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Understanding Objects in Computer Programming

Objects are a key element in computer programming. While objects are at center stage in Object Oriented Programming, they are widely used in procedural languages and serve as the building blocks of complete applications * Let’s understand objects!

What is an Object?

Simply put, an object is any “thing” you can actually see, physically.

For example, a person, a car, a pencil, a circle – are all physical objects.

Extending our perception of object to understand how objects are used in computer programming, an object can also offer a well-defined service: A Government...

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Scheduling Automatic Excel VBA Programs for Uninterrupted Execution

Ever needed to run an Excel Macro every day automatically? I mean, without leaving Excel open or interacting with Excel at all. Here’s how you do this taking advantage of two technologies that comes with Windows

Why schedule a daily silent job?

In one of my customer’s project that manages trainings and certifications, employees receive email and SMS notifications on various events: upcoming training reminders, training result (with a certificate attached), change of instructor, training assessment reminders etc.

The technique for doing that is using a queue. All notifications...

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Using Pre-Compiler Directives for Cross-Platform Compatibility of Your Excel VBA Programs

Need your single Excel program to run on Windows and Mac? With Office 32-bit and Office 64-bit? You can do that using pre-compiler directives * Here’s what you need to know (and code!)

In my Blog post from last week In which I elaborated on writing VBA code that runs on both Office 32-bit and Office 64-bit, we ended up with a challenge. We need to include the PtrSafe and LongPtr qualifiers in external libraries declarations for Office 64-bit, but ignore these qualifiers in Office 32-bit environments (where they are unknown).

Today I’ll explain all about VBA’s pre-compiler...

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Writing Excel VBA Code That Runs on Office 32-bit and 64-bit

Your Excel 2016 program runs perfect on your Excel 2016 32-bit, but fails on Excel 2007, or on Excel 2013 64-bit. Why that happens and how to write a fully compatible VBA program? Here are the answers (and some VBA code)

In last week’s Blog post, I explained and demonstrated how Windows functions libraries, or DLLs, can be called from VBA.

Leveraging external functions to Excel is great, especially considering the vast variety of functions the Windows operating system offers. However, breaking the tight Excel environment is also subject to some compatibility issues.

Why are there...

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Calling External Windows Functions (DLL) From Excel VBA

Windows offers tons of readily available functions that perform almost any task we need. Why not make use of it in our Excel VBA programs? * Here’s what you need to know about calling DLLs in Excel VBA

Modular Programming

As you recall from our computer programming lessons, one of the key concepts in good software design is modularity: breaking our code into functional subroutines or functions, each responsible for a specific task with a clear interface for calling it.

Once encapsulated in a self-contained function, this functionality can be re-used in many locations in your program....

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How to Create Your Own Web Service with Google Apps Script and Call it from Excel VBA

Ever needed to perform some Web task in service of your Excel VBA application? You can write your own web-service to do whatever you need * Popular use cases: access Google Sheets, Docs, Presentations, email and calendar from your Excel application!

Calling Web-services from Excel VBA

As I thoroughly explain and demonstrate in my online course: Beyond Excel Boundaries with VBA: Office, Files and Internet, you can send any HTTP request over an Internet connection from VBA using the WinHttp service library. Here’s a code snippet to send a request to some URL:

    Dim...

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Excel VBA: How to Check if Printer is Ready

Your VBA program needs to send out an original document to the printer. What if the printer is offline, or disconnected? Verify the printer is ready before printing or notify the user of a problem * Here’s the VBA function for that

Why check if the printer is ready?

The first situation in which I encountered the need to verify the printer is ready, was in an application I developed for small business management, in Excel.

In my home country, Israel, tax regulations dictate that the tax invoice confirming the receipt of a payment is printed exactly ONCE. This would be the ORIGINAL...

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Excel VBA: Restoring the State of the Application Before Returning Control to the User

When your VBA code finished its task and control is returned to the user – be sure to restore protection, hide Worksheets, enable events, reset the mouse cursor and turn on screen updating * here’s a Sub that will take care of that

A controlled environment for the user

The flexibility, diversity and power of Excel makes it a generic tool for almost any task. However, this richness of options and openness can put your data and business at risk.

Consider a large table you maintain in Excel. Mistakenly, you mis-typed a date to be: 05/10/20020. You didn’t notice. That row is...

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The Power of SQL Applied to Excel Tables for Fast Results

If you ever needed to query Excel tables (and who hasn’t) from your VBA programs that contained thousands of rows, or join multiple tables in the process – this is the Blog post you’ve been waiting for * Write complex SQL queries over Excel tables as if they were stored in a relational database

Do SQL and Excel go together?

YES!

SQL is the most popular Databases language. It is robust, proven and works with extremely large tables stored in any common relational Database software. If you want to learn more about Databases and SQL – read my last week’s Blog post...

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Understanding Relational Databases: The Basics

If you are in anyway related to software in the service of organizations – you MUST be familiar with Relational Databases * Let’s understand the basics of RDB: what, why, strengths and weaknesses

The Beginning

Relational Databases (RDB) drive nearly all of the information systems in the service of any organization today. Despite being a central and critical technology, it’s only 40 years old, 10 years younger than me.

It was Edgar Codd from IBM who first devised the RDB concept in the early 1970’s. Only in 1978 was the first commercial RDBMS (Relational Database...

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