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Official channel

Overview
An official channel can send broadcast messages to subscribed users and also engage in one-on-one chats with them.
When messages are exchanged, a one-on-one conversation is generated, with the conversationID structured as c2c_officialAccountID.
For management features such as creating an official channel, refer to the server APIs. The IMSDK primarily provides functionalities such as subscribing to an official channel, unsubscribing from an official channel, and retrieving the list of official channels.
Note：
This feature is supported only by the Enhanced edition on v7.6.5011 or later.
Official channel Profile Class Introduction
Attribute
Definition
Description
officialAccountID
official channel ID
The ​official channel ID must be prefixed with @TOA#_, can be customized, and has a maximum length of ​48 bytes.
officialAccountName
official channel name
Maximum Length: 150 bytes (UTF-8 encoded, where 1 Chinese character occupies 3 bytes)
faceUrl
Profile photo of the official channel
Maximum Length: 500 bytes
organization
organization name
Maximum Length: 500 bytes (UTF-8 encoded, where 1 Chinese character occupies 3 bytes)
introduction
Introduction of the official channel
Maximum Length: 400 bytes (UTF-8 encoded, where 1 Chinese character occupies 3 bytes)
customData
custom data
Maximum Length: 3000 bytes
createTime
Creation time of the official channel
Unit: Seconds
subscriberCount
The number of subscribed users
The number of active subscribers to the official channel
subscribeTime
The time when the logged-in user subscribed
Unit: Seconds
Subscribe to an Official channel
To subscribe to an official channel, call the subscribeOfficialAccount method (Java / Swift / Objective-C / C++) and pass the officialAccountID as the parameter.
1. Upon successful subscription, subscribers will receive the onOfficialAccountSubscribed callback notification  (Java / Swift / Objective-C / C++) .
2. When the subscribed official channel's profile is modified via server API, subscribers will receive the onOfficialAccountInfoChanged callback notification (Java / Swift / Objective-C / C++) .
3. When the subscribed official channel is deleted via server API, subscribers will receive the onOfficialAccountDeleted callback notification (Java / Swift / Objective-C / C++).
Sample code:
Java
Swift
Objective-C
C++
V2TIMManager.getFriendshipManager().subscribeOfficialAccount("official_test", new V2TIMCallback() {
    @Override
    public void onSuccess() {
        
    }
﻿
    @Override
    public void onError(int code, String desc) {
        
    }
});
﻿
V2TIMManager.getFriendshipManager().addFriendListener(new V2TIMFriendshipListener() {
    @Override
    public void onOfficialAccountSubscribed(V2TIMOfficialAccountInfo officialAccountInfo) {
        
    }
﻿
    @Override
    public void onOfficialAccountDeleted(String officialAccountID) {
        
    }
﻿
    @Override
    public void onOfficialAccountInfoChanged(V2TIMOfficialAccountInfo officialAccountInfo) {
        
    }
});
V2TIMManager.shared.subscribeOfficialAccount(officialAccountID: "officialAccountID") {
    print("subscribeOfficialAccount succ")
} fail: { code, desc in
    print("subscribeOfficialAccount fail, \(code), \(desc)")
}
V2TIMManager.shared.addFriendListener(listener: self)
﻿
func onOfficialAccountSubscribed(officialAccountInfo: V2TIMOfficialAccountInfo) {
    print("officialAccountInfo:\(officialAccountInfo.description)");
}
﻿
func onOfficialAccountDeleted(officialAccountID: String) {
    print("officialAccountID:\(officialAccountID)");
}
﻿
func onOfficialAccountInfoChanged(officialAccountInfo: V2TIMOfficialAccountInfo) {
    print("officialAccountInfo:\(officialAccountInfo.description)");
}
[[V2TIMManager sharedInstance] subscribeOfficialAccount:@"official_test" succ:^ {
    NSLog(@"success");
} fail:^(int code, NSString *desc) {
    NSLog(@"fail, code: %d, msg: %@", code, msg);
}];
﻿
[[V2TIMManager sharedInstance] addFriendListener:self];
﻿
- (void)onOfficialAccountSubscribed:(V2TIMOfficialAccountInfo *)officialAccountInfo {
    
