even if i change the values of commtimeouts to

GetCommTimeouts(m_comPortHandle, &sCommTimeOuts);
sCommTimeOuts.ReadIntervalTimeout = 100; //[ms]
sCommTimeOuts.ReadTotalTimeoutMultiplier = 10; //[ms]
sCommTimeOuts.ReadTotalTimeoutConstant = 500; //[ms]
sCommTimeOuts.WriteTotalTimeoutMultiplier = 10; //[ms]
sCommTimeOuts.WriteTotalTimeoutConstant = 100; //[ms]
SetCommTimeouts(m_comPortHandle, &sCommTimeOuts);

i dint observe any change.

sorry, i dint get you

Even after modification also, iam not able to collect the data The serial port timeouts are

GetCommTimeouts(m_comPortHandle, &sCommTimeOuts);
sCommTimeOuts.ReadIntervalTimeout = 5;//100; //[ms]
sCommTimeOuts.ReadTotalTimeoutMultiplier = 1;//10; //[ms]
sCommTimeOuts.ReadTotalTimeoutConstant = 1;//500; //[ms]
sCommTimeOuts.WriteTotalTimeoutMultiplier = 1;//10; //[ms]
sCommTimeOuts.WriteTotalTimeoutConstant = 1;//100; //[ms]
SetCommTimeouts(m_comPortHandle, &sCommTimeOuts);

Thanks & Regards, Praveen

the value received by the ulLengthReceived is 0.

void CER2TSerialDlg::OnStartThread()
{
CWinThread *pThread = NULL;
m_SerialCommn->bOpen()
pThread = AfxBeginThread((AFX_THREADPROC)ReadFromModuleThread,NULL);
}

UINT CER2TSerialDlg::ReadFromModuleThread(LPVOID pPARAM)
{
unsigned char ucLengthExpected=10;
char chBuffer[FIFO_SIZE]={0};
unsigned short usReceived=0;

while(TRUE)
{
m_SerialCommn->bReceiveBytes(chBuffer,ucLengthExpected,&usReceived);
}
return 0;
}

bool CSerialPort::bReceiveBytes(char* x_pcBuffer,
unsigned short x_usLengthExpected,
unsigned short *x_pusLengthReceived )
{

unsigned long ulLengthReceived=0;
int iResult;
iResult = ReadFile(m_comPortHandle,
x_pcBuffer[0],
x_usLengthExpected,
ulLengthReceived,
NULL );
DWORD err1 = GetLastError();
*x_pusLengthReceived = (unsigned short)ulLengthReceived;
return( iResult );

}/

Regards praveen

modified on Wednesday, June 11, 2008 1:48 AM

hello, thanks for your reply... even though if i replace x_pcBuffer instead of x_pcBuffer[0], i dint get any data into the buffer. but here the return values for ReadFile is 1 but iam unable to capture the data.. Thanks & Regards, praveen

Iam calling this function for capturing data. The ReadFile() returns 0 value and GetLastError() gives error 995 bool CSerialPort::bReceiveBytes( unsigned char* x_pcBuffer, unsigned short x_usLengthExpected, unsigned short *x_pusLengthReceived ) { bool bResult = FALSE; unsigned long ulLengthReceived=0; int iResult; iResult = ReadFile( m_comPortHandle, x_pcBuffer[0], x_usLengthExpected, &ulLengthReceived, NULL ); DWORD err1 = GetLastError(); *x_pusLengthReceived = (unsigned short)ulLengthReceived; return( bResult ); }

hi one and all, iam having a problem with accessing serial port in my pc. i have developed an application which access the serial port in VC++ 6.0.After configuring the Serial port to 115200, iam able to send the data to the com port using WriteFile().But, iam unable to receive the data from the com port through ReadFile() operation and i have checked the error by using GetLastError() and it is given as 995(system error code).Even though i have restarted my system several times,iam unable to debug. Please help me why this error is getting and how to fix this error? Thanks in advance Regards, Praveen

modified on Monday, June 9, 2008 8:23 AM

hi one and all, iam having a problem with accessing serial port in my pc. i have developed an application which access the serial port in VC++ 6.0.After configuring the Serial port to 115200, iam able to send the data to the com port using WriteFile().But, iam unable to receive the data from the com port through ReadFile() operation and i have checked the error by using GetLastError() and it is given as 995(system error code).Even though i have restarted my system several times,iam unable to debug. Please help me why this error is getting and how to fix this error? Thanks in advance Regards, Praveen

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