c# - Windows 回调，当事件窗口改变时

Question

public class ActiveWindow
{
public delegate void ActiveWindowChangedHandler(object sender, String windowHeader,IntPtr hwnd);
public event ActiveWindowChangedHandler ActiveWindowChanged;

[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll")]
static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);

delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType,
    IntPtr hwnd, int idObject, int idChild, uint dwEventThread,
    uint dwmsEventTime);

const uint WINEVENT_OUTOFCONTEXT = 0;
const uint EVENT_SYSTEM_FOREGROUND = 3;

[DllImport("user32.dll")]
static extern bool UnhookWinEvent(IntPtr hWinEventHook);

[DllImport("user32.dll")]
static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax,
    IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc,
    uint idProcess, uint idThread, uint dwFlags);

IntPtr m_hhook;
private WinEventDelegate _winEventProc;

public ActiveWindow()
{
    _winEventProc = new WinEventDelegate(WinEventProc);
    m_hhook = SetWinEventHook(EVENT_SYSTEM_FOREGROUND,
        EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, _winEventProc,
        0, 0, WINEVENT_OUTOFCONTEXT);
}

void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd,
    int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
    if (eventType == EVENT_SYSTEM_FOREGROUND)
    {
        if (ActiveWindowChanged != null)
            ActiveWindowChanged(this,GetActiveWindowTitle(hwnd),hwnd);
    }
}

private string GetActiveWindowTitle(IntPtr hwnd)
{
    StringBuilder Buff = new StringBuilder(500);
    GetWindowText(hwnd, Buff, Buff.Capacity);
    return Buff.ToString();
}

~ActiveWindow()
{
    UnhookWinEvent(m_hhook);
}
}

当我在事件窗口之间切换时，我得到回调但是当我最大化最小化的窗口时，我没有收到回电，

我找到了解决这个问题的方法，但我正在寻求更好的解决方案

我们将不胜感激。

Answer 1

when i switch between the active windows i get the callback but when i maximize a minimized window i don't get a call back

是的，您需要使用 EVENT_SYSTEM_MINIMIZESTART 或 EVENT_SYSTEM_MINIMIZEEND event constant接收窗口对象被最小化的通知。

使用 SetWinEventHook function 的 eventMin 和 eventMax 参数表示您有兴趣接收这些事件之一的通知和EVENT_SYSTEM_FOREGROUND。