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V2TIMGroupMemberSearchParam searchParam = new V2TIMGroupMemberSearchParam();
searchParam.setGroupIDList(groupIDList);
searchParam.setKeywordList(keywordList);
searchParam.setSearchMemberUserID(true);
searchParam.setSearchMemberNickName(true);
searchParam.setSearchMemberRemark(true);
searchParam.setSearchMemberNameCard(true);

V2TIMManager.getGroupManager().searchGroupMembers(searchParam, new V2TIMValueCallback<HashMap<String, List<V2TIMGroupMemberFullInfo>>>() {
  @Override
  public void onSuccess(HashMap<String, List<V2TIMGroupMemberFullInfo>> stringListHashMap) {
    StringBuilder stringBuilder = new StringBuilder();
    for (Map.Entry<String, List<V2TIMGroupMemberFullInfo>> entry : stringListHashMap.entrySet()) {
        // 群 ID
      String groupID = entry.getKey();
            // 群成员列表
      List<V2TIMGroupMemberFullInfo> memberFullInfoList = entry.getValue();
      }
    }
  }
  @Override
  public void onError(int code, String desc) {
      // 搜索群成员失败
  }
});

V2TIMGroupMemberSearchParam *searchParam = [[V2TIMGroupMemberSearchParam alloc] init];
searchParam.groupIDList = @[@"group1", @"group2"];
searchParam.keywordList = @[@"keyword1", @"keyword2"];
searchParam.isSearchMemberUserID = YES;
searchParam.isSearchMemberNickName = YES;
searchParam.isSearchMemberRemark = YES;
searchParam.isSearchMemberNameCard = YES;
[[V2TIMManager sharedInstance] searchGroupMembers:searchParam succ:^(NSDictionary<NSString *,NSArray<V2TIMGroupMemberFullInfo *> *> *memberList) {
    for (NSString *key in memberList.allKeys) {
        // 群 ID
        NSString *groupID = key;
        // 群成员列表
        NSArray *memberFullInfoList = memberList[key];
    }
} fail:^(int code, NSString *desc) {
    // 搜索群成员失败
}];

template <class T>
class ValueCallback final : public V2TIMValueCallback<T> {
public:
    using SuccessCallback = std::function<void(const T&)>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;

<span class="hljs-built_in">ValueCallback</span>() = <span class="hljs-keyword">default</span>;
~<span class="hljs-built_in">ValueCallback</span>() <span class="hljs-keyword">override</span> = <span class="hljs-keyword">default</span>;

<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">SetCallback</span><span class="hljs-params">(SuccessCallback success_callback, ErrorCallback error_callback)</span> </span>{
    success_callback_ = std::<span class="hljs-built_in">move</span>(success_callback);
    error_callback_ = std::<span class="hljs-built_in">move</span>(error_callback);
}

<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">OnSuccess</span><span class="hljs-params">(<span class="hljs-keyword">const</span> T& value)</span> <span class="hljs-keyword">override</span> </span>{
    <span class="hljs-keyword">if</span> (success_callback_) {
        <span class="hljs-built_in">success_callback_</span>(value);
    }
}
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">OnError</span><span class="hljs-params">(<span class="hljs-keyword">int</span> error_code, <span class="hljs-keyword">const</span> V2TIMString& error_message)</span> <span class="hljs-keyword">override</span> </span>{
    <span class="hljs-keyword">if</span> (error_callback_) {
        <span class="hljs-built_in">error_callback_</span>(error_code, error_message);
    }
}

private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};
V2TIMGroupMemberSearchParam param;
param.groupIDList = groupIDList;
param.keywordList = keywordList;
param.isSearchMemberUserID = true;
param.isSearchMemberNickName = true;
param.isSearchMemberRemark = true;
param.isSearchMemberNameCard = true;
auto callback = new ValueCallback<V2TIMGroupSearchGroupMembersMap>{};
callback->SetCallback(
    [=](const V2TIMGroupSearchGroupMembersMap& groupSearchGroupMembersMap) {
        V2TIMStringVector allKeys = groupSearchGroupMembersMap.AllKeys();
        for (size_t i = 0; i < allKeys.Size(); i++) {
            // 群 ID
            const V2TIMString& groupID = allKeys[i];
            // 群成员列表
            V2TIMGroupMemberFullInfoVector groupMemberFullInfoList = groupSearchGroupMembersMap.Get(groupID);
        }
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // 搜索群成员失败
        delete callback;
    });
V2TIMManager::GetInstance()->GetGroupManager()->SearchGroupMembers(param, callback);