c#-4.0 - Metro App Detect Printer Charm 打开和关闭

Question

我有一个 Metro 应用程序，想检测打印机魅力何时打开和关闭。这可能吗？

Answer 1

您可以使用PrintManager'PrintTaskRequested事件。打开打印机超级按钮栏时，会发生该事件。PrintTaskRequested事件使用PrintTask对象进行打印。它有一个称为Completed事件的事件。它在打印任务完成时发生。

PrintTask类的 MSDN 文档

PrintManager类的 MSDN 文档

XAML

<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
    <Button Click="Button_Click_1" Content="Print" />
</Grid>

C＃

public sealed partial class BlankPage2 : Page
{
    public BlankPage2()
    {
        this.InitializeComponent();
        PrintManager printMan = PrintManager.GetForCurrentView();
        printMan.PrintTaskRequested += PrintTaskRequested;
    }

    private void PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs e)
    {
        System.Diagnostics.Debug.WriteLine("Printer Opened");
        //TODO:
        PrintTask printTask = e.Request.CreatePrintTask(....);
        printTask.Completed += printTask_Completed;
    }

    void printTask_Completed(PrintTask sender, PrintTaskCompletedEventArgs args)
    {
        //TODO:
    }


    private async void Button_Click_1(object sender, RoutedEventArgs e)
    {
        await Windows.Graphics.Printing.PrintManager.ShowPrintUIAsync();
    }
}