Delphi HotPDF Component Hello World Sample

Hello World from Delphi HotPDF Component

Welcome to the comprehensive guide for the Delphi HotPDF Component HelloWorld demonstration program!

About HotPDF Component

HotPDF Component is a powerful and versatile PDF processing library designed specifically for Delphi and C++Builder developers. This comprehensive component provides an extensive API that enables developers to create, manipulate, and modify PDF documents with ease and precision.

Key Features of HotPDF Component:

  • PDF Creation & Generation: Create PDF documents from scratch with full control over layout, formatting, and content
  • Text & Graphics Support: Add text, images, shapes, and complex graphics to PDF pages
  • Multilingual Support: Full Unicode support for international text rendering
  • Font Management: Embed fonts for consistent document appearance across different systems
  • Compression Options: Multiple compression algorithms to optimize file size
  • Security Features: Document encryption, password protection, and permission controls
  • Document Manipulation: Merge, split, and modify existing PDF documents
  • Table & Form Support: Create complex tables and interactive forms

HotPDF Component Delphi Hello World Sample

HelloWorld.dpr Program Overview

The HelloWorld.dpr example program serves as an excellent introduction to the HotPDF Component’s
most basic and important feature: The TexOut function. This demonstration program
also showcases the basic PDF creation functionality.

Core Functionality:

1. PDF Document Creation

The program’s primary function is to generate PDF documents containing multilingual “Hello World” text. The CreatePDF procedure demonstrates:

  • Component Initialization: Proper setup and configuration of the THotPDF component
  • Document Properties: Setting metadata such as compression options and font embedding
  • Multilingual Text Rendering: Displaying text in 11 different languages including English, Spanish, German, French, Italian, Portuguese, Russian, Japanese, Turkish, Chinese, and Korean
  • Font Management: Using Arial Unicode MS for most languages and Malgun Gothic for Korean text
  • Compression Comparison: Creating both compressed and uncompressed versions to demonstrate file size differences

2. Window Management & System Integration

The program includes sophisticated window enumeration functionality that demonstrates:

  • System Window Enumeration: Using the Windows API EnumWindows function to iterate through all top-level windows
  • Window Title Matching: Implementing substring matching to identify target applications
  • Automated Window Closure: Sending WM_CLOSE messages to close PDF viewers that might have files open
  • Conflict Prevention: Ensuring no file access conflicts occur when creating new PDF files

3. Error Handling & Resource Management

The program demonstrates best practices for:

  • Memory Management: Proper creation and disposal of component instances
  • Exception Safety: Using try-finally blocks to ensure resource cleanup
  • User Feedback: Providing console output to inform users of program progress

Technical Implementation Details:

Compression Technology

The program creates two versions of the same PDF to demonstrate the effectiveness of FlateDecode compression:

  • Uncompressed Version: Faster creation time, larger file size
  • Compressed Version: Slightly longer creation time, significantly smaller file size

Font Handling Strategy

The program employs a sophisticated font selection strategy:

  • Arial Unicode MS: Used for most languages due to its broad character support
  • Malgun Gothic Semilight: Specifically chosen for Korean text rendering
  • Font Embedding: Ensures consistent appearance across different systems

Cross-Version Compatibility

The code includes conditional compilation directives to support both modern and legacy Delphi versions:

  • XE2+ Support: Uses namespaced units (WinApi.Windows, System.SysUtils, etc.)
  • Legacy Support: Falls back to traditional unit names for older Delphi versions
  • EurekaLog Integration: Optional memory leak detection and debugging support

Educational Value

This HelloWorld example serves multiple educational purposes:

  • Component Introduction: Provides a gentle introduction to HotPDF Component usage
  • Best Practices: Demonstrates proper resource management and error handling
  • System Integration: Shows how to integrate PDF generation with Windows system operations
  • Internationalization: Illustrates multilingual text handling in PDF documents
  • Performance Considerations: Compares different compression strategies and their trade-offs

Getting Started

To run this example program:

  1. Ensure HotPDF Component is properly installed in your Delphi IDE
  2. Open the HelloWorld.dpr project file
  3. Compile and run the program
  4. The program will automatically create two PDF files demonstrating compression differences
  5. Examine the generated files to see the multilingual text rendering and compare file sizes

Source Code

Below is the complete, well-documented source code for the HelloWorld demonstration program:

[crayon-686418b281ffc510396895/]

 

 

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