delphi start only one instance of application

This smample show how to start only one instance of software per client machine first in Your myapplication.dpr write this code:

Delphi check for valid entered email, works on android

This function checks whether the supplied string is a valid email. Code worked on Win32 platform and ANDROID Compiler.

Calculate EAN 13 barcode checksum

Delphi code for calculating checksum of given 12 symbols from EAN 13 barcode

Delphi, how to get serial number of hard disk where installed application

Delphi how to check file version of two files

By trial found an easy way to compare whether a file is a new version of the other Here is code:

Delphi XE, how to make archive ZIP files or extract files from ZIP, with build in functions

Delphi after version Xe have unit system.Zip, with this unit Zip andUNzip functions are easy 🙂

proecedure to extract files from ZIP

Delphi check for valid email

This procedure checks whether a valid e-mail