防止形式做事

Question

我希望我的表单 frmMainMenu 禁用东西。我做的第一件事是将其设置为maximized 并删除控制上的minimize & maximize。当我拖动表单时它会自动minimized，当我双击controlBox 它也是minimize。我还希望表单能够阻止movement。最后我想在我的表单上禁用alt + tab。

我这里有一些禁用移动的代码。

protected override void WndProc(ref Message message)
    {
        const int WM_SYSCOMMAND = 0x0112;
        const int SC_MOVE = 0xF010;
        switch (message.Msg)
        {
            case WM_SYSCOMMAND:
                int command = message.WParam.ToInt32() & 0xfff0;
                if (command == SC_MOVE)
                    return;
                break;
        }

        base.WndProc(ref message);
    }

这里是双击

 private const int WM_NCLBUTTONDBLCLK = 0x00A3; 

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_NCLBUTTONDBLCLK)
        {
            m.Result = IntPtr.Zero;
            return;
        }
        base.WndProc(ref m);
    }

我没有drag 和alt + tab 的代码，我不能把这两个放在我的表单中，因为它们有相同的参数WndProc。

Answer 1

执行以下步骤：

1. 创建Form
2. 将FormBorderStyle设置为FixedSingle
3. 将MinimizeBox 设置为false
4. 将MaximizeBox 设置为false
5. 将TopMost 设置为true
6. 处理表单的Load、FormClosing 和DeActivate 事件。
7. 在你的表单类中写下这段代码：

代码：

public partial class Form1: Form
{
    public Form1()
    {
        InitializeComponent();
    }

    // Structure contain information about low-level keyboard input event 
    [StructLayout(LayoutKind.Sequential)]
    private struct KBDLLHOOKSTRUCT
    {
        public Keys key;
        public int scanCode;
        public int flags;
        public int time;
        public IntPtr extra;
    }
    //System level functions to be used for hook and unhook keyboard input  
    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int id, LowLevelKeyboardProc callback, IntPtr hMod, uint dwThreadId);
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern bool UnhookWindowsHookEx(IntPtr hook);
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr CallNextHookEx(IntPtr hook, int nCode, IntPtr wp, IntPtr lp);
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string name);
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    private static extern short GetAsyncKeyState(Keys key);
    //Declaring Global objects     
    private IntPtr ptrHook;
    private LowLevelKeyboardProc objKeyboardProcess;

    private IntPtr captureKey(int nCode, IntPtr wp, IntPtr lp)
    {
        if (nCode >= 0)
        {
            KBDLLHOOKSTRUCT objKeyInfo = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lp, typeof(KBDLLHOOKSTRUCT));

            // Disabling Windows keys 

            if (objKeyInfo.key == Keys.RWin || objKeyInfo.key == Keys.LWin || objKeyInfo.key == Keys.Tab && HasAltModifier(objKeyInfo.flags) || objKeyInfo.key == Keys.Escape && (ModifierKeys & Keys.Control) == Keys.Control)
            {
                return (IntPtr)1; // if 0 is returned then All the above keys will be enabled
            }
        }
        return CallNextHookEx(ptrHook, nCode, wp, lp);
    }

    bool HasAltModifier(int flags)
    {
        return (flags & 0x20) == 0x20;
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        ProcessModule objCurrentModule = Process.GetCurrentProcess().MainModule;
        objKeyboardProcess = new LowLevelKeyboardProc(captureKey);
        ptrHook = SetWindowsHookEx(13, objKeyboardProcess, GetModuleHandle(objCurrentModule.ModuleName), 0);
    }
    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        e.Cancel = true;
    }

    protected override void WndProc(ref Message message)
    {
        const int WM_SYSCOMMAND = 0x0112;
        const int SC_MOVE = 0xF010;

        switch (message.Msg)
        {
            case WM_SYSCOMMAND:
                int command = message.WParam.ToInt32() & 0xfff0;
                if (command == SC_MOVE)
                    return;
                break;
        }

        base.WndProc(ref message);
    }
    private void Form1_Deactivate(object sender, EventArgs e)
    {
        this.Activate();
    }
}

注意事项：

• 禁用Win和Alt + Tab的代码取自this post，感谢作者。

• 防止移动的代码，取自this post，感谢作者。

• 不要忘记添加使用：

用途：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;