记录一次线程间通信PostThreadMessage（张三不是張三，张三是张三）

事情是这样的，想使用线程间通信ChatGPT走一波

using System;
using System.Runtime.InteropServices;
using System.Threading;
public class Program
{
    // 定义常量，表示自定义消息
    private const int WM_CUSTOM_MESSAGE = 0x0400;
    // 定义用于接收消息的消息循环
    private static void MessageLoop()
    {
        while (true)
        {
            // 接收消息并处理
            if (NativeMethods.PeekMessage(out NativeMethods.MSG msg, IntPtr.Zero, 0, 0, 1))
            {
                // 处理消息
                if (msg.message == WM_CUSTOM_MESSAGE)
                {
                    Console.WriteLine("Received custom message!");
                }
                else if (msg.message == NativeMethods.WM_QUIT)
                {
                    break;
                }
                NativeMethods.TranslateMessage(ref msg);
                NativeMethods.DispatchMessage(ref msg);
            }
            Thread.Sleep(100); // 等待一段时间，防止CPU占用过高
        }
    }
    public static void Main()
    {
        // 创建一个新线程，并执行消息循环
        Thread thread = new Thread(MessageLoop);
        thread.Start();
        // 在主线程中发送消息
        int threadId = thread.ManagedThreadId;
        NativeMethods.PostThreadMessage(threadId, WM_CUSTOM_MESSAGE, IntPtr.Zero, IntPtr.Zero);
        // 等待一段时间，以便接收消息
        Thread.Sleep(1000);
        // 退出消息循环
        NativeMethods.PostThreadMessage(threadId, NativeMethods.WM_QUIT, IntPtr.Zero, IntPtr.Zero);
        // 等待线程结束
        thread.Join();
    }
}
public static class NativeMethods
{
    // 定义Windows常量
    public const int WM_QUIT = 0x0012;
    // 定义Windows消息结构
    [StructLayout(LayoutKind.Sequential)]
    public struct MSG
    {
        public IntPtr hwnd;
        public uint message;
        public IntPtr wParam;
        public IntPtr lParam;
        public uint time;
        public POINT pt;
    }
    [StructLayout(LayoutKind.Sequential)]
    public struct POINT
    {
        public int x;
        public int y;
    }
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern bool PostThreadMessage(int threadId, uint msg, IntPtr wParam, IntPtr lParam);
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern bool PeekMessage(out MSG msg, IntPtr hwnd, uint filterMin, uint filterMax, uint remove);
    
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern bool TranslateMessage(ref MSG msg);
    
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr DispatchMessage(ref MSG msg);
}

代码看上去非常棒。。。偶而。。。。运行结果不是想的那样。

细查PostThreadMessage 总是返回false.为啥？（ChatGPT一直各种PeekMessage,GetMessage顾左右而言它）

查了很多，突然有看别人使用window API

[DllImport("kernel32"), SuppressUnmanagedCodeSecurity]
static extern int GetCurrentThreadId();

为什么需要WindowsApi呢，想想这是通过window的。。。使用它的id合理。不对呀？

thread.ManagedThreadId; 

我给的是.net托管里的ID。

如此使用在  MessageLoop 线程中GetCurrentThreadId();再传给PoseThreadMessage... 结果差不多了。

讲白 就是张三不是張三，张三是张三。