Broadcast real-time messages to a room

Introduction

The real-time messaging component of ZEGOCLOUD’s SDKs provides the ability to send and receive plain text messages in real time. You can use the SDK's real-time messaging APIs to send and receive the following types of messages to all or specified users in the same room.

Prerequisites

Before you begin to implement real-time messaging in your project, make sure you complete the following steps:

• A project has been created in ZEGOCLOUD Console and applied for a valid AppID and AppSign. For details, please refer to Console - How to view project information .
• ZEGO Express SDK has been integrated into the project to implement basic real-time audio and video functions. For details, please refer to Integrate the SDK and Implement a basic video call.

Send messages

• Send a Broadcast Message

  To send a Broadcast Message to all users in the same room, call the sendBroadcastMessage method. The maximum length of the message is 1024 bytes.

  Get the message delivery result through the ZegoIMSendBroadcastMessageCallback callback.

  // Send a Broadcast Message to all users in the same room. Every user in the room can receive this message through the `-onIMRecvBroadcastMessage:roomID:` callback.
  [self.engine sendBroadcastMessage:@"This is a broadcast message" roomID:@"ChatRoom-1" callback:^(int errorCode, unsigned long long messageID) {
      NSLog(@"Handle the Broadcast Message delivery result.");
  }];

• Send a Barrage Message

  To send a Broadcast Message to all users in the same room, call the sendBarrageMessage method. The maximum length of the message is 1024 bytes.

  Get the message delivery result through the ZegoIMSendBarrageMessageCallback callback.

  // Send a Barrage Message to all users in the same room. Every user in the room can receive this message through the `-onIMRecvBarrageMessage:roomID:` callback.
  [self.engine sendBarrageMessage:@"This is a barrage message" roomID:@"ChatRoom-1" callback:^(int errorCode, NSString *messageID) {
      NSLog(@"Handle the Barrage Message delivery result.");
  }];

• Send a Custom Signaling Message

  To send a Custom Signaling Message to the specified users, call the sendCustomCommand method with the message recipients passed to the toUserList parameter. The maximum length of the message is 1024 bytes.

  Get the message delivery result through the ZegoIMSendCustomCommandCallback callback.

  // Send a Custom Signaling Message to the users specified in the `toUserList` parameter. These message recipients can receive this message through the `-onIMRecvCustomCommand:fromUser:roomID:` callback.
  // If the `toUserList` parameter is set to `nil`, the SDK sends the message to all users in the room.
  NSArray<ZegoUser *> *toUserList = @[[ZegoUser userWithUserID:@"user1"], [ZegoUser userWithUserID:@"user2"]];
  [self.engine sendCustomCommand:@"This is a custom command" toUserList:toUserList roomID:@"ChatRoom-1" callback:^(int errorCode) {
      NSLog(@"Handle the Custom Signaling Message delivery result here.");
  }];

Receive messages

• Receive Broadcast Messages

Implement the onIMRecvBroadcastMessage callback method (defined in the ZegoEventHandler delegate) to receive and handle Broadcast Messages. When a user successfully sends out a Broadcast Message, other users in the same room receive the message through this callback, including the message content, message ID, time message sent, and sender information.

- (void)onIMRecvBroadcastMessage:(NSArray<ZegoBroadcastMessageInfo *> *)messageList roomID:(NSString *)roomID {
      NSLog(@"received broadcast message");
}

• Receive Barrage Messages

  Implement the onIMRecvBarrageMessage callback method (defined in the ZegoEventHandler delegate) to receive and handle Barrage Messages. When a user successfully sends out a Barrage Message, other users in the same room receive the message through this callback, including the message content, message ID, time message sent, and sender information.

  -(void)onIMRecvBarrageMessage:(NSArray<ZegoBarrageMessageInfo *> *)messageList roomID:(NSString *)roomID {
       NSLog(@"Barrage message received.");
  }

• Receive Custom Signaling Messages

  Implement the onIMRecvCustomCommand callback method (defined in the ZegoEventHandler delegate) to receive and handle Custom Signaling Messages. When a user successfully sends out a Custom Signaling Message, other users in the same room receive the message through this callback, including the message content, message ID, time message sent, and sender information.

  -(void)onIMRecvCustomCommand:(NSString *)command fromUser:(ZegoUser *)fromUser roomID:(NSString *)roomID {
      NSLog(@"Custom command received.");
  }