[C] Checking license status

slc.dll

SLIsWindowsGenuineLocal
ptr to dword size buffer

0= genuine

 

What to see if the OS is activated?

Code:

    Private Sub bgwls(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgwls.DoWork
        Try
            Dim status As String
            status = String.Empty
            Dim objMgmt As System.Management.ManagementObject
            Dim LicenseStatus As New System.Management.ManagementObjectSearcher("root\CIMV2", "SELECT LicenseStatus FROM SoftwareLicensingProduct")
            For Each objMgmt In LicenseStatus.Get
                If objMgmt("LicenseStatus") = "1" Then
                    status = "Licensed"
                    Exit For
                Else
                    status = "Unlicensed"
                End If
            Next
            e.Result = status
        Catch ex As Exception
            'Your error code
        End Try
    End Sub
    Private Sub bgwls_Completed(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles bgwls.RunWorkerCompleted
        Try
            status = e.Result
            Label1.Text = status
        Catch ex As Exception
            'Your error code
        End Try
    End Sub

bgwls is simply a background worker. This can easily be converted.

 

Just import the slc.dll from 'C:\Windows\System32' and call the function SLIsWindowsGenuineLocal() that's IntPtr and convert to DWORD in code.

I've no extensive experience with C, but I participated in some projects on my life...

 

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I feel you guys have not fully explained what the slc part does.

SLIsWindowsGenuineLocal

This is just the Software Licensing Client (SLC). SPPCEXT.dll is the file which actually activates the copy of Windows regardless of the Version from Vista - Windows 8 last I checked. IF my memory serves me correctly Microsoft created a License checking tool which was called the Microsoft Genuine Diagnostic Tool which was released again I believe in response to WAT which went after the permissions on one of the spp files. I would start with that diagnostic tool instead of the Software Licensing Client file.

http://download.microsoft.com/download/9/F/3/9F3DED28-A521-4352-B8A4-20368D0CC1AA/MGADiag.exe

 

Windows 8 ships with it's own diagnostic tool Licensingdiag.exe, sure there's other apis
available but SLIsWindowsGenuineLocal is simple to use and its invoked when you check activation
status in control panel and also used by the metro ui.

 

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If you get stuck I can always whip up a project for you. Just let me know what language and IDE.

Also, if you use WMI and code it correctly it will load instantly. People would usually put 'Select * From' when using WMI, that makes it cycle through everything in that instance instead of selecting what you want.

 

WMI would be the best if you want more than just static version strings to be more dynamic

http://msdn.microsoft.com/en-us/library/windows/desktop/aa389762(v=vs.85).aspx

start here. its for C++ good luck

 

Oh, C++. Over my head dude. VB or C# for me. I can do either one of those.

 

you could also use cscript and start the slmgr.vbs process and take the output and use that data to your liking

 

WMIC also, then manage the return code...