Learn DELPHI-VCL with Real Code Examples
Updated Nov 27, 2025
Practical Examples
CRUD database front-end
Invoice or reporting application
Image viewer with custom controls
Multi-document interface (MDI) app
Custom component library for internal tools
Troubleshooting
Check component hierarchy
Ensure event handler is properly assigned
Verify component names and references
Debug database connectivity issues
Check form streaming and DFM file integrity
Testing Guide
Unit testing with DUnit
GUI automation testing
Database query validation
Stress testing multi-threaded components
Memory leak detection with FastMM
Deployment Options
Compiled EXE for Windows
MSI installer packages
ClickOnce or NSIS installer
Network deployment for enterprise apps
Integration with Windows services
Tools Ecosystem
Delphi IDE
VCL Component Library
Third-party component packs (TMS, DevExpress, Raize)
FireDAC for database access
RAD Studio debugging and profiling tools
Integrations
Database engines (SQLite, SQL Server, Oracle, MySQL)
COM/ActiveX integration
REST and SOAP web services
Windows API calls
Reporting tools (FastReport, Rave Reports)
Productivity Tips
Use component templates
Leverage VCL styles
Use data-aware controls for rapid database forms
Employ form inheritance
Automate repetitive tasks with scripts
Challenges
Debugging complex forms
Managing legacy code
Optimizing performance with large datasets
Custom component creation
Integrating with Windows API and services