当前活动窗口更改时,如何调用回调。我已经看到了如何使用CBTProc完成它。但是,全局事件不容易与托管代码挂钩。我有兴趣寻找一种不需要轮询的方法。我更喜欢事件驱动的方法。
问候
创建一个新的Windows窗体项目,添加一个文本框,使其多行,并将文本框的Dock属性设置为fill,将其命名为Log并粘贴以下代码(您需要将System.Runtime.InteropServices添加到您的用法中)。 ..
WinEventDelegate dele = null; public Form1() { InitializeComponent(); dele = new WinEventDelegate(WinEventProc); IntPtr m_hhook = SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, dele, 0, 0, WINEVENT_OUTOFCONTEXT); } delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime); [DllImport("user32.dll")] static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags); private const uint WINEVENT_OUTOFCONTEXT = 0; private const uint EVENT_SYSTEM_FOREGROUND = 3; [DllImport("user32.dll")] static extern IntPtr GetForegroundWindow(); [DllImport("user32.dll")] static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count); private string GetActiveWindowTitle() { const int nChars = 256; IntPtr handle = IntPtr.Zero; StringBuilder Buff = new StringBuilder(nChars); handle = GetForegroundWindow(); if (GetWindowText(handle, Buff, nChars) > 0) { return Buff.ToString(); } return null; } public void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime) { Log.Text += GetActiveWindowTitle() + "\r\n"; }