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Overview
The method for sending a message is in the core class TencentImSDKPlugin.v2TIMManager.getMessageManager().
It supports sending text, custom, and rich media messages, and all of which belong to the V2TimMessage type.
V2TimMessage can contain different sub-types to indicate different types of messages.
Key APIs
The sendMessage (details) API is the core API for sending a message. It supports sending all types of messages.
Note: 
 The advanced message sending API mentioned below refers to sendMessage.
The API is detailed as follows:
Future<V2TimValueCallback<V2TimMessage>> sendMessage(
{
  required String id,
  required String receiver,
  required String groupID,
  int priority = 0,
  bool onlineUserOnly = false,
  bool needReadReceipt = false,
  bool isExcludedFromUnreadCount = false,
  bool isExcludedFromLastMessage = false,
  Map<String, dynamic>? offlinePushInfo,
  String? cloudCustomData,
  String? localCustomData,
}
)
Parameters:
Parameter      
Definition      
Valid for One-to-One Chat      
Valid for Group Chat   
Description   
id
ID returned after message creation
YES
YES
Create the message using the `createXxxMessage` API in advance.
receiver
`userID` of the one-to-one message receiver.
YES
NO
Just specify `receiver` for sending one-to-one chat messages.
groupID
`groupID` of the group chat
NO
YES
Just specify `groupID` for sending group messages.
priority
Message priority
NO
YES
Set a higher priority for important messages (such as those for red packets and gifts) and a lower priority for frequent and unimportant messages (such as those for likes).
onlineUserOnly
Whether only online users can receive the message.
YES
YES
If it is set to `true`, the message cannot be pulled by a receiver through historical messages. This is often used to implement weak prompts, such as "The other party is typing..." and unimportant prompts in a group.
offlinePushInfo
Offline push message
YES
YES
The title and content carried when a message is pushed offline.
needReadReceipt
Whether a read receipt is supported for the sent group message
NO
YES
Whether a read receipt is supported for the sent group message
isExcludedFromUnreadCount
Whether the sent message is counted as the unread message of the conversation
YES
YES
If it is set to `true`, the sent message is not counted as the unread message of the conversation. It defaults to `false`.
isExcludedFromLastMessage
Whether the sent message is included in the `lastMessage` of the conversation
YES
YES
If it is set to `true`, the sent message is not included in the `lastMessage` of the conversation. It defaults to `false`.
cloudCustomData
Cloud message data
YES
YES
Extra data of the message that is stored in the cloud and can be accessed by the receiver.
localCustomData
Local message data
YES
YES
Extra data of the message that is stored locally. It cannot be accessed by the receiver and will be lost after the application is uninstalled.
﻿
Note: 
If both groupID and receiver are set, targeted group messages are sent to receiver. For more information, see Targeted Group Message.
Sending Text Messages
Text messages include one-to-one messages and group messages, which are different in terms of APIs and parameters.
The ordinary and advanced APIs can be used to send text messages. The latter supports more sending parameters (such as priority and offline push message).
The ordinary API is as described below, while the advanced API is sendMessage mentioned above.
One-to-one text message
Advanced API
Take the following two steps to send a one-to-one text message with the advanced API:
1. Call createTextMessage (details) to create a text message.
2. Call sendMessage (details) to send the message.
Sample code:
    // Create a text message
    V2TimValueCallback<V2TimMsgCreateInfoResult> createTextMessageRes =
        await TencentImSDKPlugin.v2TIMManager
            .getMessageManager()
            .createTextMessage(
              text: "test", // Text message
            );
    if (createTextMessageRes.code == 0) {
      // Text message created successfully
      String? id = createTextMessageRes.data?.id;
      // Send the text message
      // During the call of `sendMessage`: If only `receiver` is entered, the message is sent to the specified recipient as a one-to-one message;
      // if only `groupID` is entered, the message is sent as a group message;
      // if `receiver` and `groupID` are entered, the message is sent to the specified member in the specified group and is displayed in the group chat and visible only to the specified recipient.
