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DevX - Software Development Resource

DeleteRegistryValue – Delete a value from the Registry

Private Declare Function RegDeleteValue Lib “advapi32.dll” Alias _ “RegDeleteValueA” (ByVal hKey As Long, ByVal lpValueName As String) As LongPrivate Declare Function RegOpenKeyEx Lib “advapi32.dll” Alias “RegOpenKeyExA” _ (ByVal hKey As

DevX - Software Development Resource

GetRegistryValue – Read the value of a Registry key

Private Declare Function RegOpenKeyEx Lib “advapi32.dll” Alias “RegOpenKeyExA” _ (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, _ ByVal samDesired As Long, phkResult As Long) As

DevX - Software Development Resource

CreateRegistryKey – Create a key in the Registry

Private Declare Function RegCreateKeyEx Lib “advapi32.dll” Alias _ “RegCreateKeyExA” (ByVal hKey As Long, ByVal lpSubKey As String, _ ByVal Reserved As Long, ByVal lpClass As Long, ByVal dwOptions As Long,

DevX - Software Development Resource

SetRegistryValue – Write a value in the Registry

Private Declare Function RegOpenKeyEx Lib “advapi32.dll” Alias “RegOpenKeyExA” _ (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, _ ByVal samDesired As Long, phkResult As Long) As

DevX - Software Development Resource

DeleteRegistryKey – Delete a key of the Registry

Private Declare Function RegDeleteKey Lib “advapi32.dll” Alias “RegDeleteKeyA” _ (ByVal hKey As Long, ByVal lpSubKey As String) As Long’ Delete a registry key” Under Windows NT it doesn’t work if

DevX - Software Development Resource

GetRegisteredUser – Retreive the name of the registered user

Private Declare Function GetVersion Lib “kernel32″ () As LongConst HKEY_LOCAL_MACHINE = &H80000002′ Return the name of the registered user” Requires the GetRegistryValue functionFunction GetRegisteredUser() As String Dim regKey As String

DevX - Software Development Resource

Determining the Top Level Frame

Question: I have developed a custom AWT component that can be placed at any level in a component hierarchy. How can it determine the top level Frame in the hierarchy?

DevX - Software Development Resource

Enumerating Methods of a Class

Question: How can I enumerate the methods of an object? I know there must be away since JBuilder and other IDEs know how to populate a list ofmethods from a

DevX - Software Development Resource

Select All Checkboxes

Question: I have several checkboxes and I want one checkbox tocause all of the checkboxes to be selected when it is selected. Howcan I do this? Answer: Even though the

DevX - Software Development Resource

JPasswordField

Question: How do I access the contents of a JPasswordField to see if it matcheswith the correct password? Answer: Before using a class, it helps to examine all of the

DevX - Software Development Resource

SystemCalls

Question: Is there any method (MFC, Win32) to get the contents of the systemvariable “PATH”? Answer: Sure there is. Use the standard function getenv() for this purpose: #include { char

DevX - Software Development Resource

Mouse Click Coordinate

Question: I know how to detect a mouse click with a MouseListener, but how doI obtain the coordinates associated with the click? Answer: If you already know how to detect

DevX - Software Development Resource

Database Field Types

Question: How do I get a string representation of a database field using JDBCregardless of its type? In other words, I have to use the getInt(),getDate(), getString(), etc., to get

DevX - Software Development Resource

RE: Date Arithmatic in Java

Question: I previously asked a question that may not have been worded as clearlyas possible and you answered something slightly different from what Iwas looking for. I want to know

DevX - Software Development Resource

Enumeration Types

Question: Can you make an array of enumeration types?If so, how do you do it? Answer: Yes you can, and it is very simple: enum direction { Up, Down};direction arr[10];

DevX - Software Development Resource

InetAdress.getAllByName

Question: When I use InetAdress.getAllByName(String host) on my workstation,I get two IP addresses. One is for the LAN connection and the other isfor the dialup connection. I need to get

DevX - Software Development Resource

Produce Shrinking Text

Use this code to get the shrinking text effect?similar to the opening of Star Wars: ‘ Requires a Label and Timer on the formPrivate Sub Form_Load() With Me .BackColor =

DevX - Software Development Resource

Replace a String Within a String, Recursively

I recently needed a substring replacement function for inserting code into a module, by reading the code from a file. Unfortunately, in my case, commas are interpreted as delimiters, and

DevX - Software Development Resource

Cache Properties for Repeated References

If you have to reference a control’s property repeatedly, it’s better to assign the property to a temporary variable, then use that variable. This technique is called property caching. For

DevX - Software Development Resource

Force Slider to Specific Intervals

Try using a slider control in your UI if you’re tired of combo boxes. Users find this control intuitive to understand and operate. For example, you might use the slider

DevX - Software Development Resource

Sort Non-String Items in a ListView

Sorting ListView columns with numeric data can be a real pain. Nonstring sorting is possible with callbacks using custom comparison functions, but this method’s drawback is that the synchronization between

DevX - Software Development Resource

Determine the Correct Screen Dimensions

The latest video drivers can change the display resolution without rebooting. Unfortunately, the Screen object doesn’t always properly return the new display size; it only remembers the display size when

DevX - Software Development Resource

Clear Form’s Controls With Quick Loop

This code allows you to set a form’s controls to a specific value. You can use it, for example, when you want to clear all textboxes in a form or

DevX - Software Development Resource

Use the MsgBox Wrapper to Replace OK

Replace all MsgBox calls that display only an OK message with the following OkMsg sub. It automatically defaults the icon to vbInformation, and the title to a global constant defined

DevX - Software Development Resource

Determine the File System Type

With the advent of the FAT32 file system, you might want to use VB to determine the type of file system being used for a particular drive. This example is