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  • 微软实现的获取进程主窗口句柄代码

    public class MyProcess
    {
        private bool haveMainWindow = false;
        private IntPtr mainWindowHandle = IntPtr.Zero;
        private int processId = 0;
    
        private delegate bool EnumThreadWindowsCallback(IntPtr hWnd, IntPtr lParam);
    
        public IntPtr GetMainWindowHandle(int processId)
        {
            if (!this.haveMainWindow)
            {
                this.mainWindowHandle = IntPtr.Zero;
                this.processId = processId;
                EnumThreadWindowsCallback callback = new EnumThreadWindowsCallback(this.EnumWindowsCallback);
                EnumWindows(callback, IntPtr.Zero);
                GC.KeepAlive(callback);
    
                this.haveMainWindow = true;
            }
            return this.mainWindowHandle;
        }
    
        private bool EnumWindowsCallback(IntPtr handle, IntPtr extraParameter)
        {
            int num;
            GetWindowThreadProcessId(new HandleRef(this, handle), out num);
            if ((num == this.processId) && this.IsMainWindow(handle))
            {
                this.mainWindowHandle = handle;
                return false;
            }
            return true;
        }
    
        private bool IsMainWindow(IntPtr handle)
        {
            return (!(GetWindow(new HandleRef(this, handle), 4) != IntPtr.Zero) && IsWindowVisible(new HandleRef(this, handle)));
        }
    
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool EnumWindows(EnumThreadWindowsCallback callback, IntPtr extraData);
    
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern int GetWindowThreadProcessId(HandleRef handle, out int processId);
    
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern IntPtr GetWindow(HandleRef hWnd, int uCmd);
    
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool IsWindowVisible(HandleRef hWnd);
    }
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  • 原文地址:https://www.cnblogs.com/wuyaSama/p/1896445.html
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