<!--StartFragment-->在VB中利用Windows的API函数可以实现很多的VB无法实现的扩展功能，下面的程序介绍的是如何通过调用Windows中的API函数实现文本旋转显示的特级效果。 首先建立一个工程文件，然后选菜单中的Project | Add Class Module 加入一个新的类文件，并将这个类的Name属性改变为APIFont，然后在类的代码窗口中加入以下的代码： Option Explicit
Private Declare Function SelectClipRgn Lib “gdi32”(ByVal hdc As Long, ByVal hRgn As _ Long) As Long Private Declare Function CreateRectRgn Lib “gdi32”(ByVal X1 As Long, ByVal Y1 As _ Long, ByVal X2 As Long, ByVal Y2 As Long) As Long Private Declare Function SetTextColor Lib “gdi32”(ByVal hdc As Long, ByVal crColor As _ Long) As Long Private Declare Function DeleteObject Lib “gdi32”(ByVal hObject As Long) As Long Private Declare Function CreateFontIndirect Lib “gdi32” Alias “CreateFontIndirectA” _ (lpLogFont As LOGFONT) As Long Private Declare Function SelectObject Lib “gdi32”(ByVal hdc As Long, ByVal hObject As _ Long) As Long Private Declare Function TextOut Lib “gdi32” Alias “TextOutA” (ByVal hdc As Long, _ ByVal X As Long, ByVal Y As Long, ByVal lpString As String, ByVal nCount As _ Long) As Long Private Declare Function SetTextAlign Lib “gdi32”(ByVal hdc As Long, ByVal wFlags _ As Long) As Long
Private Type RECT Left As Long Top As Long Right As Long Bottom As Long End Type
Private Type LOGFONT lfHeight As Long lfWidth As Long lfEscapement As Long lfOrientation As Long lfWeight As Long lfItalic As Byte lfUnderline As Byte lfStrikeOut As Byte lfCharSet As Byte lfOutPrecision As Byte lfClipPrecision As Byte lfQuality As Byte lfPitchAndFamily As Byte lfFaceName As String ＊ 50 End Type
Private m_LF As LOGFONT Private NewFont As Long Private OrgFont As Long Public Sub CharPlace(o As Object, txt＄, X, Y) Dim Throw As Long Dim hregion As Long Dim R As RECT
R.Left = X R.Right = X ＋ o.TextWidth(txt＄) ＊ 2 R.Top = Y R.Bottom = Y ＋ o.TextHeight(txt＄) ＊ 2
hregion = CreateRectRgn(R.Left, R.Top, R.Right, R.Bottom) Throw = SelectClipRgn(o.hdc, hregion) Throw = TextOut(o.hdc, X, Y, txt＄, Len(txt＄)) DeleteObject (hregion) End Sub Public Sub SetAlign(o As Object, Top, BaseLine, Bottom, Left, Center, Right) Dim Vert As Long Dim Horz As Long
If Top = True Then Vert = TA_TOP If BaseLine = True Then Vert = TA_BASELINE If Bottom = True Then Vert = TA_BOTTOM If Left = True Then Horz = TA_LEFT If Center = True Then Horz = TA_CENTER If Right = True Then Horz = TA_RIGHT SetTextAlign o.hdc, Vert Or Horz End Sub Public Sub setcolor(o As Object, CValue As Long) Dim Throw As Long
Throw = SetTextColor(o.hdc, CValue) End Sub Public Sub SelectOrg(o As Object) Dim Throw As Long
NewFont = SelectObject(o.hdc, OrgFont) Throw = DeleteObject(NewFont) End Sub Public Sub SelectFont(o As Object) NewFont = CreateFontIndirect(m_LF) OrgFont = SelectObject(o.hdc, NewFont) End Sub Public Sub FontOut(text＄, o As Control, XX, YY) Dim Throw As Long
Throw = TextOut(o.hdc, XX, YY, text＄, Len(text＄)) End Sub
Public Property Get Width() As Long Width = m_LF.lfWidth End Property
Public Property Let Width(ByVal W As Long) m_LF.lfWidth = W End Property
Public Property Get Height() As Long Height = m_LF.lfHeight End Property
Public Property Let Height(ByVal vNewValue As Long) m_LF.lfHeight = vNewValue End Property
Public Property Get Escapement() As Long Escapement = m_LF.lfEscapement End Property
Public Property Let Escapement(ByVal vNewValue As Long) m_LF.lfEscapement = vNewValue End Property
Public Property Get Weight() As Long Weight = m_LF.lfWeight End Property
Public Property Let Weight(ByVal vNewValue As Long) m_LF.lfWeight = vNewValue End Property
Public Property Get Italic() As Byte Italic = m_LF.lfItalic End Property
Public Property Let Italic(ByVal vNewValue As Byte) m_LF.lfItalic = vNewValue End Property
Public Property Get UnderLine() As Byte UnderLine = m_LF.lfUnderline End Property
Public Property Let UnderLine(ByVal vNewValue As Byte) m_LF.lfUnderline = vNewValue End Property
Public Property Get StrikeOut() As Byte StrikeOut = m_LF.lfStrikeOut End Property
Public Property Let StrikeOut(ByVal vNewValue As Byte) m_LF.lfStrikeOut = vNewValue End Property
Public Property Get FaceName() As String FaceName = m_LF.lfFaceName End Property
Public Property Let FaceName(ByVal vNewValue As String) m_LF.lfFaceName = vNewValue End Property
Set AF = Nothing Set AF = New APIFont Picture2.Cls For i = 0 To 3600 Step 360 AF.Escapement = i AF.SelectFont Picture2 X = Picture2.ScaleWidth / 2 Y = Picture2.ScaleHeight / 2 ''''在字符串后面要加入7个空格 AF.FontOut “电脑商情报第42期 ”, Picture2, X, Y AF.SelectOrg Picture2 Next i End Sub
Private Sub Form_Load() Picture2.ScaleMode = 3 End Sub
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