Can I determine if I am on Win7 OS from VB6?

I have an old program written in VB6 which needs to run on 3 different platforms, including my laptop which is running Win7. I googled how to determine OS from VB6 and found some code which I slightly modified as follows:

Declare Function GetVersionExA Lib "kernel32" (lpVersionInformation As OSVERSIONINFO) As Integer

Public Type OSVERSIONINFO
    dwOSVersionInfoSize As Long
    dwMajorVersion As Long
    dwMinorVersion As Long
    dwBuildNumber As Long
    dwPlatformId As Long
    szCSDVersion As S开发者_JAVA百科tring * 128
End Type


Private Const VER_PLATFORM_WIN32s = 0
Private Const VER_PLATFORM_WIN32_WINDOWS = 1
Private Const VER_PLATFORM_WIN32_NT As Long = 2


Private Function GetOS() As String
    Dim osinfo As OSVERSIONINFO
    Dim retvalue As Integer
    Dim sOS as String

    osinfo.dwOSVersionInfoSize = 148
    osinfo.szCSDVersion = Space$(128)
    retvalue = GetVersionExA(osinfo)

    Select Case osinfo.dwMajorVersion
        Case 7
            sOS = "?"  'Win7?
        Case 6
            sOS = "Vista"
         Case 5
            sOS = "XP"
         Case 4
            sOS = "Win2000"
     End Select

     MsgBox (sOS)
     return sOS     

End Function

When I run this from my WIN7 laptop, osinfo.dwMajorVersion = 5, which suggests it is on an XP machine.

What's ocurring here? Can I determine if I am running Win7 using this method? What's the best way of getting the info I need?

Windows 7 is actually version 6.1, not version 7. You're checking for the wrong number. Otherwise, I'm not really sure why the code you've shown doesn't work. At least one problem is that there is no return keyword in VB 6. The last line in your GetOS function should be GetOS = sOS, instead. Once I fix those problems, it works just fine for me as well.

I have a full working solution available here. It detects all known versions of Windows quickly and accurately. I've personally tested this on at least 5 different versions of Windows with nary a hitch. All that you have to do is copy and paste the code into your project, and it just works.

Here's proof that it works correctly on my Windows 7 laptop:

I'm really not sure why everyone is working so hard to propose alternative, partially-working solutions. This one is guaranteed to work, or your money back. If it doesn't work for you, make sure that you are not running the application under "Windows XP Mode" or some other virtual machine.

Windows 7 has version 6.1.7600 that's majorversion 6, minorversion 1, build 7600 in your code. The reason why you are seeing MajorVersion 5 is probably because of a compatibility setting. Right-click your .exe, select properties and look in the "compatibility" tab.

I tried all the API calls and code but always ended up with Windows XP for some or other reason. Used this "hack" to solve my problem and it works for me.

Private Function GetMyWindowsVersion() As String    
Dim r As Long, bFile As Integer, verString As String, fResult As String, bracketStart As Integer, verInfo As String, bracketEnd As Integer, versionLength As Integer

fResult = "Windows OS"

bFile = FreeFile
Open App.Path & "\checkos.bat" For Output As #bFile    
    Print #bFile, "@echo off"    
    Print #bFile, "ver > version.txt"    
    Print #bFile, "exit"    
Close #bFile

r = Shell(App.Path & "\checkos.bat", vbMinimizedNoFocus)

bFile = FreeFile    
Open App.Path & "\version.txt" For Input As #bFile    
    Do Until EOF(bFile)    
        Line Input #bFile, verString    
        If Trim(verString) <> "" Then    
            bracketStart = InStr(verString, "[")    
            bracketEnd = InStr(verString, "]")    
            If bracketStart And bracketEnd > 0 Then    
                versionLength = bracketEnd - bracketStart    
                verInfo = Mid(verString, bracketStart + 1, versionLength - 1)    
                If InStr(verString, "6.2") Then    
                    fResult = "Windows 8 " & verInfo    
                End If    
                If InStr(verString, "6.1") Then    
                    fResult = "Windows 7 " & verInfo    
                End If    
                If InStr(verString, "5.") Then    
                    fResult = "Windows XP " & verInfo    
                End If    
                Exit Do    
                Else    
                fResult = verString    
                Exit Do    
            End If    
        End If    
    Loop    
Close #bFile    
GetMyWindowsVersion = fResult    
End Function

Take a look at the following site. This works for detecting Vista and Windows 2008, with some minor enhancement it should work for Windows 7.

