Launcher.LaunchFileAsync 方法

参考

定义

命名空间:: Windows.System

重要

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重载

LaunchFileAsync(IStorageFile)	启动与指定文件关联的默认应用。
LaunchFileAsync(IStorageFile, LauncherOptions)	使用指定的选项启动与指定文件关联的默认应用。

LaunchFileAsync(IStorageFile)

编辑

启动与指定文件关联的默认应用。

public:
 static IAsyncOperation<bool> ^ LaunchFileAsync(IStorageFile ^ file);

/// [Windows.Foundation.Metadata.Overload("LaunchFileAsync")]
 static IAsyncOperation<bool> LaunchFileAsync(IStorageFile const& file);

[Windows.Foundation.Metadata.Overload("LaunchFileAsync")]
public static IAsyncOperation<bool> LaunchFileAsync(IStorageFile file);

function launchFileAsync(file)

Public Shared Function LaunchFileAsync (file As IStorageFile) As IAsyncOperation(Of Boolean)

参数

file: IStorageFile

文件。

IAsyncOperation<Boolean>

IAsyncOperation<bool>

启动操作。

属性: OverloadAttribute

示例

此示例使用 LaunchFileAsync (IStorageFile) 启动应用包中包含的文件。

async void DefaultLaunch()
{
   // Path to the file in the app package to launch
   string imageFile = @"images\test.png";

   var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(imageFile);

   if (file != null)
   {
      // Launch the retrieved file
      var success = await Windows.System.Launcher.LaunchFileAsync(file);

      if (success)
      {
         // File launched
      }
      else
      {
         // File launch failed
      }
   }
   else
   {
      // Could not find file
   }
}

Windows::Foundation::IAsyncAction MainPage::DefaultLaunch()
{
    // Get the app's installation folder.
    Windows::Storage::StorageFolder installFolder{ Windows::ApplicationModel::Package::Current().InstalledLocation() };

    Windows::Storage::StorageFile file{ co_await installFolder.GetFileAsync(L"Assets\\LockScreenLogo.scale-200.png") };

    if (file)
    {
        // Launch the retrieved file.
        bool success{ co_await Windows::System::Launcher::LaunchFileAsync(file) };
        if (success)
        {
            // File launched.
        }
        else
        {
            // File launch failed.
        }
    }
    else
    {
        // Couldn't find file.
    }
}

void MainPage::DefaultLaunch()
{
   auto installFolder = Windows::ApplicationModel::Package::Current->InstalledLocation;

   concurrency::task<Windows::Storage::StorageFile^> getFileOperation(installFolder->GetFileAsync("images\\test.png"));
   getFileOperation.then([](Windows::Storage::StorageFile^ file)
   {
      if (file != nullptr)
      {
         // Launch the retrieved file
         concurrency::task<bool> launchFileOperation(Windows::System::Launcher::LaunchFileAsync(file));
         launchFileOperation.then([](bool success)
         {
            if (success)
            {
               // File launched
            }
            else
            {
               // File launch failed
            }
         });
      }
      else
      {
         // Could not find file
      }
   });
}

async Sub DefaultLaunch()

   ' Path to the file in the app package to launch
   Dim imageFile = "images\test.png"

   Dim file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(imageFile)

   If file IsNot Nothing Then
      ' Launch the retrieved file
      Dim success = await Windows.System.Launcher.LaunchFileAsync(file)

      If success Then
         ' File launched
      Else
         ' File launch failed
      End If
   Else
      ' Could not find file
   End If
End Sub

注解

调用 API 时，调用应用必须对用户可见。

必须从 ASTA 线程 (也称为 UI 线程) 调用此 API。

此 API 还对其可以启动的文件类型施加了一些限制。阻止许多包含可执行代码的文件类型（例如，.exe、.msi 和 .js 文件）启动。此限制可保护用户免受可能修改系统的潜在恶意文件的侵害。

当启动因上述任何原因失败时，API 会成功，并从其异步操作中返回 FALSE。由于它无法查询上述限制是否适用于当前启动，因此调用应用不应假定启动成功，并且应在失败时提供回退机制。一种可能的解决方案是要求用户保存文件，并指示用户在桌面上打开它。

若要使用户能够选择应用而不是启动默认应用，请设置 LauncherOptions.DisplayApplicationPicker 属性。

若要显示文件可能不安全的警告，请设置 LauncherOptions.TreatAsUntrusted 属性。

文件将传递到关联的应用。如果关联的应用是桌面应用，则使用 shell 执行机制传递文件。

另请参阅

适用于

LaunchFileAsync(IStorageFile, LauncherOptions)

编辑

使用指定的选项启动与指定文件关联的默认应用。

public:
 static IAsyncOperation<bool> ^ LaunchFileAsync(IStorageFile ^ file, LauncherOptions ^ options);

