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Try / catch [message #12418]

Mon, 29 October 2007 10:56

pippo
Messages: 17
Registered: October 2007
Location: Italy

Promising Member

Hello guru!
I have a question: try/catch handles only throw command or all exceptions?

I write this code:

int main()
{
   printf("start\n");
   try
   {
      int a = 0;
      int b = 0 / a;
   }
   catch(...)
   {
      printf("error\n");
   }
   printf("end\n");
   return(0);
}

Then, my program crash at line with "b=0/a".
With Ubuntu and U++ (debug mode and release mode)
and also with Windows Xp and Microsoft Visual Studio!!!
(Visual studio show a pop-up, to inform about exception).

WHY???

But, if I insert a "throw", then it jump correctly to catch(...).
I must verify all possible errors and insert my "throw"??? I don't belive!!!
Maybe I must active some flag?

10aa3a8774daeb994a88cc07572e2b6c

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Re: Try / catch [message #12419 is a reply to message #12418]

Mon, 29 October 2007 11:37

cbpporter
Messages: 1428
Registered: September 2007

Ultimate Contributor

On Windows Xp, U++ dev 10, it displays the correct functionality and there where no crashes. But if I try to debug it in a line-by-line mode, once it hits the exception, the cursor no longer moves when I press F10. Is step-over/step-through not supported after an exception?

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Re: Try / catch [message #12426 is a reply to message #12418]

Tue, 30 October 2007 09:37

mirek
Messages: 14271
Registered: November 2005

Ultimate Member

pippo wrote on Mon, 29 October 2007 05:56

Hello guru!
I have a question: try/catch handles only throw command or all exceptions?

I write this code:

int main()
{
   printf("start\n");
   try
   {
      int a = 0;
      int b = 0 / a;
   }
   catch(...)
   {
      printf("error\n");
   }
   printf("end\n");
   return(0);
}

C++ and system exception are not the same thing.

Mirek

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Re: Try / catch [message #12427 is a reply to message #12419]

Tue, 30 October 2007 09:39

mirek
Messages: 14271
Registered: November 2005

Ultimate Member

cbpporter wrote on Mon, 29 October 2007 06:37

Well, when exception occurs, it stops at instruction that caused exception. F10 tries to perform it again - this is standard behaviour with all debugers I know...

If you want to skip it (which most likely will break the program logic anyway), you need to change the IP.

Mirek

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Re: Try / catch [message #12432 is a reply to message #12427]

Tue, 30 October 2007 12:26

mdelfede
Messages: 1310
Registered: September 2007

Ultimate Contributor

luzr wrote on Tue, 30 October 2007 09:39

In theory (IMHO) the debugger should step to catch block... I don't know very well GDB, but the Borland debugger had options to catch exceptions OR to leave the handling to the debugged program.

Ciao

Max

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