通过单击C#获取进程窗口句柄

using System.Diagnostics;

Process process = Process.GetCurrentProcess();
IntPtr processHandle = process.Handle;

IntPtr foregroundWindowHandle = GetForegroundWindow();

if (processHandle == foregroundWindowHandle)
{
    // 当前窗口是所要获取的进程窗口
    // 可以在这里进行你想要进行的操作
}

// 获取窗口标题
string windowTitle = GetWindowTitle(processHandle);

// 获取窗口是否激活
bool isWindowActive = IsWindowActive(processHandle);

// 获取窗口大小
RECT windowRect = new RECT();
GetWindowRect(processHandle, ref windowRect);