Delphi Programming Guide
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Part I - Foundations
  Chapter 1 Delphi 7 and Its IDE
  Chapter 2 The Delphi Programming Language
  Chapter 3 The Run-Time Library
  Chapter 4 Core Library classes
  Chapter 5 Visual Controls
  Chapter 6 Building the User Interface
  Chapter 7 Working with Forms
Part II - Delphi Object-Oriented Architectures
  Chapter 8 The Architecture of Delphi Applications
  Chapter 9 Writing Delphi Components
  Chapter 10 Libraries and Packages
  Chapter 11 Modeling and OOP Programming (with ModelMaker)
  Chapter 12 From COM to COM+
Part III - Delphi Database-Oriented Architectures
  Chapter 13 Delphi's Database Architecture
  Chapter 14 Client/Server with dbExpress
  Chapter 15 Working with ADO
  Chapter 16 Multitier DataSnap Applications
  Chapter 17 Writing Database Components
  Chapter 18 Reporting with Rave
Part IV - Delphi, the Internet, and a .NET Preview
  Chapter 19 Internet Programming: Sockets and Indy
  Chapter 20 Web Programming with WebBroker and WebSnap
  Chapter 21 Web Programming with IntraWeb
  Chapter 22 Using XML Technologies
  Chapter 23 Web Services and SOAP
  Chapter 24 The Microsoft .NET Architecture from the Delphi Perspective
  Chapter 25 Delphi for .NET Preview: The Language and the RTL
       
  Appendix A Extra Delphi Tools by the Author
  Appendix B Extra Delphi Tools from Other Sources
  Appendix C Free Companion Books on Delphi
       
  Index    
  List of Figures    
  List of tables    
  List of Listings    
  List of Sidebars  

 
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Memory Snap

There are many tools to track the memory status of a Delphi application. During the development of a project, I had to write such a tool, and afterward I made it available.

I've written a custom memory manager that plugs into Delphi's default memory manager, keeping track of all memory allocations and de-allocations. In addition to reporting the total number (something Delphi also does now by default), it can save a detailed description of the memory status to a file.

Memory Snap keeps in memory a list of allocated blocks (up to a given total number, which can be easily varied), so that it can dump the contents of the heap to a file with a low-level perspective. This list is generated by examining each memory block and determining its nature with empirical techniques you can see in the source code (although they are not easy to understand). The output is saved in a file, because this is the only activity that doesn't require a memory allocation that would affect the results. Here is a snippet of a sample file:

157) 00C035CC:  object: [TList - 16]
158) 00C035E0:  buffer with heap pointer [00C032B0]
159) 00C03730:  string: [5-1]: Edit1
160) 00C03744:  object: [TEdit - 544]
161) 00C03968:  object: [TFont - 36]
162) 00C03990:  object: [TSizeConstraints - 32]
163) 00C039B4:  object: [TBrush - 24]
164) 00C039F4:  buffer with heap pointer [00C01FE4]
165) 00C03B34:  buffer with heap pointer [00C01F18]
166) 00C03B48:  string: [0-0]: dD
167) 00C03B58:  string: [11-2]: c:\mman.log

The program could be extended to profile memory usage by type (strings, objects, other blocks), track unreleased blocks, and keep memory allocations under control.

Again, the source code of this component is freely available in the Tools folder of the book's source code.


 
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