If you do a lot of floating-point division operations in VB, you can optimize these operations by multiplying by the reciprocal value. For example, instead of performing this calculation: X/Y

You might have wished you could right-click on a VB file and open it in Notepad, or copy a snippet of code for another app you

I often open up many windows in a VB project when I

When I use variables that need to be saved to the Registry or to an INI file, I sometimes forget to place the API call after the variables in a

I program all reusable components into DLLs or OCXs. To provide a consistent error-handling technique across all my projects, I use the Raise method of the Err object in all

ShellExecute is one of the most flexible Win32 APIs. Using ShellExecute, you can pass any filename, and if the file

You can allow users to resize a control?just like in VB design mode?with a mouse, using two simple API calls. You can resize the control?top-left, top, top-right, left, right, bottom-left,

When you create generic functions, remember that many functions are a two-way street. For example, many general utility modules contain both LoWord and HiWord functions. However, to compose a Long,

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Question: I’m using a function named Browseforfolders() that uses the following code: Private Declare Function SHBrowseForFolder Lib “shell32.dll” _Alias “SHBrowseForFolderA” (lpBrowseInfo As BROWSEINFO) As Long and the declaration of this

Question: How do I run a SQL stored procedure from within Visual Basic? Answer: The easiest way is to use the Execute method of either the Database object (DAO) or

Question: I have two varibles, one containing the name of another varible, and one containing a string. How can can I set the varible that’s name is contained in the

Question: I have a database of strings of hex numbers and I want to convert them to decimal. There doesn’t seem to be a function for it, but can you

Question: I want to Transfer records from one Database table to other Database table but through VB. I can’t write a query such as I can for SQL Server: Insert

Question: I am building an SQL statement to Insert and Update records. If the user enters a double quote mark in the text box the SQL statement treats this as

Question: I have a struct: struct mystruct{ DWORD dw_Id;}*pMystruct; In the following function I want to pass the address of ‘dw_Id’ which is a member of mystruct. How do I

Question: When using Queryinterface in COM, why is the interface pointer cast to void** andwhy is it passed as a pointer to a pointer (double indirection)? Answer: This is because

Question: If I use malloc locally in a function do I have to use free as well? Won’t someother piece of the application eventually chew up the memory I mallocd,

Question: I’ve writen a program that simulates a heat circulation, and one of its functions performs an optimization processwhich uses a lot of dynamic memory. Myquestion is, can I use

Question: Is there an equivalent of the CallByName function that returns a list of proprety and method names for an object? Answer: No, there isn’t. If you need that, you

Question: What is a concrete class? Answer: A class that is neither derived from another class nor is meant to serve as the base for other classes is a concrete

Question: Do you know of a tool that helps to either eliminate or identify dead code? Answer: You don’t need a special tool to detect dead code. Every decent compiler

RuleZero 1.2, the easiest and fastest add-on tool for creating database-driven Web pages in Visual InterDev 6 is now free. You can get a copy from Vertigo Software’s site, www.vertigosoftware.com.

Several member functions of std::string might throw exceptions. For example, if you use a very large number to specify the initial storage size, string’s constructor will throw an exception: string

Suppose you define a the following list object and you need the address of one of its elements: std::list li; std::list ::iterator iter = li.begin(); In many contexts, iter functions

It’s perfectly legal to call a member function?virtual or not?from a destructor. However, you should avoid calling a member function that accesses data members that have already been destroyed. For

On exit from a scope, destructors are called for all local automatic objects that are declared in that scope, in the reverse order of their declaration. For example: void f()

Consider the following program: int func(); main() { int n = 0; int arr [2] = { func(), n}; /* ok in C++, not in C */ } A C

A POD (plain old data) type is a union, struct or class with no user-declared constructors, no private or protected non-static data members, no base classes, and no virtual functions.