call other class function using object in Run() method of Thread class

[santosh.kumar]

hi

///first file

#include "Guiclass.h"
////
void threadclass::run()
{
Guiclass *obj = NULL;
obj = new GuiClass;
while(!bFalse)
{
obj->func();
}
}

////Gui class
void Guiclass::func()
{
///
}


But it is not working...program becomes crashed...why