http://www.developerfusion.com/thread/49351/vb-dual-screen/
Retrieving information about your dual monitor setup can be done with the code below.
Attribute VB_Name = "MonitorInfo"
Option Explicit
Public Declare Function LoadLibraryEx Lib "kernel32.dll" Alias
"LoadLibraryExA" (ByVal lpFileName As String, ByVal hFile As Long, ByVal
dwFlags As Long) As Long
Public Declare Function GetProcAddress Lib "kernel32.dll" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Public Declare Function GetModuleHandle Lib "kernel32.dll" Alias "GetModuleHandleA" (ByVal lpModuleName As String) As Long
Public Declare Function FreeLibrary Lib "kernel32.dll" (ByVal hLibModule As Long) As Boolean
Public
Declare Function EnumDisplayMonitors Lib "user32.dll" (ByVal hdc As
Long, ByRef lprcClip As Any, ByVal lpfnEnum As Long, ByVal dwData As
Long) As Boolean
Public Declare Function GetMonitorInfo Lib
"user32.dll" Alias "GetMonitorInfoA" (ByVal hMonitor As Long, ByRef lpmi
As MONITORINFOEX) As Boolean
Public Const CCHDEVICENAME = 32
Public Const MONITORINFOF_PRIMARY = &H1
Public Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Public Type MONITORINFOEX
cbSize As Long
rcMonitor As RECT
rcWork As RECT
dwFlags As Long
szDevice As String * CCHDEVICENAME
End Type
Dim MonitorId() As String
Public Sub Test()
' At the bottom I have pasted the results on my system.
Dim i As Integer
Debug.Print "Number of monitors in this system : " & GetMonitorId
Debug.Print
For i = 1 To UBound(MonitorId)
PrintMonitorInfo (MonitorId(i))
Next i
End Sub
Public Function GetMonitorId()
ReDim MonitorId(0)
' Of course dual screen systems are not available on all Win versions.
If FunctionExist("user32.dll", "EnumDisplayMonitors") = True Then
If EnumDisplayMonitors(&H0, ByVal &H0, AddressOf MonitorEnumProc, &H0) = False Then
Failed "EnumDisplayMonitors"
End If
End If
GetMonitorId = UBound(MonitorId)
End Function
Private Sub PrintMonitorInfo(ForMonitorID As String)
Dim MONITORINFOEX As MONITORINFOEX
MONITORINFOEX.cbSize = Len(MONITORINFOEX)
If GetMonitorInfo(CLng(ForMonitorID), MONITORINFOEX) = False Then Failed "GetMonitorInfo"
With MONITORINFOEX
Debug.Print "Monitor info for device number : " & ForMonitorID
Debug.Print "---------------------------------------------------"
Debug.Print "Device Name : " & .szDevice
If .dwFlags And MONITORINFOF_PRIMARY Then Debug.Print "Primary Display =
True" Else Debug.Print "Primary Display = False"
With .rcMonitor
Debug.Print "Monitor Left : " & .Left
Debug.Print "Monitor Top : " & .Top
Debug.Print "Monitor Right : " & .Right
Debug.Print "Monitor Bottom : " & .Bottom
End With
With .rcWork
Debug.Print "Work area Left : " & .Left
Debug.Print "Work area Top : " & .Top
Debug.Print "Work area Right : " & .Right
Debug.Print "Work area Bottom : " & .Bottom
End With
End With
Debug.Print
Debug.Print
End Sub
Public Function FunctionExist(ByVal strModule As String, ByVal strFunction As String) As Boolean
Dim hHandle As Long
hHandle = GetModuleHandle(strModule)
If hHandle = &H0 Then
Failed "GetModuleHandle"
hHandle = LoadLibraryEx(strModule, &H0, &H0): If hHandle = &H0 Then Failed "LoadLibrary"
If GetProcAddress(hHandle, strFunction) = &H0 Then
Failed "GetProcAddress"
Else
FunctionExist = True
End If
If FreeLibrary(hHandle) = False Then Failed "FreeLibrary"
Else
If GetProcAddress(hHandle, strFunction) = &H0 Then
Failed "GetProcAddress"
Else
FunctionExist = True
End If
End If
End Function
Public Sub Failed(ByVal strFunction As String)
If errMsg = True Then
If Err.LastDllError = 0 Then
MessageBoxEx &H0, strFunction & Chr$(13) & Chr$(10) &
Chr$(13) & Chr$(10) & "Failed", "Error", MB_OK Or MB_ICONWARNING
Or MB_SETFOREGROUND, 0
Else
Errors Err.LastDllError, strFunction
End If
End If
End Sub
Public Function MonitorEnumProc(ByVal hMonitor As Long, ByVal
hdcMonitor As Long, ByRef lprcMonitor As RECT, ByVal dwData As Long) As
Boolean
Dim ub As Integer
ub = 0
On Error Resume Next
ub = UBound(MonitorId)
On Error GoTo 0
ReDim Preserve MonitorId(ub + 1)
MonitorId(UBound(MonitorId)) = CStr(hMonitor)
MonitorEnumProc = 1
End Function
' ---------------------------------------------------
' Below I have pasted the results of the test
' subroutine on my system.
' ---------------------------------------------------
' Number of monitors in this system : 2
' Monitor info for device number : 65539
' ---------------------------------------------------
' Device Name :
\\.\DISPLAY1
' Primary Display = False
' Monitor Left : 1280
' Monitor Top : 0
' Monitor Right : 2560
' Monitor Bottom : 1024
' Work area Left : 1280
' Work area Top : 0
' Work area Right : 2560
' Work area Bottom : 1024
' Monitor info for device number : 65537
' ---------------------------------------------------
' Device Name :
\\.\DISPLAY2
' Primary Display = True
' Monitor Left : 0
' Monitor Top : 0
' Monitor Right : 1280
' Monitor Bottom : 1024
' Work area Left : 0
' Work area Top : 0
' Work area Right : 1280
' Work area Bottom : 996
