If class B uses only pointers or references of class A, you don’t have to include A.h. You can simply forward declare class A as shown below. //File B.hclass A;

Suppose you want to pass a Boolean system property, -DDEBUG=true or -DDEBUG=false, from the command line. Normally, you’d probably use the following in source code to retrieve it: boolean b

// Quickly zero out a struct. This can be applied// To an array of structs also, since// memset() initializes memory regions#include struct sample {int a;short int b;int c;};struct sample s;//

The new ANSI C++ standard specifies that variables declared as in for(int i=1; …) have a scope local to the for statement. Unfortunately, older compilers (like Visual C++ 5.0) use

Use the following code: select *,right(field1,4) as Col1 from [Tablename]order by col1 You can do it by using substring: SELECT *, substring(field1, 3, 5) as col1from [tablename]order by col1

‘*********************************************************************’Text files Reading’You can use Microsoft Text Driver’*********************************************************************Public Function Read_Text_File() As ADODB.Recordset Dim rs As ADODB.Recordset Set rs = New ADODB.Recordset Dim conn As ADODB.Connection Set conn = New ADODB.Connection

This code will do the trick: ABCDEFGHIJKLMNOPQRSTUVWXYZ

It is possible to use VB6 ActiveX controls – such as ADO Data Control, Chart Control, Comm Control, and the Windowless controls – with the designer of Visual Studio .NET,

If your solution contains a setup project and this setup project has been built at least once, you get an Assembly Load error when you run the Inheritance Picker in

When you need a timer for a larger interval than the Timer control allows, insert this code into a BAS module. The procedure starts when the timer interval has passed:

Dynamic Color Change of TextHello Good Morning

When you

If you have dynamically generated form controls on a Web page, all with the same name, this is a good way to parse out each control’s value and load them

Here

The Option button is a convenient way to display multiple options from which only one can be selected. One problem is that the Option button cannot be bound to a

Many professional applications are required to display a version number on all screens to indicate to users which version of the app is currently running. This also helps with configuration

‘ Saves a text file. If the destination file already exists,’ its content can be replaced, or the new content can be appended’ at the end of the file, according

‘ Returns the content of the specified text file’ Note: it can throw an exception’ Usage: Dim FileContent As String = LoadTextFile(“C:Autoexec.bat”)Function LoadTextFile(ByVal FilePath As String) As String Dim sr

‘ Copies a source directory to the destination directory.’ The last parameter specifies whether the files already present in the’ destination directory will be overwritten’ – Note: requires Imports System.IO’

‘ Returns the size of the specified directory’ – Note: requires Imports System.IO’ – Usage: Dim DirSize As Long = GetDirectorySize(“D:Projects”)Function GetDirectorySize(ByVal DirPath As String) As Long Dim DirSize As

‘ Open the standard dialog to download a file located on the server’ whose virtual path is passed as an argument. This routine is useful when’ you want to download

You can use the name of a Function or Property Get procedure as a local variable anywhere in the procedure. If your procedure returns a String or UDT type, writing

You can stop a program

To determine whether a control is a member of a control array, you can reference its Index property and handle the generated error when the control is not in an

When the user presses Cancel on a VB InputBox, the string returned is a vbNullString. If the user inputs a zero-length string and presses OK, the return string is empty

The CheckBox control in VB supports three positions: Checked, Unchecked, and Grayed. Unfortunately, the default behavior for the control is to cycle between Checked and Unchecked. To set it to