Question

How can I backtrack the code in VC++ debugger in a case of unhandled exception?

Asked by: star90

HI,
I have a code like:
class network
{
int data3[4];
public:
int get_data(int i);
};

int network::get_data(int i)
{
return data3[i];
}


When I debug my program I get the message :
Unhandled exception at 0x0125ab9 in ver2.exe 0xc0000005: Access violation reading location 0x00000014.
The  yellow arrow points to  return data3[i];

I can't move forward, is there a way to move backwards to see from which line in the program the  get_data(i) function was called?

The only option that I know is to start debugging again with small steps (F10) until I see where it crashes.
Is there a better solution?
Thanks.

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Asked On
2009-07-23 at 10:20:06ID24595443
Tags

VC++.backtrack

,

unhandled exception

Topics

C Programming Language

,

C++ Programming Language

,

Microsoft Visual C++.Net

Participating Experts
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Answers

 

by: Frosty555Posted on 2009-07-23 at 10:27:14ID: 24927711

Look at the call stack, you can see the various calls and how they nested.

The call stack window should be openable by clicking the appropriate icon in the debug toolbar. The icon for it should be near the icons for the watch window / locals / etc.

 

by: Frosty555Posted on 2009-07-23 at 10:31:40ID: 24927765

Note: You can't "back off from the error" in a parent subroutine.

E.g. lets say you had something like this:

1   performaction() {
2         ... blah blah ..
3         x = 5;
4        y = get_data();
5        ... blah blah ...
6   }
7  
8   get_data {
9       ... blah b.ah....
10       return idata[421312];
11  }

If an exception occurred on line 10, you can examine various variables in get_data() like normal, you can also, at your discretion, set the current line to line 8 or 9. That's normal.

You can also use the call stack to back out to line 4, and then you can look at the various variables and their states in the watch window for the performaction() function.

You CANNOT, however, "set the current line" to line 3. Not allowed to do that because you're in a parent function, and doing that would involve unwinding the stack all the way back to the point where performactoin() was called. That's not allowed.

 

by: star90Posted on 2009-07-23 at 10:42:17ID: 24927898

Hi Frosty555,
Thanks for your answer.

20120131-EE-VQP-002

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