wince5.0串口读写问题

[puyoupuyou90]

我要在wince5.0上实现一个串口转发的程序，就是将一个COM7上收到的数据转发到COM6，COM6收到的数据转发到COM7，一个字节一个字节转发就可以，但非常的慢，我用SetCommMask()，WaitCommEvent()，ClearCommError()，这几个函数，就不起作用串口的数据有时候会接收不到，谁有什么好办法么？
我把实现的代码贴出来：

//我把串口的打开和线程的创建放在初始化函数中
BOOL CTransServiceDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	CenterWindow(GetDesktopWindow());	// center to the hpc screen

	// TODO: Add extra initialization here
	pDlg = this ;


	Stat = m_com7.SerOpen(EXTERNAL_COMPORT, 115200, NOPARITY, 8);
	sbuf.Format(L"open return: %02x",Stat);
	pDlg->m_EditResp.ReplaceSel(sbuf);
	
	if(Stat != 0)
	{
		sbuf.Format(L"open port 7 failed");
		pDlg->m_EditResp.ReplaceSel(sbuf);
	}
	Stat = m_com6.SerOpen(USIP_COMPORT, 115200, NOPARITY, 8);
	sbuf.Format(L"open return: %02x",Stat);
	pDlg->m_EditResp.ReplaceSel(sbuf);
	
	if(Stat != 0)
	{
		sbuf.Format(L"open port 6 failed");
		pDlg->m_EditResp.ReplaceSel(sbuf);
	}

	h_usip_sr = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)usip_SendReceive,
							NULL, 0, &dwThreadId_h_usip_sr); 		 
	if(!h_usip_sr)
		AfxMessageBox(_T("usip send receive线程创建失败"));
	h_pda_sr = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)pda_SendReceive,
							NULL, 0, &dwThreadId_h_pda_sr); 		 
	if(!h_pda_sr)
		AfxMessageBox(_T("usip send receive线程创建失败"));

	return TRUE;  // return TRUE  unless you set the focus to a control
}

//com6转发到com7
void WINAPI usip_SendReceive(LPVOID lpParam)
{
	
#if 0
//这里原来是一个字节一个字节转发的 可以实现但非常的慢
	BYTE ch,iret;
	while(1)
	{
		
		iret = m_com6.ReceiveByte(&ch, 20);
		if(iret!=0) 
		{
			Sleep(1);
			continue;
		}
		//Lib_Lcdprintf(" -%c- ",ch);
		m_com7.SerWrite(&ch,1,20);
	}
#else
//这里后来改的 看看有什么问题没有
	COMSTAT	cmState;
	DWORD evtMask=0;
	DWORD dwReadErrors;
	int iret ;
	int temp;

	SetCommMask(m_com6.m_CommPort, EV_RXCHAR);
	
	byte buff[4096];
	memset(buff,0x00,4096);
	m_com6.ResetPort();
	while(TRUE)
	{
		Sleep(1);
		if(WaitCommEvent(m_com6.m_CommPort,&evtMask,NULL))
		{
			ClearCommError(m_com6.m_CommPort,&dwReadErrors,&cmState);
			if (cmState.cbInQue >0)
			{
				temp = cmState.cbInQue;
				iret = m_com6.SerRead(buff,temp,20);
				//SaveSend(buff, temp);	
				iret = m_com7.SerWrite(buff,temp,20);
				memset(buff,0x00,4096);
			}
		}
	}
#endif
}


//com7转发到com6
void WINAPI pda_SendReceive(LPVOID lpParam)
{

#if 0
	BYTE ch,iret;
	while(1)
	{
		iret = m_com7.ReceiveByte(&ch, 20);
		if(iret!=0)
		{
			Sleep(1);
			continue;
		}

		m_com6.SerWrite(&ch,1,20);
	}
#else
	COMSTAT	cmState;
	DWORD evtMask=0;
	DWORD dwReadErrors;
	int temp;
	int iret ;
	
	SetCommMask(m_com7.m_CommPort, EV_RXCHAR );
	
	byte buff[4096];
	memset(buff,0x00,4096);

	while(TRUE)
	{
		Sleep(1);
		if(WaitCommEvent(m_com7.m_CommPort,&evtMask,NULL))
		{
			ClearCommError(m_com7.m_CommPort,&dwReadErrors,&cmState);
			if (cmState.cbInQue > 0)
			{
				temp = cmState.cbInQue;
				iret = m_com7.SerRead(buff,temp,20);
				iret = m_com6.SerWrite(buff,temp,20);
				memset(buff,0x00,1024);
			}
		}
	}


#endif

}

[puyoupuyou90]

自己先顶了~~~~

[puyoupuyou90]

我的代码写有没有问题啊？

[puyoupuyou90]

没人踩么？