大家帮我看一段串口监视程序,看有没有问题?

[admireO]

程序的主要流程是:当用户执行开始操作后,监视先程开始工作,由于本程序的特点,要写的数据比较少,所以只开了一个监视线程,程序的流程是:开始(向串口写开始命令)--->收到确认-->写参数---->收到确认----->开始读大量数据(数据交给主线程处理,内存申请在监视线程里,delete在主线程里)我用的是事件驱动也就是当有EV_RXCHAR时开始读.
DWORD WINAPI CComm::ListenProc( LPVOID lpPara )
{
CComm* pComm = (CComm*) lpPara;
HANDLE hComm = pComm->GetCommHandle();
HWND hDestWnd = pComm->GetDesWndHandle();
OVERLAPPED overlap;
overlap.hEvent = ::CreateEvent( NULL,TRUE,FALSE,NULL );
if( overlap.hEvent == NULL )
{
pComm->CloseConnection();
return 0;
}
BOOL bError = FALSE;
int nIndex = 0 ;
while( pComm->IsConnected() )
{
DWORD dwMask = 0;
::GetCommMask( hComm,&dwMask );
if( !(dwMask & EV_RXCHAR) )
::SetCommMask( hComm,EV_RXCHAR );
if( !::WaitCommEvent( hComm,&dwMask,&overlap ) ) //等待事件
{
if( ::GetLastError() == ERROR_IO_PENDING ) //如果暂停了,则等待.
{
BOOL bEnd = FALSE;
HANDLE hEvent[] = { overlap.hEvent,pComm->m_hEnd };
DWORD dwRet = ::WaitForMultipleObjects( 2,hEvent,FALSE,INFINITE );
switch( dwRet )
{
case WAIT_OBJECT_0:
{
if( dwMask & EV_RXCHAR == EV_RXCHAR ) //在此读数据并进行处理.
{
char chFlag = 0;
int nRetLength = 0;
nRetLength = pComm->ReadData( &chFlag,1 );
if( nRetLength == 0 )
continue;
switch( chFlag )
{
case 'M':
{
nIndex = 0;
char * pchTemp = "收到主参数设定信息:M";
int nstrLength = strlen( pchTemp );
char *pBuffer = new char[nstrLength + 1];
if( pBuffer != NULL )
{
strncpy( pBuffer,pchTemp,nstrLength );
*(pBuffer + nstrLength ) = '\0';
::PostMessage( hDestWnd,WM_TRANSFER_DATA,(WPARAM)pBuffer,(LPARAM) 0 );
}
pComm->WriteChanPara( nIndex );
}
break;
case 'C':
{
char * pchTemp = "收到通道参数设定信息:C";
int nstrLength = strlen( pchTemp );
char *pBuffer = new char[nstrLength + 1];
if( pBuffer != NULL )
{
strncpy( pBuffer,pchTemp,nstrLength );
*(pBuffer + nstrLength ) = '\0';
::PostMessage( hDestWnd,WM_TRANSFER_DATA,(WPARAM)pBuffer,(LPARAM) 0 );
}
char chChanFlag;
int nReadLength = pComm->ReadData( &chChanFlag,1 );
if( nReadLength <= 0 )
break;
nIndex++;
if( nIndex > 3 )
{
pComm->WriteStartCommond();
break;
}
else
{
pComm->WriteChanPara( nIndex );
}
}
break;
case 'R':
{
char * pchTemp = "收到开始采集信息:R";
int nstrLength = strlen( pchTemp );
char *pBuffer = new char[nstrLength + 1];
if( pBuffer != NULL )
{
strncpy( pBuffer,pchTemp,nstrLength );
*(pBuffer + nstrLength ) = '\0';
::PostMessage( hDestWnd,WM_TRANSFER_DATA,(WPARAM)pBuffer,(LPARAM) 0 );
}
char chDataFlag;
int nReadLength = pComm->ReadData( &chDataFlag,1 );
if( nReadLength <= 0 )
break;
while( chDataFlag == 'D' )
{
char *pBuffer = new char[14];
