[UWP] [C ++]如何使用C ++从UWP中的计算机中的任何位置读取文件

问题描述

我正在开发一个UWP，我需要在其中显示可以在用户计算机的任何位置分配的视频。我正在使用C ++作为主代码。为了做到这一点，我首先进入了Package.appxmanifest的代码并引入了下一行：

I am working on a UWP in which I am required to display videos that could be allocated anywhere in the user's computer. I am using C++ for the maincode. To do this first I went inside the code of Package.appxmanifest and introduced the next lines:

xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"

IgnorableNamespaces="uap mp rescap"

<Capabilities>

    <rescap:Capability Name="broadFileSystemAccess" />

</Capabilities>

使用broadFileSystemAccess我应该有权从用户计算机上的任何地方打开文件（或者我仍在使用在开发中）尝试这样做我遵循这种方法：

Using broadFileSystemAccess I should have permission to open a file from anywhere on the user's computer (or mine as I am still in development) to try and do this I follow this approach:

FileOpenPicker^ fop = ref new FileOpenPicker();
fop->SuggestedStartLocation = PickerLocationId::Desktop;
fop->FileTypeFilter->Append(".mp4");
fop->FileTypeFilter->Append(".wmv");
Platform::String^ folderP = folder->Path;
		
create_task(fop->PickSingleFileAsync()).then([this](StorageFile^ file) {
	if (file)
	{
		Platform::String^ path = file->Path;
		_media->Source = ref new Uri(file->Path);
        }
        else{
        Text1->Text="Operation cancelled";
        }
});

其中_media是我声明的MediaElement在我的XAML中。我应该改变什么才能工作？如果我在TextBox上打印文件的路径，结果是正确的，但不知道它不被接受为Uri。

Where _media is a MediaElement that I declare in my XAML. What should I change for this to work? If I print on a TextBox the path of the file the result is correct but somehow it isn't accepted as an Uri.

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