如何检测鼠标点击？

Question

如何在Windows上检测鼠标点击？(XP/Vista/7的).例如,当我的应用程序运行时,它将检测用户是否点击某些内容(不在该应用程序UI上,而是在Windows UI上).如果是,则执行另一个进程.

我不知道这是否可能,我希望有人可以给我一些指导.

谢谢!

Answer 1

如果要拦截任何鼠标点击,移动,鼠标滚轮点击等,您需要编写鼠标挂钩.

如果您想在自己的应用程序之外跟踪鼠标活动,这是AFAIK的唯一方法.如果要安装挂钩,则需要从User32.dll文件导入SetWindowsHookEx(...)函数.它涉及互操作(PInvoke),你必须导入(DllImport)一些函数.

以下是Microsoft关于如何在C#中实现此目的的官方文档:

如何在Visual C#.NET中设置Windows挂钩

我将在这里总结一下,如果链接有一天会死,那么答案就完整了.

从SetWindowsHookEx函数开始:

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

现在你可以设置你的钩子了.例如:

public class Form1
{
    static int hHook = 0;
    public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);
    HookProc MouseHookProcedure;

    private void ActivateMouseHook_Click(object sender, System.EventArgs e)
    {
        if(hHook == 0)
        {
            MouseHookProcedure = new HookProc(Form1.MouseHookProc);
            hHook = SetWindowsHookEx(WH_MOUSE, 
                             MouseHookProcedure,
                             (IntPtr) 0,
                             AppDomain.GetCurrentThreadId());
        }
    }
}

不要忘记事后取消它.你需要另一个DllImport:

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

private void DeactivateMouseHook_Click(object sender, System.EventArgs e)
{
    bool ret = UnhookWindowsHookEx(hHook);
}    

您可以使用HookProc委托(MouseHookProcedure)捕获鼠标活动.这涉及一些编组以捕获数据.

[StructLayout(LayoutKind.Sequential)]
public class POINT 
{
    public int x;
    public int y;
}

[StructLayout(LayoutKind.Sequential)]
public class MouseHookStruct 
{
    public POINT pt;
    public int hwnd;
    public int wHitTestCode;
    public int dwExtraInfo;
}

public static int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{          
    MouseHookStruct MyMouseHookStruct = (MouseHookStruct)
        Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));

    // You can get the coördinates using the MyMouseHookStruct.
    // ...       
    return CallNextHookEx(hHook, nCode, wParam, lParam); 
}

不要忘记之后调用钩子链中的下一个项目(CallNextHookEx)!

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

PS:你可以为键盘做同样的事情.

Answer 2

Windows挂钩机制是您需要使用的.看一下这篇文章:用C#处理全局鼠标和键盘钩子

Answer 3

虽然Christophe Geers解决方案可帮助您捕获鼠标事件,但它无法提供完整的问题解决方案.爱德华想知道如何获得点击事件.

要获得点击事件,请使用Christophe Geers提供的解决方案.并添加/编辑以下内容:

enum MouseMessages
{
    WM_LBUTTONDOWN = 0x0201,
    WM_LBUTTONUP = 0x0202,
    WM_MOUSEMOVE = 0x0200,
    WM_MOUSEWHEEL = 0x020A,
    WM_RBUTTONDOWN = 0x0204,
    WM_RBUTTONUP = 0x0205
}

public static int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
    //Marshall the data from the callback.
    MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));

    if (nCode >= 0 &&
        MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam)
    {
        // Do something here
    }
    return CallNextHookEx(hookHandle, nCode, wParam, lParam);
}