Many programmers believe that by storing pointers instead of objects in a container, they improve performance. However, they forget that the pointers still refer to existing objects that must be

The stack is a region of memory on which local automatic variables are created and function arguments are passed. The implementation allocates a default stack size per process. On modern

Consider the following two classes: class A{private: int n;public: int m;};class B{private: int n; int m;}; Theoretically, the memory layout of these two classes may be different because A has

To block a class from being derived any further, declare its constructor private. Next, add a public static member function Instance() that creates an instance of this class and returns

When you declare a nested class as a friend of its containing class, place the friend declaration after the declaration of the nested class, not before: class A // containing

Question: I’m trying to install a search facility on a database program I have written using VB6 and an Access database. I’ve opened by inserting a data control onto my

Question: I’d like to know how can I make a return of a function’s local variable (for example, a reference to it) not using pointers technique? Answer: You have tow

Question: I am getting a compile error ‘huge’ obsolete keyword. I am converting a process from Visual C++ 2.0 to 6.0. What keyword could I use in place of ‘huge’?

Question: How can I dynamically build a procedure call string and then get it to execute? Ex. Dim action as String action = “proc(param1,param2)” call action I know this does

Question: In MFC, what does the following declaration do? CPen::operator HPEN() const; My understanding of the operator keyword is that you cannot use it to create a new operator; however,

When working with a forward-only, read-only Recordset – that is, the default ADO Recordset – the RecordCount property always returns -1. (This can also happen with other types of server-side

Suppose you have two tables named Table1 and Table2 with one or more fields named the same way. Now, consider this query: rs.Open “SELECT * FROM table1 INNER JOIN table2

The syntax for opening a password-protected Jet database might not be obvious. In fact, assigning the password to the Password property in the ConnectionString raises the following error: Run-time Error:

If you try to use a DataList and some labels or text boxes linked to an ADO Data control, and you click on some items in the list, you’ll notice

A file DSN is nothing but a text file that contains all the parameters for an ODBC connection. To prove this, just go to the default directory that holds all

Here is a little tip to check if any of your .class files are corrupted or if they are not .class files generated from a .java file. There Related Posts

You can connect a MS-Access database to SQL Server as a linked server, and query Access tables in SQL Server’s Query Analyzer. This can help in porting data from Access

LIKE is probably the VB operator is most underutilized if compared to its potential. The most immediate use for this operator is to check that a string begins or ends

Constructor is a special kind of method which gets called automatically whenever the object is created. One class can have zero, 1 or more then 1constructors. Basically, you can overload

Question: I have several forms in different pages which are linked using a tab approach. I would like to pop-up a confirmation window if someone is moving from one tab

Question: Why is the following code not working? Javascripts January Februrary March 1 2 3 4 5 2000 2001 passdate1: January Februrary March 1 2 3 4 5 2000 2001

Question: How can I make different CSS styles to be loaded depending on the platform a user has (Mac or PC)? Answer: The simplest way to do this is to

It can be very useful to have a central public function for manipulating themouse pointer in a Visual Basic application. This function can help youorganize how the hourglass is shown

Always be careful when checking adoRS.Fields(i).Name, the stringfor this property is case sensitive. If in a database there’s a field named BANK_BALANCE_AMT,RS.Fields(i).Name will not recognize “bank_balance_amt”: In such a case

The standard locale framework was added to ANSI/ISO C++ in 1994. In essence, it consists of template classes called “locales”, which use facets. A facet represents a certain cultural convention

Consider the following class: class A{public: A(int size);private: int size;}; You can initialize the member size in at least three forms: A::A (int size) : size (size) { } //

Although you can allocate multidimensional arrays manually, as in: int (*ppi) [5]=new int[4][5]; // parentheses required // fill arrayppi[0][0] = 65;ppi[0][1] = 66;ppi[0][2] = 67;// Related Posts How AI deepfakes