tlhelp32 problem

Hi!

While trying to get Anarchy Online working with Wine, I discovered
that dynamically getting symbols from the running program does not
work properly in Wine.

The attached example code shows the problem; when running in Windows,
I get this output

The mangled name is "?Instantiate@MyTestClass@@SAPAV1@PAVObjectArchive_c@fun@@@Z"
  Searching in "ntdll.dll"
  Searching in "kernel32.dll"
  Searching in "Factory.dll"
  Searching in "MSVCP60D.dll"
  Searching in "MSVCRTD.dll"
  Searching in "Test.dll"
  Found the function at 00321023
  Creating a new object!
  The returned text is "Found the right one!"

whereas when running this in Wine, this is the output

[andrej@rivendell tst]$ PATH=$PATH:$PWD wine tst
  The mangled name is "?Instantiate@MyTestClass@@SAPAV1@PAVObjectArchive_c@fun@@@Z"
  Searching in ""
  Searching in ""
  Searching in ""
  Searching in ""
  Searching in ""
  Searching in ""
  Searching in ""
  Searching in ""
  The returned text is "<function for "MyTestClass" not found>"

If the test for a ".dll" ending is removed (as can be seen in the
output, the name returned is empty, so it will always fail), this is
the output

[andrej@rivendell tst]$ PATH=$PATH:$PWD wine tst
  The mangled name is "?Instantiate@MyTestClass@@SAPAV1@PAVObjectArchive_c@fun@@@Z"
  Searching in ""
  Searching in ""
  Found the function at 0x408a9023
  Creating a new object!
  The returned text is "Found the right one!"

(If anybody needs the compiled code, and/or MSDS project files, please
contact me directly.)

[Eric Pouech]

André Johansen a écrit :
> Hi!
>
> While trying to get Anarchy Online working with Wine, I discovered
> that dynamically getting symbols from the running program does not
> work properly in Wine.

what doesn't work is that toolhelp (in wine) doesn't properly set the 
szModule of the MODULEENTRY structure. But, since the rest of the fields 
are correctly set, this explains why your test work when you remove the 
test on the module ending with ".dll". If you'd use szExePath field 
instead of the szModule one, it'd work too.

I'll a fix later on for setting the szModule field.

A+

* Eric Pouech (Sun, 16 May 2004 08:20:01 +0200) wrote:
| André Johansen a écrit :
| > Hi!
| > While trying to get Anarchy Online working with Wine, I discovered
| > that dynamically getting symbols from the running program does not
| > work properly in Wine.
| what doesn't work is that toolhelp (in wine) doesn't properly set the
| szModule of the MODULEENTRY structure. But, since the rest of the
| fields are correctly set, this explains why your test work when you
| remove the test on the module ending with ".dll". If you'd use
| szExePath field instead of the szModule one, it'd work too.
| 
| I'll a fix later on for setting the szModule field.

I've implemented a solution for the problem, please review carefully
as I don't know Wine nor Win32 too well!

It might be overly complex, but I don't quite know the constant sizes
or whether or not the executable path always has to contain a
delimiter, so I've played the safe game.

I've also changed some of the other fields; according to MSDN:
* th32ModuleID should be 1
* GlblcntUsage and ProccntUsage should be 0xFFFF
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/moduleentry32_str.asp

[Eric Pouech]

> I've implemented a solution for the problem, please review carefully
> as I don't know Wine nor Win32 too well!

sounds quite ok. I've attached my version of (basically same stuff, 
written a bit differently).
Note:
- the info from MSDN are likely to be for latest versions of toolhelp. 
Anyway, when we run Wine in Win9x mode, the th32ModuleID, GlblcntUsage, 
ProccntUsage have real meaning, so they still require a FIXME (even if 
the values from MSDN make more sense than the ones in place).
- don't use const int, it will create unncessary variables
A+