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Friday, March 27, 2009 11:39 PM

Comment/Uncomment code to switch versions quickly without using macros

In a typical day, I write or debug programs in several languages: typically Foxpro, C#, VB, C++ and 32 bit assembly, with an occasional MSIL, IDL and 64 bit ASM thrown in. Sometimes, I like to switch between one version of code and another. This is useful
Posted by Calvin_Hsia | 7 Comments
Monday, January 19, 2009 6:47 PM

Overload Operator new to detect memory leaks

There are various leak detection methods for memory allocators. A popular one is to tag each allocation with some information about the caller. When there’s a memory leak, you just need to look at that tag info to find the line of code that allocated
Posted by Calvin_Hsia | 5 Comments
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Wednesday, December 03, 2008 2:55 PM

Write simple Debug helpers to help you debug and maintain your code

Much of my time is spent using the Visual Studio debugger examining code to figure out how it works and how to fix it. When stepping through a function, the values the function uses are very useful for code understanding. The debugger shows these values
Posted by Calvin_Hsia | 3 Comments
Monday, July 28, 2008 2:34 PM

Make your code more maintainable: The evils of the Return statement

What does it mean to make code more maintainable? Certainly obfuscated code is hard to understand, by definition. A big part of maintainability is making it easier for others to read and understand what the code is doing. Your code may have been working
Posted by Calvin_Hsia | 9 Comments
Wednesday, May 28, 2008 12:24 PM

How fast is interop code?

How fast is interop code? If you’re in one kind of code and your calling another, what is the cost of the interop? For example, .Net code can call native C++ code (like Windows APIs) and vice versa. Similarly with Foxpro and C++ code. .Net code is often
Posted by Calvin_Hsia | 22 Comments
Thursday, May 03, 2007 4:50 PM

Vista Aero DWM seems to optimize out GDI paint calls

In this post: Foxpro Menu items, combo boxes not refreshing selected item under Aero in Vista I describe a problem in Foxpro where menu and list items that are supposed to be non-selected aren’t painted correctly. I described a workaround: call the GdiSetBatchLimit
Posted by Calvin_Hsia | 7 Comments
Tuesday, May 01, 2007 2:30 PM

Windows Vista Aero BorderStyle Paint problem as non Administrator

Above is an image of an inner form (from the C++ project below) before and after I dragged it a little bit up and left to obscure the title bar, then back to the original position. You can see the title, icon, close/minimize buttons were not painted correctly.
Posted by Calvin_Hsia | 9 Comments
Friday, April 27, 2007 5:31 PM

Fix your forms to paint borders correctly under Vista Aero

Apparently, the borders of some forms don’t get painted correctly on Windows Vista. When executing a Fox Form, Fox asks Windows to create a window, then sets the BorderStyle of the window. Apparently, under Vista Aero (except as Administrator), the BorderStyle
Posted by Calvin_Hsia | 15 Comments
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Thursday, April 26, 2007 11:28 AM

Foxpro Menu items, combo boxes not refreshing selected item under Aero in Vista

If you’re running a Foxpro application under Vista when using Aero , you might encounter a problem when scrolling through lists, such as intellisense dropdowns, comboboxes, menus. As you move from one item in the list to the next, each item in turn appears
Posted by Calvin_Hsia | 11 Comments
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Monday, August 28, 2006 5:07 PM

Create an ActiveX control using ATL that you can use from Fox, Excel, VB6, VB.Net

Creating an ActiveX control is a good exercise in understanding how one works. It also helps to have full control over its source code for learning and testing purposes. A customer asked about migrating legacy ActiveX controls over to .Net. Many controls
Posted by Calvin_Hsia | 21 Comments
Monday, August 07, 2006 3:07 PM

Host the CLR and Generate IL to call a MessageBox

Here’s some C++ code to host the CLR. It’s an alternative to using COM Interop (s ee A Visual Basic COM object is simple to create, call and debug from Excel ), or using a User Control (see Create a .Net UserControl that calls a web service that acts
Posted by Calvin_Hsia | 6 Comments
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Monday, February 06, 2006 1:03 PM

Customize the VS debugger display of your data

As a software developer, I spend much of my time looking at code, learning how it works, and figuring out how to modify or fix it. A very good tool to help examine code is the Visual Studio debugger. (Even if you’re not a hard core programmer, the following
Posted by Calvin_Hsia | 14 Comments
Wednesday, November 09, 2005 10:00 PM

Windows Security and how it affects running generated code

Here I described how VFP generates executable code and runs it for early and late binding COM clients and implementing COM interfaces. However, there is an important issue with generating and running executable code in the same process. A computer has
Posted by Calvin_Hsia | 6 Comments
Wednesday, June 30, 2004 4:36 PM

What is a C0000005 crash?

In my blog about Dr. Watson I talked about product crashes. What is an example of a crash? How destructive is it? Here’s a simple example. MyFunction takes a string parameter and calculates its length MyFunction ( char * StringParam) { int nlen;
Posted by Calvin_Hsia | 31 Comments
 
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