IB API - get all expirys and strikes of a stock symbol

Thanks Butterfly.

Fortunately I solved this problem.

I'm using the EWrapper from the old version.

The old definition is
void contractDetails(const ContractDetails &contractDetails);

while the new one is
void contractDetails(int reqId, const ContractDetails &contractDetails);

My codes were written in the old one. Just move them to the new function and everything works.
 
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