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Since 1998, DevX has helped people start businesses, build websites, and provide enterprise technology to people globally. Interviewing the likes of Microsoft’s co-founder, Steve Ballmer, the publication brings comprehensive, reliable, and accessible insights to the Internet.
Globally unique identifiers (GUIDs) distinguish hardware, software, and users. Originally, Microsoft designed the GUID value for use with ActiveX controls; Windows uses a 128-bit GUID to identify ActiveX controls. A
ne of the ever-present challenges facing mobile application developers is maintaining the look and feel of applications across different devices. There is an untold number of mobile devices such as
am sure you have already found out why you should be wary of static, application-global and module-global variables in COM+ components written in VB. As for me, one wonderful day
The following routines convert a numeric value into a string that represents the number, and vice versa. They are useful for reading data written by QuickBasic programs, because the QuickBasic
I happened to come across a serious problem when installing my own software with Visual Installer 1.1: the installation of my product on Windows 98 computers caused a system crash
‘ Return a collection of strings that identify the installed versions of the ‘ .NET Framework’ Note: this function require the EnumRegistryKeys and EnumRegistryValues ‘ functions’ Example:’ Dim version As
‘ Return a Boolean value indicating whether the .NET Framework is installed’ Note: this function require the CheckRegistryKey functionsFunction IsDotNetFrameworkPresent() As Boolean Const HKEY_LOCAL_MACHINE = &H80000002 IsDotNetFrameworkPresent = CheckRegistryKey(HKEY_LOCAL_MACHINE, _
If you install a COM+ application proxy on a client and open its Properties dialog, you’ll see that the field “Remote Server Name” is set to the server where you
Here it is some code that shows how to use reflection to dynamically set an event handler for a class’ event. Sub TestSub() ‘ create a Person Dim pe As
Some control events provide the mouse pointer’s current position within the control’s client area; others provide only the screen coordinates of the mouse pointer (the same as returned by Cursor.Position).
et’s face it. Caching is a fancy was of saying that you are going to save some type of data somewhere. In the n-tier web application model, your tiers are
‘ Find a control in a hierarchy of controls’ Example:’ Dim txtCtl As Control = FindControlRecursive(DataGrid1, “FirstNameTextBox”)Function FindControlRecursive(ByVal ctrl As Control, _ ByVal id As String) As Control ‘ Exit
‘ Return the index in a ListControl given a value’ Example:’ Dim i As Integer = GetIndexFromText(ListBox1, “hellovalue”)Function GetIndexFromValue(ByVal lst As ListControl, ByVal value As String) As _ Integer Return
‘ Select the ListControl element with a given text’ Example: SelectItemFromText(ListBox1, “hello”)Sub SelectItemFromText(ByVal lst As ListControl, ByVal value As String) lst.SelectedIndex = lst.Items.IndexOf(lst.Items.FindByText(value))End Sub
‘ Return the index in a ListControl given a text’ Example:’ Dim i As Integer = GetIndexFromText(ListBox1, “hello”)Function GetIndexFromText(ByVal lst As ListControl, ByVal value As String) As _ Integer Return
‘ EvalFileName ensures that the basename of a file or directory’ conforms to the Microsoft file naming guidelines (see MSDN webpage)’ http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/’ naming_a_file.asp” Return value:’ True = Valid basename’ False
The VB’s MkDir function creates a directory in a specified path. If the directory already exists, MkDir raises error 75 (Path/file access error); yet, it raises the same error code
‘ Select the ListControl element with a given value’ Example: SelectItemFromValue(ListBox1, “hellovalue”)Sub SelectItemFromValue(ByVal lst As ListControl, ByVal value As String) lst.SelectedIndex = lst.Items.IndexOf(lst.Items.FindByValue(value))End Sub
Being an avid Access Programmer I have been frustrated with the limitation of VB DropDownLists to using only 1 field as the value. I found a way to simulate/work around
When you don’t need the full capabilities of an XmlDocument object, you can use an XmlTextReader, the SimpleElement class explained by Guang Yang, and a Stack to create the lightweight
Editor’s Note: This tutorial is also available in a version for Java developers. Get the Java version. ML is rapidly gaining popularity with application developers as a data storage and
he Enterprise Portal (EP) is SAP’s corporate portal application that runs primarily on its own J2EE-certified Web application server. Java iViews, the portal components (or portlets) in SAP, deliver business
sing memory-mapped files can get you tremendous performance gains, but memory-mapped files are very delicate: any change is immediately reflected in the filesystem. This article describes a checkpointing system that
s is often the case in title fights, it didn’t really get interesting until the last round. On an otherwise uninspiring Monday night, in the grand ballroom of a Redwood
ost Windows applications need to use graphics or images to let users work with the images directly, or to enhance the user experience. Most applications can accomplish this with static
ich client, (or in .NET terminology, “Windows Forms”) applications provide a great user experience in terms of functionality, usability, operating system and inter-application integration. Unfortunately, they have also suffered from
TurboVBLite is the freeware version of TurboVB. It provides eighteen add-ins that make VB development easier and faster. It helps sorting and writing procedures and properties, error handlers, variable declarations,
he Pool Manager described in the first part of this article series had a couple of problems. The process of acquiring a pooled object was not transparent to the client,
‘ Flip an image on one or both axes. The x and y’ parameters are the coordinates of the upper-left point’ Note: requires Imports System.Drawing.Imaging” Example:’ Dim gr As Graphics
‘ Skew an image by a given amount along one or both axes (the dx and dy ‘ parameters)’ The x and y parameters are the coordinates of the upper-left
