C++ 串口线程钩子demo

以下是一个简单的C++串口线程钩子demo：

#include <windows.h>
#include <iostream>
using namespace std;

// 定义串口号，可以根据实际情况修改
#define PORT "COM1"

// 线程钩子函数
DWORD WINAPI ThreadProc(LPVOID lpParam)
{
    HANDLE hCom = (HANDLE) lpParam;
    char buffer[256];
    DWORD dwBytesRead;

    while (true)
    {
        // 读取串口数据
        if (ReadFile(hCom, buffer, sizeof(buffer), &dwBytesRead, NULL))
        {
            // 输出读取到的数据
            for (DWORD i = 0; i < dwBytesRead; i++)
            {
                cout << buffer[i];
            }
        }
        else
        {
            cerr << "ReadFile failed!" << endl;
            break;
        }
    }

    return 0;
}

int main()
{
    // 打开串口
    HANDLE hCom = CreateFileA(PORT, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (hCom == INVALID_HANDLE_VALUE)
    {
        cerr << "CreateFileA failed!" << endl;
        return -1;
    }

    // 配置串口参数
    DCB dcb;
    ZeroMemory(&dcb, sizeof(dcb));
    dcb.DCBlength = sizeof(dcb);
    if (!GetCommState(hCom, &dcb))
    {
        cerr << "GetCommState failed!" << endl;
        CloseHandle(hCom);
        return -1;
    }
    dcb.BaudRate = CBR_9600;
    dcb.ByteSize = 8;
    dcb.StopBits = ONESTOPBIT;
    dcb.Parity = NOPARITY;
    if (!SetCommState(hCom, &dcb))
    {
        cerr << "SetCommState failed!" << endl;
        CloseHandle(hCom);
        return -1;
    }

    // 启动线程钩子
    DWORD dwThreadId;
    HANDLE hThread = CreateThread(NULL, 0, ThreadProc, hCom, 0, &dwThreadId);
    if (hThread == NULL)
    {
        cerr << "CreateThread failed!" << endl;
        CloseHandle(hCom);
        return -1;
    }

    // 等待线程钩子结束
    WaitForSingleObject(hThread, INFINITE);

    // 关闭线程钩子和串口
    CloseHandle(hThread);
    CloseHandle(hCom);

    return 0;
}

该demo中通过CreateFileA函数打开串口，使用ReadFile函数读取串口数据，并通过线程钩子函数ThreadProc在单独的线程中不断读取串口数据并输出。在主函数中，首先配置串口参数，然后创建线程钩子，最后等待线程钩子结束并关闭线程钩子和串口。