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Launcher.LaunchFileAsync Method

  • Reference

Definition

Namespace:
Windows.System

Overloads

LaunchFileAsync(IStorageFile)

Starts the default app associated with the specified file.
LaunchFileAsync(IStorageFile, LauncherOptions)

Starts the default app associated with the specified file, using the specified options.

LaunchFileAsync(IStorageFile)

Edit

Starts the default app associated with the specified file.

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)

Parameters

file
IStorageFile

The file.

Returns

IAsyncOperation<Boolean>

IAsyncOperation<bool>

The launch operation.

Attributes
OverloadAttribute

Examples

This example uses LaunchFileAsync(IStorageFile) to launch a file contained in the app package.

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

Remarks

The calling app must be visible to the user when the API is invoked.

This API must be called from an ASTA thread (also known as a UI thread).

This API also imposes several restrictions on what types of files it can launch. Many file types that contain executable code, for example .exe, .msi, and .js files, are blocked from launching. This restriction protects users from potentially malicious files that could modify the system.

When the launch fails for any of the above reasons, the API succeeds and returns FALSE from its asynchronous operation. Since it has no ability to query whether the above restrictions apply to the current launch, the calling app should not assume that the launch succeeded, and should provide fallback mechanism in case it failed. A possible solution would be to ask the user to save the file and direct the user to open it in the desktop.

To enable the user to choose an app instead of launching the default app, set the LauncherOptions.DisplayApplicationPicker property.

To display a warning that the file is potentially unsafe, set the LauncherOptions.TreatAsUntrusted property.

The file is passed to the associated app. If the associated app is a desktop app, the file is passed using shell execution mechanisms.

See also

Applies to

LaunchFileAsync(IStorageFile, LauncherOptions)

Edit

Starts the default app associated with the specified file, using the specified options.

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)

Parameters

file
IStorageFile

The file.

options
LauncherOptions

The launch options for the app.

Returns

IAsyncOperation<Boolean>

IAsyncOperation<bool>

The launch operation.

Attributes
OverloadAttribute

Examples

Call the [Launcher.LaunchFileAsync(IStorageFile, LauncherOptions) method with LauncherOptions.DisplayApplicationPicker set to true to launch the app that the user selects for the file from the Open With dialog box.

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

Remarks

The calling app must be visible to the user when the API is invoked.

This API must be called from within an ASTA thread (also known as a UI thread).

This API also imposes several restrictions on what types of files it can launch. Many file types that contain executable code, for example .exe, .msi, and .js files, are blocked from launching. This restriction protects users from potentially malicious files that could modify the system.

When the launch fails for any of the above reasons, the API succeeds and returns FALSE from its asynchronous operation. Since it has no ability to query whether the above restrictions apply to the current launch, the calling app should not assume that the launch succeeded, and should provide fallback mechanism in case it failed. A possible solution would be to ask the user to save the file and direct the user to open it in the desktop.

To enable the user to choose an app instead of launching the default app, set the LauncherOptions.DisplayApplicationPicker property.

To display a warning that the file is potentially unsafe, set the LauncherOptions.TreatAsUntrusted property.

The file is passed to the associated app. If the associated app is a desktop app, the file is passed using shell execution mechanisms.

See also

Applies to