通过COM端口进行C++通信

Question

如何通过带有C++的COM端口与设备通信？是否有一个处理此问题的Windows库？

提前致谢.

编辑:我正在使用Windows.

Answer 1

您可以使用常规文件I/O API调用,例如CreateFile()和ReadFile()来完成此操作.如其他调用GetCommState(),并SetCommState()可以使用一次它一直开到改变串口的各种设置.

HANDLE hSerial;
hSerial = CreateFile(
    "COM1",
    GENERIC_READ | GENERIC_WRITE,
    0,
    0,
    OPEN_EXISTING,
    FILE_ATTRIBUTE_NORMAL,
    0);
if(hSerial==INVALID_HANDLE_VALUE)
{
    if(GetLastError()==ERROR_FILE_NOT_FOUND)
    {
        //serial port does not exist. Inform user.
    }
    //some other error occurred. Inform user.
}


DCB dcbSerialParams = {0};
dcbSerial.DCBlength=sizeof(dcbSerialParams);
if (!GetCommState(hSerial, &dcbSerialParams))
{
    //error getting state
}
dcbSerialParams.BaudRate=CBR_19200;
dcbSerialParams.ByteSize=8;
dcbSerialParams.StopBits=ONESTOPBIT;
dcbSerialParams.Parity=NOPARITY;
if(!SetCommState(hSerial, &dcbSerialParams))
{
    //error setting serial port state
}