Advantech PCI-1682U Bedienungsanleitung PDF herunterladen (Seite 49)

43 PCI-1680U/1682U User Manual

Chapter 4 Software Requirements

Return Value

Successful: return non-zero values. Unsuccessful: return zero value. Please call Get-

LastError function.

If users cancel the operation or reset chip, GetLastError will be called to return

ERROR_OPERATION_ABORTED.

In asynchronous mode, operation will be pending if drivers cannot complete user's

request, and GetLastError will be called to return ERROR_IO_PENDING.

See MSDN for more information.

Example

Wait event in synchronous mode.

BOOL bSuccess = SetCommMask(hDevice, EV_ERR | EV_RXCHAR);

if(!bSuccess)

{

//error

}

DWORD dwMask = 0;

bSuccess = WaitCommEvent(hDevice, &dwMask, NULL);

if(bSuccess)

{

if(dwMask & EV_ERR)

{

//to do

DWORD dwError;

ClearCommError(hDevice, &dwError, NULL);

}

if(dwMask & EV_RXCHAR)

{

//to do

}

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Advantech PCI-1682U Bedienungsanleitung Seite 49