使用 C# .net framwork 4.7.2 中的 FileOpenPicker

Question

我正在尝试使用 Microsoft.Windows.SDK.Contracts 从 .net 框架 WFP 应用程序访问 Windows10 API。我想使用 FileOpenPicker() 选择图像以供 Windows.Media.Ocr 进行 OCR 处理。但我在使用选择器时遇到了“无效窗口句柄”错误

因为 FileOpenPicker 在当前线程上寻找 CoreWindow 作为对话框的所有者。但我们是一个没有 CoreWindow 的 Win32 桌面应用程序。” 我认为根本原因是一样的。但我不知道如何从基于 .net 框架端的代码中修复。

public async void Load()

{

    var picker = new FileOpenPicker()

    {

        SuggestedStartLocation = PickerLocationId.PicturesLibrary,

        FileTypeFilter = { ".jpg", ".jpeg", ".png", ".bmp" },

    };

    var file = await picker.PickSingleFileAsync();

    if (file != null)

    {

    }

    else

    {

    }

}

错误消息：System.Exception：“窗口句柄无效。（来自 HRESULT 的异常：0x80070578）”

Answer 1

创建一个文件：using System;using System.Runtime.InteropServices;namespace <standardnamespace>{&nbsp; &nbsp; [ComImport]&nbsp; &nbsp; [Guid("3E68D4BD-7135-4D10-8018-9FB6D9F33FA1")]&nbsp; &nbsp; [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]&nbsp; &nbsp; public interface IInitializeWithWindow&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; void Initialize(IntPtr hwnd);&nbsp; &nbsp; }}将您的代码更改为：public async void Load(){&nbsp; &nbsp; var picker = new FileOpenPicker()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; SuggestedStartLocation = PickerLocationId.PicturesLibrary,&nbsp; &nbsp; &nbsp; &nbsp; FileTypeFilter = { ".jpg", ".jpeg", ".png", ".bmp" },&nbsp; &nbsp; };&nbsp; &nbsp; ((IInitializeWithWindow)(object)picker).Initialize(System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle);&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; var file = await picker.PickSingleFileAsync();&nbsp; &nbsp; if (file != null)&nbsp; &nbsp; {&nbsp; &nbsp; }&nbsp; &nbsp; else&nbsp; &nbsp; {&nbsp; &nbsp; }}