BOOL CShape::SaveBmp(HBITMAP hBitmap, const char *FileName)
{
HDC hDC;
//目前分辨率下每象素所占位元組數
int iBits;
//位圖中每象素所占位元組數
WORD wBitCount;
//定義調色闆大小, 位圖中像素位元組大小 ,位圖檔案大小 , 寫入檔案位元組數
DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0;
//位圖屬性結構
BITMAP Bitmap;
//位圖檔案頭結構
BITMAPFILEHEADER bmfHdr;
//位圖資訊頭結構
BITMAPINFOHEADER bi;
//指向位圖資訊頭結構
LPBITMAPINFOHEADER lpbi;
//定義檔案,配置設定記憶體句柄,調色闆句柄
HANDLE fh, hDib, hPal,hOldPal=NULL;
//計算位圖檔案每個像素所占位元組數
hDC = CreateDC(_T("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;
//為位圖内容配置設定記憶體
hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 處理調色闆
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 擷取該調色闆下新的像素值
GetDIBits(hDC,
hBitmap,
0,
(UINT)Bitmap.bmHeight,
(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize,
(BITMAPINFO *)lpbi,
DIB_RGB_COLORS);
//恢複調色闆
if (hOldPal)
{
::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//建立位圖檔案
fh = CreateFile((LPCWSTR)FileName,
GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (fh == INVALID_HANDLE_VALUE)
{
return FALSE;
}
// 設定位圖檔案頭
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;
// 寫入位圖檔案頭
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 寫入位圖檔案其餘内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}