调用SearchMsgByPage 方法，可按照关键字和消息发送者等搜索当前用户所在服务器下的全部频道或单频道的消息，包括文本消息、图片消息、视频消息和文件消息（其他类型消息均不支持搜索）。

示例代码如下：

QChatMessageSearchPageParam param;
param.keyword = "keyword";
param.server_id = 123456;
param.channel_id = 123456;
param.from_accid = "accid";
param.from_time = 0;
param.to_time = 0;
param.msg_types = {kNIMQChatMsgTypeText};
param.sub_types = {};
param.include_self = false;
param.order = kNIMQChatSearchOrderAsc;
param.limit = 10;
param.sort = kNIMQChatMessageSearchSortCreateTime;
param.cursor = params["cursor"].asString();
param.cb = [this](const QChatMessageSearchPageResp& resp) {
    if (resp.res_code != NIMResCode::kNIMResSuccess) {
        // error handling
        return;
    }
    // process response
    // ...
};
Message::SearchMsgByPage(param);