The following routine launches the default browser and loads the specified URL in it. The argument doesn’t have to include the HTTP:// prefix. If the operation is successful it returns
You’re probably aware of the overhead that is associated with calling a virtual member function. However, the performance penalty in this case might even be higher than you think because
When you call a virtual member function from a class’s constructor, the actual function that gets called is the one defined in the object whose constructor is executing. Virtual member
There’s a common myth among Visual C++ programmers that it’s OK to use delete instead of delete [] to release arrays built-in types. For example, int *p = new int[10];
Browsers Targeted: Internet Explorer 4 and 5 With Internet Explorer 4.0 and above, you can create an arbitrary property on any HTML object. This property, called an expando property, stays
Browsers Targeted: Internet Explorer 3+, Netscape 3 and 4 Sometimes, you need to set up events to happen at periodic intervals. Perhaps the simplest application of this is a clock.
With applets, sometimes the browser acts as the applet’s frame. This prevents the user from mistaking the browser window for a separate application and closing it. With this approach, the
In Java, a readable, writable directory should be empty before an attempt is made to remove it. The following code recursively empties a directory, and its sub-directories, and then removes
Sometimes it is useful to have a text field, for which you can specify a max number of characters. The following class give you just that: import java.awt.*; import java.awt.event.*;