论坛里看到有讨论全局钩子的,代码大概一致,不过我遇到一个问题:虽然全局钩子能挂上,但是不管我按哪个键返回的值都一样,ncode返回的是0,wparam返回256,lparam返回一串不变的数字,不知道是为啥,麻烦帮我瞅瞅。不胜感激!
代码如下:
public delegate int HOOKPROC(int nCode, int wParam, int lParam);
public enum HookType
{
WH_KEYBOARD = 2,//私有钩子
WH_KEYBOARD_LL = 13//全局钩子
}
public abstract class hook
{
//设置钩子
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(HookType idHook, HOOKPROC lpfn, IntPtr hInstance, int threadId);
//抽调钩子
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook); [DllImport("kernel32")]
public static extern int GetCurrentThreadId(); [DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name); /// <summary>
/// 钩子处理委托
/// </summary>
public HOOKPROC proc;
/// <summary>
/// 钩子类型
/// </summary>
public HookType type;
/// <summary>
/// 钩子的句柄
/// </summary>
public int hHook = 0; public hook(HOOKPROC proc, HookType type)
{
this.proc = proc;
this.type = type;
} public abstract int SetWindowsHookEx();
public virtual void UnhookWindowsHookEx()
{
bool retKeyboard = true;
if (hHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = 0;
}
if (!retKeyboard)
{
throw new Exception("UnhookWindowsHookEx failed.");
}
}
}
public class PublicHook : hook
{
public PublicHook(HOOKPROC proc)
: base(proc, HookType.WH_KEYBOARD_LL)
{ } public override int SetWindowsHookEx()
{
if (hHook == 0)
//hHook = SetWindowsHookEx(this.type, this.proc, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
hHook = SetWindowsHookEx(this.type, this.proc, GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
return hHook;
}
} public class PrivateHook : hook
{
public PrivateHook(HOOKPROC proc)
: base(proc, HookType.WH_KEYBOARD)
{ } public override int SetWindowsHookEx()
{
if (hHook == 0)
hHook = SetWindowsHookEx(this.type, this.proc, IntPtr.Zero, GetCurrentThreadId());
return hHook;
}
}
代码如下:
public delegate int HOOKPROC(int nCode, int wParam, int lParam);
public enum HookType
{
WH_KEYBOARD = 2,//私有钩子
WH_KEYBOARD_LL = 13//全局钩子
}
public abstract class hook
{
//设置钩子
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(HookType idHook, HOOKPROC lpfn, IntPtr hInstance, int threadId);
//抽调钩子
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook); [DllImport("kernel32")]
public static extern int GetCurrentThreadId(); [DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name); /// <summary>
/// 钩子处理委托
/// </summary>
public HOOKPROC proc;
/// <summary>
/// 钩子类型
/// </summary>
public HookType type;
/// <summary>
/// 钩子的句柄
/// </summary>
public int hHook = 0; public hook(HOOKPROC proc, HookType type)
{
this.proc = proc;
this.type = type;
} public abstract int SetWindowsHookEx();
public virtual void UnhookWindowsHookEx()
{
bool retKeyboard = true;
if (hHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = 0;
}
if (!retKeyboard)
{
throw new Exception("UnhookWindowsHookEx failed.");
}
}
}
public class PublicHook : hook
{
public PublicHook(HOOKPROC proc)
: base(proc, HookType.WH_KEYBOARD_LL)
{ } public override int SetWindowsHookEx()
{
if (hHook == 0)
//hHook = SetWindowsHookEx(this.type, this.proc, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
hHook = SetWindowsHookEx(this.type, this.proc, GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
return hHook;
}
} public class PrivateHook : hook
{
public PrivateHook(HOOKPROC proc)
: base(proc, HookType.WH_KEYBOARD)
{ } public override int SetWindowsHookEx()
{
if (hHook == 0)
hHook = SetWindowsHookEx(this.type, this.proc, IntPtr.Zero, GetCurrentThreadId());
return hHook;
}
}
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soso发现一个和我问题一样的,但是回答的人说qq联系
第二个参数在托管代码里应该是委托
既然是全局钩子,第三个应该是动态链接库
我是菜鸟。。nCode返回 上(还是下 忘了)一个钩子的句柄,如果只有你1个钩子 当然只返回0
nCode 键盘消息的处理方式
wParam 按键的虚拟码
lParam 按键的重复次数、扫描码和标志等数据应该是这样的吧?我现在的问题是无论我按什么键,返回的都是 同一组代码
//Hook结构
[StructLayout(LayoutKind.Sequential)]
public class HookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
int GetHookCode(int nCode, int wParam, int lParam)
{ //转换结构
HookStruct hookStruct = (HookStruct)Marshal.PtrToStructure((IntPtr)lParam, typeof(HookStruct));
MessageBox.Show("您按下了" + (Keys)hookStruct.vkCode);
return nCode;
} HOOKPROC h = new HOOKPROC(GetHookCode);
PublicHook hook = new PublicHook(h);
hook.SetWindowsHookEx();