Method Open

Service/DisplayXLib.cpp:74–140

}

int CDisplayXLib::Open()
{
    int nRet = 0;
    /* Connect to a local display.
     * it defaults to the value of the DISPLAY environment variable. */
    m_pDisplay = XOpenDisplay(NULL);
    do{
        if(!m_pDisplay)
        {
            nRet = -1;
        }
       
        if (strstr(ServerVendor(m_pDisplay), "X.Org")) {
            int vendrel = VendorRelease(m_pDisplay);
            
            QString version("X.Org version: ");
            version += QString::number(vendrel / 10000000);
            version += "." + QString::number((vendrel /   100000) % 100),
                    version += "." + QString::number((vendrel /     1000) % 100);
            if (vendrel % 1000) {
                version += "." + QString::number(vendrel % 1000);
            }
            qInfo(LogScreen) << version;
        }
        
        m_RootWindow = DefaultRootWindow(m_pDisplay); // RootWindow(dsp,0);/* Refer to the root window */
        if(0 == m_RootWindow)
        {
            qCritical(LogScreen) << "cannot get root window";
            nRet = -2;
            break;
        }
    }while(0);
    
    if(nRet)
    {   
        Close();
        return nRet;
    }
    
    // Initial QImage and XImage
    Visual* vis = DefaultVisual(m_pDisplay, DefaultScreen(m_pDisplay));
    if (vis && vis->c_class == TrueColor) {
        m_pImage = XCreateImage(m_pDisplay, vis,
                            DefaultDepth(m_pDisplay, DefaultScreen(m_pDisplay)),
                            ZPixmap, 0, 0, Width(), Height(),
                            BitmapPad(m_pDisplay), 0);
        if(m_pImage) {
            m_pImage->data = (char *)malloc(m_pImage->bytes_per_line * m_pImage->height);
            if (m_pImage->data) {
                m_Format = GetFormat(m_pImage);
                if(QImage::Format_Invalid != GetFormat()) {
                    m_Desktop = QImage((uchar*)m_pImage->data,
                                     Width(), Height(), GetFormat());
                    //m_Desktop.fill(QColor(0,0,0,0));
                }
            }