UWP 共享文件——接收者
UWP上共享,分为接收者(别人共享数据给你,你接收了,然后在做你的处理)和发送者(你给别人发送数据,就像你的App支持图片共享到微信好友或者朋友圈那样,虽然UWP上的微信并不支持这样子)
很简单(参考Windows on Github\Windows-universal-samples\Samples\ShareTarget)
1、先滚进包清单声明,添加共享目标。再选择你App准备接受的数据格式。
如果你的App只接收图像,就填写一个Bitmap了啦
2、然后滚进App.xaml.cs,重写OnShareTargetActivated
一般建议导航到一个ReceivedSharePage页面来处理,并把 ShareOperation 对象作为附加参数传过去,再在页面上接收这个对象实例。
protected override void OnShareTargetActivated(ShareTargetActivatedEventArgs args) { var rootFrame = Window.Current.Content as Frame; if (rootFrame == null) { rootFrame = new Frame(); Window.Current.Content = rootFrame; } rootFrame.Navigate(typeof(ReceivedSharePage), args.ShareOperation); Window.Current.Activate(); }
3、在ReceivedSharePage的后台,重写 OnNavigatedTo 方法,可以获取导航时传递的参数。
前台放一个Image,显示数据
正如我第一步设置的,我的App可以接受图像Bitmap和文件StorageItems两种,所以在代码里面都要处理一下子的。
private ShareOperation shareOperation; private IRandomAccessStreamReference sharedBitmapStreamRef; private IReadOnlyList<IStorageItem> sharedStorageItems; protected override async void OnNavigatedTo(NavigationEventArgs e) { // It is recommended to only retrieve the ShareOperation object in the activation handler, return as // quickly as possible, and retrieve all data from the share target asynchronously. this.shareOperation = (ShareOperation)e.Parameter; await Task.Factory.StartNew(async () => { // Retrieve the data package content. // The GetWebLinkAsync(), GetTextAsync(), GetStorageItemsAsync(), etc. APIs will throw if there was an error retrieving the data from the source app. // In this sample, we just display the error. It is recommended that a share target app handles these in a way appropriate for that particular app. if (this.shareOperation.Data.Contains(StandardDataFormats.Bitmap)) { try { this.sharedBitmapStreamRef = await this.shareOperation.Data.GetBitmapAsync(); } catch (Exception ex) { textResult.Text = "Failed GetBitmapAsync - " + ex.Message; } } if (this.shareOperation.Data.Contains(StandardDataFormats.StorageItems)) { try { this.sharedStorageItems = await this.shareOperation.Data.GetStorageItemsAsync(); } catch (Exception ex) { textResult.Text = "Failed GetBitmapAsync - " + ex.Message; } } // In this sample, we just display the shared data content. // Get back to the UI thread using the dispatcher. await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () => { if (this.sharedBitmapStreamRef != null) { IRandomAccessStreamWithContentType bitmapStream = await this.sharedBitmapStreamRef.OpenReadAsync(); BitmapImage bitmapImage = new BitmapImage(); bitmapImage.SetSource(bitmapStream); imgReceived.Source = bitmapImage; textResult.Text = "Click OK to continue :)"; //写入记忆文件的位置 (Application.Current as App).localSettings.Values["LastFile"] = this.sharedStorageItems[0].Path; } else if (this.sharedStorageItems != null) { try { StorageFile file = await StorageFile.GetFileFromPathAsync(this.sharedStorageItems[0].Path); IRandomAccessStreamWithContentType bitmapStream = await file.OpenReadAsync(); BitmapImage bitmapImage = new BitmapImage(); bitmapImage.SetSource(bitmapStream); imgReceived.Source = bitmapImage; textResult.Text = "Click OK to continue :)"; //写入记忆文件的位置 (Application.Current as App).localSettings.Values["LastFile"] = this.sharedStorageItems[0].Path; } catch { textResult.Text = "Sorry, your shared content is not a standard image file :("; } } }); }); }
4、在处理完成时,你需要调用 ReportCompleted 方法,这个不能少,因为这个方法会告诉系统,你的程序已经处理完共享数据了,这时候共享面板会关闭。
(Exif里面并没有这么做,而是把数据传给了ImageExifPage页面,用来分析图像数据了)
5、测试
找一个App,可以向外共享数据的,比如系统的图片App,或者微软给的sample/ShareSource App
选择图片
【Attention!!!通过图片App发送出来的数据,并不是Bitmap格式,而是作为文件StorageItems格式发送出去了。。。。。。一开始我老是纳闷,用Bitmap咋收不到图片,mmp。。。。。。用ShareSource App可以有很多种选择啦】
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