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The Latest

Cut and Copy Text to Clipboard

Java 1.1 introduced the java.awt.datatransfer package and its associated classes, which provide the foundation for capabilities such as cut-and-paste. On the surface, the API may appear complex, but this simple

The New long long Data Type

The long long type denotes an integral data type that is at least as large as a long int. On 32-bit architectures and 64-bit architectures, long long occupies 64 bits

The Order of Evaluation of Function Arguments

The order of evaluation of function arguments is unspecified. This means that for a function that takes the arguments (a, b, c), any permutation of this set is a valid

Get a Copy of the ANSI/ISO Standard

The ANSI/ISO C++ Standard is now available for downloading from the NCITS (National Committee for Information Technology Standards) Web site at http://www.cssinfo.com/ncitsgate.html. The downloadable PDF format costs $18. Note that

Debugger Isn’t Invoked

When working on developing or debugging an app created by automation (for example, by ActiveX DLL), if you normally invoke that app from a calling program (EXE), leave the calling

Where Did It Go?

Have you ever wondered why your ActiveX DLL with a form doesn’t show up in the taskbar? Because you’re showing the form modally (.Show vbModal). VB4 only allows DLLs with

Migration from FOCUS 6.0 to SQL Server 7.0

Question: Are there any tools coming with SQL Server 7.0 for this migration from FOCUS 6.0? If not, what is the best way to accomplish this migration? Answer: Yes, DTS

Business Rules and Semantic Object Models

Question: What are business rules in relation to a DBMS. Do you have any posssible examples for a university database? Also: Do you have any hints to drawing a Semantic

SQL and Using Text and Combo Boxes

Question: I write a statement such as frmStatistics.datStatistics.RecordSource = “SELECT * FROM tblSpecialGroup Where Sex = ‘M’ AND Date BETWEEN ‘” & “051099” & “‘” & ” And ” &

Replication: Many Clients, One Central DB

Question: Being new to SQL Server 7.0 I wanted to get other opinions on this: My company has many clients using a proprietary db schema that will replicate transactions to

Event in a form

Question: I’m a beginner VB programmer and am having problems figuring out how to handle events in forms. I have a class that raises an event for each step in

BitSet – Set a bit in a number

‘ Set a bit in a value” NOTE: requires Power2()Function BitSet(ByVal value As Long, ByVal bit As Long) As Long ‘ simply OR with the bit mask ‘ Range checking

Power2 – A power of 2

‘ Raise 2 to a power’ the exponent must be in the range [0,31]Function Power2(ByVal exponent As Long) As Long Static res(0 To 31) As Long Dim i As Long

ShiftRight – Shift a Long to the right

‘ Shift to the right of the specified number of times” NOTE: requires Power2()Function ShiftRight(ByVal value As Long, ByVal times As Long) As Long ‘ we need to create a

RotateRight – Rotate a Long to the right

‘ Rotate a Long to the right the specified number of times” NOTE: requires Power2()Function RotateRight(ByVal value As Long, ByVal times As Long) As Long Dim i As Long, signBits

RotateLeft – Rotate a Long to the left

‘ Rotate a Long to the left the specified number of times” NOTE: requires Power2()Function RotateLeft(ByVal value As Long, ByVal times As Long) As Long Dim i As Long, signBits

BitToggle – Invert a bit in a value

‘ Toggle a bit in a value” NOTE: requires Power2()Function BitToggle(ByVal value As Long, ByVal bit As Long) As Long ‘ simply XOR with the negation of the bit mask

RotateRightI – Rotate an Integer to the right

‘ Rotate an Integer to the right the specified number of times” NOTE: requires Power2()Function RotateRightI(ByVal value As Integer, ByVal times As Long) As Integer Dim i As Long, signBits

RotateLeftI – Rotate an Integer to the left

‘ Rotate an Integer to the left the specified number of times” NOTE: requires Power2()Function RotateLeftI(ByVal value As Integer, ByVal times As Long) As Integer Dim i As Long, signBits

ShiftLeft – Shift a Long to the left

‘ Shift to the left of the specified number of times” NOTE: requires Power2()Function ShiftLeft(ByVal value As Long, ByVal times As Long) As Long ‘ we need to create a

BitClear – Clear a bit in a value

‘ Clear a bit in a value” NOTE: requires Power2()Function BitClear(ByVal value As Long, ByVal bit As Long) As Long ‘ simply AND with the negation of the bit mask

BitTest – Test the value of a bit

‘ Test the value of a bit” NOTE: requires Power2()Function BitTest(ByVal value As Long, ByVal bit As Long) As Boolean ‘ simply AND with the bit mask ‘ Range checking

Build List of Components in Hierarchy

It is sometimes useful to be able to obtain a complete list of the components in a container hierarchy. A getComponents() method is provided in the java.awt.Container class, but it

Pausing SQL Server

Pausing SQL Server prevents new users from logging in and gives you time to send a message to current users asking them to complete their work and log out before

Minimize the Use of Pointers and Dynamic Memory Allocation

Pointer-based operations are less frequently needed than they might seem. For instance, examine this class declaration: class PointerMisuse{private: CDC * m_pDeviceContext;public: PointerMisuse(); ~PointerMisuse();};PointerMisuse::PointerMisuse(){ m_pDeviceContext = new CDC;}PointerMisuse::~PointerMisuse(){ delete m_pDeviceContext;} Even

Beware of Single Quotes When Working With SQL

When concatenating a SQL statement such as INSERT, you may have trouble if your field value contains an apostrophe (‘) such as in “Commedia Dell’Arte.” SQL thinks the apostrophe is

Identify Host That Called Remote Method

When creating remote objects for use with Java’s Remote Method Invocation (RMI), you’ll often extend java.rmi.server.UnicastRemoteObject. When you do extend UnicastRemoteObject, it becomes easy for the remote methods to determine