private Const CCDEVICENAME As Short = 32
private Const CCFORMNAME As Short = 32
private Const DM_PELSWIDTH As Integer = &H80000
private Const DM_PELSHEIGHT As Integer = &H100000
'刷新頻率常量
private Const DM_DISPLAYFREQUENCY As Integer = &H400000
'調用API函數
private Declare Function EnumDisplaySettings Lib "user32" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As Integer, ByVal iModeNum As Integer, ByRef lpDevMode As DEVMODE) As Boolean
'調用api函數
private Declare Function ChangeDisplaySettings Lib "user32" Alias "ChangeDisplaySettingsA" (ByRef lpDevMode As DEVMODE, ByVal dwflags As Integer) As Integer
'定義結構
private Structure DEVMODE
Public dmDeviceName As String
dim dmSpecVersion As Short
dim dmDriverVersion As Short
dim dmSize As Short
dim dmDriverExtra As Short
dim dmFields As Integer
dim dmOrientation As Short
dim dmPaperSize As Short
dim dmPaperLength As Short
dim dmPaperWidth As Short
dim dmScale As Short
dim dmCopies As Short
dim dmDefaultSource As Short
dim dmPrintQuality As Short
dim dmColor As Short
dim dmDuplex As Short
dim dmYResolution As Short
dim dmTTOption As Short
dim dmCollate As Short
Public dmFormName As String
dim dmUnusedPadding As Short
dim dmBitsPerPel As Short
dim dmPelsWidth As Integer
dim dmPelsHeight As Integer
dim dmDisplayFlags As Integer
dim dmDisplayFrequency As Integer
end Structure
'改變分辯率過程,參數一寬度,參數二高度
private Sub ChangeDisp(ByRef iWidth As Single, ByRef iHeight As Single)
dim blnWorked As Boolean
dim i As Integer
dim DevM As Form1.DEVMODE
i = 0
do
blnworked = EnumDisplaySettings(0, i, DevM)
i = i + 1
loop Until (blnWorked = False)
with DevM
.dmfields = DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_DISPLAYFREQUENCY
.dmpelswidth = iWidth
.dmpelsheight = iHeight
'刷新頻率爲85
.dmdisplayfrequency = 85
end With
call ChangeDisplaySettings(DevM, 0)
end Sub
private Sub btnGetDisp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetDisp.Click
dim X As Short = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width
dim Y As Short = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height
msgbox("您的顯示器分辨率是" & X & " X " & Y)
end Sub
private Sub btnSetDisp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSetDisp.Click
if MsgBox("您確認要將顯示器分辨率改爲1024x768嗎?", MsgBoxStyle.OKCancel, "系統消息") = MsgBoxResult.OK Then
'調用改變分辯率過程
changedisp(1024, 768)
end If
end Sub |