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QVariant json_to_variant() { QJsonObject t_json; t_json["111"] = 111; t_json["222"] = 222; QJsonObject root; root["root"] = t_json; auto t_map = root.toVariantMap(); QVariant t_var = t_map; return t_var; } QVariant t_var = json_to_variant(); QJsonObject t_root = t_var....

What is the difference between the CS_SIGNAL_1 macro and the CS_SIGNAL_2 macro? When I only want to use CS_SIGNAL_1, the compiler gives an error. This question has puzzled me for three days。