c# – 如何检测鼠标点击？

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.它涉及到interop(PInvoke),你必须导入(DllImport)一些功能.

这是Microsoft的官方文档,关于如何在C#中实现这一点：

How to set a Windows hook in Visual C# .NET

我会在这里总结一下,只是为了完成一个连接死亡的答案.

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());
        }
    }
}

不要忘了解开它.您将需要另一个DllImport：

[DllImport("user32.dll",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代理(MouseHookProcedure)捕获鼠标活动.这涉及到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 lParam)
{          
    MouseHookStruct MyMouseHookStruct = (MouseHookStruct)
        Marshal.PtrToStructure(lParam,typeof(MouseHookStruct));

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

别忘了调用钩链中的下一个项目(CallNextHookEx)！

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

PS：你可以对键盘做同样的事情.