Windows平台下C语言串口RI引脚的获取

#include <windows.h>
#include <stdio.h>

int main() {
    HANDLE hSerial;
    COMMTIMEOUTS timeouts;
    DWORD bytesTransferred;
    DWORD errors;
    DWORD eventMask;

    // 打开串口
    hSerial = CreateFile(
        "\\\\.\\COM1",  // 串口名称
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL,
        OPEN_EXISTING,
        0,
        NULL
    );

    if (hSerial == INVALID_HANDLE_VALUE) {
        if (GetLastError() == ERROR_FILE_NOT_FOUND) {
            printf("Serial port does not exist.\n");
        } else {
            printf("Error opening serial port.\n");
        }
        return 1;
    }

    // 配置串口
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;

    if (!SetCommState(hSerial, &timeouts)) {
        printf("Error setting serial port state.\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 设置事件掩码
    if (!SetCommMask(hSerial, EV_RXCHAR | EV_ERR)) {
        printf("Error setting event mask.\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 等待事件
    if (!WaitCommEvent(hSerial, &eventMask, NULL)) {
        printf("Error waiting for serial port event.\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 检查RI事件
    if (eventMask & EV_RXCHAR) {
        char buffer[256];
        if (ReadFile(hSerial, buffer, sizeof(buffer), &bytesTransferred, NULL)) {
            printf("Received data: %.*s\n", bytesTransferred, buffer);
        } else {
            printf("Error reading from serial port.\n");
        }
    }

    // 关闭串口
    CloseHandle(hSerial);

    return 0;
}