the strange phenomenon: the emiited signal cannot be received by the slot function

[zhaolewen]

according to you suggestions,I find:
1. the warnings : QObject::connect: Cannot queue arguments of type 'QList<t_orbCorr>'
2. the sender and receiver are not in the same thread

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Added after 21 minutes:

Do you get any warnings in the console during runtime? Do your sender and receiver live in the same thread?

Thank you very much ,with your suggestions,I solve the problem by registering the type 'QList<t_orbCorr>'.