property WriteLogFile.
Writes a line of regular string data (without 0 character) into a log (text) file.
This text file will be created automatically if not exists, and subsequent strings are written
and appended.
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LogFileName
[in] . Full filename
Data
[in] . String
data which must not contain more than 1 linefeed
pVal
[out, retval] The returned value is number of
bytes or 0 if failed.
S_OK
The operation was successfull.
E_POINTER
A NULL pointer was supplied as an argument.
E_UNEXPECTED
An unexpected error occoured.