一段能够读取USB串口信息并打印的C++代码

Sure, I can help you with that! Here is a sample C code snippet that reads USB serial port information and prints it:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>

int main(int argc, char* argv[])
{
    int fd;
    struct termios options;
    char buf[256];

    if ((fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY)) == -1) {
        perror("open_port: Unable to open /dev/ttyUSB0 - ");
        return 1;
    }

    tcgetattr(fd, &options);
    cfsetispeed(&options, B115200);
    cfsetospeed(&options, B115200);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    tcsetattr(fd, TCSANOW, &options);

    while (1) {
        memset(buf, 0, sizeof(buf));
        if (read(fd, buf, sizeof(buf)) > 0) {
            printf("%s", buf);
        }
    }

    close(fd);
    return 0;
}

Note that this code assumes that the USB serial port you want to read from is located at "/dev/ttyUSB0". You may need to modify this depending on your system configuration. Also, make sure to include the necessary headers and libraries.