If you’re writing an ActiveX control, you can create properties that return an enumerated value, as in: Public Enum SizeConstants SizSmall = 1 SizMedium SizLargeEnd EnumPublic Size As SizeConstants When
If you heavily use API calls and strictly follow the SDK documentation, you might be tempted to use the GetLastError API to retrieve the error returned by your last API
Visual Basic lets you test the state of mouse buttons only inside a MouseDown, MouseMove, or MouseUp event procedure. To determine the current state of mouse buttons you can use
Private Declare Sub CopyMemory Lib “kernel32” Alias “RtlMoveMemory” (dest As _ Any, source As Any, ByVal bytes As Long)’ Return the low word of a Long valueFunction LowWord(ByVal value As
It is highly unfortunate that Visual Basic doesn’t offer a way to execute a group of statements only when the program is interpreted in the environment or only when it
Using “pure” VB, the only way to build a generic routine that returns the number of dimensions of an array passed as an argument is using a loop that repeatedly
Short-circuit evaluation is an optimization technique automatically adopted by most modern compilers, including all flavors of C++, Borland Delphi and many others. Unfortunately, the Visual Basic compiler is not in
When you build your ActiveX controls and components, Visual Basic automatically creates all the GUIDs as necessary. The same also happens in other cases, without you even realizing it: for
Visual Basic lets you test the state of the Shift, Alt and Ctrl keys only within the KeyUp, KeyDown and all the mouse-related event procedures. If you want to test