'设定显示模式位640×480×8位颜色
DDraw.SetDisplayMode 640, 480, 8, 0, DDSDM_DEFAULT
'设定DDSFrontDesc为主平面
With DDSFrontDesc
.lFlags = DDSD_CAPS
.ddsCaps.lCaps = DDSCAPS_PRIMARYSURFACE 'Or DDSCAPS_SYSTEMMEMORY
End With
'设定DDSBackDesc为后台缓冲平面
With DDSBackDesc
.ddsCaps.lCaps = DDSCAPS_SYSTEMMEMORY
.lFlags = DDSD_CAPS Or DDSD_WIDTH Or DDSD_HEIGHT
.lWidth = 640
.lHeight = 480
End With
'建立平面
Set DDSFront = DDraw.CreateSurface(DDSFrontDesc)
Set DDSBack = DDraw.CreateSurface(DDSBackDesc)
Set Clipper = DDraw.CreateClipper(0)
Clipper.SetHWnd MainForm.hWnd
DDSFront.SetClipper Clipper
DDSBack.SetClipper Clipper
DoEvents
Exit Sub
ERRoUT:
If Not (DDraw Is Nothing) Then
DDraw.RestoreDisplayMode
DDraw.SetCooperativeLevel MainForm.hWnd, DDSCL_NORMAL
DoEvents
End If
MsgBox “无法对DirectDraw进行初始化 ”＋Chr(13)＋“也许你的显示卡不支持 640×480×8 显示模式 ”
End
End Sub
Public Sub TerminateDX()
'子程序TerminateDX回复原来的显示模式并且释放所有的DirectDraw有关对象
DDraw.RestoreDisplayMode
DDraw.SetCooperativeLevel MainForm.hWnd, DDSCL_NORMAL
DoEvents
Set Clipper = Nothing
Set DDSBack = Nothing
Set DDSFront = Nothing
Set DDraw = Nothing
Set DX = Nothing
End Sub
在工程文件中再加入一个Module，这个Module主要定义与图像保存相关的操作，在建立的Module中加入以下代码：
Option Explicit
Option Base 0
Private Type PALETTEENTRY
peRed As Byte
peGreen As Byte
peBlue As Byte
peFlags As Byte
End Type
Private Type LOGPALETTE
palVersion As Integer
palNumEntries As Integer
palPalEntry(255) As PALETTEENTRY
End Type
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type
Private Const RASTERCAPS As Long = 38
Private Const RC_PALETTE As Long = ＆H100
Private Const SIZEPALETTE As Long = 104
Private Declare Function CreateCompatibleDC Lib “GDI32” (ByVal hDC As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib “GDI32” (ByVal hDC As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function GetDeviceCaps Lib “GDI32” (ByVal hDC As Long, ByVal iCapabilitiy As Long) As Long
Private Declare Function GetSystemPaletteEntries Lib “GDI32” (ByVal hDC As Long, ByVal wStartIndex As Long, ByVal wNumEntries As Long, lpPaletteEntries As PALETTEENTRY) As Long
Private Declare Function CreatePalette Lib “GDI32”(lpLogPalette As LOGPALETTE) As Long
Private Declare Function SelectObject Lib “GDI32”(ByVal hDC As Long, ByVal hObject As Long) As Long
Private Declare Function BitBlt Lib “GDI32”(ByVal hDCDest As Long, ByVal XDest As Long, ByVal YDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hdcSrc As Long, ByVal XSrc As Long, ByVal YSrc As Long, ByVal dwRop As Long) As Long
Private Declare Function DeleteDC Lib “GDI32”(ByVal hDC As Long) As Long
Private Declare Function GetForegroundWindow Lib “USER32” () As Long
Private Declare Function SelectPalette Lib “GDI32”(ByVal hDC As Long, ByVal hPalette As Long, ByVal bForceBackground As Long) As Long
Private Declare Function RealizePalette Lib “GDI32” (ByVal hDC As Long) As Long
Private Declare Function GetWindowDC Lib “USER32” (ByVal hWnd As Long) As Long
Private Declare Function GetDC Lib “USER32"(ByVal hWnd As Long) As Long
Private Declare Function GetWindowRect Lib “USER32”(ByVal hWnd As Long, lpRect As RECT) As Long
Private Declare Function ReleaseDC Lib “USER32”(ByVal hWnd As Long, ByVal hDC As Long) As Long
Private Declare Function GetDesktopWindow Lib “{USER32"() As Long
Private Type PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type
Private Declare Function OleCreatePictureIndirect Lib “olepro32.dll” (PicDesc As PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPicture) As Long
Public Function SaveTohBmp(ByVal hdcSrc As Long, ByVal LeftSrc As Long, _
ByVal TopSrc As Long, ByVal WidthSrc As Long, ByVal HeightSrc As Long) As Picture
Dim hDCMemory As Long
Dim hBmp As Long
Dim hBmpPrev As Long
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