音频文件的FileSavePicker在Windows Phone 8.1通用应用程序中不工作
本文关键字:1通 应用程序 工作 Phone 文件 FileSavePicker Windows 音频 | 更新日期: 2023-09-27 18:03:01
我尝试了下面的代码,音频文件正在保存,但它显示0字节,我尝试了很多,如果有人知道这个,请帮助我…
WP8.1通用应用程序Mainpage.cs中的代码:
private async void pick_Click(object sender, RoutedEventArgs e)
{
string path = @"Assets'Audio'DeviPrasad.mp3";
StorageFolder folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
StorageFile file = await folder.GetFileAsync(path);
var st =await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
var size = st.Size;
FileSavePicker savePicker = new FileSavePicker();
//savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
savePicker.SuggestedSaveFile = file;
savePicker.FileTypeChoices.Add("MP3", new List<string>() { ".mp3" });
savePicker.ContinuationData.Add("SourceSound", path);
savePicker.SuggestedFileName = "DeviPrasad";
savePicker.PickSaveFileAndContinue();
}
internal async void ContinueFileOpenPicker(FileSavePickerContinuationEventArgs e)
{
var file = e.File;
var ff= file.Properties;
if(file!=null)
{
CachedFileManager.DeferUpdates(file);
await FileIO.WriteTextAsync(file, file.Name);
FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
}
}
app . example .cs中的代码:
protected async override void OnActivated(IActivatedEventArgs args)
{
var root = Window.Current.Content as Frame;
var mainPage = root.Content as MainPage;
if (mainPage != null && args is FileSavePickerContinuationEventArgs)
{
mainPage.ContinueFileOpenPicker(args as FileSavePickerContinuationEventArgs);
}
}
FileSavePicker不会帮助您将文件的内容写入或复制到目的地。
实际上,我认为你只是简单地从某个地方复制下面的代码,但不确切地知道它在做什么。
await FileIO.WriteTextAsync(file, file.Name);
这是写东西到文件,似乎是从一个样本,处理txt文件。对于你的情况,我们需要做以下的事情:
在pick_Click事件中将源文件路径添加到ContinuationData。将代码更改为:
savePicker.ContinuationData.Add("SourceSound", file.Path);
读取ContinueFileOpenPicker中的源文件路径和目标文件,写入如下内容:
var file = e.File; string soundPath = (string)e.ContinuationData["SourceSound"]; //var ff = file.Properties; if (file != null) { CachedFileManager.DeferUpdates(file); StorageFile srcFile = await StorageFile.GetFileFromPathAsync(soundPath); await srcFile.CopyAndReplaceAsync(file); FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file); }