VBA API Calls Get total monitors and screen resolution


Example

Option Explicit

'GetSystemMetrics32 info: http://msdn.microsoft.com/en-us/library/ms724385(VS.85).aspx
#If Win64 Then
    Private Declare PtrSafe Function GetSystemMetrics32 Lib "User32" Alias "GetSystemMetrics" (ByVal nIndex As Long) As Long
#ElseIf Win32 Then
    Private Declare Function GetSystemMetrics32 Lib "User32" Alias "GetSystemMetrics" (ByVal nIndex As Long) As Long
#End If

'VBA Wrappers:
Public Function dllGetMonitors() As Long
    Const SM_CMONITORS = 80
    dllGetMonitors = GetSystemMetrics32(SM_CMONITORS)
End Function

Public Function dllGetHorizontalResolution() As Long
    Const SM_CXVIRTUALSCREEN = 78
    dllGetHorizontalResolution = GetSystemMetrics32(SM_CXVIRTUALSCREEN)
End Function

Public Function dllGetVerticalResolution() As Long
    Const SM_CYVIRTUALSCREEN = 79
    dllGetVerticalResolution = GetSystemMetrics32(SM_CYVIRTUALSCREEN)
End Function

Public Sub ShowDisplayInfo()
    Debug.Print "Total monitors: " & vbTab & vbTab & dllGetMonitors
    Debug.Print "Horizontal Resolution: " & vbTab & dllGetHorizontalResolution
    Debug.Print "Vertical Resolution: " & vbTab & dllGetVerticalResolution

    'Total monitors:         1
    'Horizontal Resolution:  1920
    'Vertical Resolution:    1080
End Sub