C++ 读取并修改指定串口的钩子代码

以下是一个简单的 C++ 代码示例，可以用于读取和修改指定串口的钩子：

#include <windows.h>
#include <iostream>

using namespace std;

// 定义串口句柄
HANDLE hSerial;

// 定义缓冲区大小
const int bufferSize = 100;

// 定义缓冲区
char buffer[bufferSize];

// 串口读取函数
void readFromSerial() {
    DWORD bytesRead;
    if (ReadFile(hSerial, buffer, bufferSize, &bytesRead, NULL)) {
        // 读取成功
        buffer[bytesRead] = '\0';
        cout << "Received: " << buffer << endl;
    } else {
        // 读取失败
        cout << "Failed to read from serial port." << endl;
    }
}

// 串口写入函数
void writeToSerial(char* data) {
    DWORD bytesWritten;
    if (WriteFile(hSerial, data, strlen(data), &bytesWritten, NULL)) {
        // 写入成功
        cout << "Sent: " << data << endl;
    } else {
        // 写入失败
        cout << "Failed to write to serial port." << endl;
    }
}

// 串口钩子函数
LRESULT CALLBACK serialHook(int nCode, WPARAM wParam, LPARAM lParam) {
    if (nCode < 0) {
        // 钩子无效
        return CallNextHookEx(NULL, nCode, wParam, lParam);
    }
    
    // 读取串口数据
    readFromSerial();
    
    // 修改数据并写回串口
    char newData[] = "New data to send.";
    writeToSerial(newData);
    
    // 返回下一个钩子的结果
    return CallNextHookEx(NULL, nCode, wParam, lParam);
}

int main() {
    // 打开串口
    hSerial = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    
    // 设置串口参数
    DCB dcbSerialParams = { 0 };
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        cout << "Failed to get serial port parameters." << endl;
        return 1;
    }
    dcbSerialParams.BaudRate = CBR_9600;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;
    if (!SetCommState(hSerial, &dcbSerialParams)) {
        cout << "Failed to set serial port parameters." << endl;
        return 1;
    }
    
    // 创建串口钩子
    HHOOK hook = SetWindowsHookEx(WH_GETMESSAGE, serialHook, NULL, GetCurrentThreadId());
    if (hook == NULL) {
        cout << "Failed to set serial port hook." << endl;
        return 1;
    }
    
    // 循环等待消息
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    
    // 关闭串口
    CloseHandle(hSerial);
    
    return 0;
}

请注意，这只是一个简单的示例代码，用于演示如何使用钩子读取和修改指定串口的数据。实际应用中，您需要根据您的具体需求进行修改和优化。同时，请务必遵守相关法律法规，确保您的应用程序符合法律要求。