/// [Windows.Foundation.Metadata.Overload("LaunchFileWithOptionsAsync")]
 static IAsyncOperation<bool> LaunchFileAsync(IStorageFile const& file, LauncherOptions const& options);

[Windows.Foundation.Metadata.Overload("LaunchFileWithOptionsAsync")]
public static IAsyncOperation<bool> LaunchFileAsync(IStorageFile file, LauncherOptions options);

function launchFileAsync(file, options)

Public Shared Function LaunchFileAsync (file As IStorageFile, options As LauncherOptions) As IAsyncOperation(Of Boolean)

参数

file: IStorageFile

文件。

options: LauncherOptions

应用的启动选项。

IAsyncOperation<Boolean>

IAsyncOperation<bool>

启动操作。

属性: OverloadAttribute

示例

调用 [Launcher.LaunchFileAsync (IStorageFile， LauncherOptions) 方法，并将 LauncherOptions.DisplayApplicationPicker 设置为 true ，以启动用户从“ 打开方式 ”对话框中为文件选择的应用。

async void DefaultLaunch()
{
   // Path to the file in the app package to launch
   string imageFile = @"images\test.png";

   var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(imageFile);

   if (file != null)
   {
      // Set the option to show the picker
      var options = new Windows.System.LauncherOptions();
      options.DisplayApplicationPicker = true;

      // Launch the retrieved file
      bool success = await Windows.System.Launcher.LaunchFileAsync(file, options);
      if (success)
      {
         // File launched
      }
      else
      {
         // File launch failed
      }
   }
   else
   {
      // Could not find file
   }
}

Windows::Foundation::IAsyncAction MainPage::DefaultLaunch()
{
    // Get the app's installation folder.
    Windows::Storage::StorageFolder installFolder{ Windows::ApplicationModel::Package::Current().InstalledLocation() };

    Windows::Storage::StorageFile file{ co_await installFolder.GetFileAsync(L"Assets\\LockScreenLogo.scale-200.png") };

    if (file)
    {
        // Set the option to show the picker.
        Windows::System::LauncherOptions launcherOptions;
        launcherOptions.DisplayApplicationPicker(true);

        // Launch the retrieved file.
        bool success{ co_await Windows::System::Launcher::LaunchFileAsync(file, launcherOptions) };
        if (success)
        {
            // File launched.
        }
        else
        {
            // File launch failed.
        }
    }
    else
    {
        // Couldn't find file.
    }
}

void MainPage::DefaultLaunch()
{
   auto installFolder = Windows::ApplicationModel::Package::Current->InstalledLocation;

   concurrency::task<Windows::Storage::StorageFile^> getFileOperation(installFolder->GetFileAsync("images\\test.png"));
   getFileOperation.then([](Windows::Storage::StorageFile^ file)
   {
      if (file != nullptr)
      {
         // Set the option to show the picker
         auto launchOptions = ref new Windows::System::LauncherOptions();
         launchOptions->DisplayApplicationPicker = true;

         // Launch the retrieved file
         concurrency::task<bool> launchFileOperation(Windows::System::Launcher::LaunchFileAsync(file, launchOptions));
         launchFileOperation.then([](bool success)
         {
            if (success)
            {
               // File launched
            }
            else
            {
               // File launch failed
            }
         });
      }
      else
      {
         // Could not find file
      }
   });
}

async Sub DefaultLaunch()

   ' Path to the file in the app package to launch
   Dim imageFile = "images\test.png"

   Dim file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(imageFile)

   If file IsNot Nothing Then
      ' Set the option to show the picker
      Dim options = Windows.System.LauncherOptions()
      options.DisplayApplicationPicker = True

      ' Launch the retrieved file
      Dim success = await Windows.System.Launcher.LaunchFileAsync(file, options)

      If success Then
         ' File launched
      Else
         ' File launch failed
      End If
   Else
      ' Could not find file
   End If
End Sub

注解

调用 API 时，调用应用必须对用户可见。

必须从 ASTA 线程内部调用此 API， (也称为 UI 线程) 。

若要使用户能够选择应用而不是启动默认应用，请设置 LauncherOptions.DisplayApplicationPicker 属性。

若要显示文件可能不安全的警告，请设置 LauncherOptions.TreatAsUntrusted 属性。

文件将传递到关联的应用。如果关联的应用是桌面应用，则使用 shell 执行机制传递文件。

另请参阅

适用于

通过

Launcher.LaunchFileAsync 方法

定义

重载

LaunchFileAsync(IStorageFile)

参数

返回

示例

注解

另请参阅

适用于

LaunchFileAsync(IStorageFile, LauncherOptions)

参数

返回

示例

注解

另请参阅

适用于

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