項目中遇到一些問題,需要根據權限配置去控制用戶對系統平臺是否可以最小化和還原窗口大小的操作,并且屏蔽系統的一些快捷鍵,比如:alt+F4,windows鍵,任務管理器等一些操作,代碼如下:

(禁止窗口最小化和還原(窗口啟動之后為最大化))

偷梁換柱(o(∩_∩)o 哈哈)

重寫WndProc方法:

const int SC_MINIMIZE = 0xF020;//窗體最小化消息
const int SC_MAXIMIZE = 0xF030;//窗體最大化消息
const int SC_NOMAL = 0xF120;//窗體還原消息
protected override void WndProc(ref Message m)
{

if (m.WParam.ToInt32() == SC_MINIMIZE)//點擊最小化
{

//還可以做些其它的操作
m.WParam = (IntPtr)SC_MAXIMIZE;
}
if (m.WParam.ToInt32() == SC_NOMAL)//點擊還原
{

　　　　//還可以做些點還原按鈕時其它的操作

m.WParam = (IntPtr)SC_MAXIMIZE;
}
base.WndProc(ref m);

}

下面是禁用快捷鍵的方法:

先寫一個鉤子的公用類,代碼如下:

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;
using System.Windows.Forms;
using System.Reflection;

namespace SISS.Client
{
public class KeyBoardHook
{
#region Delegates

public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);

#endregion

#region 變量聲明

private HookProc KeyboardHookProcedure;
private FileStream MyFs; // 用流來屏蔽ctrl alt delete

private const byte LLKHF_ALTDOWN = 0x20;//ALT
private const byte VK_ESCAPE = 0x1B;//ESC鍵
private const byte VK_F4 = 0x73;//F4健
private const byte VK_NUMLOCK = 0x90;//小鍵盤
private const byte VK_SHIFT = 0x10;//SHIFT鍵盤
private const byte VK_TAB = 0x09;//TAB鍵盤
public const int WH_KEYBOARD = 13;//獲得鍵盤
private const byte VK_RCONTROL = 0xA3;//CTRL鍵
private static int hKeyboardHook = 0;
#endregion

#region 對應COM的函數

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

//?卸載鉤子

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);

//?繼續下一個鉤子

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);

#endregion

#region 方法
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
KeyMSG m = (KeyMSG)Marshal.PtrToStructure(lParam, typeof(KeyMSG));

if (((Keys)m.vkCode == Keys.LWin || (Keys)m.vkCode == Keys.RWin)
|| ((m.vkCode == VK_TAB) && ((m.flags & LLKHF_ALTDOWN) != 0))//屏蔽alt+TAB
|| (m.vkCode == VK_F4) && ((m.flags & LLKHF_ALTDOWN) != 0)//屏蔽alt+F4
|| ((Keys)m.vkCode == Keys.LWin) && ((Keys)m.vkCode == Keys.D)//屏蔽windows+D鍵
|| ((Keys)m.vkCode == Keys.RWin) && ((Keys)m.vkCode == Keys.D)
|| (m.vkCode == VK_ESCAPE) && ((m.flags & LLKHF_ALTDOWN) != 0)//屏蔽alt+Esc
|| (m.vkCode == VK_RCONTROL) && (m.vkCode == VK_ESCAPE)//屏蔽Ctrl+Esc

)
{
return 1;
}

return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}
/// <summary>
/// 啟動鉤子
/// </summary>
public void HookStart()
{
if (hKeyboardHook == 0)
{
//?創建HookProc實例

KeyboardHookProcedure = new HookProc(KeyboardHookProc);

hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD,
KeyboardHookProcedure,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),
0);

//?如果設置鉤子失敗

if (hKeyboardHook == 0)
{
HookStop();
}

//用二進制流的方法打開任務管理器。而且不關閉流.這樣任務管理器就打開不了
MyFs = new FileStream(Environment.ExpandEnvironmentVariables("%windir%\\system32\\taskmgr.exe"),
FileMode.Open);
byte[] MyByte = new byte[(int)MyFs.Length];
MyFs.Write(MyByte, 0, (int)MyFs.Length);
}
}
/// <summary>
/// 卸載鉤子
/// </summary>
public void HookStop()
{
bool retKeyboard = true;

if (hKeyboardHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hKeyboardHook);

hKeyboardHook = 0;
}

if (null != MyFs)
{
MyFs.Close();
}

if (!(retKeyboard))
{
throw new Exception("卸載鉤子失敗");
}
}

#endregion

#region Nested type: KeyMSG

public struct KeyMSG
{
public int vkCode;//獲得鍵盤輸入的直
public int scanCode;
public int flags;//鍵盤的狀態
}

#endregion

?

}
}

再在窗口Load事件調用就OK了,關閉的時候一定要卸載鉤子,要不鍵盤快捷鍵還是不能用!

還需了解一些windows消息機制,消息數值在winuser.h頭文件中!

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