The DegreesToXYsubroutine, part of CodeBank’s standard procedurelibrary, calculates the X (horizontal) and Y (vertical) coordinatesof any point, measured in degrees, on the circumference of a circleor ellipse. As you can
Designing monitor resolution-independent applications is a frequentproblem Visual Basic programmers face. The simplest solution isto design forms at the 640 by 480 resolution found in most lap-topcomputers. Such a form
You cannot use the IsEmpty function to determine if a variableof type Form or any Object has been assigned a value. You can,however, use this method to determine if the
When you’re finished tinkering with your apps, close and restart VBbefore making the final EXE. This simple action can reduce the size ofyour EXE by 10 to 30 percent (many
You cannot load a VB4 form in VB3 directly. You must modify theform definition. When you open a VB4 form, the file will resemblethe example: VERSION 4.00Begin VB.Form Form1 Caption
Programmers are in the habit of creating meaningful identifiersby concatenating the words of a “title case” phrasethat describes the identifier, such as LastName or FinalPaymentDate.Often, you can use these names
I needed a way to issue a DoEvents to allow Windows time to redraw controlson a form, but wanted to prevent the user from clicking some other controlwithin my application.
In many cases, it is best to select or highlight the full text of afield when that field gains the focus. This allows the user to simply begintyping to replace
One way to test whether a specific file exists is to open thefile for input and check VB’s error flag. An error will occurif the file does not exist. Use