High-performance Windows C++ Chat Server using I/O Completion Ports (IOCP), fully compatible with Visual Studio 2026 and SQL Server.

This project includes:

• ✔️ Console-based Chat Server
• ✔️ Console Client
• ✔️ Automated Bot Client (BClient)
• ✔️ SQL Server integration
• ✔️ Jenkins CI build pipeline
• ✔️ Tested and runnable on Visual Studio 2026 + Windows 11/10

Cpp-IOCP-Server is a multithreaded TCP chat server implemented using Windows I/O Completion Ports (IOCP) for scalable asynchronous networking.

It is designed to handle many concurrent clients efficiently with minimal CPU overhead.

Component Description

Server Console-based asynchronous IOCP TCP server Client Simple console client for manual chat testing BClient Bot client for load testing & automation SQL Server Integration Stores users & chat logs Jenkinsfile Windows-based MSBuild pipeline

• Asynchronous TCP sockets\
• Efficient completion port threading model\
• Highly scalable for many concurrent users

Connection settings stored in:

Server/conf/SqlConnection.properties 

Database schema:

Chat/chatTable.sql 

Useful for: - Load testing - Repetitive workflow tests - Simulating large user groups

• Windows-based build pipeline using Jenkinsfile
• Compatible with MSBuild 2026 toolset

/Server — Visual Studio 2026 chat server project /Client — Console client /BClient — Bot client /Chat — Shared protocol definitions /Chat/chatTable.sql — SQL Server schema README.md — Documentation Jenkinsfile — Jenkins CI pipeline 

• Windows 10 / Windows 11
• Visual Studio 2026
  • MSVC v146 Toolset\
  • Windows SDK 10.0+
• SQL Server 2017+
• Git (optional, for Jenkins builds)

Ensure the following VS2026 workloads are installed:

• ✔ Desktop development with C++\
• ✔ Windows 10/11 SDK\
• ✔ MSVC v146 compiler

1. Create a database.
2. Run:

<!-- --> 

Chat/chatTable.sql 

3. Configure DB connection:

<!-- --> 

Server/conf/SqlConnection.properties 

Example:

DB_HOST=127.0.0.1 DB_USER=sa DB_PASSWORD=your_password DB_NAME=chatdb 

Open each .sln in Visual Studio 2026:

• Server/Server.sln
• Client/Client.sln
• BClient/BClient.sln

Build:

Configuration: Release Platform: x64 

Server.exe 

You should see:

Server ready listen port number : xxxx Server CPU num : xx 

Start one or more:

Client.exe BClient.exe 

They will connect to the server and begin communication.

The Bot Client (BClient) is capable of:

• Auto-login\
• Auto-message sending\
• Load testing with many parallel bots

This allows verifying server stability under heavy traffic.

##Jenkins CI Integration

Included Jenkinsfile supports automated builds on Windows:

• Git checkout\
• MSBuild compile\
• Artifact generation

Configure Jenkins agent with:

• Visual Studio 2026 Build Tools\
• Git\
• Windows Server 2019/2022 or Windows 11

IOCP allows:

• High concurrency with fewer threads\
• Low CPU usage\
• Efficient overlapped I/O\
• Ideal for chat servers, game servers, and streaming servers