用VB5制作家庭影集 冯雪瑜 李忠东 2000年 第2期   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