C#利用Windows API隐藏windows窗体

最新推荐文章于 2025-06-11 12:41:07 发布

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最新推荐文章于 2025-06-11 12:41:07 发布

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分类专栏： .NET组件程序设计代码

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本文介绍如何在C#中利用Windows API来隐藏和显示指定进程的窗体。通过`GetWindowText`、`GetClassName`、`WindowFromPoint`等API获取窗体句柄，并使用`ShowWindow`方法进行隐藏和显示操作。示例代码包含`GetMainWindowHandle`和`GetProcessPID`方法，用于根据进程ID找到窗体并执行相关操作。

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在GetProcessPID()方法中，修改进程名，就可以实现关闭窗体功能。

本程序经过.Net 4.0调试通过，操作系统平台Windows Server 2008 R2

public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        // 获取窗口标题
        [DllImport("user32", SetLastError = true)]
        public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount
        );

        //获取类的名字
        [DllImport("user32.dll")]
        private static extern int GetClassName(
        IntPtr hWnd,
        StringBuilder lpString,
        int nMaxCount
        );

        //根据坐标获取窗口句柄
        [DllImport("user32")]
        private static extern IntPtr WindowFromPoint(
        Point Point
        );

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        // 隐藏窗口
        public const int SW_HIDE = 0;
        public const int SW_SHOWNORMAL = 1;
        public const int SW_NORMAL = 1;
        public const int SW_SHOWMINIMIZED = 2;
        public const int SW_SHOWMAXIMIZED = 3;
        public const int SW_MAXIMIZE = 3;
        public const int SW_SHOWNOACTIVATE = 4;
        public const int SW_SHOW = 5;
        public const int SW_MINIMIZE = 6;
        public const int SW_SHOWMINNOACTIVE = 7;
        public const int SW_SHOWNA = 8;
        public const int SW_RESTORE = 9;
        public const int SW_SHOWDEFAULT = 10;
        public const int SW_FORCEMINIMIZE = 11;
        public const int SW_MAX = 11;
        
        private void button2_Click(object sender, EventArgs e)
        {
            IntPtr formHandle = GetMainWindowHandle(GetProcessPID());
            ShowWindow(formHandle, SW_HIDE);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            IntPtr formHandle = GetMainWindowHandle(GetProcessPID());
            ShowWindow(formHandle, SW_SHOW);
        }

        private static class NativeMethods
        {
            internal const uint GW_OWNER = 4;

            internal delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern int GetWindowThreadProcessId(IntPtr hWnd, out IntPtr lpdwProcessId);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern bool IsWindowVisible(IntPtr hWnd);
        }

        /// <summary>
        /// 通过进程PID取得窗体句柄
        /// </summary>
        /// <param name="processId"></param>
        /// <returns></returns>
        public static IntPtr GetMainWindowHandle(int processId)
        {
            IntPtr MainWindowHandle = IntPtr.Zero;

            NativeMethods.EnumWindows(new NativeMethods.EnumWindowsProc((hWnd, lParam) =>
            {
                IntPtr PID;
                NativeMethods.GetWindowThreadProcessId(hWnd, out PID);

                if (PID == lParam &&
                    NativeMethods.IsWindowVisible(hWnd) &&
                    NativeMethods.GetWindow(hWnd, NativeMethods.GW_OWNER) == IntPtr.Zero)
                {
                    MainWindowHandle = hWnd;
                    return false;
                }

                return true;

            }), new IntPtr(processId));

            return MainWindowHandle;
        }

        /// <summary>
        /// 通过进程名取得进程PID
        /// </summary>
        /// <returns></returns>
        private int GetProcessPID()
        {
            try
            {
                //进程名称不要加上.exe
                System.Diagnostics.Process[] processes = System.Diagnostics.Process.GetProcessesByName("communicator");
                if (processes != null && processes.Length != 0)
                {
                    return processes[0].Id;
                }

                throw new Exception();
            }
            catch (Exception ex)
            {
                throw ex;   
            }
        }
    }