CBitmap保存为Bmp文件 VC++ MFC实现

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感谢这位同学的分享：http://wenku.baidu.com/view/f4f1580b76c66137ee061903.html

将下面函数复制到自己的类中，函数为：

void CMyDlg::MySaveBmpTofile(HBITMAP hbmp, CString path)

{

//参数说明: hbmp :需保存的图象的句柄         path :保存路径

//定义文件头结构
BITMAPFILEHEADER fileHead;
int fileHeadLen = sizeof( BITMAPFILEHEADER );
//定义图象信息结构
BITMAPINFOHEADER bmpHead;
int bmpHeadLen =sizeof( BITMAPINFOHEADER );

BITMAP bmpObj;
GetObject( hbmp, sizeof(BITMAP), &bmpObj );
DWORD fileSizeInByte;                //文件总的字节大小
//获取系统颜色深度,即每个象素用多少位表还示
DWORD PixelSizeInBit;
CDC srcDC;                        //系统屏幕设备描述表

    srcDC.CreateDC( "DISPLAY", NULL, NULL, NULL);
PixelSizeInBit=srcDC.GetDeviceCaps( BITSPIXEL ) * srcDC.GetDeviceCaps( PLANES );
fileSizeInByte = fileHeadLen + bmpHeadLen + bmpObj.bmWidth*bmpObj.bmHeight*PixelSizeInBit/8;
//初始化文件头结构
    fileHead.bfOffBits = fileHeadLen + bmpHeadLen;
fileHead.bfReserved1=0;
fileHead.bfReserved2=0;
fileHead.bfSize = fileSizeInByte;
fileHead.bfType = 0x4D42;
///初始图像信息结构
bmpHead.biBitCount = PixelSizeInBit;
bmpHead.biCompression = BI_RGB;
bmpHead.biPlanes = 1;
bmpHead.biHeight = bmpObj.bmHeight;
bmpHead.biWidth = bmpObj.bmWidth;
bmpHead.biSize = bmpHeadLen;

//为文件分配空间
PBYTE pFile=new byte[ fileSizeInByte ];
memset( pFile, 0, fileSizeInByte );
//填充文件头部
memcpy( pFile, (PBYTE)&fileHead, fileHeadLen);
    //填充文件信息头部结构
memcpy( pFile+fileHeadLen, (PBYTE)&bmpHead, bmpHeadLen);

    //填充象素部分
GetDIBits( srcDC.m_hDC, hbmp, 0, bmpObj.bmHeight, pFile+fileHeadLen+bmpHeadLen, (LPBITMAPINFO)(pFile+fileHeadLen), DIB_RGB_COLORS);

//打开文件并写入数据
HANDLE hFile;

hFile=CreateFile( path, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if( hFile==INVALID_HANDLE_VALUE )
{
        MessageBox( "创建文件失败" );
  return;
}
    DWORD nByteTransfered;
WriteFile( hFile, pFile, fileSizeInByte, &nByteTransfered, NULL);
CloseHandle( hFile );
    //清理
delete pFile;
srcDC.DeleteDC();

}

在调用的时候，使用如下方式：

MySaveBmpTofile((HBITMAP)bitmap,"F:\\2.bmp");