关于VNC里的录像问题

[_拂晓]

求高手帮忙：
部分代码如下：（来自NVC mirror driver）

LPBITMAPINFOHEADER alpbi;   //记录屏幕信息的位图，，，帧
alpbi=captureScreenFrame(left,top,width, height,1);   //截取的屏幕 并已经封装成帧
    
if (flashingRect) { // Set Up Flashing Rect、、、这是干嘛用的没搞懂  求解释
    pFrame->SetUpRegion(left,top,width,height,0);
    pFrame->ShowWindow(SW_SHOW);
}
//然后就是AVI文件流压缩器的初始化。。。省略一大堆。。。
FreeFrame(alpbi);//刚才截取的那一帧 没用就释放了。。。。，难道是用于初始化AVI    
alpbi=NULL;

//录像重这里真正的开始。。。。
while(1)
{
   alpbi=captureScreenFrame(left,top,width, height,0);//最后一个参数变成了 0
    hr = AVIStreamWrite(psCompressed,    // stream pointer
                    frametime,                // time of this frame
                    1,                // number to write
                    (LPBYTE) alpbi +        // pointer to data
                        alpbi->biSize +
                        alpbi->biClrUsed * sizeof(RGBQUAD),
                        alpbi->biSizeImage,    // size of this frame
                    //AVIIF_KEYFRAME,             // flags....
                    0,    //Dependent n previous frame, not key frame
                    NULL,
                    NULL);
   nActualFrame ++ ;//帧数 加1
   InvalidateRect(NULL, NULL, FALSE);//声明客户区无效,重画时不擦除背景？？
   FreeFrame(alpbi);
   alpbi=NULL;
   Sleep(5);//
}




然后下面是captureScreenFrame的实现：
LPBITMAPINFOHEADER captureScreenFrame(int left,int top,int width, int height,int tempDisableRect)
{
    HANDLE               hdib ;
    HDC                 hdc ;
    BITMAP              bitmap ;
    UINT                wLineLen ;
    DWORD               dwSize ;
    DWORD               wColSize ;
    LPBITMAPINFOHEADER  lpbi ;
    LPBYTE              lpBits ;

    //tempDisableRect仅初始化AVI的时候为 1 ， 录像阶段永远为 0 ，包挎第一帧
    if (flashingRect && !tempDisableRect) {//???????????        
            DrawFlashingRect( TRUE , 0);

    }    
    
    wLineLen = (width*bits+31)/32 * 4;//计算位图每行占多少个字节
    wColSize = sizeof(RGBQUAD)*((bits <= 8) ? 1<<bits : 0);//0
    dwSize = sizeof(BITMAPINFOHEADER) + wColSize +
        (DWORD)(UINT)wLineLen*(DWORD)(UINT)height;

    //
    // Allocate room for a DIB and set the LPBI fields
    hdib = GlobalAlloc(GHND,dwSize);
    if (!hdib)
        exit(1) ;

    lpbi = (LPBITMAPINFOHEADER)GlobalLock(hdib) ;

    lpbi->biSize = sizeof(BITMAPINFOHEADER) ;
    lpbi->biWidth = width ;
    lpbi->biHeight = height ;
    lpbi->biPlanes = 1 ;//The number of planes for the target device. This value must be set to 1.
    lpbi->biBitCount = (WORD) bits ;//灰度图像（biBitCount=8）彩色图像（biBitCount=24）
    lpbi->biCompression = BI_RGB ;//BI_RGB    An uncompressed format.
    lpbi->biSizeImage = dwSize - sizeof(BITMAPINFOHEADER) - wColSize ;//位图所占字节
    lpbi->biXPelsPerMeter = 0 ;
    lpbi->biYPelsPerMeter = 0 ;
    lpbi->biClrUsed = (bits <= 8) ? 1<<bits : 0;
    lpbi->biClrImportant = 0 ;

    //
    // Get the bits from the bitmap and stuff them after the LPBI
    lpBits = (LPBYTE)(lpbi+1)+wColSize ;


    if (videodriver.myframebuffer)//设置像素，每一帧 
        SETPIXELS_NOCONV((BYTE *)videodriver.myframebuffer,lpBits, left, top, width, height,bits,maxxScreen);
    GlobalUnlock(hdib);
                
    LPBITMAPINFOHEADER pBM_HEADER = (LPBITMAPINFOHEADER)GlobalLock(hdib);//锁定一个全局内存对象并返回一个指向对象的内存块的第一个字节。    
    //LPBITMAPINFOHEADER pBM_HEADER = (LPBITMAPINFOHEADER)GlobalLock(Bitmap2Dib(hbm, 24));    
    if (pBM_HEADER == NULL) { 
            
        //MessageBox(NULL,"Error reading a frame!","Error",MB_OK | MB_ICONEXCLAMATION);                    
        MessageOut(NULL,IDS_STRING_ERRFRAME ,IDS_STRING_NOTE,MB_OK | MB_ICONEXCLAMATION);

        exit(1);
    }        
    //if flashing rect
    if (flashingRect && !tempDisableRect) {
            DrawFlashingRect(FALSE , 0);
    }    
    
    return pBM_HEADER;   
}





void DrawFlashingRect(BOOL bDraw , int mode) {        
    if (mode == 1) { 
            
            pFrame->PaintInvertedBorder(RGB(0,255,80));//绘画倒转的边框，永不执行
    }
    else {    
    
        if (bDraw)
            pFrame->PaintBorder(RGB(255,255,180));
        else
            pFrame->PaintBorder(RGB(0,255,80));
    }    
}






void CFlashingWnd::PaintBorder(COLORREF colorval)
{

    // Add your drawing code here!
    HDC hdc = ::GetDC(m_hWnd);
    if ((cRect.right>cRect.left) && (cRect.bottom>cRect.top)) {    
        
        HBRUSH newbrush = (HBRUSH) CreateSolidBrush( colorval);
        HBRUSH newpen = (HBRUSH) CreatePen(PS_SOLID,1, colorval);
        HBRUSH oldbrush = (HBRUSH) SelectObject(hdc,newbrush);
        HBRUSH oldpen = (HBRUSH) SelectObject(hdc,newpen);

        
        Rectangle(hdc,cRect.left-THICKNESS,cRect.top-THICKNESS,cRect.right+THICKNESS,cRect.bottom+THICKNESS); 
        
        SelectObject(hdc,oldpen);
        SelectObject(hdc,oldbrush);
        DeleteObject(newpen);    
        DeleteObject(newbrush);    

    }
   
    ::ReleaseDC(m_hWnd,hdc);
}

我想请问大伙儿在captureScreenFrame中2次if语句是干嘛用的 谢谢
if (flashingRect && !tempDisableRect) {//???????????
DrawFlashingRect( TRUE , 0);

}
if (flashingRect && !tempDisableRect) {
DrawFlashingRect(FALSE , 0);
}

if (flashingRect) { // Set Up Flashing Rect、、、这是干嘛用的没搞懂 求解释
pFrame->SetUpRegion(left,top,width,height,0);
pFrame->ShowWindow(SW_SHOW);
}


原帖地址http://topic.csdn.net/u/20120509/13/282e8067-c135-4314-8d1e-cc0d7ada8ca8.html

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