我想学习一个代码，但是出问题，请大家指点一下
以下是很早的有关directx的开发例子，代码如下，但是运行出现错误，提示：编译错误，找不到工程或库，大家自己拷贝代码之后运行一下看看，vb6的，请高手指点一下我应该如何处理？
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' DirectDraw Starfield Sample, Copyright Patrice Scribe, 1997
Option Compare Text
Option Explicit
Private Declare Function SetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal crColor As Long) As Long
Private Declare Function ShowCursor Lib "user32" (ByVal bShow As Long) As Long
Const NumberOfStars = 400 ' Number of stars
Const ResolutionX = 320 ' Width for the display mode
Const ResolutionY = 200 ' Height for the display mode
Dim dd As DirectDraw2 ' DirectDraw object //////////////////////就这里开始出现错误了！！！
Dim ddsdFront As DDSURFACEDESC ' Front surface description
Dim ddsFront As DirectDrawSurface2 ' Front buffer
Dim ddsBack As DirectDrawSurface2 ' Back buffer
Dim ddCaps As DDSCAPS ' Capabilities for search
Dim lhdc As Long ' hDC for back buffer
Dim i As Long
Dim fx As DDBLTFX
Dim blnEnd As Boolean
Private Type TStar
x As Single ' x !
y As Single ' y !
Color As Byte ' Color (intensity)
End Type
Dim aStars(1 To NumberOfStars) As TStar
Private Sub Form_Load()
' Initial stars
Dim i As Long
For i = 1 To NumberOfStars
With aStars(i)
.x = Rnd * ResolutionX \ 2 - ResolutionX \ 4
.y = Rnd * ResolutionY \ 2 - ResolutionY \ 4
.Color = Rnd * 20 + 50
End With
Next
' Create the DirectDraw object
DirectDrawCreate ByVal 0&, dd, Nothing
' This app is full screen and will change the display mode
dd.SetCooperativeLevel Me.hWnd, DDSCL_EXCLUSIVE Or DDSCL_FULLSCREEN
' Set the display mode
dd.SetDisplayMode ResolutionX, ResolutionY, 8, 0, 0
' Fill front buffer description structure...
With ddsdFront
' Structure size
.dwSize = Len(ddsdFront)
' Use DDSD_CAPS and BackBufferCount
.dwFlags = DDSD_CAPS Or DDSD_BACKBUFFERCOUNT
' Primary, flipable surface
.DDSCAPS.dwCaps = DDSCAPS_PRIMARYSURFACE Or DDSCAPS_FLIP Or DDSCAPS_COMPLEX Or DDSCAPS_SYSTEMMEMORY
' One back buffer (you can try 2)
.dwBackBufferCount = 1
End With
' Create front buffer
dd.CreateSurface ddsdFront, ddsFront, Nothing
' Retrieve the back buffer object
ddCaps.dwCaps = DDSCAPS_BACKBUFFER
ddsFront.GetAttachedSurface ddCaps, ddsBack
'Render loop
While Not blnEnd
DrawNextFrame
DoEvents
Wend
Unload Me
End Sub
' Draw next frame
Private Sub DrawNextFrame()
Dim t As RECT
On Error Resume Next
' Clear the back buffer
With fx
.dwSize = Len(fx)
.dwFillColor = RGB(0, 0, 0)
End With
t.Top = 0
t.Left = 0
t.bottom = ResolutionY
t.Right = ResolutionX
ddsBack.Blt t, Nothing, t, DDBLT_COLORFILL, fx
' Plot the stars (get and release the backbuffer DC)
ddsBack.GetDC lhdc
If Err = 0 Then
For i = 1 To NumberOfStars
With aStars(i)
SetPixel lhdc, ResolutionX \ 2 + .x, ResolutionY \ 2 + .y, RGB(.Color, .Color, .Color)
End With
Next
ddsBack.ReleaseDC lhdc
End If
' Flip the buffers
Do
ddsFront.Flip Nothing, 0
If Err = DDERR_SURFACELOST Then ddsFront.Restore
Loop Until Err = 0
' Prepare the stars for the next frame
For i = 1 To NumberOfStars
With aStars(i)
.x = .x * 1.2
.y = .y * 1.2
.Color = .Color * 1.2
If Abs(.x) > ResolutionX \ 2 Or Abs(.y) > ResolutionY \ 2 Then
.x = Rnd * ResolutionX \ 2 - ResolutionX \ 4
.y = Rnd * ResolutionY \ 2 - ResolutionY \ 4
.Color = Rnd * 20 + 50
End If
End With
Next
Exit Sub
'DrawNextFrame_Error:
' ' If surface lost, try to restore it
' If Err = DDERR_SURFACELOST Then
' ddsFront.Restore
' Resume
' End If
' ' If still drawing, try again
' If Err = DDERR_WASSTILLDRAWING Then
' Resume
' End If
' Resume Next
End Sub
' Unload the form
Private Sub Form_KeyPress(KeyAscii As Integer)
blnEnd = True
End Sub
' Release DirectDraw objects
Private Sub Form_Unload(Cancel As Integer)
dd.FlipToGDISurface
dd.RestoreDisplayMode
dd.SetCooperativeLevel 0, DDSCL_NORMAL
Set ddsBack = Nothing
Set ddsFront = Nothing
Set dd = Nothing
ShowCursor 1
End Sub
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[解决办法]
要先安装好对应的DirectX和Direct SDK。
[解决办法]
Direct7以后的版本似乎不在为VB6提供接口。
[解决办法]
