BMP文件的相关操作

来源：互联网发布：房地产研究数据库编辑：程序博客网时间：2024/06/08 05:07

 // write out a BMP file，DirectShow中例子截取的        //m_szSnappedName 要生成的BMP文件名字//pBuffer BMP数据        HANDLE hf = CreateFile(            m_szSnappedName, GENERIC_WRITE, FILE_SHARE_READ, NULL,            CREATE_ALWAYS, NULL, NULL );        if( hf == INVALID_HANDLE_VALUE )            return 0;        // write out the file header        //        BITMAPFILEHEADER bfh;        memset( &bfh, 0, sizeof( bfh ) );        bfh.bfType = 'MB';        bfh.bfSize = sizeof( bfh ) + lBufferSize + sizeof( BITMAPINFOHEADER );        bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER );        DWORD dwWritten = 0;        WriteFile( hf, &bfh, sizeof( bfh ), &dwWritten, NULL );        // and the bitmap format        //        BITMAPINFOHEADER bih;        memset( &bih, 0, sizeof( bih ) );        bih.biSize = sizeof( bih );        bih.biWidth = lWidth;        bih.biHeight = lHeight;        bih.biPlanes = 1;        bih.biBitCount = 24;        dwWritten = 0;        WriteFile( hf, &bih, sizeof( bih ), &dwWritten, NULL );        // and the bits themselves        //        dwWritten = 0;        WriteFile( hf, pBuffer, lBufferSize, &dwWritten, NULL );        CloseHandle( hf );        bFileWritten = TRUE;        // Display the bitmap bits on the dialog's preview window//显示，下面代码有该函数的定义        DisplayCapturedBits(pBuffer, &bih);

//如果要防止重绘时图片被擦除，可以在OnPaint函数中在调用一次这个函数    BOOL DisplayCapturedBits(BYTE *pBuffer, BITMAPINFOHEADER *pbih)    {        // If we haven't yet snapped a still, return        if (/*!bFileWritten || !pOwner ||*/ !pBuffer)            return FALSE;        // put bits into the preview window with StretchDIBits        //        HWND hwndStill = NULL;        pOwner->GetDlgItem( IDC_STILL, &hwndStill );//IDC_STILL显示图片的控件ID        RECT rc;        ::GetWindowRect( hwndStill, &rc );        long lStillWidth = rc.right - rc.left;        long lStillHeight = rc.bottom - rc.top;                HDC hdcStill = GetDC( hwndStill );        PAINTSTRUCT ps;        BeginPaint(hwndStill, &ps);        SetStretchBltMode(hdcStill, COLORONCOLOR);        StretchDIBits(                     hdcStill, 0, 0,                     lStillWidth, lStillHeight,                     0, 0, lWidth, lHeight,                     pBuffer,                     (BITMAPINFO*) pbih,                     DIB_RGB_COLORS,                     SRCCOPY );        EndPaint(hwndStill, &ps);        ReleaseDC( hwndStill, hdcStill );            return TRUE;    }

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