通过系统虚拟串口向蓝牙发送字节

Question

我希望能够通过蓝牙在C ++中发送和接收数据。我发现系统（win 8.1）为配对设备创建了2个虚拟端口。当我尝试使用WriteFile将数据发送到连接端口（“传入”）时，函数返回成功并写入0字节。

我的问题

1. 无法向虚拟BT串口发送和读取字节。
2. 我使用“GetDefaultCommConfig”检查串口是否处于活动状态。它适用于USB UART连接，但有时会因虚拟端口而失败。

我的问题：

1. 我应该连接到2个端口，将字节写入“传出”并监听 “传入”端口？
2. 我的代码应该如何更改以解决我的问题？
3. 为什么Windows会为蓝牙创建2个串口？

代码：

#define _CRT_SECURE_NO_WARNINGS
#include "rs232.h"

using namespace std;

HANDLE Cport;

string comName;
char comport[14];
char baudr[64];

bool OpenComport(char *portCOM, int baudrate, int useDtrControl, string &refErrors)
{
    char errors[200];

    sprintf(comport, "\\\\.\\%s", portCOM);

    switch(baudrate)
    {
        case     110 : strcpy(baudr, "baud=110 data=8 parity=N stop=1");
                       break;
        case     300 : strcpy(baudr, "baud=300 data=8 parity=N stop=1");
                       break;
        case     600 : strcpy(baudr, "baud=600 data=8 parity=N stop=1");
                       break;
        case    1200 : strcpy(baudr, "baud=1200 data=8 parity=N stop=1");
                       break;
        case    2400 : strcpy(baudr, "baud=2400 data=8 parity=N stop=1");
                       break;
        case    4800 : strcpy(baudr, "baud=4800 data=8 parity=N stop=1");
                       break;
        case    9600 : strcpy(baudr, "baud=9600 data=8 parity=N stop=1");
                       break;
        case   19200 : strcpy(baudr, "baud=19200 data=8 parity=N stop=1");
                       break;
        case   38400 : strcpy(baudr, "baud=38400 data=8 parity=N stop=1");
                       break;
        case   57600 : strcpy(baudr, "baud=57600 data=8 parity=N stop=1");
                       break;
        case  115200 : strcpy(baudr, "baud=115200 data=8 parity=N stop=1");
                       break;
        case  128000 : strcpy(baudr, "baud=128000 data=8 parity=N stop=1");
                       break;
        case  256000 : strcpy(baudr, "baud=256000 data=8 parity=N stop=1");
                       break;
        default      : printf(errors, "invalid baudrate: %d", baudrate);

                       refErrors = errors;
                       return(false);
    }

    Cport = CreateFileA(comport,
                      GENERIC_READ|GENERIC_ReadWRITE,
                      0,                          /* no share  */
                      NULL,                       /* no security */
                      OPEN_EXISTING,
                      0,                          /* no threads */
                      NULL);                      /* no templates */

    if(Cport == INVALID_HANDLE_VALUE)
    {
        sprintf(errors, "Unable to open comport. Error code: %ld", GetLastError());

        refErrors = errors;
        return(false);
    }

    DCB port_settings;
    memset(&port_settings, 0, sizeof(port_settings));  /* clear the new struct  */
    port_settings.DCBlength = sizeof(port_settings);

    //use DTR control if specified. Disabled by default.
    port_settings.fDtrControl = useDtrControl ? DTR_CONTROL_ENABLE : DTR_CONTROL_DISABLE;

    if(!BuildCommDCBA(baudr, &port_settings))
    {
        sprintf(errors, "Unable to set comport dcb settings.Error code: %ld", GetLastError());

        refErrors = errors;
        CloseHandle(Cport);

        return(false);
    }

    if(!SetCommState(Cport, &port_settings))
    {
        sprintf(errors, "Unable to set comport cfg settings. Com port will be closed. Error code: %ld", GetLastError());
        refErrors = errors;

        CloseHandle(Cport);

        return(false);
    }

    COMMTIMEOUTS Cptimeouts;

    Cptimeouts.ReadIntervalTimeout         = MAXDWORD;
    Cptimeouts.ReadTotalTimeoutMultiplier  = 0;
    Cptimeouts.ReadTotalTimeoutConstant    = 0;
    Cptimeouts.WriteTotalTimeoutMultiplier = 1;
    Cptimeouts.WriteTotalTimeoutConstant   = 1;

    if(!SetCommTimeouts(Cport, &Cptimeouts))
    {
        sprintf(errors, "Unable to set comport time-out settings. Com port will be closed. Error code: %ld", GetLastError());

        refErrors = errors;
        CloseHandle(Cport);

        return(false);
    }

    comName = portCOM;

    return(true);
}


int PollComport(unsigned char *buf, int size)
{
    int n;

    if(size > 4096)
        size = 4096;

    if(!ReadFile(Cport, buf, size, (LPDWORD)((void *)&n), NULL))
    {
        return (-1);
    }else
    {
        return(n);
    }
}


int SendByte(unsigned char byte)
{
    int n = 0;

    if(WriteFile(Cport, &byte, 1, (LPDWORD)((void *) &n), NULL))
    {
        return(n);
    }else
    {
        return(0);
    }
}


int SendBuf(unsigned char *buf, int size)
{
    int n;

    if(WriteFile(Cport, buf, size, (LPDWORD)((void *)&n), NULL))
    {
        return(n);
    }else
    {
        return(-1);
    }
}

bool CloseComport()
{
    return CloseHandle(Cport);
}

bool isComExists(string portName)
{
    COMMCONFIG CommConfig;
    DWORD size;

    TCHAR strPort[32] = {0};
    _stprintf(strPort, _T("%s"), portName.c_str());

    size = sizeof CommConfig;
    bool result = GetDefaultCommConfig(strPort, &CommConfig, &size);

    return (result == true || result != 0  || size > sizeof CommConfig) ? true : false;
}

Answer 1

您无法使用Microsoft蓝牙堆栈以这种方式读取/发送：您必须使用MSDN中描述的套接字和所有Bth *功能/结构。尝试使用COM端口是不行的！ “传入”端口是为类似服务器的用途而创建的：您正在等待附近设备的传入连接（与您正确配对） “传出”端口是为类似客户端的用途而创建的：您正在“呼叫”附近的设备以连接到它。 但是，无论如何，你应该使用'套接字'并使用它们就像'服务器'或'客户'应用程序; 你可以从这里开始： The Bluetooth Socket in Window