获取另一个进程的窗口状态

Question

如何获取正在运行的另一个进程的窗口状态(maximized,minimized)？

我试过用这个:

Process[] procs = Process.GetProcesses();

        foreach (Process proc in procs)
        {

            if (proc.ProcessName == "notepad")
            {
                MessageBox.Show(proc.StartInfo.WindowStyle.ToString());

            }
        }

但如果过程是Maximized或者Minimized,它就会回归Normal.

如何解决这个问题？

Answer 1

您需要通过P/Invoke使用Win32来检查另一个窗口的状态.以下是一些示例代码:

static void Main(string[] args)
{
    Process[] procs = Process.GetProcesses();

    foreach (Process proc in procs)
    {
        if (proc.ProcessName == "notepad")
        {
            var placement = GetPlacement(proc.MainWindowHandle);
            MessageBox.Show(placement.showCmd.ToString());
        }
    }
}

private static WINDOWPLACEMENT GetPlacement(IntPtr hwnd)
{
    WINDOWPLACEMENT placement = new WINDOWPLACEMENT();
    placement.length = Marshal.SizeOf(placement);
    GetWindowPlacement(hwnd, ref placement);
    return placement;
}

[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool GetWindowPlacement(
    IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);

[Serializable]
[StructLayout(LayoutKind.Sequential)]
internal struct WINDOWPLACEMENT
{
    public int length;
    public int flags;
    public ShowWindowCommands showCmd;
    public System.Drawing.Point ptMinPosition;
    public System.Drawing.Point ptMaxPosition;
    public System.Drawing.Rectangle rcNormalPosition;
}

internal enum ShowWindowCommands : int
{
    Hide = 0,
    Normal = 1,
    Minimized = 2,
    Maximized = 3,
}

定义由pinvoke.net提供.

Answer 2

你正在使用proc.StartInfo,这是不正确的.它不反映目标进程的运行时窗口样式.它只是您可以设置的启动信息,然后可以在启动时传递给进程.

C#签名是:

[DllImport("user32.dll", SetLastError=true)]
static extern int GetWindowLong(IntPtr hWnd, int nIndex);

您需要使用p/invoke并调用GetWindowLong(hWnd,GWL_STYLE),并将proc.MainWindowHandle作为hWnd参数传递.

您可以通过执行以下操作来检查窗口是否最小化/最大化:

int style = GetWindowLong(proc.MainWindowHandle,  GWL_STYLE);
if((style & WS_MAXIMIZE) == WS_MAXIMIZE) 
{
   //It's maximized
} 
else if((style & WS_MINIMIZE) == WS_MINIMIZE) 
{
  //It's minimized
}

注意:标志的值(WS_MINIMIZE等)可以在此页面中找到:http://www.pinvoke.net/default.aspx/user32.getwindowlong

感谢Kakashi指出我们在测试结果时的错误.

Answer 3

在 Windows PowerShell 中，您可以通过以下代码来执行此操作：

Add-Type -AssemblyName UIAutomationClient
$prList = Get-Process -Name "<ProcessNamesWhichHaveWindow>"
$prList | % {
    try {
        $ae = [System.Windows.Automation.AutomationElement]::FromHandle($_.MainWindowHandle)
        $wp = $ae.GetCurrentPattern([System.Windows.Automation.WindowPatternIdentifiers]::Pattern)
        echo "Window title: $($_.MainWindowTitle)"
        echo "Window visual state: $($wp.Current.WindowVisualState)"
    }
    catch { }
}