为什么我调用时HookStart()总是返回0,请高手指教using System;
using System.Runtime.InteropServices;
using System.IO;
using System.Reflection;
using System.Windows.Forms;
namespace HookTest
{
/// <summary>
/// Hook 的摘要说明。
/// </summary>
public class Hook
{
public Hook()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
// 安装钩子
public const int WH_KEYBOARD = 13;
public const int WH_MOUSE_LL = 14;
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
// 卸载钩子
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);
// 继续下一个钩子
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
// 取得当前线程编号
[DllImport("kernel32.dll")]
static extern int GetCurrentThreadId();
//定义委托
public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
static int hKeyboardHook = 0;
HookProc KeyboardHookProcedure;
//处理
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
KeyMSG m = (KeyMSG) Marshal.PtrToStructure(lParam, typeof(KeyMSG));
if ((int) m.vkCode == 91)
{
//textbox1.Text = “A”
//MessageBox.Show(wParam.ToString(),"dd");
return 1;
}
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}
// 安装钩子
public void HookStart()
{
if(hKeyboardHook == 0)
{
// 创建HookProc实例
KeyboardHookProcedure = new HookProc(KeyboardHookProc);
// 设置线程钩子
//hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD, KeyboardHookProcedure, IntPtr.Zero,
// GetCurrentThreadId());
hKeyboardHook = SetWindowsHookEx( WH_KEYBOARD,KeyboardHookProcedure,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),0);
// 如果设置钩子失败
if(hKeyboardHook == 0 )
{
HookStop();
throw new Exception("SetWindowsHookEx failedeeeeeeee.");
}
}
}
// 卸载钩子
public void HookStop()
{
bool retKeyboard = true;
if(hKeyboardHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
hKeyboardHook = 0;
}
if (!(retKeyboard))
{
throw new Exception("UnhookWindowsHookEx failedsssss.");
}
}
public struct KeyMSG
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
}
}
using System.Runtime.InteropServices;
using System.IO;
using System.Reflection;
using System.Windows.Forms;
namespace HookTest
{
/// <summary>
/// Hook 的摘要说明。
/// </summary>
public class Hook
{
public Hook()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
// 安装钩子
public const int WH_KEYBOARD = 13;
public const int WH_MOUSE_LL = 14;
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
// 卸载钩子
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);
// 继续下一个钩子
[DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
// 取得当前线程编号
[DllImport("kernel32.dll")]
static extern int GetCurrentThreadId();
//定义委托
public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
static int hKeyboardHook = 0;
HookProc KeyboardHookProcedure;
//处理
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
KeyMSG m = (KeyMSG) Marshal.PtrToStructure(lParam, typeof(KeyMSG));
if ((int) m.vkCode == 91)
{
//textbox1.Text = “A”
//MessageBox.Show(wParam.ToString(),"dd");
return 1;
}
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}
// 安装钩子
public void HookStart()
{
if(hKeyboardHook == 0)
{
// 创建HookProc实例
KeyboardHookProcedure = new HookProc(KeyboardHookProc);
// 设置线程钩子
//hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD, KeyboardHookProcedure, IntPtr.Zero,
// GetCurrentThreadId());
hKeyboardHook = SetWindowsHookEx( WH_KEYBOARD,KeyboardHookProcedure,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),0);
// 如果设置钩子失败
if(hKeyboardHook == 0 )
{
HookStop();
throw new Exception("SetWindowsHookEx failedeeeeeeee.");
}
}
}
// 卸载钩子
public void HookStop()
{
bool retKeyboard = true;
if(hKeyboardHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
hKeyboardHook = 0;
}
if (!(retKeyboard))
{
throw new Exception("UnhookWindowsHookEx failedsssss.");
}
}
public struct KeyMSG
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
}
}
hKeyboardHook = SetWindowsHookEx( WH_KEYBOARD,KeyboardHookProcedure,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),0); hKeyboardHook得不到钩子句柄,而是得到0,怎么回事呢?