mfcc++如果我想只将对话框中的二维码保存为bmp格式的图片应该怎样做，急求

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贴个函数吧

CDC::GetCurrentBitmap可以得到当前窗口DC的位图对象.

BOOL CShape::SaveBmp(HBITMAP hBitmap, const char *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(_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;       //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((LPCWSTR)FileName,           GENERIC_WRITE,     0,         NULL,        CREATE_ALWAYS,               FILE_ATTRIBUTE_NORMAL,     NULL);/*     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;      }