新手求指教 api调用

[masterGr]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;

namespace test
{
public partial class Form1 : Form
{
//委托
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)]
public string lpData;
}

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

static int hHook = 0;
public const int WH_KEYBOARD_LL = 13;
//LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。
HookProc KeyBoardHookProcedure;
//键盘Hook结构函数
[StructLayout(LayoutKind.Sequential)]
public class KeyBoardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
#region DllImport
//设置钩子
[DllImport("user32.dll")]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
//抽掉钩子
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);
//调用下一个钩子
[DllImport("user32.dll")]
public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);

[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();

[DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name);
#endregion

#region 自定义事件
public void Hook_Start()
{
// 安装键盘钩子
if (hHook == 0)
{
KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);

//hHook = SetWindowsHookEx(2,
// KeyBoardHookProcedure,
// GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());

hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure, GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
//如果设置钩子失败.
if (hHook == 0)
{
Hook_Clear();
//throw new Exception("设置Hook失败!");
}
}
}

//取消钩子事件
public void Hook_Clear()
{
bool retKeyboard = true;
if (hHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = 0;
}
//如果去掉钩子失败.
if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");
}
static int num = 0;
//这里可以添加自己想要的信息处理
public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode >= 0)
{
KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
if (kbh.vkCode != 0)
{
num++;
MessageBox.Show(kbh.vkCode + " "+num); }
return 0;
}
return CallNextHookEx(hHook, nCode, wParam, lParam);
}
#endregion

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
Hook_Start();
}

private void button2_Click(object sender, EventArgs e)
{
Hook_Clear();
}




}

}
vs调试时红色部分调用一次 不调试时调用两次

[bdmh]

按键消息，keydown，keyup都会触发的，你应该判断一下状态

if GetKeyState(wParam) < 0 then

GetKeyState原型 SHORT GetKeyState（int nVirtKey）；

http://blog.csdn.net/bdmh/article/details/6124127

[masterGr]

[Quote=引用 1 楼 bdmh 的回复:]

按键消息，keydown，keyup都会触发的，你应该判断一下状态

if GetKeyState(wParam) < 0 then

GetKeyState原型 SHORT GetKeyState（int nVirtKey）；

http://blog.csdn.net/bdmh/article/details/6124127
[/Quote]
那为什么调试时候显示一次啊