CBR_10400未声明的错误？ [英] CBR_10400 undeclared error?

问题描述

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

int main()
{
    // Defining hexadecimal bytes
    int bytes_to_send[5];
    bytes_to_send[0] = 0x81;
    bytes_to_send[1] = 0x11;
    bytes_to_send[2] = 0xF1;
    bytes_to_send[3] = 0x11;
    bytes_to_send[4] = 0x04;

    // Declare variables and structures
    HANDLE hSerial;
    DCB dcbSerialParams = {0};
    COMMTIMEOUTS timeouts = {0};

    // Open the highest available serial port number
    fprintf(stderr, "Opening serial port...");
    hSerial = CreateFile(
                "\\\\.\\COM4", GENERIC_READ|GENERIC_WRITE, 0, NULL,
                OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );
    if (hSerial == INVALID_HANDLE_VALUE)
    {
            fprintf(stderr, "Error\n");
            return 1;
    }
    else fprintf(stderr, "OK\n");

    // Set device parameters (10400 baud, 1 start bit,
    // 1 stop bit, no parity)
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (GetCommState(hSerial, &dcbSerialParams) == 0)
    {
        fprintf(stderr, "Error getting device state\n");
        CloseHandle(hSerial);
        return 1;
    }

    dcbSerialParams.BaudRate = CBR_10400;   // CBR_10400 undeclared error//
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;
    if(SetCommState(hSerial, &dcbSerialParams) == 0)
    {
        fprintf(stderr, "Error setting device parameters\n");
        CloseHandle(hSerial);
        return 1;
    }

    // Set COM port timeout settings
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;
    if(SetCommTimeouts(hSerial, &timeouts) == 0)
    {
        fprintf(stderr, "Error setting timeouts\n");
        CloseHandle(hSerial);
        return 1;
    }

    // Send specified text (remaining command line arguments)
    DWORD bytes_written, total_bytes_written = 0;
    fprintf(stderr, "Sending bytes...");
    if(!WriteFile(hSerial, bytes_to_send, 5, &bytes_written, NULL))
    {
        fprintf(stderr, "Error\n");
        CloseHandle(hSerial);
        return 1;
    }
    fprintf(stderr, "%d bytes written\n", bytes_written);

    // Close serial port
    fprintf(stderr, "Closing serial port...");
    if (CloseHandle(hSerial) == 0)
    {
        fprintf(stderr, "Error\n");
        return 1;
    }
    fprintf(stderr, "OK\n");

    // exit normally
    return 0;
}

推荐答案

CBR_10400 没有定义（参见 winbase.h 中的 CBR _ * 定义。



您的意思是 CBR_14400 ？



如果您想使用非标准波特率，只需传递数值：

There is no definition for CBR_10400 (see the CBR_* definitions in winbase.h).

Did you mean CBR_14400?

If you want to use a non-standard baud rate, just pass the numeric value:

dcbSerialParams.BaudRate = 10400;

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