preface
Develop a support for national IM chat, can have basic functions, send text, pictures, files and so on related content.
Tencent IM Products
An overview of the
Tencent Instant Messaging IM is an instant messaging program launched by Tencent. The current time is March 2020 (Tencent IM’s promotional activities and sales plan will change from time to time). The IM provides an all-end access interface, a stable and accessible instant messaging cloud service with global coverage.
Application scenarios
Including but not limited to the following scenarios:
The characteristics of
Message transmission
Supports text, picture, short voice, short video and other rich media messages, as well as customized messages and customized expressions. Supports the preservation of historical roaming messages, integrates message recall, message forwarding, and security attack capabilities, and builds a stable and convenient message transmission channel.
Session management
Integrated TUIKit components, easy to add session, session top, session list display, unread message count, historical roaming message display and other functions.
Group management
Support group member management, group custom fields, group information and group announcement change and display, group top, provide private group, public group, chat room, audio and video chat room and other groups to meet the needs of personalized groups.
Data management
You can set user information, change profile picture, configure friend relationship, and provide friend authentication options, which are suitable for your business scenarios.
Flagship edition and professional edition function comparison
IM packages are classified into Experience edition, Professional edition, and flagship edition. After an application is created, the default IM package is Experience edition (free). You can select different IM packages based on your service requirements.
The architecture
IM provides global access, single chat, group chat, message push, data relationship chain hosting, account authentication and other comprehensive solutions, and provides a complete App access, background management interface.
cost
After September 14, 2018, all customers who register with sdkappID will need to purchase 999, which is not used before, which means that you want to make your own Demo and issue 999 first, as shown below:
Use Tencent IM to prepare
Product synopsis: cloud.tencent.com/document/pr… Price: cloud.tencent.com/document/pr… Application scenarios: cloud.tencent.com/document/pr… The Demo experience: cloud.tencent.com/document/pr… Access SDK:cloud.tencent.com/document/pr…
Tencent IM service SDKAppID and secret key
Tencent Development Documents
Cloud.tencent.com/document/pr… Download the SDK
Basic concepts of IM SDK
The session
There are two types of conversations:
- One is A C2C session, which is a conversation established between the user and the peer in a single chat. Messages are read and sent through the session.
- One is a group session, which is a session composed of members in a group. All members in the group can receive the message sent in the group session. As shown in the figure below, a session represents a conversation with a friend.
The message
In IM SDK, Message refers to the content to be sent to the other party. The Message includes several attributes, such as whether it has been read, whether it has been successfully sent, the sender account, and the time when the Message is generated. A message consists of multiple ELEMs. Each Elem can be a text, picture, or expression. Multiple ELEMs can be used to send a message.
The group ID
Group ID Uniquely identifies a group. It is generated by the background and returned when a group is created.
IM SDK usage instructions
IM SDK interface
Address: document cloud.tencent.com/document/pr… If the parameter string of the interface contains Chinese characters, use UTF-8 encoding.
Event callback interface
The IM SDK initializes related interfaces
Login and logout related interfaces
Session-specific interface
Message dependent interface
Group related Interfaces
User profile related interface
Relationship chain related interfaces
modular
Key code of Demo
tencentIMManager.pri
# ImSDK
INCLUDEPATH += $$PWD/ImSDK/includes
HEADERS += \
$$PWD/ImSDK/includes/TIMCloud.h \
$$PWD/ImSDK/includes/TIMCloudCallback.h \
$$PWD/ImSDK/includes/TIMCloudComm.h \
$$PWD/ImSDK/includes/TIMCloudDef.h
LIBS += -L$$PWD/ImSDK/lib/Win32/Release \
-limsdk
Copy the code
Project template V1.0.0
V1.0.0 for the module
Into the pit
Pit 1: Login authentication problem
The problem
Logon, callback error 70003
why
Each time you log in to the system, you need to enter the userId and UserSig. The UserSig is generated based on the userId. The two authentications are considered to be unique and reliable.
The solution
Local generation of userSig, do large chat to prevent cracking to improve security, can let the background to Tencent generation of userSig, to ensure reliability. 
Pit 2: missing library “bcrypt” during compilation authentication
The problem
To solve
The library “zlib” is missing during compilation authentication.
The problem
why
Lack of zlib library, need to compile yourself
To solve
Please refer to the blog: zlib development Notes (a) : Zlib library introduction, compilation and engineering template “add header file path and library
Pit four: Error 70003 is reported when landing
The problem
why
Chinese userId.
To solve
Only English numeric IDS can be used.
Pit five: Error 70003 when landing
The problem
why
To solve
Using STD: : string
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