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CoClassSyms

Tool name: CoClassSyms
Rating: 0.0 (0 votes)
Author: Matt Pietrek                        
Website: http://www.microsoft.com/msj/0399/comtype/comtype.aspx
Current version: 1.0
Last updated: March 1999
Direct D/L link: Locally archived copy
License type: Free / Open Source
Description: "CoClass" in the "CoClassSyms" name refers to the TKIND_COCLASS entries in the typelib from which the symbols are created. CoClassSyms is a command-line program that operates on executable files containing a type library. This can be an .OCX or some other DLL such as MSHTML.DLL (which is a core component of Microsoft Internet Explorer).

The output from CoClassSyms is either a .MAP or .DBG file. The code included with this article only supports .MAP file generation. However, if you drop in the DLL from this month's Under the Hood column, CoClassSyms generates a .DBG file instead. In either case, the output file has the same root file name as the input executable. Thus, running CoClassSyms on MSHTML.DLL creates MSHTML.MAP or MSHTML.DBG.

Regardless of whether you make a .MAP or .DBG file, you'll no doubt want to get the debugger to recognize and load the symbol information. If you generate a .DBG file, make sure it is in the same directory as the associated executable. In my experience, the Visual Studio 6.0 debugger automatically loads the .DBG file as needed. Using WinDBG, I had to explicitly load the .DBG file in the command window. I wasn't able to get Visual Studio 5.0 to load the .DBG file, but I couldn't determine the cause of the problem.

If everything goes well and the debugger loads your generated .DBG file, you should be able to set breakpoints by name on the methods. (Hint: you may want to first generate a .MAP file to get an idea of the available method names.) Of course, since you likely don't have source code for the executable, you'll be in the assembly language view when the breakpoints hit. You should also see method names in the call stack.
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