Set the callback for the unread message count update of a conversation
callback:convTotalUnreadMessageCountChangedCallback
user_data User-defined data. The IM SDK only transfers the user data to the callback function cb without processing the data.
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Set the callback for the unread message count update of a conversation
callback:convTotalUnreadMessageCountChangedCallback
user_data User-defined data. The IM SDK only transfers the user data to the callback function cb without processing the data.