Microsoft KB Archive/122353

= How to Determine If a VB App is Running Under Windows NT 3.x =

Article ID: 122353

Article Last Modified on 12/9/2003

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APPLIES TO


 * Microsoft Visual Basic 2.0 Standard Edition
 * Microsoft Visual Basic 3.0 Professional Edition
 * Microsoft Visual Basic 2.0 Professional Edition
 * Microsoft Visual Basic 3.0 Professional Edition

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This article was previously published under Q122353



SUMMARY
There are some scenarios in which your program should behave differently when running under Windows NT version 3.x instead of under Windows version 3.x. For example, an application based on Windows NT needs to handle networking API calls differently. Therefore it is important to find out whether or not your Visual Basic program is running under Windows NT. This article shows you how.



MORE INFORMATION
A call to the Windows API GetWinFlags function returns a 32-bit value representing the current system status. By performing a binary AND on this flag with the hexadecimal value &h4000, you can determine whether the underlying operating system is Windows NT version 3.x or not.

Step-by-Step Example
 Start a new project in Visual Basic. Form1 is created by default. Place a command button (Command1) on Form1.  Add the following code to the general declarations section of Form1: Const WF_WINNT = &H4000& Declare Function GetWinFlags Lib "KERNEL" As Long

Function IsWindowsNT As Integer IsWindowsNT = (GetWinFlags And WF_WINNT) End Function   Add the following code to the Command1 Click event procedure: Sub Command1_Click If IsWindowsNT Then MsgBox "You are running under Windows NT" Else MsgBox "You are running under Windows version 3.x"     End If   End Sub  Test the program by running it and clicking the command button.

Additional query words: 2.00 3.00

Keywords: kbhowto kbenv KB122353

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