Error : undefined reference to `vtable for MyClass'

[joseph]

I assume that by porting, you are not just compiling it with Qt4 - and that you changed the code to Qt4.

Looking at the headers you are using, you are only using Qt3 headers, and Qt3 support headers from Qt4... this doesn't look correct.

yaa , we are in the first phase of porting.
phase 1: In this phase we will port it using the Qt3 support module
phase 2: if i successfully completed the first phase, then i will remove the Qt3 support, and will use the pure qt4 classes. ( this is asper the porting doc in assistant )