void XPackageCloseInstallationMonitorHandle(  
         XPackageInstallationMonitorHandle installationMonitor  
)  

void CALLBACK ProgressChangedCallback( 
    void* /* context*/, XPackageInstallationMonitorHandle monitor) 
{ 
    XPackageInstallationProgress progress; 
    XPackageGetInstallationProgress(monitor, &progress); 
 
    if (progress.completed) 
    { 
        printf("Track ready\n"); 
        XPackageCloseInstallationMonitorHandle(monitor); 
    } 
} 
 
HRESULT StartMonitoring(XTaskQueueHandle queue, char* trackName) 
{ 
    char id[XPACKAGE_IDENTIFIER_MAX_LENGTH]; 
 
    HRESULT hr = XPackageGetCurrentProcessPackageIdentifier(_countof(id), id); 
    if (FAILED(hr)) return hr; 
 
    XPackageChunkSelector selector; 
    selector.type = XPackageChunkSelectorType::Tag; 
    selector.tag = trackName; 
 
    XPackageInstallationMonitorHandle monitor; 
    hr = XPackageCreateInstallationMonitor( 
        id,         // Identity to be monitored 
        1,          // Number of selectors 
        &selector,  // Selectors 
        1000,       // Resolution of the monitor, in milliseconds 
        queue,      // Queue where updates are performed 
        &monitor); 
    
    if (FAILED(hr)) return hr; 
 
    XTaskQueueRegistrationToken token; 
    hr = XPackageRegisterInstallationProgressChanged( 
        monitor, 
        nullptr, 
        ProgressChangedCallback, 
        &token); 
 
    if (FAILED(hr)) 
    { 
        XPackageCloseInstallationMonitorHandle(monitor); 
    } 
 
    return hr; 
} 

XPackageGetCurrentProcessPackageIdentifier(_countof(id), id); 

XPackageCreateInstallationMonitor( 
    id,         // Identity to be monitored 
    1,          // Number of selectors 
    &selector,  // Selectors 
    1000,       // Resolution of the monitor, in milliseconds 
    queue,      // Queue where updates are performed 
    &monitor);  

HRESULT hr = XPackageRegisterInstallationProgressChanged( 
    monitor, 
    this, 
    ProgressChangedCallback,
    &token);