Manage message updates

Edit messages and receive events whenever someone edits them.

Usage in Blueprints and C++

Requires Message Persistence

To manage messages in PubNub storage, you must enable Message Persistence for your app's keyset in the Admin Portal.

Edit messages

Change the content of the existing message to a new one using the EditText() method.

Method signature

Blueprint

C++ / Input parameters

Message->EditText(FString NewText);

Parameter	Type	Required	Default	Description
newText	string	Yes	n/a	New/updated text that you want to add in place of the existing message.

Output

This method doesn't return anything.

Basic usage

Correct the number of the support ticket you sent to 78398.

#include "Kismet/GameplayStatics.h"
#include "PubnubChatSubsystem.h"

UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(this);
UPubnubChatSubsystem* PubnubChatSubsystem = GameInstance->GetSubsystem<UPubnubChatSubsystem>();

UPubnubChat* Chat = PubnubChatSubsystem ->InitChat("demo", "demo", "my_user");

UPubnubChannel* Channel = Chat->GetChannel("support");

FString Timetoken = "16200000000000001";

// Fetch the message
UPubnubMessage* Message = Channel->GetMessage(Timetoken);

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Get message updates

You can receive updates when specific messages and related message reactions are added, edited, or removed on other clients using the following methods:

• StreamUpdates() checks message and message reaction-related updates on a single Message object.
• StreamUpdatesOn() checks message and message reaction-related updates on a list of Message objects.

Both methods accept a callback function as an argument. The Unreal Chat SDK invokes this callback whenever someone adds, edits or deletes a message, or adds or removes a message reaction to/from the specific message(s).

Underneath, these methods subscribe the current user to a channel and add a message reactions event listener to receive all messageAction events of type added or removed. These methods also return the unsubscribe function you can invoke to stop receiving messageAction events and unsubscribe from the channel.

Method signature

Blueprint

C++ / Input parameters

• StreamUpdates()

  Message->StreamUpdates(FOnPubnubMessageStreamUpdateReceived MessageUpdateCallback);

• StreamUpdatesOn()

  Message->StreamUpdatesOn(
      TArray<UPubnubMessage*> Messages, 
      FOnPubnubMessageStreamUpdateReceived MessageUpdateCallback
  );

Parameter	Type	Required in StreamUpdates()	Required in StreamUpdatesOn()	Default	Description
Messages	TArray<UPubnubMessage*>	No	Yes	n/a	Array of Message objects for which you want to get updates.
MessageUpdateCallback	FOnPubnubMessageStreamUpdateReceived	Yes	Yes	n/a	Callback function passed as a parameter to both methods. It defines the custom behavior to be executed when detecting channel metadata changes.

Handle the response

Output

Type	Description
UPubnubCallbackStop*	Object on which you can call Stop() to stop receiving updates.

Basic usage

• StreamUpdates()

  Get message and message reaction-related updates for the message with the timetoken 16200000000000000 published on the support channel.

  #include "Kismet/GameplayStatics.h"
  #include "PubnubChatSubsystem.h"
  
  UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(this);
  UPubnubChatSubsystem* PubnubChatSubsystem = GameInstance->GetSubsystem<UPubnubChatSubsystem>();
  
  UPubnubChat* Chat = PubnubChatSubsystem ->InitChat("demo", "demo", "my_user");
  
  UPubnubChannel* Channel = Chat->GetChannel("support");
  
  FString Timetoken = "16200000000000000";
  
  // Fetch the message
  UPubnubMessage* Message = Channel->GetMessage(Timetoken);
  

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• StreamUpdatesOn()

  Get message and message reaction-related updates for several messages published on the support channel.

  #include "Kismet/GameplayStatics.h"
  #include "PubnubChatSubsystem.h"
  
  UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(this);
  UPubnubChatSubsystem* PubnubChatSubsystem = GameInstance->GetSubsystem<UPubnubChatSubsystem>();
  
  UPubnubChat* Chat = PubnubChatSubsystem ->InitChat("demo", "demo", "my_user");
  
  UPubnubChannel* Channel = Chat->GetChannel("support");
   // Get the channels and save the reference
  UPubnubMessage* Message1 = Channel->GetMessage("16200000000000000");
  UPubnubMessage* Message2 = Channel->GetMessage("16200000000000001");
  
  TArray<UPubnubMessage*> Messages;
  Messages.Add(Message1);

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Other examples

• StreamUpdates()

  Stop listening to updates for the message with the timetoken 16200000000000000 published on the support channel.

  auto StopUpdates = Message->StreamUpdates(StreamUpdatesResponse);
  
  StopUpdates->Stop();

• StreamUpdatesOn()

  Stop listening to updates for the last ten messages published on the support channel.

  auto StopUpdates = Message->StreamUpdatesOn(Messages, MessagesStreamUpdatesResponse);
  
  StopUpdates->Stop();