Unidev Tech Blog

How to Migrate from HP-UX to Linux: NULL

Scott McKellar — Mon, 09 Jan 2012 21:16:29 +0000

On Linux I tried to compile a C program that I had brought over from HP-UX and got the following warning: foo.c: In function 'bar': foo.c:42: warning: assignment makes integer from pointer without a cast The code in question terminates a character string with a nul character. However, instead of coding the nul character as [...]

Panel View or Multiple Horizontal Pager View in Android

Ravi Julakanti — Fri, 23 Dec 2011 15:12:59 +0000

Android doesn’t provide a default horizontal pager view. It appears as though the Gallery and Horizontal Scroll View can provide this same functionality. The solution described below allows for easy left and right swipes to load different screens controlled by a single activity. We’ll look at an example of how to use these classes to [...]

Outsourcing Mobile Development

Rob Vigil — Tue, 13 Dec 2011 19:04:30 +0000

As a senior mobile software developer here at Unidev, with over 20 years of client, web-based, and mobile development under my belt, I have learned one simple truth. Software development companies are not the same. Outsourcing overseas, although inexpensive, comes at a price. Many times clients look for the quick, cheap way to get their [...]

Optimizing for the iPhone “Retina Display” and Other High Resolution Devices

Kevin — Thu, 08 Dec 2011 15:29:16 +0000

Optimizing for the iPhone “Retina Display” and Other High Resolution Devices The iPhone 4 and new iPhone 4s come featured with Apple’s “Retina Display”. This is a 3.5 inch screen with a resolution of 960×640 at 326 pixel per inch. Compared to its predecessor, the iPhone 3GS, this display is a very significant improvement. Once [...]

Test of Spring MVC annotations

George — Tue, 22 Nov 2011 16:10:14 +0000

Spring 3 MVC annotation based controller make Unit Testing real easy and straight forward. Since you don’t have to implement any interface or extend super classes for controller as you used to do in Spring 2, you can call methods in controller directly for Unit Testing without Spring or any other container. With Spring MVC [...]

Minification and Cache-busting in Asp.Net

Matt — Fri, 12 Aug 2011 18:03:36 +0000

Most users of popular libraries like jQuery tend to use a few jQuery plugins also. One project I’ve worked on has 10 jQuery plugins, plus a few scripts that are common across all pages on the site. Each script has to be downloaded, parsed, and executed before your page loads in full. So, a proliferation [...]

How to Migrate from HP-UX to Linux: Encryption

Scott McKellar — Thu, 11 Aug 2011 20:16:08 +0000

We use some utility encryption routines in C for various purposes. When I first tried to migrate these routines from HP-UX to Red Hat Linux, I ran into a problem right away: the linker couldn’t find the libcl.a library. There is no library by that name in Linux, and I had no idea what the [...]

Fast Data Loading with SQL Server 2008

Matt — Mon, 01 Aug 2011 21:26:37 +0000

A common operation in many systems is bulk loading of data into a database, be it from another system, a flat file, or generated output, which may or may not involve updating existing records. A lesser known class in .Net, SqlBulkCopy, and a new feature in SQL Server 2008, MERGE can greatly increase the speed [...]

Password Storage Best Practices

Matt — Mon, 01 Aug 2011 18:40:53 +0000

With the several high profile security breaches so far this year, security is on the forefront of most developers minds, or it should be. Though, if one has never coded good authentication code before, it can be a rather daunting task. The Internet is rife with poor advice, old advice, or just plain wrong advice. [...]

How to Migrate from HP-UX to Linux: Undefined Behavior

Scott McKellar — Wed, 27 Jul 2011 22:04:45 +0000

The C and C++ languages don’t try to define the results of every syntactically correct program. For example, if you dynamically allocate some memory, and then free it, and then try to access the memory you freed, you invoke undefined behavior. The C and C++ standards don’t specify how the program will respond. Undefined behavior [...]