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你想拥有自己的电子家庭影集吗？其实用VB就能实现。方法如下：
准备：家庭普通照片经扫描后储存。
构想：照片一张接一张出现在屏幕中间，出现时的方式采取动态切换，上方一行标题从左向右移过，标题与照片的背景色随机变化。
关键：调用Bitblt Windows API函数实现照片的动态切换。
内容：工程由Form1和modlue1构成。
Form1中的内容如下：
Const bmpfilemax = 11 ′照片数目常量
Dim bmpfile(bmpfilemax) As String ′照片的文件组
Dim drawbmpmode(bmpfilemax) As Integer '照片的切换方式
Dim bmpnum, movestep, xmax, ymax, endmax, lleft, r, n As Integer ′照片的序号、步进参数等
Dim kxy As Single ′x、y方向的比例
Private Sub Exit_Click()
End
End Sub
Private Sub Form_Load()
Label1.Left = 0
Label1.Caption = ″Family Album″
Picture1.AutoSize = True
Picture1.Visible = False
bmpfile(0) = App.Path ＋ ″ \son1.jpg″
bmpfile(1) = App.Path ＋ ″\mom_son1.jpg″
bmpfile(2) = App.Path ＋ ″\daddy－son.jpg″
bmpfile(3) = App.Path ＋ ″\yu99yantai.jpg″
bmpfile(4) = App.Path ＋ ″\yu98singap2.jpg″
bmpfile(5) = App.Path ＋ ″\yu98singapore.jpg″
bmpfile(6) = App.Path ＋ ″\mom_son2.jpg″
bmpfile(7) = App.Path ＋ ″\yu99yan2.jpg″
bmpfile(8) = App.Path ＋ ″\family.jpg″
bmpfile(9) = App.Path ＋ ″\fan－yantai.jpg″
bmpfile(10) = App.Path ＋ ″\yu99yan3.jpg″
drawbmpmode(bmpnum) = 1 ＋ Int(Rnd() ＊ 4)
movestep = 0 ′步进参数
xmax = Form1.ScaleWidth ／
ymax = Form1.ScaleHeight ／
kxy = ymax ／ xmax
Picture1.Picture = LoadPicture(bmpfile(bmpnum))
Timer1.Interval = 30
End Sub
Private Sub Timer1_Timer()
m = Form1.ScaleWidth ／ － Picture1.Width ／ ′照片显示结束时的X方向居中定位
n = Form1.ScaleHeight ／ － Picture1.Height ／ ′照片显示结束时的Y方向居中定位
hDestDC = Form1.hDC
hSrcDC = Picture1.hDC
drawflag = drawbmpmode(bmpnum) ′照片显示时的切换方式
Select Case drawflag
Case 1 ′切换方式为从左右向中间进行
Timer1.Interval = 30
endmax = xmax
w = movestep
h = Picture1.Height
i = BitBlt(hDestDC, 0 ＋ m, 0 ＋ n, w, h, hSrcDC, 0, 0, SRCCOPY)
X1 = Picture1.Width － movestep
i = BitBlt(hDestDC, X1 ＋ m, 0 ＋ n, w, h, hSrcDC, X1, 0, SRCCOPY)
Case 2 ′切换方式为从中间向四周扩散进行
Timer1.Interval = 30
endmax = xmax
X1 = xmax － movestep
w = movestep ＊ 2
Y1 = CInt(ymax － movestep ＊ kxy)
h = CInt(2 ＊ movestep)
i = BitBlt(hDestDC, X1 ＋ m, Y1 ＋ n, w, h, hSrcDC, X1, Y1, SRCCOPY)
Case 3 ′切换方式为栅栏翻转进行
Timer1.Interval = 200
ednmax = CInt(2 ＊ xmax ／ 10)
tempi = CInt(2 ＊ xmax ／ 10)
w = movestep
h = Picture1.ScaleHeight
For ij = 0 To 9
i = BitBlt(hDestDC, tempi ＊ ij ＋ m, 0 ＋ n, w, h, hSrcDC, tempi ＊ ij, 0,
SRCCOPY)
Next ij
Case 4 ′切换方式为从左向右进行
Timer1.Interval = 30
endmax = xmax
w = movestep ＊ 2
h = Form1.ScaleHeight
i = BitBlt(hDestDC, 0 ＋ m, 0 ＋ n, w, h, hSrcDC, X1, Y1, SRCCOPY)
End Select
Form1.Refresh
movestep = movestep ＋ 4
Label1.Left = movestep
If movestep > endmax ＋ 60 Then
bmpnum = bmpnum ＋ 1
If bmpnum >= bmpfilemax Then
bmpnum = 0
End If
Cls
movestep = 0
Picture1.Picture = LoadPicture(bmpfile(bmpnum))
drawbmpmode(bmpnum) = 1 ＋ Int(Rnd() ＊ 4)
BackColor = QBColor(Rnd ＊ 15)
Label1.ForeColor = QBColor(Rnd ＊ 10)
If BackColor = Label1.ForeColor Then
Label1.ForeColor = vbBlack
End If
Label1.Caption = ″Family Album″
Label1.Top = Picture1.Top
End If
End Sub
Modlue1中的内容如下：
Option Explicit
Public Const SRCCOPY = ＆HCC0020 ' (DWORD) dest = source
Declare Function BitBlt Lib ″gdi32″ (ByVal hDestDC As _
Long, ByVal x As Long, ByVal Y As Long, ByVal nWidth _
As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, _
ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
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