The advantages of a string object over a C-style char* are obvious. Yet there are times you may still need a null-terminated char*, for example, when legacy C code is

Whenever your class uses a type-field, as in the following case: class Internl { //internationalization aid Lang lg; //type field FontResource fonts public: enum Lang {English, Hebrew, Danish} Internl(Lang lang)

Here is useful code for a generic routine to load a grid from anSQL statement. The example shown is for RDO and Sheridan’s grid,but works with minor modification for any

If you are rolling your own controls in VB5 to support applications dealing with databases, consider putting a “Valid” property, “Validation” event, and a “Required” property on your controls. The

Question: Using an Editmask on a date field, PowerBuilder does not allow a date greater than 12/31/2999. We would like to allow users to enter a ‘high date’ of 12/31/9999

Question: Can you have more than one JavaScript per page? If so, how do you do it? Answer: Yes. You can have more than one script block per page as

Question: How do I insert a row in a drop-down datawindow in PowerBuilder? Answer: You need to use a function of the datawindow control called GetChild. This function returns a

Question: We have an application that uses Powertool as a class library. We want to move to PFC. Do you have any suggestions on how to accomplish this task? Is

Question: How can I simply turn a monotonous 2-D table into a 2-D chart representation using JavaScript language? Or do I have to use Java for this purpose? Answer: Sorry.

Question: Where can I find a good book or good doccumentation on Visual InterDev 6.0? Answer: As you’ve discovered, the online Help is disabled in the Visual InterDev March Pre-release.

Question: I know that the multimedia API is limited in the Windows CE environment, but is there any other way to control the audio device? What I want is to

Question: Can someone help with identifying/deciphering the hex instruction 0x70fd2b7b of JavaScript into a corresponding command? My application randomly causes the IE4 browser to crash. The instruction is always the

A constructor taking a single argument is by default an implicit conversion operator: class C { int I; //… public: C(int i);//constructor and implicit conversion operator //as well }; void

When initializing objects data members by a mem-initializer list, the compiler transforms the list into the order of the declaration of the data members in that class: class A {

The use of malloc() and free() functions in a C++ file is not recommended and is even dangerous: 1. malloc() requires the exact number of bytes as an argument whereas

If your class contains other object(s) as members, you should initialize the embedded object(s) in a mem-initializer list instead of assigning their values inside the class constructor: class Person {

All member functions implemented within a class declaration are by default inline: //file: A.hclass A { int a; public: int Get_a() { return a; } //declaration + definition; //implicitly inline

When working on developing or debugging an app that is created via automation (i.e. ActiveX DLL), keep in mind the following: if you invoke that app from a calling program

Be aware that the VB IDE hijacks the registry settings for your public classes when working on projects such as ActiveX DLLs and Controls. The IDE will temporarily replace (in

When passing a variant array by reference, make sure to use Dim to declare the statement before using Redim. Example: Private Sub Command1_Click()Dim x as integer ReDim v(2) As Variant

When you have multiple web pages calling the same client script code, locate the shared script code in a separate file (e.g. Shared1.js) and reference the shared code in each

You can change the types of files recognized by the DevStudio editor by adding the file type to the following registry key: HKEY_CURRENT_USERSoftwareMicrosoftDevStudio5.0IstudioProjectEditors For example, to allow JavaScript source files

Fast, Efficient and Easy Way to Initialize Local ArraysBy default, local data arrays created on the stack are not initialized; they contain garbage values. The easiest, most efficient and future-proof

Assigning an object to itself is disastrous, so whenever you have to define a copy constructor and assignment operator, make sure your code is guarded from such a mistake: class

Sometimes it may be tempting to declare class data members as public. However, this is not recommended for the following reasons: 1. Users of such class rely heavily on its

When developing stored procedures in SQL Server, use the SET NOCOUNT ON option at the start of your procedure. This will prevent the superfluous “row count” messages from being generated,

Never declare a variable as a “New” of type “object,” but always rather just as of type “object.” If you do so you will always increment the reference count of

Question: I developed a very tiny project in Visual Interdev: * Made a connection in de 32-bit ODBC (Control panel) with the Access97 Database and DSN name. * Add data

Question: Is there a way to ‘easily’ convert betweenHexadecimal and decimal with VB 5.0 Profesional.(ie. Without doing the long conversion from hex to ascii, then using the conversion factor, then

Question: How can I make shell level calls from a java program? For example, I want to execute the “ls -al” command from java and return its values back to