🖥️ Delphi_Delta_ScreenShot

Advanced Desktop Screenshot Capture, Analysis & Network Transmission System

High-performance screenshot monitoring with real-time pixel difference detection and network streaming capabilities

🚀 Overview

The Delphi_Delta_ScreenShot Suite is a comprehensive desktop monitoring solution built in Delphi, featuring three powerful applications that work together to provide advanced screenshot analysis, comparison, and network transmission capabilities. Perfect for remote monitoring, screen sharing, change detection, and educational demonstrations.

🎯 What's Included

📡 Server Application - Centralized screenshot receiver with real-time display
📱 Client Application - Intelligent screenshot sender with delta compression
🔍 Standalone Comparator - Local screenshot difference analyzer

🏗️ Architecture

graph TD
    A[Desktop Screen] --> B[Client Captures Screenshot]
    B --> C{Delta Mode?}
    C -->|Yes| D[Compare with Previous]
    C -->|No| E[Send Full Screenshot]
    D --> F[Generate Pixel Changes Only]
    F --> G[Transmit via NetCom7 Sockets]
    E --> G
    G --> H[Server Receives Data]
    H --> I[Process & Display]
    I --> J[Live Monitor Display]

⭐ Key Features

🖥️ Server (Receiver)

Real-time Display - Live screenshot viewing from multiple clients
Delta Processing - Efficient pixel-change reconstruction
Multi-client Support - Handle connections from multiple sources simultaneously using NetCom7
Performance Optimized - ScanLine-based bitmap processing for maximum speed
Network Statistics - Track bandwidth usage, client connections, and data flow
Request/Response - Server can request screenshots from clients on-demand

📱 Client (Sender)

Intelligent Capture - Full desktop screenshot acquisition
Delta Compression - Send only changed pixels (up to 95% bandwidth reduction)
Auto-capture Mode - Configurable interval-based automatic transmission
Network Resilience - Automatic reconnection and error handling
Flexible Modes - Switch between full screenshots and delta updates
Performance Metrics - Real-time transmission statistics and timing

🔍 Standalone Comparator

Visual Diff Display - Highlight exactly what changed between screenshots
Pixel-Perfect Analysis - Detect even single-pixel modifications
Size Calculation - Precise measurement of actual changes (bytes)
High Performance - Optimized scanline processing for large images
Memory Efficient - Smart bitmap management for minimal resource usage

🛠️ Technical Specifications

Performance Optimizations

24-bit Pixel Format - Consistent memory layout for fastest access
ScanLine Processing - Direct memory manipulation (100x+ faster than Canvas.Pixels)
Delta Compression Algorithm - Transmit only changed pixels with coordinate mapping
Memory Streaming - Efficient bitmap serialization and network transmission
Multi-threaded Architecture - Non-blocking UI during intensive operations

Network Protocol (NetCom7)

// Command Structure used with NetCom7
CMD_REQUEST_SCREENSHOT     = 1  // Server requests client screenshot
CMD_SEND_SCREENSHOT        = 2  // Client sends full screenshot data
CMD_SEND_DELTA_SCREENSHOT  = 3  // Client sends pixel changes only

// Delta Data Format
TDeltaHeader = packed record
  Width, Height: Word;      // Image dimensions
  ChangeCount: Cardinal;    // Number of pixel changes
end;

TPixelChange = packed record
  X, Y: Word;              // Pixel coordinates
  Color: TColor;           // New pixel color value
end;

📦 Installation

Prerequisites

Delphi XE2 or later
Windows 7+
NetCom7 components - Available on GitHub

Quick Setup

Clone Repository

git clone https://github.com/BitmasterXor/Delphi_Delta_ScreenShot.git
cd Delphi_Delta_ScreenShot

Install NetCom7
- Download NetCom7 from https://github.com/spawn451/NetCom7
- Install package in Delphi IDE
- Ensure components are available in Tool Palette

Build Applications

Server: Open Server\ScreenshotServer.dpr → Build
Client: Open Client\ScreenshotClient.dpr → Build  
Comparator: Open Comparator\ScreenshotComparator.dpr → Build

Deploy & Run
- Run Server first, click "Start Server"
- Run Client(s), enter server IP, click "Connect"
- Use Comparator standalone for local analysis

🚀 Usage Examples

Basic Remote Monitoring

// Server Side - Start listening for connections
procedure StartMonitoring;
begin
  ncServerSource1.Port := 8080;
  ncServerSource1.Active := True;
  // Server now receives and displays screenshots automatically
end;

Automated Screenshot Streaming

// Client Side - Auto-capture every 500ms with delta compression
procedure EnableAutoCapture;
begin
  chkAutoDelta.Checked := True;      // Enable delta mode
  chkAutoCapture.Checked := True;    // Enable auto-capture
  spnInterval.Value := 500;          // 500ms intervals
  // Client now streams changes automatically
end;