Your lookups are wrong; dwMajorVersion 5 is win2k or XP, 6 is Server 2k8 R2 or Win 7 - you need to take into account dwMinorVersion to make your detection accurate. (Table of values)

This is what you are looking for....

Option Explicit



Private Const VER_PLATFORM_WIN32s = 0
Private Const VER_PLATFORM_WIN32_WINDOWS = 1
Private Const VER_PLATFORM_WIN32_NT = 2

Private Const VER_NT_WORKSTATION = 1
Private Const VER_NT_DOMAIN_CONTROLLER = 2
Private Const VER_NT_SERVER = 3

Private Type OSVERSIONINFOEX
    dwOSVersionInfoSize As Long
    dwMajorVersion As Long
    dwMinorVersion As Long
    dwBuildNumber As Long
    dwPlatformId As Long
    szCSDVersion As String * 128
    wServicePackMajor As Integer
    wServicePackMinor As Integer
    wSuiteMask As Integer
    wProductType As Byte
    wReserved As Byte
End Type

Private Declare Function GetVersionExA Lib "kernel32" (ByRef lpVersionInformation As OSVERSIONINFOEX) As Long




Public Function GetWindowsVersion() As String
    Dim osinfo As OSVERSIONINFOEX
    Dim retvalue As Integer

    osinfo.dwOSVersionInfoSize = 148
    osinfo.szCSDVersion = Space$(128)
    retvalue = GetVersionExA(osinfo)

    With osinfo
        Select Case .dwPlatformId
            Case 1
                Select Case .dwMinorVersion
                    Case 0:         GetWindowsVersion = "Windows 95"
                    Case 10:        GetWindowsVersion = "Windows 98"
                    Case 90:        GetWindowsVersion = "Windows Millenium"
                End Select

            Case 2
                Select Case .dwMajorVersion
                    Case 3:         GetWindowsVersion = "Windows NT 3.51"
                    Case 4:         GetWindowsVersion = "Windows NT 4.0"

                    Case 5
                        Select Case .dwMinorVersion
                            Case 0: GetWindowsVersion = "Windows 2000"
                            Case 1: GetWindowsVersion = "Windows XP"
                            Case 2: GetWindowsVersion = "Windows 2003"
                        End Select

                    Case 6
                        Select Case .dwMinorVersion
                            Case 0: GetWindowsVersion = "Windows Vista/2008"
                            Case 1: GetWindowsVersion = "Windows 7/2008 R2"
                            Case 2: GetWindowsVersion = "Windows 8/2012"
                            Case 3: GetWindowsVersion = "Windows 8.1/2012 R2"
                        End Select
                End Select

            Case Else
                GetWindowsVersion = "Failed"
        End Select
    End With
End Function

Thanks for the code. However I have tried this on Windows 7 Ultimate and it reports as "XP" with "version 5.1"?

Ok I have just tried the following and it seems to be working fine. This is using the MS SysInfo control.

Private Sub Command2_Click()

    Dim MsgEnd As String
    Select Case SysDetectOS.OSPlatform
        Case 0
            MsgEnd = "Unidentified"
        Case 1
            MsgEnd = "Windows 95, ver. " & _
                     CStr(SysDetectOS.OSVersion) & "(" & _
                     CStr(SysDetectOS.OSBuild) & ")"
        Case 2
            MsgEnd = "Windows NT, ver. " & _
                     CStr(SysDetectOS.OSVersion) & "(" & _
                     CStr(SysDetectOS.OSBuild) & ")"

            If SysDetectOS.OSVersion >= 6.01 Then
                MsgEnd = MsgEnd + " Win7"
            End If        
    End Select
    MsgBox "System: " & MsgEnd    
End Sub