1. To get the length of a received fax, use the GetObjFromReceiveQueue() function to get the received fax from the queue. The function returns a FAXOBJ type (a fax object).
Use the GetParam() function of the fax object to retrieve the information about the receivbed fax.
FaxObj->GetParam( sFaxParam );
The TSFaxParam structure contains information such as the Resolution, Width, Length, Compression, etc.
2. The log file is for debugging only. In your application you have to process the event you receive from Fax C++. If an error occur you will get the error code. There is no reason analyzing the log file from your application.