The TraceFile property is used to specify the name of the
trace file that is created when socket function tracing is enabled.
If this property is set to an empty string (the default value), 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 working directory.
If the file exists, the trace output is appended to the file,
otherwise the file is created. Since socket function tracing is
enabled per-process, the trace file is shared by all instances of the
controls being used. If multiple controls have tracing enabled, the
TraceFile property should be set to the same value for each
control. 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 [10035]
VB6 ERR: accept(46, NULL, 0x0) returned -1 [10038]
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 appended to the
record (the value is placed inside brackets).
If parameters are passed as integer values, they are recorded in
decimal. If the parameter or return value is a pointer (a memory
address), it is recorded as a hexadecimal value preceded with
"0x". A special type of pointer, called a null pointer, is
recorded as NULL. Those functions which expect socket addresses are
displayed in the following format:
aa.bb.cc.dd:nnnn
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.
Note that if the specified file cannot be created, or the user
does not have permission to modify an existing file, the error is
silently ignored and no trace output will be generated.