App Closer - Application Manager

A modern, user-friendly desktop application built with PyQt5 that helps you manage and close running applications on Windows systems. Features a dark theme with VS Code-inspired styling and safe process management.

Features

🚀 Core Functionality

• Smart Process Detection: Automatically identifies user applications while excluding critical system processes
• Safe Application Closing: Terminates applications with proper process handling
• Memory Usage Display: Shows memory consumption for each running application
• Multi-Selection Support: Select and close multiple applications at once
• Bulk Operations: Close all non-essential applications with one click

🎨 User Interface

• Modern Dark Theme: VS Code-inspired color scheme

• Responsive Design: Clean and intuitive layout

• Real-time Updates: Live application list with current memory usage

• Progress Indicators: Visual feedback for long operations

• Professional Styling: Custom scrollbars, buttons, and animations

  

🔧 Technical Features

• Automatic PyCache Cleanup: Cleans Python cache directories on application close
• Safe Process Filtering: Protects critical system processes from accidental closure
• Error Handling: Robust error management with user-friendly messages
• Performance Optimized: Efficient process enumeration and memory management

Installation

Prerequisites

• Python 3.6 or higher
• Windows Operating System (tested on Windows 10/11)

Required Packages

Install the required dependencies using pip:

pip install pyqt5 psutil pywin32

Manual Installation

1. Clone or download the project files:

   • main.py - Main application logic
   • style.py - Application styling and themes

2. Ensure all dependencies are installed:

   pip install pyqt5 psutil pywin32

3. Run the application:

   python main.py

Usage

Starting the Application

python main.py

The application will automatically scan for running user applications and display them in a sorted list by memory usage.

Basic Operations

1. Refresh List: Click the "Refresh" button to update the application list
2. Select Applications: Click on individual applications or use Ctrl+Click for multiple selection
3. Close Selected: Click "Close Selected" to terminate chosen applications
4. Close All: Click "Close All" to close all non-system applications

Safety Features

• Protected System Processes: Critical Windows processes are automatically excluded
• Confirmation Dialogs: All close operations require user confirmation
• Memory Protection: System processes and services are never shown or closed

Protected System Processes

The application automatically protects these critical system processes:

• explorer.exe - Windows Explorer
• csrss.exe - Client Server Runtime Process
• winlogon.exe - Windows Logon Application
• services.exe - Service Control Manager
• lsass.exe - Local Security Authority Process
• svchost.exe - Service Host Process
• system - System Process
• system idle process - System Idle Process
• wininit.exe - Windows Initialization Process
• dwm.exe - Desktop Window Manager
• taskhostw.exe - Host Process for Windows Tasks
• ctfmon.exe - Alternative Input Services

Technical Details

Architecture

• Frontend: PyQt5 with custom QSS styling
• Process Management: psutil for process enumeration and management
• Windows Integration: pywin32 for window management and process details
• Memory Management: Efficient garbage collection and resource cleanup

Process Detection Logic

1. Enumeration: Iterates through all running processes
2. System Filtering: Excludes processes from Windows system directories
3. GUI Detection: Filters processes without visible windows
4. User Filtering: Excludes system user processes (SYSTEM, LOCAL SERVICE, etc.)
5. Memory Calculation: Calculates and displays memory usage in MB

Safety Mechanisms

• Multiple validation layers for process identification
• Graceful termination attempts before force killing
• Comprehensive error handling and user feedback
• Protected process whitelist

PyCache Cleanup

The application includes an automatic cleanup feature that:

• Removes all __pycache__ directories in the project folder
• Deletes individual .pyc cache files
• Runs automatically when the application closes
• Provides console feedback about cleanup operations

Troubleshooting

Common Issues

1. "Access Denied" errors

   • Run the application as Administrator
   • Some system processes require elevated privileges

2. Missing applications in list

   • Applications without visible windows are filtered out
   • System processes are intentionally excluded for safety

3. Application fails to close

   • Some applications may resist termination
   • The app attempts both graceful and forced termination
   • Administrative privileges may be required for some apps

Performance Tips

• The initial scan may take a few seconds on systems with many processes
• Use the refresh button sparingly to avoid unnecessary system scans
• Closing many applications simultaneously may temporarily impact system performance

Development

File Structure

app-closer/
├── main.py          # Main application logic
├── style.py         # UI styles and themes
└── README.md        # This file

Code Style

• PEP 8 compliance
• Type hints where applicable
• Comprehensive error handling
• Modular design for easy maintenance

Building from Source

No special build process required. The application runs directly from Python source.

License

This project is provided for educational and personal use. Please ensure you have the right to manage processes on systems where this application is deployed.

Contributing

Contributions are welcome! Please feel free to submit pull requests or open issues for bugs and feature requests.

Security Notes

• This application terminates processes - use with caution
• Always save your work before closing applications
• The application is designed to be safe but cannot prevent data loss in unsaved applications
• Run with appropriate permissions for your use case

Support

For issues and questions:

1. Check the troubleshooting section above
2. Ensure all dependencies are properly installed
3. Verify Python version compatibility
4. Check Windows system requirements

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Note: This tool is designed for technical users who understand the implications of process termination. Use responsibly and always ensure important work is saved before closing applications.