      V2TimValueCallback<V2TimMessage> sendMessageRes =
          await TencentImSDKPlugin.v2TIMManager.getMessageManager().sendMessage(
              id: id!, // ID of the created message
              receiver: "userID", // ID of the recipient
              groupID: "groupID", // ID of the receiving group
              priority: MessagePriorityEnum.V2TIM_PRIORITY_DEFAULT, // Message priority
              onlineUserOnly:
                  false, // Whether the message can be received only by online users. If this field is set to true, the message cannot be pulled in recipient historical message pulling. This field is often used to implement weak notification features such as "The other party is typing" or unimportant notifications in the group. This field is not supported by audio-video groups (AVChatRoom).
              isExcludedFromUnreadCount: false, // Whether the sent message is included in the unread message count of the conversation
              isExcludedFromLastMessage: false, // Whether the sent message is included in the `lastMessage` of the conversation
              needReadReceipt:
                  false, // Whether the message requires a read receipt (to use this feature, you need to purchase the Ultimate edition on v6.1 or later).
              offlinePushInfo: OfflinePushInfo(), // Title and content for offline push
              cloudCustomData: "", // Cloud message data. Extra data of the message that is stored in the cloud and can be accessed by the receiver.
              localCustomData:
                  "" // Local message data. Extra data of the message that is stored locally. It cannot be accessed by the receiver and will be lost after the application is uninstalled.
              );
      if (sendMessageRes.code == 0) {
        // Message sent successfully
      }
    }
Group text message
Advanced API
Take the following two steps to send a group text message with the advanced API:
1. Call createTextMessage (details) to create a text message.
2. Call sendMessage (details) to send the message.
Sample code:
    // Create a text message
    V2TimValueCallback<V2TimMsgCreateInfoResult> createTextMessageRes =
        await TencentImSDKPlugin.v2TIMManager
            .getMessageManager()
            .createTextMessage(
              text: "test", // Text message
            );
    if (createTextMessageRes.code == 0) {
      // Text message created successfully
      String? id = createTextMessageRes.data?.id;
      // Send the text message
      // During the call of `sendMessage`: If only `receiver` is entered, the message is sent to the specified recipient as a one-to-one message;
      // if only `groupID` is entered, the message is sent as a group message;
      // if `receiver` and `groupID` are entered, the message is sent to the specified member in the specified group and is displayed in the group chat and visible only to the specified recipient.
      V2TimValueCallback<V2TimMessage> sendMessageRes =
          await TencentImSDKPlugin.v2TIMManager.getMessageManager().sendMessage(
              id: id!, // ID of the created message
              receiver: "userID", // ID of the recipient
              groupID: "groupID", // ID of the receiving group
              priority: MessagePriorityEnum.V2TIM_PRIORITY_DEFAULT, // Message priority
              onlineUserOnly:
                  false, // Whether the message can be received only by online users. If this field is set to true, the message cannot be pulled in recipient historical message pulling. This field is often used to implement weak notification features such as "The other party is typing" or unimportant notifications in the group. This field is not supported by audio-video groups (AVChatRoom).
              isExcludedFromUnreadCount: false, // Whether the sent message is included in the unread message count of the conversation
              isExcludedFromLastMessage: false, // Whether the sent message is included in the `lastMessage` of the conversation
              needReadReceipt:
                  false, // Whether the message requires a read receipt (to use this feature, you need to purchase the Ultimate edition on v6.1 or later).
              offlinePushInfo: OfflinePushInfo(), // Title and content for offline push
              cloudCustomData: "", // Cloud message data. Extra data of the message that is stored in the cloud and can be accessed by the receiver.
              localCustomData:
                  "" // Local message data. Extra data of the message that is stored locally. It cannot be accessed by the receiver and will be lost after the application is uninstalled.
