co.il/2011/06/how-to-save-hbitmap-handle-to-bmp-file.html
//http://www.gamedev.net/topic/181269-win32-api-screenshot/
//MSDN

#include <Windows.h>
#include <stdio.h>

BOOL SaveToFile(HBITMAP hBitmap, LPCSTR lpszFileName)
{
  HDC hDC;

  int iBits;

  WORD wBitCount;

  DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0;

  BITMAP Bitmap;

  BITMAPFILEHEADER bmfHdr;

  BITMAPINFOHEADER bi;

  LPBITMAPINFOHEADER lpbi;

  HANDLE fh, hDib, hPal,hOldPal=NULL;

  hDC = CreateDCA("DISPLAY", NULL, NULL, NULL);
  iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);
  DeleteDC(hDC);
  if (iBits <= 1)
    wBitCount = 1;
  else if (iBits <= 4)
    wBitCount = 4;
  else if (iBits <= 8)
    wBitCount = 8;
  else
    wBitCount = 24;
  GetObject(hBitmap, sizeof(Bitmap), (LPSTR)&Bitmap);
  bi.biSize = sizeof(BITMAPINFOHEADER);
  bi.biWidth = Bitmap.bmWidth;
  bi.biHeight = Bitmap.bmHeight;
  bi.biPlanes = 1;
  bi.biBitCount = wBitCount;
  bi.biCompression = BI_RGB;
  bi.biSizeImage = 0;
  bi.biXPelsPerMeter = 0;
  bi.biYPelsPerMeter = 0;
  bi.biClrImportant = 0;
  bi.biClrUsed = 0;
  dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight;

  hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));
  lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
  *lpbi = bi;

  hPal = GetStockObject(DEFAULT_PALETTE);
  if (hPal)
  {
    hDC = GetDC(NULL);
    hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
    RealizePalette(hDC);
  }


  GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)
    +dwPaletteSize, (BITMAPINFO *)lpbi, DIB_RGB_COLORS);

  if (hOldPal)
  {
    SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
    RealizePalette(hDC);
    ReleaseDC(NULL, hDC);
  }

  fh = CreateFileA(lpszFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,
    FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);

  if (fh == INVALID_HANDLE_VALUE)
    return FALSE;

  bmfHdr.bfType = 0x4D42; // "BM"
  dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;
  bmfHdr.bfSize = dwDIBSize;
  bmfHdr.bfReserved1 = 0;
  bmfHdr.bfReserved2 = 0;
  bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER) + dwPaletteSize;

  WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);

  WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);
  GlobalUnlock(hDib);
  GlobalFree(hDib);
  CloseHandle(fh);
  return TRUE;
}

int main()
{
    HDC dcScreen, dcDest;
    RECT screen;
    HBITMAP screenshot;
    BOOL res;

    printf("Press enter to take a screenshot!");
    getchar();

    dcScreen = GetWindowDC(NULL); //Gets the DC for the entire screen;
    GetWindowRect(GetDesktopWindow(), &screen);
    dcDest = CreateCompatibleDC(dcScreen);
    screenshot = CreateCompatibleBitmap(dcScreen, screen.right, screen.bottom);
    SelectObject(dcDest, screenshot);
    BitBlt(dcDest, 0, 0, screen.right, screen.bottom, dcScreen, 0, 0, SRCCOPY);
    ReleaseDC(NULL, dcScreen);
    DeleteDC(dcDest);

    res = SaveToFile(screenshot, "C:\\Users\\user\\Desktop\\screenshots\\screenshot.bmp");
    printf("%d\n", res);

    return 0;
}