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I'm trying to debug a program that has no source code available, and I need to look at what it has stored in a std::string. I've been Googling and looking on here, and I've found some information about outputting STL containers, but all of it refers to variables, with no source or debug information all I have is a memory offset of the class data. Is there any way to do this?
440
The ptype [ARG] command will print the type.
The usual way to examine data in your program is with the print command (abbreviated p ), or its synonym inspect . It evaluates and prints the value of an expression of the language your program is written in (see section Using GDB with Different Languages).
Every std::string implementation has a pointer to the raw characters in it somewhere. For g++ 4.x, that pointer is at offset 0 into the string.
If you know that the string resides at e.g. 0x7fffffffda88, then
print *(char**)0x7fffffffda88
is what you need.
197
Perhaps the easiest option is to use the c_str method, as in:
print myStr.c_str()
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