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Question: I have a grid control on a form in Visual Foxpro. I want to keep it unbound and then later fill it with data. I set the recordsource property
Question: I am involved in a project the aim of which is to demonstrate the effectiveness of MMX for image manipulation. For this project I need to write some MMX
Question: We have a use counted object with addRef() and removeRef() functions. When the reference count gets to 0, we want the object to be deleted. Is { delete this;
Question: How can I handle in Windows an IRQ7 interrupt, generated by my own measurement device connected to parallel port? It was easy in DOS. Any generic code would be
hen you time a set of threads, you generally want to know thetime elapsed between when the first thread starts and the last threadfinishes. When you time a single thread,
ne of the great and flexible features of the amazing elastic ADO recordset is that it can be disconnected from its data source, modified, and reconnected to update the data
An object is a contiguous region of memory storage. An lvalue (pronounced: L value) is an expression that refers to such an object. The original definition of lvalue referred to
Ever had a user accidentally create a query that resulted in a Cartesian product of your two largest tables? Of course, a badly written query uses up precious CPU and
Most nontrivial applications are packaged with “resource files,” which are nothing more than files used by the application for various purposes. Some examples of these resources include image (GIF, JPEG)
While the Visual InterDev 6 Scripting Object Model (SOM) is great for rapid development of Web sites, the SOM doesn’t support all HTML attributes. For instance, the SOM doesn’t support
VB6 offers a couple new string functions that work with string arrays. One of these new string functions, Join, concatenates all the items of an array into an individual string
It is now easy to create scripts using the functionality in T-SQL to automate the loading of data into SQL Server with the addition of the bulk insert command in
The Visual InterDev 6 Scripting Object Model provides the navigateURL method for navigating to another Web page based on an event such as a button click. Many people are stumped
When creating programs that use Remote Method Invocation (RMI), you’ll need to obtain a reference to a remote object. Although the name of the specific object will usually be pre-defined
Hexadecimal and octal literals are indicated by special prefixes. A hexadecimal literal is indicated by the ‘0x’ prefix: int n =0x1000; // decimal value of n is 4096 An octal
Suppose you have a table that contains transactions for different products and clients. Each day you need to summarize this information. If you need to know the sales figures for
Since the Visual InterDev Scripting Object Model wraps all its script objects inside a huge HTML Form, you can count the number of form elements using the form’s length property.
A template can take ordinary types such as int and long as parameters: template class Array // type int used a parameter {/*
Java uses the event thread to notify listeners of events by making calls to methods such as actionPerformed() and itemStateChanged(). However, this same thread is also responsible for repainting components.
A template can take as an argument the address of an object with external linkage. A string literal cannot be used as a template argument since it has internal linkage.
Java Database Connectivity (JDBC) drivers sometimes perform conversions on Structured Query Language (SQL) statements that you execute before sending them to the database. It can be helpful for debugging purposes
JavaScript has a powerful mechanism to create and execute code on the fly using the eval() statement. This statement takes a string as a parameter. This string is then run
SQL Server 7 has taken great strides in improving its security model. Groups have been done away with and replaced by roles. The practical difference lies in the fact that
VB stores symbolic and literal constants internally using the simplest data type possible; this means that most common numeric constants-such as zero or one-are stored as Integers. If you use
Don’t use an empty For…Next loop to add pauses to your programs; instead, use the Sleep API function, that releases the CPU and lets other apps in the system effectively
In VB applications compiled as native code, GoSubs are 5-6 times slower than calls to regular Subs or Functions; conversely, in p-code they are considerably faster. This is one of
OK, this is a silly suggestion, but I personally know a lot of developers that complain about Visual Basic’s bugs that were fixed in more recent Service Packs. This is
Use the And operator instead of Mod when the divisor is a number in the form 2^N. For instance, there are two methods to extract the least significant byte in
‘ ShellSort an array of any type” ShellSort behaves pretty well with arrays of any size, even’ if the array is already “nearly-sorted”, even though in’ particular cases BubbleSort or
If your application uses objects from external components, either third-party or your own libraries, a good rule of thumb is to include the complete servername.classname string in the Dim statement,