              );
      if (sendMessageRes.code == 0) {
        // Message sent successfully
      }
    }
Sending Custom Messages
Custom messages include one-to-one messages and group messages, which are different in terms of APIs and parameters. Custom messages can be sent with ordinary and advanced APIs.
The advanced API is sendMessage (details) mentioned above, which supports more sending parameters (such as priority and offline push message) than the ordinary API.
Custom one-to-one message
Advanced API
Take the following two steps to send a custom one-to-one message with the advanced API:
1. Call createCustomMessage (details) to create a custom message.
2. Call sendMessage (details) to send the message.
Sample code:
// Create a custom message
V2TimValueCallback<V2TimMsgCreateInfoResult> createCustomMessageRes = await TencentImSDKPlugin.v2TIMManager.getMessageManager().createCustomMessage(
    data: 'Custom data',
    desc: 'Custom desc',
    extension: 'Custom extension',
  );
  if(createCustomMessageRes.code == 0){
    String id =  createCustomMessageRes.data.id;
    // Send the custom message
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin.v2TIMManager.getMessageManager().sendMessage(id: id, receiver: "userID", groupID: "");
    if(sendMessageRes.code == 0){
      // Message sent successfully
    }
  }
Custom group message
Advanced API
Take the following two steps to send a custom group message with the advanced API:
1. Call createCustomMessage (details) to create a custom message.
2. Call sendMessage (details) to send the message.
Sample code:
// Create a custom message
V2TimValueCallback<V2TimMsgCreateInfoResult> createCustomMessageRes = await TencentImSDKPlugin.v2TIMManager.getMessageManager().createCustomMessage(
    data: 'Custom data',
    desc: 'Custom desc',
    extension: 'Custom extension',
  );
  if(createCustomMessageRes.code == 0){
    String id =  createCustomMessageRes.data.id;
    // Send the custom message
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin.v2TIMManager.getMessageManager().sendMessage(id: id, receiver: "", groupID: "groupID");
    if(sendMessageRes.code == 0){
      // Message sent successfully
    }
  }
Sending Rich Media Messages
A rich media message can be sent only with the advanced API in the following steps:
1. Call createXxxMessage to create a rich media message object of a specified type, where Xxx indicates the specific message type.
2. Call sendMessage (details) to send the message.
3. Get the callback for message sending success or failure.
Image message
To create an image message, you need to get the path of a local image first.
During message sending, the image is uploaded to the server, and the upload progress is called back. The message is sent after the image is uploaded successfully.
If your project requires web support, the image sending mode is different from that on a mobile device. For details, see the web compatibility description section.
Sample code:
V2TimValueCallback<V2TimMsgCreateInfoResult> createImageMessageRes = await TencentImSDKPlugin.v2TIMManager.getMessageManager().createImageMessage(
        imagePath: "Absolute path of the local image",
);
  if (createImageMessageRes.code == 0) {
    String id = createImageMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
Audio message
To create an audio message, you need to get the path and audio duration of a local audio file first, where the audio duration is for display on the receiver UI.
During message sending, the audio is uploaded to the server, and the upload progress is called back. The message is sent after the audio is uploaded successfully.
Sample code:
V2TimValueCallback<V2TimMsgCreateInfoResult> createSoundMessageRes =
      await TencentImSDKPlugin.v2TIMManager.getMessageManager().createSoundMessage(
        soundPath: "Absolute path of the local audio file",
        duration: 10,// Audio duration
      );
  if (createSoundMessageRes.code == 0) {
    String id = createSoundMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
Video message
To create a video message, you need to get the path, video duration, and video thumbnail of a local video file first, where the video duration and thumbnail are for display on the receiver UI.
During message sending, the video is uploaded to the server, and the upload progress is called back. The message is sent after the video is uploaded successfully.
If your project requires web support, the video sending mode is different from that on a mobile device. For details, see the web compatibility description section.
