大家知道,在许多Windows软件的安装程序中,时常可以看到以某种颜色由浅至深的渐变为背景的窗口。使用VB制作这类窗口的方法有不少,而通过调用API函数绘制渐变的窗口背景色,似乎是一种既简单又节省资源的方法。   首先,在module文件中加入下列声明语句:   Declare Function CreateSolidBrush Lib"GDI"(ByVal crColor As Long) As Integer   Declare Function FillRect Lib"USER"(ByVal hDC As Integer,lpRect As RECT,ByVal hBrush As Integer)As Integer   Declare Function DeleteObject Lib"GDI"(ByVal hObject As Integer)As Integer   Type RECT   left As Integer    top As Integer    right As Integer    bottom As Integer   EndType   然后,在窗口的Paint事件中加入下列代码:   Private Sub Form_Paint()   Dim Color As Integer   Dim hBrush As Integer   Dim OldMode As Integer   Dim RetVal As Integer   Dim StepSize As Integer   Dim X As Integer   Dim FillArea As RECT   OldMode%=Me.ScaleMode   Me.ScaleMode=3   StepSize%=1+Me.ScaleHeight/80   Color%=255   FillArea.left=0   FillArea.right=Me.ScaleWidth   FillArea.top=0   FillArea.bottom=StepSize%   For X%=1 To 80   hBrush%=CreateSolidBrush (RGB(0,0,Color%))    RetVal%=FillRect(Me.hDC,FillArea,hBrush%)    RetVal%=DeleteObject(hBrush%)   Color%=Color%-4    If Color% <0 Then Color%="0    FillArea.top=FillArea.bottom   FillArea.bottom=FillArea.bottom+StepSize%   Next   Me.ScaleMode=OldMode%   EndSub   按F5运行,就会出现一个以从上至下、由浅至深的渐变蓝色为背景的窗口。对上述代码稍加改动,便可制作出各种颜色和水平方向的渐变背景。