The TraceFile property is used to specify the name of the
trace file that is created when network function tracing is enabled.
If this property is set to an empty string, then a file named
CSTRACE.LOG is created in the system's temporary directory. If no
temporary directory exists, then the file is created in the current
If the file exists, the trace output is appended to the file,
otherwise the file is created. Since function tracing is enabled
per-process, the trace file is shared by all instances of the object
being used. Since trace files can grow very quickly, even with modest
applications, it is recommended that you delete the file when it is
no longer needed.
The trace file has the following format:
VB6 INF: WSAAsyncSelect(46, 0xcc4, 0x7e9, 0x27) returned 0
VB6 WRN: connect(46, 192.0.0.1:1234, 16) returned -1 
VB6 ERR: accept(46, NULL, 0x0) returned -1 
The first column contains the name of the process that is being
traced; in this case, it is Visual Basic 6.0. The second column
identifies if the trace record is reporting information, a warning,
or an error. What follows is the name of the function being called,
the arguments passed to the function and the function's return value.
If a warning or error is reported, the error code is included in
If parameters are passed as integer values, they are recorded in
decimal. If the parameter or return value is a memory address, it is
recorded as a hexadecimal value preceded with "0x". Those functions
which expect Internet addresses are displayed in the following
The first four numbers separated by periods represent the IP
address, and the number following the colon represents the port
number in host byte order. Note that in the second line of the above
example, the control is attempting to connect to a system with the IP
address 192.0.0.1 on port 1234.