conv_id: Conversation ID
conv_type Conversation type,请参考TIMConvType
message_id: Message ID
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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conv_id: Conversation ID
conv_type Conversation type,请参考TIMConvType
message_id: Message ID
user_data User-defined data. The IM SDK only transfers the user data to the callback function cb without processing the data.