关于串口通讯问题！

HANDLE hEvent=0; 
HANDLE hCom=0;
DCB dcb;
OVERLAPPED OverRead, OverWrite;
COMSTAT comstat;
OVERLAPPED os;
DWORD dwEvtMask=0;
//---------------------------------------------------------------------------
//初始化串口
int __stdcall InitCom(int port,int baud)
{
    AnsiString comname;
    comname="COM"+IntToStr(port);
    CloseHandle(hCom);
    COMMTIMEOUTS CommTimeOuts;
    if(hCom==INVALID_HANDLE_VALUE)
    {
        switch (GetLastError())
        {
            case ERROR_FILE_NOT_FOUND: MessageBox(NULL,"串口不存在！","提示信息",NULL );
                                        break;
            case ERROR_ACCESS_DENIED:  MessageBox(NULL,"串口已被占用！","提示信息",NULL);
                                        break;
        }
        return 0;
    }
    if(hCom!=0)
    {
        return 0;
    }
    hCom=CreateFile(comname.c_str(), //文件名
                     GENERIC_READ|GENERIC_WRITE,//访问模式允许读写
                     0, //此项必须是0
                     NULL,//无安全参数
                     OPEN_EXISTING,//创建方式
                     FILE_FLAG_OVERLAPPED,//异步工作方式
                     NULL);
    if(hCom==INVALID_HANDLE_VALUE)
    {
        ShowMessage("打开串口失败！");
        return 0;
    }
    if(!GetCommState(hCom,&dcb)) //获得串口设置并用它填充dcb结构体
    {
        ShowMessage("获得串口设置失败！");
        return 0;
    }
    if(!SetupComm(hCom,1024,512)) //设置输入输出缓冲区大小
    {
        ShowMessage("设置输入输出缓冲区大小失败！");
        return 0;
    }
    //设置dcb结构成员变量
    dcb.BaudRate=baud;
    dcb.fParity=0;
    dcb.Parity=NOPARITY;
    dcb.StopBits=ONESTOPBIT;
    dcb.ByteSize=8;
    dcb.fNull=FALSE;

    dcb.fInX=true;
    dcb.fOutX=true;
    dcb.XonLim=1;
    dcb.XoffLim=1;
    dcb.fRtsControl=RTS_CONTROL_DISABLE;
    if(!SetCommState(hCom,&dcb)) //重新配置串口
    {
        ShowMessage("配置串口失败！");
        return 0;
    }
    //获取串行口超时参数
    GetCommTimeouts(hCom,&CommTimeOuts);
    CommTimeOuts.ReadIntervalTimeout=0xFFFFFFFF;
    CommTimeOuts.WriteTotalTimeoutConstant=5000;
    if(!SetCommMask(hCom,EV_RXCHAR))
    {
        ShowMessage("设置事件掩码失败！");
        return 0;        
    }
    SetCommTimeouts(hCom,&CommTimeOuts); // 设置超时
    memset(&OverRead,0,sizeof(OVERLAPPED));
    memset(&OverWrite,0,sizeof(OVERLAPPED));
    OverRead.hEvent=CreateEvent(NULL,true,false,NULL);
    OverWrite.hEvent=CreateEvent(NULL,true,false,NULL);
    OverWrite.Offset=0;
    OverWrite.OffsetHigh=0;
}
//向串口写数据
void __fastcall Sendsms(void* chStr,,unsigned long StrLen)
{
    unsigned long Written ;
    BOOL WriteState=WriteFile(hCom,
                          chStr,
                          StrLen,
                          &Written
                          &OverWrite);
    if((!WriteState || StrLen!=Written) && (GetLastError()==ERROR_IO_PENDING))
    {
         //ShowMessage("错误！");
    }
}
//-----------------------------------------------------------------------------
为什么总是不能向串口写入(AT命令)数据呢？请指点一下，谢谢！

3 个解决方案

#1

__stdcall ??

#2

全部改成__fastcall 试试

#3

还是不行啊