在 C# 中使用 user32.dll 的问题(错误 1008 尝试引用不存在的令牌.) [英] Problem Using user32.dll in C# (Error 1008 An attempt was made to reference a token that does not exist.)

问题描述

你好传奇程序员.

通过我的上一个问题 我尝试在 C# 语言的 windows 通用应用程序 (UWP) 中使用 user32.dll，但在尝试时遇到错误使用我从 .dll

Flowing by my previous question I tried to use user32.dll in windows universal application (UWP) in C# language but I encountered an error while trying to use the method I imported from that .dll

这是我的代码:

[DllImport("user32.dll")]
public static extern bool LockWorkStation();
private async void btnLock_Click(object sender, RoutedEventArgs e)
{
    string path;
    if (Images.TryGetValue(selectedRadioButton.Name, out path))
    {
        StorageFile file = await StorageFile.GetFileFromPathAsync(path);
        await LockScreen.SetImageFileAsync(file);
        if (!LockWorkStation())
            throw new Exception(Marshal.GetLastWin32Error().ToString());
    }
}

如您所见，我从 user32.dll 导入了 LockWorkStation() 方法，并在按钮的事件侦听器中使用了它.Images 是一个 Dictionary 并且每件事都是 Fine 除非调用方法 LockWorkStation()> 它总是返回 false，所以抛出的错误是 1008 我在 Title 中提到过 问题是 为什么? 和 怎么能我分配一个令牌?

as you can see I imported LockWorkStation() mthod from user32.dll and I used it in the event listener of a button. the Images is a Dictionary<string,string> and every thing is Fine unless the call to method LockWorkStation() it always return false and so the thrown error is 1008 I mentioned it in the Title The question is Why? and how can I assign a token?

注意:任何方式，任何方式锁定屏幕都是令人钦佩的.

Note: any way,any way to lock the screen is admirable.

推荐答案

所以在搜索了很多并且无法从通用 Windows 应用程序平台直接锁定屏幕后，我向本地 Web 服务器发送了一个 Web 请求，然后我做了那个Web 服务器使用 user32.dll 并锁定屏幕.

So after searching a lot and being hopeless from directly lock the screen from the universal windows application platform I send a web request to a local web server and I made that web server to use the user32.dll and lock the screen.

这是 UWP 应用中的代码:

here is the code in the UWP app:

       try
               {
                   HttpClient httpClient = new HttpClient();
                   Uri uri = new Uri("http://localhost:8080/lock/");

                   HttpStringContent content = new HttpStringContent(
                       "{ \"pass\": \"theMorteza@1378App\" }",
                       UnicodeEncoding.Utf8,
                       "application/json");

                   HttpResponseMessage httpResponseMessage = await httpClient.PostAsync(
                       uri,
                       content);

                   httpResponseMessage.EnsureSuccessStatusCode();
               }
               catch (Exception ex)
               {
                   throw ex;
               }

Web 服务器中有代码:

and there is the code in the web server:

        [DllImport("user32.dll")]
        public static extern bool LockWorkStation();
        private static string LockTheScreen(HttpListenerRequest request)
        {
            var inputStream = request.InputStream;
            try
            {

                using (StreamReader sr = new StreamReader(inputStream))
                {
                    JToken pass = JToken.Parse(sr.ReadToEnd());
                    if (pass.Value<string>("pass") == "theMorteza@1378App")
                    {
                        LockWorkStation();
                    }
                }
            }
            catch (Exception)
            {

                return "fail";
            }
            return "fail";
        }

注意:您可以找到如何制作一个简单的网络服务器 这里
但是:您必须安装网络服务器并授予用户访问权限.

Note: you can find how to make a simple web server here
But: you must install the web server and grant it's access for users.

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