viewing declared struct objects using gdb

Lynux-Penguin · 07-20-2003, 03:01 PM

lets say I have a program resembling:

Code:

#include <stdio.h>
struct blah
{
	int id;
	char* user;
};

int main()
{
	struct blah mystrct;
	mystrct.id = 1;
	mystrct.user = "hi there\n";
	fprintf(stdout,mystrct.user);
	return 0;
}

And I am trying to debug this with GDB, how could I view the variable
mystrct.user or mystrc.id
assuming I have a breakpoint at fprintf.
when typing print mystrct or mystrct.user it says cannot view struct objects or something.
Would I have to pick apart the stack?

-LC

Lynux-Penguin · 07-20-2003, 06:46 PM

err
hehehe-
^_^

Turns out that the part I was trying to debug wouldn't have helped anyway, I did this stupid thing earlier which caused a seg-fault:

Code:

fp = fopen("somefile.txt","rw");
fprintf(fp,"blah");
fclose(fp);

ooh boy, that was fun, I thought the whole time it was with a struct's string and a buffer overflow...
I can't believe I made that mistake either, but thanks for the help, I'll use that when I need to. But, I couldn't find out how to display members of a struct. Oh well-

-LC

07-20-2003, 03:01 PM	#1
Lynux-Penguin Comment your source code! Join Date: Apr 2002 Posts: 533	viewing declared struct objects using gdb lets say I have a program resembling: Code: #include <stdio.h> struct blah { int id; char* user; }; int main() { struct blah mystrct; mystrct.id = 1; mystrct.user = "hi there\n"; fprintf(stdout,mystrct.user); return 0; } And I am trying to debug this with GDB, how could I view the variable mystrct.user or mystrc.id assuming I have a breakpoint at fprintf. when typing print mystrct or mystrct.user it says cannot view struct objects or something. Would I have to pick apart the stack? -LC __________________ Asking the right question is sometimes more important than knowing the answer. Please read the FAQ C Reference Card (A MUST!) Pointers and Memory The Essentials CString lib
Lynux-Penguin is offline

07-20-2003, 06:46 PM	#2
Lynux-Penguin Comment your source code! Join Date: Apr 2002 Posts: 533	err hehehe- ^_^ Turns out that the part I was trying to debug wouldn't have helped anyway, I did this stupid thing earlier which caused a seg-fault: Code: fp = fopen("somefile.txt","rw"); fprintf(fp,"blah"); fclose(fp); ooh boy, that was fun, I thought the whole time it was with a struct's string and a buffer overflow... I can't believe I made that mistake either, but thanks for the help, I'll use that when I need to. But, I couldn't find out how to display members of a struct. Oh well- -LC __________________ Asking the right question is sometimes more important than knowing the answer. Please read the FAQ C Reference Card (A MUST!) Pointers and Memory The Essentials CString lib Last edited by Lynux-Penguin; 07-20-2003 at 06:49 PM.
Lynux-Penguin is offline

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