C# 获取指定进程的主窗口句柄

静态方法，直接上代码吧：

using System;
using System.Runtime.InteropServices;

namespace Macroresolute
{
    public static class ProcessEx
    {
        private static class NativeMethods
        {
            internal const uint GW_OWNER = 4;

            internal delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern int GetWindowThreadProcessId(IntPtr hWnd, out IntPtr lpdwProcessId);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);

            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            internal static extern bool IsWindowVisible(IntPtr hWnd);
        }

        public static IntPtr GetMainWindowHandle(int processId)
        {
            IntPtr MainWindowHandle = IntPtr.Zero;

            NativeMethods.EnumWindows(new NativeMethods.EnumWindowsProc((hWnd, lParam) =>
            {
                IntPtr PID;
                NativeMethods.GetWindowThreadProcessId(hWnd, out PID);

                if (PID == lParam &&
                    NativeMethods.IsWindowVisible(hWnd) &&
                    NativeMethods.GetWindow(hWnd, NativeMethods.GW_OWNER) == IntPtr.Zero)
                {
                    MainWindowHandle = hWnd;
                    return false;
                }

                return true;

            }), new IntPtr(processId));

            return MainWindowHandle;
        }
    }
}