流式安装:状态

class GameTrackMonitor 
{ 
public: 
 
    HRESULT StartMonitoring(XTaskQueueHandle queue, const char* trackName) 
    { 
        char id[PACKAGE_IDENTIFIER_MAX_LENGTH]; 
 
        XPackageChunkSelector selector; 
        selector.type = XPackageChunkSelectorType::Tag; 
        selector.tag = trackName; 
 
        RETURN_IF_FAILED(XPackageGetCurrentProcessPackageIdentifier(_countof(id), id)); 
 
        XPackageInstallationMonitorHandle monitor; 
 
        RETURN_IF_FAILED(XPackageCreateInstallationMonitor( 
            id,         // Identity to monitor. 
            1,          // Number of selectors. 
            &selector,  // Selectors. 
            1000,       // Resolution of monitor in ms. 
            queue,      // Queue where updates are performed. 
            &monitor)); 
 
        XTaskQueueRegistrationToken token; 
 
        HRESULT hr = XPackageRegisterInstallationProgressChanged( 
            monitor, 
            this, 
            [](void *context, XPackageInstallationMonitorHandle monitor) 
        { 
            GameTrackMonitor* pthis = static_cast<GameTrackMonitor*>(context); 
            XPackageInstallationProgress progress; 
 
            XPackageGetInstallationProgress(monitor, &progress); 
            pthis->DrawProgress(progress); 
            if (progress.completed) 
            { 
                pthis->TrackReady(); 
                XPackageCloseInstallationMonitorHandle(monitor); 
            } 
        }, &token); 
 
        if (FAILED(hr)) 
        { 
            XPackageCloseInstallationMonitorHandle(monitor); 
        } 
 
        return hr; 
    } 
 
private: 
 
    void DrawProgress(const XPackageInstallationProgress& progress) 
    { 
        // ... 
    } 
 
    void TrackReady() 
    { 
        // ... 
    } 
};