Capture debug information from a dll in C++

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I am running an exe which makes use of a C++ dll and the dll outputs debug information. I can view the output info in the output window of Visual Studio. Can you suggest samples which implement listeners in C++ which can intercept this information and save it to a log file or a buffer. I do not want all the debugging data (for example exe has loaded/unloaded) but only the data that is output from this dll. Is there a way of doing it?

Posted 16-Aug-11 12:14pm

aravind3221

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Solution 1

Here's an article that show you how to capture calls to OutputDebugString:

Mechanism of OutputDebugString[^]

Assuming that's what the DLL is calling, you should be able to make that code work for your purposes.

Posted 16-Aug-11 12:52pm

TRK3

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aravind3221 16-Aug-11 23:04pm

The dll I have does not use OutputDebugString API but uses DbgPrintEx routine to do it though

TRK3 17-Aug-11 13:39pm

Do need this for debugging on your machine?

Or are you trying to create a log file for post mortems in the field?

For debugging, you could try debugview:

http://technet.microsoft.com/en-us/sysinternals/bb896647

I haven't it used it myself, but it sounds like it will capture everything and you can specify filters to filter what it captures.

aravind3221 17-Aug-11 22:01pm

Unfortunately DebugView is an old tool which captures DbgPrint and not the new version of the API.
I found a solution here thopugh:
http://www.debuginfo.com/examples/dbgexamples.html

Thanks for the help

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aravind3221 · Accepted Answer · 2011-08-17T16:02:00

Solution 3

This site has some useful resources
http://www.debuginfo.com/examples/dbgexamples.html

Posted 17-Aug-11 16:02pm

aravind3221