pointer

[mickey]

him I've a prob.
I have;

QProgressDIalog* ppp //this in class Object
ppp = 0; //in costructor of Object
void object::setProgr(QProgressDialog* p){
    ppp=p;
}
//mainForm.cpp
QProgressDIalog* prog = new QProgressDIalog();
this->setProgr (prog);

QProgressDIalog* ppp //this in class Object
ppp = 0; //in costructor of Object
void object::setProgr(QProgressDialog* p){
    ppp=p;
}
//mainForm.cpp
QProgressDIalog* prog = new QProgressDIalog();
this->setProgr (prog);

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It compile but on give me runtime error...why?Ho can I do?
are there other way to pass pointer? it seems that ppp remain null...
thanks