Advantech PCI-1682U Manual de usuario descargar pdf (Pagina 43)

37 PCI-1680U/1682U User Manual

Chapter 4 Software Requirements

Return Value

It will be considered successful if non-zero values are returned in the following situa-

tions:

1. The driver reads data and there is no data in the receive buffer. At this time, the

data received is less than the requested data.

2. The driver reads all the requested data.

3. The driver can not read any data and time is out.

It will be considered unsuccessful if zero values are returned in the following situa-

tions. Please call GetLastError.

If users cancel the operation or reset chip while drivers are receiving data, GetLas-

tError will be called to return ERROR_OPERATION_ABORTED.

If busoff of device is discovered before drivers read any frames, GetLastError will be

called to return ERROR_GEN_FAILURE.

If drivers cannot allocate resources according to the number defined by the third

parameter frame, GetLastError will be called to return

ERROR_INVALID_PARAMETER.

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

read request, and GetLastError will be called to return ERROR_IO_PENDING.

See MSDN for more information.

Example

Read one frame data in synchronous mode.

DWORD dwRead;

canmsg_t ReadBuffer;

ZeroMemory(&ReadBuffer, sizeof(canmsg_t));

BOOL bSuccess = ReadFile(hDevice, &ReadBuffer, 1, &dwRead,

0);

if(bSuccess)

{

if(dwRead == 1)

{

//SUCCESS

if(ReadBuffer.flags & MSG_EXT)

{

//Extended frame

}

else{

//Standard frame

}

if(ReadBuffer.flags & MSG_RTR)

{

//Remote frame

}

if(ReadBuffer.flags & MSG_SELF)

{

//self reception

}

if(ReadBuffer.flags & MSG_BOVR)

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