Sample code:
V2TimValueCallback<V2TimMsgCreateInfoResult> createVideoMessageRes =
      await TencentImSDKPlugin.v2TIMManager
          .getMessageManager()
          .createVideoMessage(
            videoFilePath: "Absolute path of the local video file",
            type: "mp4", // Video type
            duration: 10,// Video duration
            snapshotPath: "Absolute path of the local video thumbnail file",
          );
  if (createVideoMessageRes.code == 0) {
    String id = createVideoMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
File message
To create a file message, you need to get the path of a local file first.
During message sending, the file is uploaded to the server, and the upload progress is called back. The message is sent after the file is uploaded successfully.
If your project requires web support, the file sending mode is different from that on a mobile device. For details, see the web compatibility description section.
Sample code:
V2TimValueCallback<V2TimMsgCreateInfoResult> createFileMessageRes =
      await TencentImSDKPlugin.v2TIMManager
          .getMessageManager()
          .createFileMessage(
            filePath: "Absolute path of the local file",
            fileName: "File name",
          );
  if (createFileMessageRes.code == 0) {
    String id = createFileMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
Location message
Latitude and longitude information is sent in a location message, which requires a map control for display.
Sample code:
 V2TimValueCallback<V2TimMsgCreateInfoResult> createLocationMessage =
      await TencentImSDKPlugin.v2TIMManager
          .getMessageManager()
          .createLocationMessage(
            desc: "Shennan Boulevard, Nanshan District, Shenzhen",// Location information digest
            longitude: 34,// Longitude
            latitude: 20, // Latitude
          );
  if (createLocationMessage.code == 0) {
    String id = createLocationMessage.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
Emoji message
To send an emoji message, the corresponding emoji code is sent and then converted into the icon in the receiver.
Sample code:
V2TimValueCallback<V2TimMsgCreateInfoResult> createFaceMessageRes =
      await TencentImSDKPlugin.v2TIMManager
          .getMessageManager()
          .createFaceMessage(
            index: 0,
            data: "",
          );
  if (createFaceMessageRes.code == 0) {
    String id = createFaceMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
Support for the Flutter for Web
Chat SDK (tencent_cloud_chat_sdk) 4.1.1+2 or later version provides full compatibility with web. The steps for sending a media or file message in the web SDK are different from those of the Android SDK and iOS SDK:
Due to web characteristics, when you create a media or file message, the path cannot be directly passed in to the SDK. You need to get the DOM node for the input based on the element ID and pass in the input DOM after selecting the file.
For media selection, you are advised to use the image_picker package.
For file selection, you are advised to use the file_picker package.
If the value of getElementById in the sample code is different from the input ID that you see in the F12 console, the actual value prevails.
