Question

错误属性＆＃39; DllImport＆＃39;对此声明类型无效。它仅适用于＆＃39;方法＆＃39;声明。试图在方法中在类之前添加dll导入但是同样的错误。

using System;
using System.Collections.Generic;
using System.Text;
using System.Management;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace MinimizeCapture
{

    class WatchForWindow
    {
        [DllImport("user32.dll")]
        private const int SW_SHOWNORMAL = 1;
        private const int SW_SHOWMINIMIZED = 2;
        private const int SW_SHOWMAXIMIZED = 3;

        private static ManagementEventWatcher watcher = null;

        public static void StartWatching()
        {
            WqlEventQuery query = new WqlEventQuery("Select * From __InstanceCreationEvent Within 2 Where TargetInstance Isa 'Win32_Process'");
            watcher = new ManagementEventWatcher(query);
            watcher.EventArrived += new EventArrivedEventHandler(watcher_EventArrived);
            watcher.Start();
        }

        public static void StopWatching()
        {
            if (watcher != null)
            {
                watcher.Stop();
            }
        }

        private static void watcher_EventArrived(object sender, EventArrivedEventArgs e)
        {
            ManagementBaseObject obj = (ManagementBaseObject)e.NewEvent["TargetInstance"];
            string t = obj["Name"].ToString();
            GetHWND(t);
        }

        private static void GetHWND(string wName)
        {
            IntPtr hWnd = FindWindow("Notepad", "Untitled - Notepad");

        }
    }
}

错误在这一行：

[DllImport("user32.dll")]

我试图使用它，因为FindWindow不存在。

Answer 1

您必须在没有正文的方法声明中应用[DllImport]属性，并带有static extern修饰符。

您可以在需要时查找translated function declarations on PInvoke.net，包括相关结构。您需要的函数FindWindow如下所示：

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

我试图在我的新课程中使用dll导入，但是获取错误属性＆＃39; DllImport＆＃39;对此声明类型无效

1 个答案: