串口异步读写问题

[ameliawuxi]

DWORD WINAPI SerialPort1ThreadProcess( HWND hWnd) //主窗口句柄
{
DWORD dwEvtMask = 0;
OVERLAPPED osRead = {0};
CSerialPortAPIDlg *pdlg = (CSerialPortAPIDlg*)CWnd::FromHandle(hWnd);
WaitCommEvent(pdlg->hCom, &dwEvtMask, &osRead);
SetCommMask(pdlg->hCom, EV_RXCHAR| EV_TXEMPTY);
if((dwEvtMask&EV_RXCHAR)==EV_RXCHAR)
{
COMSTAT comstat;
DWORD dwlength;
DWORD dwbytesread; //读取的字节数
DWORD dwerror;
DWORD *lpRead=NULL;
DWORD dwerrorflags;
ClearCommError(pdlg->hCom, &dwerrorflags, &comstat);
dwlength = comstat.cbInQue;
if(dwlength>0)
{
BOOL freadstat;
freadstat = ReadFile(pdlg->hCom, lpRead, dwlength, &dwbytesread, &osRead);
if(! freadstat)
{
if(GetLastError()==ERROR_IO_PENDING)
{
while(!GetOverlappedResult(pdlg->hCom, &osRead, &dwbytesread, true))
{
dwerror=GetLastError();
if(dwerror==ERROR_IO_INCOMPLETE)
continue;
::PostMessage((HWND)hWnd, COM_RECVDATA, (unsigned int)lpRead, dwbytesread);
}
}
}
}
}
return true;
}


初学，现在程序编译通过，但是读写还是不成功，郁闷，因为比较急就请大家帮下忙，谢谢！

[ameliawuxi]

怎么没有人理我，还是太简单了大家都不屑了。

[Lstyk]

你的线程中没有等待函数啊，也没有一直在执行！
开了线程立即就返回了，根本等不到都串口吧。
建议你从网上下一个CSerialPort类看看，别人封装的串口操作。

[mybabyanddear]

// 线程主执行体
DWORD __thread_serialport_workproc_main(LPVOID lParam)
{
if( lParam == NULL )
{
return -1;
}
CSerialPort::CtlParam& ctp = *( (CSerialPort::CtlParam*)lParam );
CSerialPort::IoParam iop;

BOOL bThreadExit = FALSE;
DWORD dwEvtMask;

iop.pIoOwner = ctp.pOwner;
iop.hIo = ctp.hComm;
iop.rbuf.cbBuf = 0;
iop.rbuf.len = 0;
iop.rbuf.pbuf = NULL;
iop.wbuf.cbBuf = 0;
iop.wbuf.len = 0;
iop.wbuf.pbuf = NULL;

iop.eol.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
iop.eol.Internal = 0;
iop.eol.InternalHigh = 0;
iop.eol.Offset = 0;
iop.eol.OffsetHigh = 0;

iop.rol.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
iop.rol.Internal = 0;
iop.rol.InternalHigh = 0;
iop.rol.Offset = 0;
iop.rol.OffsetHigh = 0;

HANDLE evts_driver[] =
{
ctp.hEvtExitThread, // 线程退出
ctp.hEvtDrivThread // 驱动运行
};

HANDLE evts_transp[] =
{
ctp.hEvtExitThread, // 线程退出
iop.eol.hEvent, // 串口重叠
iop.rol.hEvent // 读重叠
};

while( !bThreadExit )
{
{// 线程主驱动控制
DWORD dwRes = WaitForMultipleObjects( 2, evts_driver, FALSE, INFINITE );
ResetEvent( evts_transp[ dwRes - WAIT_OBJECT_0 ] );
if( dwRes == WAIT_OBJECT_0 )
{
bThreadExit = FALSE;
continue; // break;
}

}// 线程主驱动控制

{// 业务处理
ResetEvent(iop.eol.hEvent);
WaitCommEvent( iop.hIo, &dwEvtMask, &iop.eol );

DWORD dwRes = WaitForMultipleObjects( 3, evts_transp, FALSE, 10000 );
if( dwRes != WAIT_TIMEOUT )
{
if( WaitForSingleObject( ctp.hEvtExitThread, 0 ) == WAIT_OBJECT_0 )
{// 退出线程
ResetEvent( ctp.hEvtExitThread );
bThreadExit = TRUE;
}
if( WaitForSingleObject( iop.eol.hEvent, 0 ) == WAIT_OBJECT_0 )
{// 通信口事件
ResetEvent( iop.eol.hEvent );
__thread_serialport_workproc_subproc_comevent( dwEvtMask, LPARAM(&iop) );
}
if( WaitForSingleObject( iop.rol.hEvent, 0 ) == WAIT_OBJECT_0 )
{// 重叠读完成
ResetEvent( iop.rol.hEvent );
__thread_serialport_workproc_subproc_RolComplete( 0, LPARAM(&iop));
}
}
}// 业务处理
}

// 关闭重事件量
CloseHandle( iop.eol.hEvent );
CloseHandle( iop.rol.hEvent );

// 释放缓冲区
if( iop.rbuf.pbuf )
{
delete []iop.rbuf.pbuf;
}
if( iop.wbuf.pbuf )
{
delete []iop.wbuf.pbuf;
}
return 0;
}

[mybabyanddear]

没时间细讲,我监测程序串口通信的主驱部分,自己看

[ameliawuxi]

请问异步通信能不能不用线程做的啊，我初学，感觉有点复杂！

[ameliawuxi]

哪位好心人，赐教一下啦，急

[ameliawuxi]

我现在没有用线程来写，读数据是没有问题，但是发数据通不过，明明缓存中已经有要发送数据了，就是写不出去，不知道是什么原因。大家帮忙看一下！