c++ - Why does calling std::stringstream's good() through a pointer lead to crashes? -

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i having problems stringstream object. class has input stream member. checking if obj->istream , after thatn if obj->istream->good().

the stream exists call good() crashes. in visual studio 2005. clue?

how reset istream?

 if (soap->is) {     if (soap->is->good())        return soap->is->read(s, (std::streamsize)n).gcount();      return 0; }

that code gsoap framework 

 std::istringstream in_stream; in_stream.str("a buffer"); soap->is = &in_stream;

the in_stream goes out of scope, belongs local stack, ->is->good() called outside function when in_stream no longer exists.

this indicates is member not point stringstream. might initialized garbage value when enclosing object instantiated.

if testing pointer being zero, make sure it's set 0 in constructor (and reset 0 if ever detach stream).


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