CODEWITHSUNDEEP
gdb
jackhab
jackhab

Reputation: 17708

Why gdb casting is not working?

I use print (CEthPacket*) 0xeb609a0 to examine an object at the given address and get A syntax error in expression, near ') 0xeb609a0'.

What am I doing wrong?

EDIT: CEthPacket is a C++ class and I'm on gdb Fedora (6.8-37.el5).

Upvotes: 53

Views: 43104

Answers (4)

Tsh
Tsh

Reputation: 841

I just ran in to similar issue, and, from a colleague of mine, I learnt that you need to provide the namespace that the class belongs to within a single quotes as following:

(gdb) p ('MyScope::MyClass'*) ptr;

Upvotes: 84

Mamue
Mamue

Reputation: 31

Also your starting namespace is the one from current stack. If you want to start from root you have to use ::NS1::NS2::Obj.

Upvotes: 3

David Shirley
David Shirley

Reputation: 19

I just ran into a very similar error. It was caused because I was trying to reference an object that is not defined in the scope of the current stack frame. Try changing to a stack frame where the CEthrPacket object is defined.

Upvotes: -1

Employed Russian
Employed Russian

Reputation: 213879

You didn't say on which platform, which version of GDB, or what CEthPacket is.

My first guess is that you should try print (struct CEthPacket *) 0xeb609a0 instead.

Upvotes: 7

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