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Message: [QUOTE="Paras Sharma, post: 1452205"] Hi One question regarding CPP w.r.t dynamic libary . I can understand w.r.t C where get the handle and call the function using function ptr. How to use CPP virtual funcitons when we are using dynamic library. Bacically . 1 How to organise two drived classes in dynamic library . where to place base class 2 How to create instance of derived class ,Like user if specify first library ( from cmd line a.out libd1.so ) , D1 should be instancitated and so on. Class B { .... virtual foo() =0 ; virtual foo1() {...} ; } Class D1 { .... foo() {...} ; foo1() {..} ; } Class B { .... foo() {...}; foo1(){...} ; } main () { // With Respect to C how to get CPP handle = dlopen fnctPTR = dlsym(handle..) .... } Any pointers will be helpful Thanks Paras [/QUOTE]