if( pBuffer == NULL )
{
bEnd = TRUE;
break;
}
nReadLength = pComm->ReadData( pBuffer,14 );
while( nReadLength < 14 )
{
int nNextRead = pComm->ReadData( pBuffer + nReadLength,14 - nReadLength );
nReadLength += nNextRead;
}
::PostMessage( hDestWnd,WM_TRANSFER_DATA,(WPARAM)pBuffer,14 ); //通知主窗口有数据到达.
char chEndFlag;
nReadLength = pComm->ReadData( &chEndFlag,1 );
if( nReadLength <= 0 )
break;
nReadLength = pComm->ReadData( &chDataFlag,1 );
if( chDataFlag == 'Q' )
bEnd = TRUE; //结束测量.
}
}
break;
case 'D':
{
char chDataFlag = 'D';
while( chDataFlag == 'D' )
{
char *pBuffer = new char[14];
if( pBuffer == NULL )
{
bEnd = TRUE;
break;
}
int nReadLength = pComm->ReadData( pBuffer,14 );
while( nReadLength < 14 )
{
int nNextRead = pComm->ReadData( pBuffer + nReadLength,14 - nReadLength );
nReadLength += nNextRead;
}
::PostMessage( hDestWnd,WM_TRANSFER_DATA,(WPARAM)pBuffer,14 ); //通知主窗口有数据到达.
char chEndFlag;
nReadLength = pComm->ReadData( &chEndFlag,1 );
if( nReadLength <= 0 )
break;
nReadLength = pComm->ReadData( &chDataFlag,1 );
if( chDataFlag == 'Q' )
bEnd = TRUE; //结束测量.
}
}
break;
case 'Q':
{
bEnd = TRUE;
}
break;
case 'E':
{
bEnd = TRUE;
}
break;
case 'P':
break;
case 'Z':
{
char *pBuffer = new char[14];
int nReadLength = pComm->ReadData( pBuffer,14 );
while( nReadLength < 14 )
{
int nNextRead = pComm->ReadData( pBuffer + nReadLength,14 - nReadLength );
nReadLength += nNextRead;
}
::PostMessage( hDestWnd,WM_TRANSFER_ZERO,(WPARAM)pBuffer,14 );
char chEndFlag;
pComm->ReadData( &chEndFlag,1 );
}
break;
default:
break;
}
}
}
break;
case WAIT_OBJECT_0 + 1:
{
::ResetEvent( pComm->m_hEnd );
bEnd = TRUE; //退出
}
break;
default:
break;
}
if( bEnd )
break;
}
else
{
bError = TRUE; //读数据出错.
break;
}
}
}
::CloseHandle( overlap.hEvent );
pComm->m_hThread = NULL;
if( bError )
pComm->CloseConnection();
return 0;
}

[admireO]

程序的关键部分是开始的怎么判断有数据读?不知道事件驱动可不可靠?

[NowCan]

串口程序网上很多的，何必要自己写呢？
当然那些程序用的也都是事件驱动，和你的没什么区别。
不过我在使用时，数据量太大了就不稳定。

[admireO]

怎么没人理,期待大家的关注,

[admireO]

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[admireO]

to NowCan,你的数据量很大是指有多大呢?还有如果不稳定那你是通过什么方法解决的呢?

[admireO]

top

[NowCan]

比如，我接受GPS的输出数据时（每秒输出一次，大约300字节）就会出现问题。我在Win2000的任务管理器看到这个进程的CPU占有率竟达到了70～80％（当然，这个占有率可能是主程序的问题），而且在关闭进程时容易造成进程无响应。这个问题我也一直没解决。你的程序可以试试看。

[admireO]

一次ReadFile,读出300字节吗?那你的波特率用的是多少?

[NowCan]

38400

[NowCan]

我用的是

http://www.csdn.net/expert/Topic/110/110559.shtm

[NowCan]

还看到了你的回复.呵呵.

[sonicss]

admire0：串口中使用了WaitForSingleObject会不会丢数据呀！