How to create minidump for my process when it crashes?

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You need to programatically create a minidump (with one exception, see next link). CodeProject has a nice article on MiniDumps. Basically, you want to use dbghelp.dll, and use the function MiniDumpWriteDump() (see MSDN on MiniDumpWriteDump).

How effective such dumps are depends very much on the application. Sometimes, for optimized binaries, they are practically useless. Also, without experience, heap/stack corruption bugs will lead you astray.

However, if the optimizer was not too hard on you, there is a large class of errors where the dumps do help, namely all the bugs where having a stack-trace + values of the locally used variables is useful, i.e. many pure-virtual-function call things (i.e. wrong destruction order), access violations (uninitialized accessed or missing NULL checks), etc.

BTW, if your maintenance policy somehow allows it, port your application from VC6 to something acceptable, like VC8 or 9. You’ll do yourself a big favor.

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