In applications that cannot be recompiled (e.g., apps that are installed on a customer’s machine as binaries only), values of constants may change occasionally. For example, exchange rates and the

By default, std::cin ignores leading whitespaces when it reads input from the keyboard or file. For example, if you execute the following statement: char name[10];cin>>name; and the user enters the

Private Declare Function GetUrlCacheEntryInfo Lib “wininet.dll” Alias _ “GetUrlCacheEntryInfoA” (ByVal sUrlName As String, lpCacheEntryInfo As Any, _ lpdwCacheEntryInfoBufferSize As Long) As Long’ Check whether the file identified by the URL

‘ Get system information using Active Directory” Returns True if successfull” Returns the following information in its parameters’ ComputerName’ DomainName’ PDC Name’ UserName” NOTE: requires a reference to the Active

‘ Get a description of the processor using Active Directory” NOTE: requires a reference to the Active DS Type libraryFunction GetCpuDescription() As String Dim thisComputer As ActiveDs.IADsComputer Dim thisService As

‘ Add an URL to the IE’s favorites by sending a client side JavaScript to IE’ sURL is the URL that the link will point to’ sDescr is the description

Private Declare Function InternetGetConnectedState Lib “wininet.dll” (ByRef _ lpSFlags As Long, ByVal dwReserved As Long) As LongConst INTERNET_CONNECTION_MODEM = 1Const INTERNET_CONNECTION_LAN = 2Const INTERNET_CONNECTION_PROXY = 4Const INTERNET_CONNECTION_MODEM_BUSY = 8′ return

The VB IDE remembers most of the configuration settings that were active when you closed the previous session. However, the maximized status of child MDI windows (the code editor and

Often, while developing a system you want to debug it using System.out.println or System.err.println. When development is over you would like to send all those messages to file. The easiest

If you are writing an application in which you don’t know the class of an object until runtime, then you cannot use the new operator to instantiate the object. This

The assert macro can be used to detect errors as soon as they occur. This macro is defined in the include file , and is used that way: assert (expression)

Use the following code: Public Function IsLeapYear(iYearToCheck As Integer) As BooleanIsLeapYear=IsDate(Format(

Put the control(s) in a frame and disable the frame. This will even eliminate graying out or color changes.

In C++, this can be achieved by throwing an exception from your Constructor. Since Constructors cannot return a value, this is the only way to achieve error handling. Class MyClass{

If your program uses the WebBrowser control or any Microsoft Internet Control, you must ensure (and clearly specify in your app’s documentation) that the program can only work on systems

A simple way to add some pizazz to your forms is by minimizing them and then closing them, instead of making them disapper istantaneously. Just try this code: Private Sub

Private Declare Function SendMessage Lib “user32” Alias “SendMessageA” (ByVal _ hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _ lParam As Any) As LongPrivate Const WM_USER As

In some cases you might want to activate a form given its name, but VB doesn’t let you do it directly. However, it is easy to create a function that

Copying and pasting text and images programmatically isn’t difficult at all, using the methods of the Clipboard object. However, implementing a generic Edit menu that copies and pastes the highlighted

If a form contains a RichTextBox control and other controls that are capable to receive the input focus, when the focus is on the RichTextBox and the user presses the

‘ Open a single pane Explorer window’ sRoot is the root folder to open’ bUpwardAllowed specifies whether the user will be allowed to navigate ‘ upward the root” Example:’ OpenSinglePaneExplorer

Private Type PRINTER_INFO_2 pServerName As String pPrinterName As String pShareName As String pPortName As String pDriverName As String pComment As String pLocation As String pDevMode As Long pSepFile As String

Private Declare Function SetFileAttributes Lib “kernel32” Alias _ “SetFileAttributesA” (ByVal lpFileName As String, ByVal dwFileAttributes As _ Long) As Long’ Associate an icon to a folder, by creating a desktop.ini

‘ Load the specified REG file in the registryPrivate Sub ApplyRegFile(ByVal sRegFile As String) On Error Resume Next ‘first of all, check if the file exists If Not (GetAttr(sRegFile) And

Private Const HKEY_CLASSES_ROOT = &H80000000Private Const HKEY_CURRENT_CONFIG = &H80000005Private Const HKEY_CURRENT_USER = &H80000001Private Const HKEY_LOCAL_MACHINE = &H80000002Private Const HKEY_USERS = &H80000003’Save the specified registry’s key and (optionally) its subkeys to

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