Local Screenshot Analysis

// Comparator - Detect changes between two captures
function AnalyzeChanges: string;
var
  ChangesBitmap: TBitmap;
begin
  TakeScreenshot(FCurrentBitmap);
  ChangesBitmap := CompareImages(FLastBitmap, FCurrentBitmap);
  Result := Format('Changes: %.2f KB', [FChangesSize / 1024]);
end;

📈 Performance Benchmarks (Estimation)

Performance differs with screen sizes, hardware specifications, and network conditions

Operation	Time (avg)	Memory Usage	Notes
Full Screenshot (1920x1080)	~50ms	6.2MB	BitBlt + Stream serialization
Delta Generation	~25ms	2.1MB	ScanLine pixel comparison
Network Transmission	~15ms	1.2MB	Compressed delta data
Server Display Update	~10ms	0.8MB	Direct bitmap assignment

Tested on: AMD Ryzen 7 5800H, 32GB RAM, 1Gbps network

🎛️ Configuration Options

Server Settings

Port Configuration - Default 8080, customizable
Encryption Key - Secure client-server communication
Client Limits - Maximum concurrent connections
Display Options - Scaling, refresh rates, statistics

Client Settings

Server Connection - IP address and port configuration
Capture Modes - Full screenshot vs. delta-only transmission
Auto-capture - Interval timing (50ms - 60000ms)
Quality Settings - Bitmap compression and pixel format options

Comparator Settings

Sensitivity - Pixel difference thresholds
Display Modes - Highlight changes, side-by-side, overlay
Export Options - Save difference maps and statistics

🎯 Use Cases

🏢 Enterprise & Business

Remote Support - IT technicians monitor user screens in real-time
Quality Assurance - Automated detection of UI changes during testing
Training & Education - Live demonstration of software usage
Security Monitoring - Track desktop activity and unauthorized changes

🎮 Development & Testing

Regression Testing - Automated detection of visual changes in applications
Performance Analysis - Monitor application behavior over time
Live Coding Sessions - Stream desktop to multiple viewers efficiently
Version Comparison - Visual diff between software releases

🎓 Educational

Screen Recording - Efficient capture of desktop tutorials
Student Monitoring - Teachers observe student progress remotely
Presentation Tools - Share desktop with minimal bandwidth usage
Research Applications - Analyze user interaction patterns

🔧 Advanced Features

Network Optimization

Adaptive Compression - Automatically adjust quality based on network conditions
Connection Pooling - Efficiently manage multiple client connections
Bandwidth Throttling - Limit transmission rates to prevent network congestion
Reconnection Logic - Automatic recovery from network interruptions

Image Processing

Smart Delta Detection - Ignore insignificant pixel changes (cursors, animations)
Region of Interest - Focus monitoring on specific screen areas
Color Space Optimization - Efficient pixel format conversions
Memory Pool Management - Reuse bitmap objects to minimize garbage collection

🧪 Testing & Quality Assurance

Automated Tests

Unit Tests - Core bitmap processing functions
Integration Tests - Client-server communication protocols
Performance Tests - Memory usage and processing speed benchmarks
Stress Tests - Multiple concurrent connections and high-frequency updates

Manual Testing Checklist

Server starts/stops cleanly
Multiple clients connect simultaneously
Delta compression reduces bandwidth usage
Screenshot quality remains high
Network interruptions handled gracefully
Memory usage stays within acceptable limits

🤝 Contributing

We welcome contributions! Here's how to get started:

Fork the repository
Create a feature branch (git checkout -b feature/amazing-feature)
Commit your changes (git commit -m 'Add amazing feature')
Push to branch (git push origin feature/amazing-feature)
Open a Pull Request

Development Guidelines

Follow Delphi coding conventions
Add unit tests for new functionality
Update documentation for API changes
Optimize for performance where possible
Test with multiple Delphi versions

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

👨‍💻 Author

BitmasterXor

GitHub: @BitmasterXor
Discord: BitmasterXor

🙏 Acknowledgments

NetCom7 Enthusiast Spawn77 - Excellent networking components for Delphi (GitHub)
Delphi Community - Continuous inspiration and support
Beta Testers - Valuable feedback during development
Open Source Contributors - Thanks for your improvements and bug reports

⭐ Star this repository if you find it useful!

Made with ❤️ by BitmasterXor for the Delphi Community

Name		Name	Last commit message	Last commit date
Latest commit History 15 Commits
Client (Sender)		Client (Sender)
Delphi RDP Dirty Pixels Over Network		Delphi RDP Dirty Pixels Over Network
NON Socket Demo		NON Socket Demo
Server (reciever)		Server (reciever)
.gitignore		.gitignore
ClientPreview.png		ClientPreview.png
LICENSE		LICENSE
README.md		README.md
ServerPreview.png		ServerPreview.png

License

BitmasterXor/Delphi_Delta_ScreenShot_And_RDP

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