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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.

To zero-initialize an object of type T means that the memory storage occupied by the object is set to binary zeros. More precisely, if T is a built-in data type,

Consider the following class: class A // lacks default constructor { public: A(int x, int y); }; Class A doesn’t have a default constructor. Therefore, the following array declaration will

The standard &ltmath.h> header declares the function ceil() and floor(). These function round the fractional part of a floating point number. ceil() returns the smallest integer that is no less

You’re probably familiar with const member functions such as: class A { public: int get_x() const; // can’t change A’s state }; C++ also supports volatile member functions. You declare

In the body of a non-static member function, the keyword this is a non-lvalue expression whose value is the address of the object for which the function is called. However,

Question: Instead of trapping an Error by its value (If err.number=429 then…) I would prefer to use a VB defined Constant Name.I can’t seem to find a way to locate

Question: I wrote a VB program that uses MS-Access (MDB) type data base using DAO . The application gathers a huge amount of information (25meg a week) and accesses the

Question: I am developing an application in VB which requires Reminders. On the basis of dates input, if the current date goes past the date in the database it should

Question: A common practice in C is to do something like this to initialize an array of structs: typedef struct {float x,y,z;} Vector3;Vector3 VecList[] = {{1,0,0},{0,1,0},{0,0,1}};// Now VecList[0] = {1,0,0};//