在Windows IoT 10 Core上使用UWP创建物理文件

时间:2019-02-18 15:22:54

标签: uwp windows-10-iot-core

我尝试使用以下代码在具有Windows IoT 10核心的设备操作系统中创建一些物理文件:

StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);

try
{
    StorageFile file = await storageFolder.CreateFileAsync("robodem.log", CreationCollisionOption.ReplaceExisting);

    using (Stream fileStream = await file.OpenStreamForWriteAsync())
    using (var streamWriter = new StreamWriter(fileStream))
    {
        streamWriter.Write("test");
    }

    onMessageOccured(Severity.Success, "Done");
}
catch (Exception ex)
{
    onMessageOccured(Severity.Error, ex.Message);
}

但是,当我使用以下命令搜索文件时,我没有任何异常:

Get-Childitem –Path c:\ -Include robodem.log -Directory -Recurse -ErrorAction SilentlyContinue

我找不到它。

此外,storageFolder.Attributes等于FileAttributes.Archive

如果我使用:

StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);

try
{
    using(FileStream stream = new FileStream("c:\\robodem.log", FileMode.OpenOrCreate))
    using (StreamWriter streamWriter = new StreamWriter(stream))
    {
        streamWriter.Write("test");
    }

    onMessageOccured(Severity.Success, "Done Base");
}
catch (Exception ex)
{
    onMessageOccured(Severity.Error, ex.Message);
}

我收到此异常:

  

拒绝访问路径'c:\ robodem.log'。

这是Package.appxmanifest的配置:

<Capabilities>
    <Capability Name="internetClient" />
    <uap:Capability Name="musicLibrary" />
    <uap:Capability Name="removableStorage" />
    <uap:Capability Name="picturesLibrary" />
    <uap:Capability Name="videosLibrary" />
    <uap:Capability Name="documentsLibrary" />
    <DeviceCapability Name="webcam" />
    <DeviceCapability Name="serialcommunication">
      <Device Id="any">
        <Function Type="name:serialPort" />
      </Device>
    </DeviceCapability>
</Capabilities>

如何创建物理文件以将日志信息写入并进一步读取?

1 个答案:

答案 0 :(得分:2)

您的代码正确。

您可以使用file.Path来获取文件路径。通过Visual Studio部署UWP应用程序时,它使用DefaultAccount用户。因此文件路径为C:\Data\Users\DefaultAccount\Pictures\robodem.log

System.Diagnostics.Debug.WriteLine(file.Path);

并使用-File代替-Directory,然后删除-ErrorAction SilentlyContinue。因此,请尝试以下命令:Get-Childitem -Path c:\ -Include robodem.log -file -Recurse

  

拒绝访问路径'c:\ robodem.log'。

Universal Windows Apps不能访问您设备上的所有文件夹。请参阅File access permissions