Metro style app 文件、文件夹的选择、文件的保存。

 

 Metro style app 文件、文件夹的选择、文件的保存。

 

1、选择单个文件

public async void PickAFile() {     FileOpenPicker openPicker = new FileOpenPicker();     openPicker.ViewMode = PickerViewMode.Thumbnail;     openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;     openPicker.FileTypeFilter.Add(".jpg");     openPicker.FileTypeFilter.Add(".jpeg");     openPicker.FileTypeFilter.Add(".png");     StorageFile file = await openPicker.PickSingleFileAsync();     if (file != null)     {         // Application now has read/write access to the picked file         msg = "Picked photo: " + file.Name;     }     else     {         msg = "Operation cancelled.";     } }

 

 

 

2、选择多个文件

public async void PickFiles() {     FileOpenPicker openPicker = new FileOpenPicker();     openPicker.ViewMode = PickerViewMode.List;     openPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;     openPicker.FileTypeFilter.Add("*");     IReadOnlyList<StorageFile> files = await openPicker.PickMultipleFilesAsync();     if (files.Count > 0)     {         StringBuilder output = new StringBuilder("Picked files:\n");         // Application now has read/write access to the picked file(s)         foreach (StorageFile file in files)         {             output.Append(file.Name + "\n");         }         msg = output.ToString();     } }

 

3、选择文件夹

public async void PickFolder() {     FolderPicker folderPicker = new FolderPicker();     folderPicker.SuggestedStartLocation = PickerLocationId.Desktop;     folderPicker.FileTypeFilter.Add(".docx");     folderPicker.FileTypeFilter.Add(".xlsx");     folderPicker.FileTypeFilter.Add(".pptx");     folderPicker.FileTypeFilter.Add(".jpg");     folderPicker.FileTypeFilter.Add(".jpeg");     StorageFolder folder = await folderPicker.PickSingleFolderAsync();     if (folder != null)     {         // Application now has read/write access to all contents in the picked folder (including other sub-folder contents)         StorageApplicationPermissions.FutureAccessList.AddOrReplace("PickedFolderToken", folder);         msg = "Picked folder: " + folder.Name;     }     else     {         msg = "Operation cancelled.";     }   }

 

 

4、保存文件

public async void SaveFile() {     FileSavePicker savePicker = new FileSavePicker();     savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;     // Dropdown of file types the user can save the file as     savePicker.FileTypeChoices.Add("Plain Text", new List<string>() { ".txt" });     // Default file name if the user does not type one in or select a file to replace     savePicker.SuggestedFileName = "New Document";     StorageFile file = await savePicker.PickSaveFileAsync();     if (file != null)     {         // Prevent updates to the remote version of the file until we finish making changes and call CompleteUpdatesAsync.         CachedFileManager.DeferUpdates(file);         // write to file         await FileIO.WriteTextAsync(file, file.Name);         // Let Windows know that we're finished changing the file so the other app can update the remote version of the file.         // Completing updates may require Windows to ask for user input.         FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);         if (status == FileUpdateStatus.Complete)         {             msg = "File " + file.Name + " was saved.";         }         else         {             msg = "File " + file.Name + " couldn't be saved.";         }     } }

 

下面是C++版本

1、选择单个文件 

void BasicHandleCPP::MainPage::PickerAFile_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e) {     FileOpenPicker^ openPicker = ref new FileOpenPicker();     openPicker->ViewMode = PickerViewMode::Thumbnail;     openPicker->SuggestedStartLocation = PickerLocationId::PicturesLibrary;     openPicker->FileTypeFilter->Append(".jpg");     openPicker->FileTypeFilter->Append(".jpeg");     openPicker->FileTypeFilter->Append(".png");       create_task(openPicker->PickSingleFileAsync()).then([this](StorageFile^ file)     {         if (file)         {             Display->Text = "Picked photo: " + file->Name;         }         else         {             Display->Text = "Operation cancelled.";         }     });   }

 

 

2、选择多个文件

void BasicHandleCPP::MainPage::PickerFiles_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e) {     FileOpenPicker^ openPicker = ref new FileOpenPicker();     openPicker->ViewMode = PickerViewMode::List;     openPicker->SuggestedStartLocation = PickerLocationId::DocumentsLibrary;     openPicker->FileTypeFilter->Append("*");       create_task(openPicker->PickMultipleFilesAsync()).then([this](IVectorView<StorageFile^>^ files)     {         if (files->Size > 0)         {             String^ output = "Picked files:\n";             std::for_each(begin(files), end(files), [this, &output](StorageFile ^file)             {                 output += file->Name + "\n";             });             Display->Text = output;         }         else         {             Display->Text = "Operation cancelled.";         }     }); }

 

 

3、选择文件夹

void BasicHandleCPP::MainPage::PickerFolder_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e) {     FolderPicker^ folderPicker = ref new FolderPicker();     folderPicker->SuggestedStartLocation = PickerLocationId::Desktop;       // Users expect to have a filtered view of their folders depending on the scenario.     // For example, when choosing a documents folder, restrict the filetypes to documents for your application.     folderPicker->FileTypeFilter->Append(".docx");     folderPicker->FileTypeFilter->Append(".xlsx");     folderPicker->FileTypeFilter->Append(".pptx");       create_task(folderPicker->PickSingleFolderAsync()).then([this](StorageFolder^ folder)     {         if (folder)         {             Display->Text = "Picked folder: " + folder->Name;         }         else         {             Display->Text = "Operation cancelled.";         }     }); }

 

4、保存文件

void BasicHandleCPP::MainPage::SaveFile_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e) {     FileSavePicker^ savePicker = ref new FileSavePicker();     savePicker->SuggestedStartLocation = PickerLocationId::DocumentsLibrary;       auto plainTextExtensions = ref new Platform::Collections::Vector<String^>();     plainTextExtensions->Append(".txt");     savePicker->FileTypeChoices->Insert("Plain Text", plainTextExtensions);     savePicker->SuggestedFileName = "New Document";       create_task(savePicker->PickSaveFileAsync()).then([this](StorageFile^ file)     {         if (file != nullptr)         {               // Prevent updates to the remote version of the file until we finish making changes and call CompleteUpdatesAsync.             CachedFileManager::DeferUpdates(file);             // write to file             create_task(FileIO::WriteTextAsync(file, file->Name)).then([this, file]()             {                 // Let Windows know that we're finished changing the file so the other app can update the remote version of the file.                 // Completing updates may require Windows to ask for user input.                 create_task(CachedFileManager::CompleteUpdatesAsync(file)).then([this, file](FileUpdateStatus status)                 {                     if (status == FileUpdateStatus::Complete)                     {                         Display->Text = "File " + file->Name + " was saved.";                     }                     else                     {                         Display->Text = "File " + file->Name + " couldn't be saved.";                     }                 });             });         }         else         {             Display->Text = "Operation cancelled.";         }     }); }

 

 

 

 

 

 

 本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2012/06/28/2567009.html，如需转载请自行联系原作者