Question Changing Measurement Units of Form to from Pixels to Twips

dineshkumaar · #1 (**permalink**) 01-19-2010, 11:47 PM

Hi everybody!

Is there any way so that i can set the measurement unit of a form from Pixels to Twips?

Regards

Thanks

jmcilhinney · #2 (**permalink**) 01-20-2010, 3:04 AM

No, it's not. You'll have to perform the conversion yourself. Here's how it's done when upgrading VB6 code to VB.NET:

Code:

Private Shared Sub SetUpTwipsPerPixel(ByVal Optional Force As Boolean = False)
    If (Not Support.m_IsTwipsPerPixelSetUp OrElse Force) Then
        Support.m_TwipsPerPixelX = 0
        Support.m_TwipsPerPixelY = 0
        Try 
            Dim dC As IntPtr = NativeMethods.GetDC(NativeMethods.NullIntPtr)
            If Not dC.Equals(NativeMethods.NullIntPtr) Then
                Support.m_TwipsPerPixelX = (1440 / CDbl(NativeMethods.GetDeviceCaps(dC, &H58)))
                Support.m_TwipsPerPixelY = (1440 / CDbl(NativeMethods.GetDeviceCaps(dC, 90)))
                NativeMethods.ReleaseDC(NativeMethods.NullIntPtr, dC)
            End If
        Catch exception1 As Exception
            ProjectData.SetProjectError(exception1)
            ProjectData.ClearProjectError
        End Try
        Support.m_IsTwipsPerPixelSetUp = True
        If ((Support.m_TwipsPerPixelX = 0) OrElse (Support.m_TwipsPerPixelY = 0)) Then
            Support.m_TwipsPerPixelX = 15
            Support.m_TwipsPerPixelY = 15
            VB6Errors.RaiseError(7, Resources.GetResourceString("Misc_SetUpTwipsPerPixel"))
        End If
    End If
End Sub

As you can see, it involves invoking the Windows API. As such, it's a bit of a pain but you can implement something similar yourself.

JohnH · #3 (**permalink**) 01-20-2010, 8:02 AM

You can reference Microsoft.VisualBasic.Compatibility and use these properties and functions:

Code:

Microsoft.VisualBasic.Compatibility.VB6.TwipsPerPixelX 
TwipsPerPixelX
TwipsToPixelsX(x)
TwipsToPixelsY(y)

dineshkumaar · #4 (**permalink**) 02-04-2010, 2:01 PM

Thankyou very much!

jmcilhinney · #5 (**permalink**) 02-04-2010, 7:40 PM

Quote:

Originally Posted by JohnH

You can reference Microsoft.VisualBasic.Compatibility and use these properties and functions:

Code:

Microsoft.VisualBasic.Compatibility.VB6.TwipsPerPixelX 
TwipsPerPixelX
TwipsToPixelsX(x)
TwipsToPixelsY(y)

I'm not 100% sure why but those methods have been marked obsolete in .NET 4.0, so it's probably best not to rely on them. I'm not sure what that means for upgraded VB6 code.

JohnH · #6 (**permalink**) 02-04-2010, 9:24 PM

Quote:

Note: This API is now obsolete.

Indicates to me the whole VB6 thing is obsolete: Microsoft.VisualBasic.Compatibility.VB6 Namespace () Time to move on by getting started with VB.Net

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