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كود :

Class ResolutionChanger
 Public Enum ChangeResult
   Success
   Restart
   Fail
   ResolutionNotSupported
 End Enum

 Public Function SetResolution(ByVal Width As UInteger, ByVal Height As UInteger) As ChangeResult
   Dim DevMode As New DEVMODEA
   If User_32.EnumDisplaySettingsA(Screen.PrimaryScreen.DeviceName, ENUM_CURRENT_SETTINGS, DevMode) Then
     DevMode.dmPelsWidth = Width
     DevMode.dmPelsHeight = Height
     Dim ReturnValue = User_32.ChangeDisplaySettingsA(DevMode, CDS_TEST)
     If ReturnValue = DISP_CHANGE_FAILED Then
       'The Requested resolution is not supported by the system
       Return ChangeResult.ResolutionNotSupported
     Else
       ReturnValue = User_32.ChangeDisplaySettingsA(DevMode, CDS_UPDATEREGISTRY)
       Select Case ReturnValue
         Case DISP_CHANGE_RESTART
           'The resolution cannot be change dynamically on every system
           'Windows 9x and some Laptop (XP,Vista,Windows7) have to reboot.
           Return ChangeResult.Restart
         Case DISP_CHANGE_SUCCESSFUL
           'Resolution was changed
           'This is not an assurance that the new resolution will render
           'proprely on every system. It only means that the registery was
           'updated succesfuly and that the driver have not return any
           'error
           Return ChangeResult.Success
         Case Else
           'An error has caused the resolution not to be changed
           Return ChangeResult.Fail
       End Select
     End If
   End If
 End Function
 '
 '============Region Interop ==============================================
 '
 '
 Private Const ENUM_CURRENT_SETTINGS As Integer = -1
 Private Const CDS_UPDATEREGISTRY As Integer = 1
 Private Const CDS_TEST As Integer = 2
 Private Const DISP_CHANGE_SUCCESSFUL As Integer = 0
 Private Const DISP_CHANGE_RESTART As Integer = 1
 Private Const DISP_CHANGE_FAILED As Integer = -1

 <System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)> _
 Public Structure DEVMODEA
   'BYTE[32]
   <System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=32, ArraySubType:=System.Runtime.InteropServices.UnmanagedType.I1)> _
   Public dmDeviceName() As Byte
   Public dmSpecVersion As UShort
   Public dmDriverVersion As UShort
   Public dmSize As UShort
   Public dmDriverExtra As UShort
   Public dmFields As UInteger
   Public Union1 As Anonymous_2338c0fc_03a3_4514_b536_fb9bb5df14c5
   Public dmColor As Short
   Public dmDuplex As Short
   Public dmYResolution As Short
   Public dmTTOption As Short
   Public dmCollate As Short
   <System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=32, ArraySubType:=System.Runtime.InteropServices.UnmanagedType.I1)> _
   Public dmFormName() As Byte
   Public dmLogPixels As UShort
   Public dmBitsPerPel As UInteger
   Public dmPelsWidth As UInteger
   Public dmPelsHeight As UInteger
   Public Union2 As Anonymous_7557e508_845c_4777_b9f2_a1496c1c7b21
   Public dmDisplayFrequency As UInteger
   Public dmICMMethod As UInteger
   Public dmICMIntent As UInteger
   Public dmMediaType As UInteger
   Public dmDitherType As UInteger
   Public dmReserved1 As UInteger
   Public dmReserved2 As UInteger
   Public dmPanningWidth As UInteger
   Public dmPanningHeight As UInteger
 End Structure

 <System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Explicit)> _
 Public Structure Anonymous_2338c0fc_03a3_4514_b536_fb9bb5df14c5
   <System.Runtime.InteropServices.FieldOffsetAttribute(0)> _
   Public Struct1 As Anonymous_a67d541d_da92_408e_8852_89977e56cead
   <System.Runtime.InteropServices.FieldOffsetAttribute(0)> _
   Public Struct2 As Anonymous_d973d7e7_ad4c_4155_86fe_6d2b51ab5f04
 End Structure

 <System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Explicit)> _
 Public Structure Anonymous_7557e508_845c_4777_b9f2_a1496c1c7b21
   <System.Runtime.InteropServices.FieldOffsetAttribute(0)> _
   Public dmDisplayFlags As UInteger
   <System.Runtime.InteropServices.FieldOffsetAttribute(0)> _
   Public dmNup As UInteger
 End Structure

 <System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)> _
 Public Structure Anonymous_a67d541d_da92_408e_8852_89977e56cead
   Public dmOrientation As Short
   Public dmPaperSize As Short
   Public dmPaperLength As Short
   Public dmPaperWidth As Short
   Public dmScale As Short
   Public dmCopies As Short
   Public dmDefaultSource As Short
   Public dmPrintQuality As Short
 End Structure

 <System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)> _
 Public Structure Anonymous_d973d7e7_ad4c_4155_86fe_6d2b51ab5f04
   Public dmPosition As POINTL
   Public dmDisplayOrientation As UInteger
   Public dmDisplayFixedOutput As UInteger
 End Structure

 <System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)> _
 Public Structure POINTL
   Public x As Integer
   Public y As Integer
 End Structure

 Partial Public Class User_32
   <System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint:="EnumDisplaySettingsA")> _
   Public Shared Function EnumDisplaySettingsA(<System.Runtime.InteropServices.InAttribute(), System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)> ByVal lpszDeviceName As String, ByVal iModeNum As Integer, <System.Runtime.InteropServices.OutAttribute()> ByRef lpDevMode As DEVMODEA) As <System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)> Boolean
   End Function

   <System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint:="ChangeDisplaySettingsA")> _
   Public Shared Function ChangeDisplaySettingsA(<System.Runtime.InteropServices.OutAttribute()> ByRef lpDevMode As DEVMODEA, ByVal dwFlags As UInteger) As Integer
   End Function
 End Class

End Class

طريقة الاستخدام :

كود :

Public Class Form1

 Private Resolution As New ResolutionChanger
 Private OldWidth As UInteger
 Private OldHeight As UInteger
 

 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
   OldHeight = CUInt(Screen.PrimaryScreen.Bounds.Height)
   OldWidth = CUInt(Screen.PrimaryScreen.Bounds.Width)
   Select Case Resolution.SetResolution(800, 600)
     Case ResolutionChanger.ChangeResult.Success
       MsgBox("The Resolution was changed", MsgBoxStyle.OkOnly)
     Case ResolutionChanger.ChangeResult.Restart
       MsgBox("Restart your system to activate the new resolution setting", MsgBoxStyle.OkOnly)
     Case ResolutionChanger.ChangeResult.Fail
       MsgBox("The resolution couldn't be changed", MsgBoxStyle.OkOnly)
     Case ResolutionChanger.ChangeResult.ResolutionNotSupported
       MsgBox("The requested resolution is not supported by your system", MsgBoxStyle.OkOnly)
   End Select
 End Sub

End Class