Sending an image
final ImagePicker _picker = ImagePicker();
﻿
_sendImageFileOnWeb() async {
  final pickedFile = await _picker.pickImage(source: ImageSource.gallery);
  final imageContent = await pickedFile!.readAsBytes();
  fileName = pickedFile.name;
  tempFile = File(pickedFile.path);
  fileContent = imageContent;
﻿
  html.Node? inputElem;
  inputElem = html.document
      .getElementById("__image_picker_web-file-input")
      ?.querySelector("input");
  final convID = widget.conversationID;
  final convType =
  widget.conversationType == 1 ? ConvType.c2c : ConvType.group;
  final createImageMessageRes = await TencentImSDKPlugin.v2TIMManager
    .getMessageManager()
    .createImageMessage(inputElement: inputElement);
  if (createImageMessageRes.code == 0) {
    String id = createImageMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
}
Sending a video
final ImagePicker _picker = ImagePicker();
﻿
_sendVideoFileOnWeb() async {
  final pickedFile = await _picker.pickVideo(source: ImageSource.gallery);
  final videoContent = await pickedFile!.readAsBytes();
  fileName = pickedFile.name ?? "";
  tempFile = File(pickedFile.path);
  fileContent = videoContent;
﻿
  if(fileName!.split(".")[fileName!.split(".").length - 1] != "mp4"){
    Toast.showToast("The video message must be in mp4 format.", context);
    return;
  }
﻿
  html.Node? inputElem;
  inputElem = html.document
      .getElementById("__image_picker_web-file-input")
      ?.querySelector("input");
  final convID = widget.conversationID;
  final convType =
  widget.conversationType == 1 ? ConvType.c2c : ConvType.group;
  final createVideoMessageRes = await TencentImSDKPlugin.v2TIMManager
    .getMessageManager()
    .createVideoMessage(inputElement: inputElement, videoFilePath: "", type: "", duration: 0, snapshotPath: "");
  if (createVideoMessageRes.code == 0) {
    String id = createVideoMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
}
Sending a file
_sendFileOnWeb(){
  final convID = widget.conversationID;
  final convType =
      widget.conversationType == 1 ? ConvType.c2c : ConvType.group;
  FilePickerResult? result = await FilePicker.platform.pickFiles();
  if (result != null && result.files.isNotEmpty) {
    html.Node? inputElem;
    inputElem = html.document
        .getElementById("__file_picker_web-file-input")
        ?.querySelector("input");
    fileName = result.files.single.name;
    final createFileMessageRes = await TencentImSDKPlugin.v2TIMManager
        .getMessageManager()
        .createFileMessage(inputElement: inputElement, filePath: "", fileName: fileName);
    if (createFileMessageRes.code == 0) {
    String id = createFileMessageRes.data.id;
    V2TimValueCallback<V2TimMessage> sendMessageRes = await TencentImSDKPlugin
        .v2TIMManager
        .getMessageManager()
        .sendMessage(id: id, receiver: "userID", groupID: "groupID");
    if (sendMessageRes.code == 0) {
      // Message sent successfully
    }
  }
  }
}
Overview
Key APIs
Sending Text Messages
- One-to-one text message
- Group text message
Sending Custom Messages
- Custom one-to-one message
- Custom group message
Sending Rich Media Messages
Support for the Flutter for Web
Parameter	Definition	Valid for One-to-One Chat	Valid for Group Chat	Description
id	ID returned after message creation	YES	YES	Create the message using the `createXxxMessage` API in advance.
receiver	`userID` of the one-to-one message receiver.	YES	NO	Just specify `receiver` for sending one-to-one chat messages.
groupID	`groupID` of the group chat	NO	YES	Just specify `groupID` for sending group messages.
priority	Message priority	NO	YES	Set a higher priority for important messages (such as those for red packets and gifts) and a lower priority for frequent and unimportant messages (such as those for likes).
onlineUserOnly	Whether only online users can receive the message.	YES	YES	If it is set to `true`, the message cannot be pulled by a receiver through historical messages. This is often used to implement weak prompts, such as "The other party is typing..." and unimportant prompts in a group.
offlinePushInfo	Offline push message	YES	YES	The title and content carried when a message is pushed offline.
needReadReceipt	Whether a read receipt is supported for the sent group message	NO	YES	Whether a read receipt is supported for the sent group message
isExcludedFromUnreadCount	Whether the sent message is counted as the unread message of the conversation	YES	YES	If it is set to `true`, the sent message is not counted as the unread message of the conversation. It defaults to `false`.
isExcludedFromLastMessage	Whether the sent message is included in the `lastMessage` of the conversation	YES	YES	If it is set to `true`, the sent message is not included in the `lastMessage` of the conversation. It defaults to `false`.
cloudCustomData	Cloud message data	YES	YES	Extra data of the message that is stored in the cloud and can be accessed by the receiver.
localCustomData	Local message data	YES	YES	Extra data of the message that is stored locally. It cannot be accessed by the receiver and will be lost after the application is uninstalled.