run-time error and program crash

How can I specify a separate function which will be called automatically at Run-Time error to prev开发者_开发技巧ent program crash?

Best thing as mentioned already is to identify the area where the crash ic occuring and then fix the piece of code. This is the idealistic approach.

In case you are unable to find that out another alternative is to do structured exception handling in the areas where you suspect crashes to occur. Once the crash occurs you capture what ever data you want and process it. Meanwhile you can change the settings in windows service manager to restart your application whenever it crashes. Hope this answers your question.

Also in case you are looking for methods to capture the crash and analyse debugdiag and windbg are some of the standard tools that people use to take the crash dumps.

If your in Windows you need to write your own custom runtime check handler. Use:

 _RTC_SetErrorFunc 

to install your custom function in place of

_CrtDbgReport.  

Here is a good article on how to do it:

http://msdn.microsoft.com/en-us/library/40ky6s47(VS.71).aspx

If by run-time error you mean an unhandled exception, don't do it. If an unhanded exception propagates through your code, you want your app to crash. Maybe create a dumpfile on the way down, sure. But the last thing you want to do is catch the exception, do nothing, and continue running as if nothing had happened in the first place.

When an exception is generated, whatever caused the problem could have had other effects. Like blowing the stack or corrupting the heap. If you were to silently ignore these exceptions and continue running anyway, your app might run for a while and seem OK, but something underneath is unstable. Memory could be corrupt, resources might not be available, who knows. You will eventually crash. Bu ignoring unhandled exceptions and running anyway, all you do is delay the inevitable, and make it that much more difficult to diagnose the real problem, because when you do crash, the stack will be in a totally different and probably unrelated place from what caused the initial problem.