}
﻿
- (void)onOfficialAccountDeleted:(NSString *)officialAccountID {
    
}
﻿
- (void)onOfficialAccountInfoChanged:(V2TIMOfficialAccountInfo *)officialAccountInfo {
    
}
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&)>;
    
    ValueCallback() = default;
    ~ValueCallback() override = default;
    
    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
      success_callback_ = std::move(success_callback);
      error_callback_ = std::move(error_callback);
    }
    
    void OnSuccess(const T& value) override {
      if (success_callback_) {
        success_callback_(value);
      }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
      if (error_callback_) {
        error_callback_(error_code, error_message);
      }
    }
﻿
private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};
﻿
auto callback = new Callback;
callback->SetCallback(
    [=]() {
      delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
      delete callback;
    });
V2TIMManager::GetInstance()->GetFriendshipManager()->SubscribeOfficialAccount(
    "official_test", callback);
﻿
class FriendshipListener final : public V2TIMFriendshipListener {
public:
    FriendshipListener() = default;
    ~FriendshipListener() override = default;
    
    void OnOfficialAccountSubscribed(const V2TIMOfficialAccountInfo &info) override {
        
    }
    
    void OnOfficialAccountDeleted(const V2TIMString &officialAccountID) override {
        
    }
    
    void OnOfficialAccountInfoChanged(const V2TIMOfficialAccountInfo &info) override {
        
    }
};
﻿
FriendshipListener friendshipListener;
V2TIMManager::GetInstance()->AddFriendshipListener(&friendshipListener);
Unsubscribe from an Official channel
To unsubscribe from an official channel, call the unsubscribeOfficialAccount method  (Java / Swift / Objective-C / C++) and pass the officialAccountID as the parameter.
After successful unsubscription, the user will receive an onOfficialAccountUnsubscribed callback notification(Java / Swift / Objective-C / C++).
Sample code:
Java
Swift
Objective-C
C++
V2TIMManager.getFriendshipManager().unsubscribeOfficialAccount("official_test", new V2TIMCallback() {
    @Override
    public void onSuccess() { 
        
    } 
 
    @Override
    public void onError(int code, String desc) {
        
    } 
});
﻿
V2TIMManager.getFriendshipManager().addFriendListener(new V2TIMFriendshipListener() {
    @Override
    public void onOfficialAccountUnsubscribed(String officialAccountID) {
        
    }
});
V2TIMManager.shared.unsubscribeOfficialAccount(officialAccountID: "officialAccountID") {
    print("unsubscribeOfficialAccount succ")
} fail: { code, desc in
    print("unsubscribeOfficialAccount fail, \(code), \(desc)")
}
﻿
V2TIMManager.shared.addFriendListener(listener: self)
﻿
func onOfficialAccountUnsubscribed(officialAccountID: String) {
    print("officialAccountID:\(officialAccountID)");
}
[[V2TIMManager sharedInstance] unsubscribeOfficialAccount:@"official_test" succ:^ {
    NSLog(@"success");
} fail:^(int code, NSString *desc) {
    NSLog(@"fail, code: %d, msg: %@", code, msg);
}];
﻿
[[V2TIMManager sharedInstance] addFriendListener:self];
﻿
- (void)onOfficialAccountUnsubscribed:(V2TIMOfficialAccountInfo *)officialAccountInfo {
    
}
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&)>;
    
    ValueCallback() = default;
    ~ValueCallback() override = default;
    
    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
      success_callback_ = std::move(success_callback);
      error_callback_ = std::move(error_callback);
    }
    
    void OnSuccess(const T& value) override {
      if (success_callback_) {
        success_callback_(value);
      }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
      if (error_callback_) {
        error_callback_(error_code, error_message);
      }
    }
﻿
private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};
﻿
auto callback = new Callback;
callback->SetCallback(
    [=]() {
      delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
      delete callback;
    });
    
V2TIMManager::GetInstance()->GetFriendshipManager()->UnsubscribeOfficialAccount(
    "official_test", callback);
﻿
class FriendshipListener final : public V2TIMFriendshipListener {
public:
    FriendshipListener() = default;
    ~FriendshipListener() override = default;
﻿
    void OnOfficialAccountUnsubscribed(const V2TIMString &officialAccountID) override {
        
