试图读取活动窗口标题时,它在控制台应用程序中更改
本文关键字:控制台 应用程序 读取 活动 窗口标题 | 更新日期: 2023-09-27 18:09:17
我正试图编写一个程序,写入活动窗口标题,每当它改变到控制台窗口。
这是我的代码,它可以在winform应用程序中工作,但不能在控制台应用程序中工作,我不知道哪里出错了。
如有任何帮助,不胜感激。
class Program
{
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)
{
Console.WriteLine(GetActiveWindowTitle() + "'r'n");
}
static void Main(string[] args)
{
WinEventDelegate dele = null;
Program a = new Program();
dele = new WinEventDelegate(a.WinEventProc);
IntPtr m_hhook = SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, dele, 0, 0, WINEVENT_OUTOFCONTEXT);
Console.ReadKey();
}
}
"调用SetWinEventHook
的客户端线程必须有一个消息循环才能接收事件。"控制台应用程序中的线程没有消息循环。除非你自己建一个:
using System.ComponentModel;
using System.Windows.Forms;
...
[DllImport("user32.dll", SetLastError = true)]
static extern int GetMessage(out Message lpMsg, IntPtr hwnd, int wMsgFilterMin, int wMsgFilterMax);
[DllImport("user32.dll")]
static extern int TranslateMessage(Message lpMsg);
[DllImport("user32.dll")]
static extern int DispatchMessage(Message lpMsg);
将Console.ReadKey()
替换为
Message msg;
while (true) {
int result = GetMessage(out msg, IntPtr.Zero, 0, 0);
if (result == 0) break;
if (result == -1) throw new Win32Exception();
TranslateMessage(msg);
DispatchMessage(msg);
}
我很懒,从System.Windows.Forms
取Message
结构。如果你不想接受依赖关系,你可以单独添加它的定义。
由于该线程现在被处理消息所占用,如果您想要进行其他处理,您可能希望在单独的专用线程上执行此操作。