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Friday, April 11, 2008 12:54 PM

Examine .Net Memory Leaks

Writing programs using .Net is very productive. One reason is because much of memory management is “managed” for you. In C, C++ and other “native” languages, if you allocate memory, you’re responsible for freeing it. There were stopgap measures, like
Posted by Calvin_Hsia | 6 Comments
Monday, January 07, 2008 1:35 PM

Uninstall VB6 causes error message: You do not have a license to use this control

I was running out of disk space on one of my machines, so I used my TreeMap program to see where I could delete files to save space. I saw that I still had VB6 on the machine, and I didn’t need it on that machine any more, so I uninstalled it. It's amazing
Posted by Calvin_Hsia | 2 Comments
Thursday, September 13, 2007 5:43 PM

Run your application forms on the web

I received a customer question: I have looked all over the web and still searching, and found your blog. I have a very specific issue and I need to ask whether this is doable first of all and how to do it after. First of all, I need to make a foxPro app
Posted by Calvin_Hsia | 1 Comments
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Monday, March 12, 2007 6:34 PM

The MVPs are coming!

I was quoted in this Computerworld article about the MVP summit, which is happening this week in Seattle . The author says I compiled a “spreadsheet that ranked the most prolific posters on the FoxPro forum”. That is slightly incorrect: obvious to Fox
Posted by Calvin_Hsia | 3 Comments
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Monday, October 09, 2006 12:26 PM

Write your own hangman game

Many years ago (1985) I wrote a C program to play Hangman. I had decoded a word processor spelling dictionary for my word source. More recently, I have encoded 2 spelling dictionaries for general purpose use: 1 with 171201 words, the other with 53869.
Posted by Calvin_Hsia | 6 Comments
Tuesday, September 19, 2006 10:24 AM

Visual Sorting Algorithm comparison

When I bought my first IBM PC around 1981, I wrote a program to demonstrate the speed of various sorting algorithms. It filled the screen with random characters, then the user could choose amongst a few sorting techniques and watch the sort algorithm
Posted by Calvin_Hsia | 3 Comments
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Tuesday, September 05, 2006 5:39 PM

Turtle Graphics Logo Program

Warning: this simple program produces mesmerizing spirographic images that seem hallucinatory in nature! Discretion is advised! Do not drive while watching these graphics! Almost 30 years ago, I had heard about a concept developed by Professor Seymour
Posted by Calvin_Hsia | 11 Comments
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Thursday, July 27, 2006 10:50 AM

What was that strange character? The mystery deepens

In my last post, What's that funny character? , I asked about a particular character. In fact, another mystery character can occur. Embarassingly, SET CARRY ON was set on my machine when I ran the code, and I didn’t add it to the sample. It’s off normally
Posted by Calvin_Hsia | 4 Comments
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Wednesday, July 26, 2006 9:38 AM

What's that funny character?

Run this code: CREATE CURSOR foo ( line c( 100 )) LIST STRUCTURE TO t.txt APPEND FROM t.txt sdf GO RECNO ()- 1 FOR i = 1 TO LEN ( TRIM ( line )) ?i, SUBSTR ( line ,i, 1 ), ASC ( SUBSTR ( line ,i, 1 )) ENDFOR It produces t.txt which looks like this: Structure
Posted by Calvin_Hsia | 8 Comments
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Monday, January 16, 2006 10:16 AM

A Discounter Introduces Reductions: Multiple Anagrams

Many moons ago, I was playing with spelling dictionaries (see What is an index anyway? ) and anagrams. After decoding a spelling dictionary for a word data base in the early 1980s, I wrote some word games, like scrabble and anagrams. APT, PAT, and TAP
Posted by Calvin_Hsia | 10 Comments
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Friday, December 02, 2005 4:54 PM

What is a Microsoft MVP? Calvin's List updated for the new century

In this definition of Microsoft MVP on the Wikipedia is a description of a list that I maintained that helped me to earn the Microsoft Most Vocal Person award over a dozen years ago. I plugged in my modem and dialed up CompuServe daily to download foxforum
Posted by Calvin_Hsia | 9 Comments
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Tuesday, November 08, 2005 11:07 PM

Load, Call, Character Generators, and "Letter Quality" printers

I remember early versions of FoxPro had the LOAD and CALL commands (try typing them in the command window!) that allowed you to put binary code directly into memory and run it! Back about 20 years ago, I wrote code in Foxbase that I hand assembled into
Posted by Calvin_Hsia | 3 Comments
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Tuesday, August 30, 2005 6:36 PM

Computer music on the radio

If you listen to an AM radio that’s placed near a computer, you can hear interference. I can put my radio next to my tablet and hear all the calculations being done as my ink handwriting is being converted to text. The AM frequency range is from 530 to
Posted by Calvin_Hsia | 2 Comments
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