FileSavePicker如何指定筛选器？（C++）

Question

我希望让FileSavePicker打开一些文件，包括：

“.jpg”

".txt"

如何编程？必须是C++。

Answer 1

其中主要是如何定义筛选器，我的代码是：

auto Picker = ref new Windows::Storage::Pickers::FileSavePicker();
Picker->FileTypeChoices->Insert();//这句代码怎么写？
create_task(Picker->PickSaveFileAsync()).then([this](Windows::Storage::StorageFile^ file){
//省略
});

Answer 2

首先，FileOpenPicker是用来打开文件，FileSavePicker是用来保存文件。

那么我就当你问的是FileOpenPicker（其实FileSavePicker原理是一样的），

	auto picker = ref new FileOpenPicker();
	picker->ViewMode = PickerViewMode::List;
	picker->SuggestedStartLocation = PickerLocationId::DocumentsLibrary;
	picker->FileTypeFilter->Append(".txt");
	picker->FileTypeFilter->Append(".jpg");

	task<StorageFile^> m_pickFileTask(picker->PickSingleFileAsync());
	m_pickFileTask.then([this](StorageFile^ file)
	{
		//do something here.
		String^ fileName = file->DisplayName->ToString();
	});

--James

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Answer 3

FileSavePicker好像没有Append，这就是我需要问的关键。

Answer 4

我用的这个办法：

	auto plainTextExtensions = ref new Platform::Collections::Vector<String^>();
	plainTextExtensions->Append(".txt");
	picker->FileTypeChoices->Insert("PlainText", plainTextExtensions);

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Answer 5

完全成功