    }
};
﻿
FriendshipListener friendshipListener;
V2TIMManager::GetInstance()->AddFriendshipListener(&friendshipListener);        
Get Official channel List
Call the getOfficialAccountsInfo interface (Java / Swift / Objective-C / C++)  to retrieve the official channel list.
When the officialAccountIDList is empty, it returns the list of subscribed official channels.
When specific official channel IDs are provided in officialAccountIDList, it returns information for those specified official channels.
Sample code:
Java
Swift
Objective-C
C++
List<String> officialAccountIDList = new ArrayList<>();
V2TIMManager.getFriendshipManager().getOfficialAccountsInfo(officialAccountIDList, new V2TIMValueCallback<List<V2TIMOfficialAccountInfoResult>>() {
    @Override
    public void onSuccess(List<V2TIMOfficialAccountInfoResult> v2TIMOfficialAccountInfoResults) {
        
    }
﻿
    @Override
    public void onError(int code, String desc) {
        
    }
});
V2TIMManager.shared.getOfficialAccountsInfo(officialAccountIDList: ["officialAccountID"]) { officialAccountResultList in
    officialAccountResultList.forEach { item in
        print(item.description)
    }
    
} fail: { code, desc in
    print("getOfficialAccountsInfo fail, \(code), \(desc)")
}
[[V2TIMManager sharedInstance] getOfficialAccountsInfo:nil succ:^(NSArray<V2TIMOfficialAccountInfoResult *> *resultList) {
    [self appendString:[NSString stringWithFormat:@"success：%@", resultList]];
} fail:^(int code, NSString *desc) {
    [self appendString:[NSString stringWithFormat:@"fail，code：%d msg：%@",code,desc]];
}];
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&)>;
    
    ValueCallback() = default;
    ~ValueCallback() override = default;
    
    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
      success_callback_ = std::move(success_callback);
      error_callback_ = std::move(error_callback);
    }
    
    void OnSuccess(const T& value) override {
      if (success_callback_) {
        success_callback_(value);
      }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
      if (error_callback_) {
        error_callback_(error_code, error_message);
      }
    }
﻿
private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};
﻿
V2TIMStringVector officialAccountIDList;
﻿
auto callback = new ValueCallback<V2TIMTopicInfoResultVector>{};
callback->SetCallback(
    [=](const V2TIMOfficialAccountInfoResultVector& officialAccountInfoResultList) {
      delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
      delete callback;
    });
﻿
V2TIMManager::GetInstance()->GetFriendshipManager()->GetOfficialAccountsInfo(
    officialAccountIDList, callback);
Official channel Messaging
official channels support two types of messages:
1. ​Broadcast messages - Sent to all subscribers.
2. ​One-to-one messages - Private conversations between the official channel and individual subscribers.
Send Broadcast Messages
Use the ​server-side broadcast message API to send messages to all subscribers of an official channel.
Exchange One-to-One Messages
Subscriber → Official channel:
Use the IMSDK's sendMessage (Java / Swift / Objective-C /C++) with the official official channel's officialAccountID as the receiver.
Official channel → Subscriber:
Use the ​server-side one-to-one message API, specifying:
From_Account: Official channel's officialAccountID
To_Account: Subscriber's userID
Receive Messages
Both message types can be received via the IMSDK's ​message listener.
﻿
Attribute	Definition	Description
officialAccountID	official channel ID	The official channel ID must be prefixed with @TOA#_, can be customized, and has a maximum length of 48 bytes.
officialAccountName	official channel name	Maximum Length: 150 bytes (UTF-8 encoded, where 1 Chinese character occupies 3 bytes)
faceUrl	Profile photo of the official channel	Maximum Length: 500 bytes
organization	organization name	Maximum Length: 500 bytes (UTF-8 encoded, where 1 Chinese character occupies 3 bytes)
introduction	Introduction of the official channel	Maximum Length: 400 bytes (UTF-8 encoded, where 1 Chinese character occupies 3 bytes)
customData	custom data	Maximum Length: 3000 bytes
createTime	Creation time of the official channel	Unit: Seconds
subscriberCount	The number of subscribed users	The number of active subscribers to the official channel
subscribeTime	The time when the logged-in user subscribed	Unit: Seconds