将HIBITMAP保存为bmp图片

来源：互联网发布：阿里云 ecs 建站教程编辑：程序博客网时间：2024/05/16 09:26

BOOL SaveBmp(HBITMAP hBitmap, CString FileName)
{
       HDC     hDC;
       //当前分辨率下每象素所占字节数
       int     iBits;
       //位图中每象素所占字节数
       WORD     wBitCount;
       //定义调色板大小，     位图中像素字节大小     ，位图文件大小     ，     写入文件字节数
       DWORD     dwPaletteSize=0,   dwBmBitsSize=0,   dwDIBSize=0,   dwWritten=0;
       //位图属性结构
       BITMAP     Bitmap;
       //位图文件头结构
       BITMAPFILEHEADER     bmfHdr;
       //位图信息头结构
       BITMAPINFOHEADER     bi;
       //指向位图信息头结构
       LPBITMAPINFOHEADER     lpbi;
       //定义文件，分配内存句柄，调色板句柄
       HANDLE     fh,   hDib,   hPal,hOldPal=NULL;

       //计算位图文件每个像素所占字节数
       hDC = CreateDC("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;

       //为位图内容分配内存
       hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
       lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
       *lpbi = bi;

       //     处理调色板
       hPal = GetStockObject(DEFAULT_PALETTE);
       if (hPal)
       {
           hDC = ::GetDC(NULL);
           hOldPal = ::SelectPalette(hDC,(HPALETTE)hPal, FALSE);
           RealizePalette(hDC);
       }

       //     获取该调色板下新的像素值
       GetDIBits(hDC,hBitmap, 0,(UINT)Bitmap.bmHeight,
           (LPSTR)lpbi+ sizeof(BITMAPINFOHEADER)+dwPaletteSize,
           (BITMAPINFO *)lpbi, DIB_RGB_COLORS);

       //恢复调色板
       if (hOldPal)
       {
           ::SelectPalette(hDC,   (HPALETTE)hOldPal,   TRUE);
           RealizePalette(hDC);
           ::ReleaseDC(NULL,   hDC);
       }

       //创建位图文件
       fh = CreateFile(FileName,   GENERIC_WRITE,0,   NULL,   CREATE_ALWAYS,
           FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN,   NULL);

       if (fh     == INVALID_HANDLE_VALUE)         return     FALSE;

       //     设置位图文件头
       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;
       //     写入位图文件头
       WriteFile(fh,   (LPSTR)&bmfHdr,   sizeof(BITMAPFILEHEADER),   &dwWritten,   NULL);
       //     写入位图文件其余内容
       WriteFile(fh,   (LPSTR)lpbi,   dwDIBSize,   &dwWritten,   NULL);
       //清除
       GlobalUnlock(hDib);
       GlobalFree(hDib);
       CloseHandle(fh);

       return     TRUE;
}

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