如何检查哪个程序处于焦点状态？

Question

我正在尝试让计时器每 250 毫秒检查一次特定程序是否处于焦点状态，但我就是不知道如何...

当前代码：

using System.Diagnostics;
using System.Runtime.InteropServices;

namespace Hearthstone_Test
{
  public partial class Main : Form
  {
    private void timer1_Tick(object sender, EventArgs e)
    {
        var activatedHandle = GetForegroundWindow();
        if (GetForegroundWindow() == Process.GetProcessesByName("Hearthstone"));
        {
            Console.WriteLine("Not Focused");       // No window is currently activated
        }
        else 
        { 
            Console.WriteLine("Focused");
        }

        var procId = Process.GetCurrentProcess().Id;
        int activeProcId;
        GetWindowThreadProcessId(activatedHandle, out activeProcId);
    }
    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
    private static extern IntPtr GetForegroundWindow();
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern int GetWindowThreadProcessId(IntPtr handle, out int processId);
  }
}

错误在第 11 行：

Operator '==' cannot be applied to operands of type 'Process[]' and 'IntPtr'

我做错了什么？

Answer 1

您正在比较由 GetForegroundWindow() 编辑的 IntPtr return 与 Process[]。顾名思义，Process.GetProcessesByName 可以 return 多个进程，因此您需要将其视为一个数组。

将 Process.GetProcessesByName("Hearthstone") 保存到一个变量中，并遍历每个条目以查看它是否是焦点所在的条目。此外，您假设句柄是进程 ID；事实并非如此。以下代码未经测试。

...
var processes = Process.GetProcessesByName("Hearthstone");
foreach(Process p in processes) {
    if(activedHandle == p.Handle) {
        //A instance of the process Hearthstone is currently focused.
        ...
    } else {
        ...
    }
}

Answer 2

这对我有用，因为它 returns 活跃的 window 名称略有不同：

public string getActiveWindowName()
{
    try
    {
        var activatedHandle = GetForegroundWindow();

        Process[] processes = Process.GetProcesses();
        foreach (Process clsProcess in processes)
        {

            if(activatedHandle == clsProcess.MainWindowHandle)
            {
                string processName = clsProcess.ProcessName;

                return processName;
            }
        }
    }
    catch { }
    return null;
}

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
private static extern IntPtr GetForegroundWindow();

以下将为您提供实际的 window header 文本：

string processName = clsProcess.MainWindowTitle;

如何检查哪个程序处于焦点状态？

How can I check which program is in focus?

c#

focus

window