在VB中改变显示器的分辨率.docx

在VB中改变显示器的分辨率 重庆邮电学院 徐原 请作者提供详细的邮政地址给我们 - 有一些游戏如Delta Force可以让玩家在玩游戏时改变显示器的分辨率，现在介绍一种在VB中实现的方法。 - 这里要用到一个在VB的API浏览器中没有的函数，声明如下： - Private Declare Function ChangeDisplaySettings Lib user32 Alias_ ChangeDisplaySettingsA (ByVal lpDevMode As Long, ByVal dwflags As Long) As Long - 第一个参数指向一个DEVMODE结构,第二个参数为一些标志，这些标志有： 标志 含义0 当前屏幕的图形模式将被动态地改变CDS_UPDATEREGISTRY 当前屏幕的图形模式将被动态地改变并且注册表里的屏幕分辨率的值也_ 被更新（注册表中保存有屏幕的分辨率及相关属性，以便以后开机或重_ 起时加载）,在USER文件中也保存该模式CDS_TEST 仅供系统测试，看这种图形模式是否能够正常CDS_FULLSCREEN 临时改变 Windows NT: 如果切换到另外的桌面，该模式不会被保存CDS_GLOBAL该设置将被保存在全局设置区内，对所有用户都起作用CDS_SET_PRIMARY 设置该设备为私有设备，这里对屏幕对象不起作用CDS_RESET 恢复以前的设置声明：Private Declare Function lstrcpy Lib kernel32 Alias lstrcpyA (lpString1 As_Any, lpString2 As Any) As LongPrivate Declare Function ChangeDisplaySettings Lib user32 Alias_ ChangeDisplaySettingsA (ByVal lpDevMode As Long, ByVal dwflags As Long) As LongPrivate Const CCHDEVICENAME = 32Private Const CCHFORMNAME = 32Private Type DEVMODE详细参考MSDN dmDeviceName As String * CCHDEVICENAME dmSpecVersion As Integer dmDriverVersion As Integer dmSize As Integer dmDriverExtra As Integer dmFields As Long dmOrientation As Integer dmPaperSize As Integer dmPaperLength As Integer dmPaperWidth As Integer dmScale As Integer dmCopies As Integer dmDefaultSource As Integer dmPrintQuality As Integer dmColor As Integer dmDuplex As Integer dmYResolution As Integer dmTTOption As Integer dmCollate As Integer dmFormName As String * CCHFORMNAME dmUnusedPadding As Integer dmBitsPerPel As Integer dmPelsWidth As Long dmPelsHeight As Long dmDisplayFlags As Long dmDisplayFrequency As LongEnd TypePublic Function SetScreen(Width As Integer, Height As Integer, Optional Color As Integer = 16) As Long这里的16指的是真16色Const DM_PELSWIDTH = &H80000Const DM_PELSHEIGHT = &H100000Const DM_BITSPERPEL = &H40000Dim NewDevMode As DEVMODEDim pDevmode As LongWith NewDevMode.dmSize = Len(NewDevMode)一般为122If Color = -1 Then.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT Else .dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_BITSPERPEL End If .dmPelsWidth = Width .dmPelsHeight = Height If Color -1 Then .dmBitsPerPel = Color End IfEnd WithpDevmode = lstrcpy(NewDevMode, NewDevMode)SetDisplayMode = ChangeDisplaySettings(pDevmode, 0)End Function Private Sub Change_Click()SetScreen Val(Text1), Val(Text2), Val(Text3)End Sub下面三个文本框分别存放分辨率和颜色值Private Sub Text1_GotFocus()Text1.SelStart = 0Text1.SelLength = Len(Text1)End SubPrivate Sub Text2_GotFocus()Text2.SelStart = 0Text2.S