c# - 如何将焦点设置到另一个窗口？

Question

我遇到了一个失去焦点的程序的问题。这不是我的程序。如何编写第二个程序以每 1-2 秒将焦点设置到该窗口？有可能这样做吗？

Answer 1

如果您想关注其他程序/进程，可以使用以下 Win32 API 调用。

[DllImport("user32.dll")]
static extern bool SetForegroundWindow (IntPtr hWnd);

private void BringToFront(Process pTemp)
{
    SetForegroundWindow(pTemp.MainWindowHandle);
}

Answer 2

使用 spy++ 或其他 ui 工具查找您要聚焦的窗口的类名，例如：focusWindowClassName。然后添加以下函数：

[DllImport("USER32.DLL")]
public static extern bool SetForegroundWindow(IntPtr hWnd);

[System.Runtime.InteropServices.DllImport("User32.dll")]
 public static extern bool ShowWindow(IntPtr handle, int nCmdShow);

[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

//Then:
// [Edit] Changed IntPrt to IntPtr
IntPtr hWnd = FindWindow("focusWindowClassName", null); // this gives you the handle of the window you need.

// then use this handle to bring the window to focus or forground(I guessed you wanted this).

// sometimes the window may be minimized and the setforground function cannot bring it to focus so:

/*use this ShowWindow(IntPtr handle, int nCmdShow);
*there are various values of nCmdShow 3, 5 ,9. What 9 does is: 
*Activates and displays the window. If the window is minimized or maximized, *the system restores it to its original size and position. An application *should specify this flag when restoring a minimized window */

ShowWindow(hWnd, 9); 
//The bring the application to focus
SetForegroundWindow(hWnd);

// you wanted to bring the application to focus every 2 or few second
// call other window as done above and recall this window again.