Question: class a;typedef void(a::*func)();class a{protected: int x;public: func f; void fg(){f=&a::as;}; void as();}; This code compiles in Visual C++6.0. However, Borland C 3.1 gives me the following error at line”void

Question: I have two Informix databases existing on a Unix server. How do I write a stored procedure in one database that can access data from the other database? Answer:

Question: How do I get the addresses of primitive variables, reference variables, and objects in Java? Answer: Unlike systems programming languages like C, Java does not have pointers. Objects are

Question: When you compare two objects through the”== operator,” Java checks for reference equality. For example, if you create two String objects with “new” keywords and initialize them with same

The easiest way to retrieve the IP address assigned to the local machine during an Internet session is by means of the LocalIP property of the Internet Transfer Control: MsgBox

The Microsoft Scripting Runtime Library offers a FileSystemObject and a Drive object that allow you to check if a Floppy drive is ready. Before writing the code you have to

Under Windows 98 and 2000 you can control the speed of the mouse. The mouse speed determines how far the pointer will move based on the distance the mouse moves.

You can programmatically swap the meaning of the left and right mouse buttons, to account for your left-handed users. All you need is a call to the SystemParameterInfo API function

The Windows API provides an handy function that lets you cascade all the child windows of another window with one single call. The effect of this function is similar to

Private Declare Sub CopyMemory Lib “kernel32” Alias “RtlMoveMemory” (dest As _ Any, source As Any, ByVal bytes As Long)’ encrypt a string using a password” you must reapply the same

In C, the “sprintf” function will format a string, including integer values, to a specific length. For example, you could do “sprintf(%2d)”; and it would show 00 as part of

I’m continually suprised by the number of veteran Java programmers(those with more than six months’ experience) I encounter who aren’taware that the full source code for the standard Java libraries

The Java language system has a very useful native method, which copies an array from the specified source array, beginning at the specified position, to the specified position of the

Question: I’m reading approximately two million characters into an array. The max number of elements that Borland Turbo C++ 5.02 allows me is not enough. Can I declare this array

Question: In qbasic there is a command called LOCATE. What it does is locate where you want your output on the screen, eg: locate 1,1: meaning one down and one

Many applications create temporary files that exist as long as the program is running and are later discarded. For example, a Web browser can store a list of pages that

To generate a unique filename that won’t conflict with any other files that exist in the current directory, use the tmpnam() function declared in as follows: char * tmpnam(char *

Another new feature in C99 is called designated initializers. Designated initializers enable you to initialize specific array elements without having to initialize the entire array. For example, suppose you have

The std::getline() functions reads data from an input stream and writes it to a string object. Unlike cin’s >> operator, getline() also reads white spaces, which makes it useful for

Suppose you receive an int from a remote host and you wish to convert it to big-endian order. Here is another portable solution for handling of big and littleendian data

You can never tell just what your users are going to do. Sometimes, their browser settings aren’t quite optimal for your site, and you are forced to cater to the

This code adds the appearance of a grid control to a traditional listview, drawing lines between rows and columns: Private Declare Function SendMessageLong Lib

An easy way to find the number of words in a given string: Dim varArray as VariantvarArray = Split(

If your application connects to Microsoft SQL Server, you can use two features to make your login easy and low maintenance. The first choice is to use OLE DB instead

This undocumented feature of VB6 lets you create new controls at run time. In previous versions, one had to create a control array at design time in order to be

Nowadays, components are popularly used in VB projects. These components can sometimes make it hard to determine which component has an error when the application stops running. This is especially