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 Const TA_LEFT = 0
　　 Private Const TA_RIGHT = 2
　　 Private Const TA_CENTER = 6
　　 Private Const TA_TOP = 0
　　 Private Const TA_BOTTOM = 8
　　 Private Const TA_BASELINE = 24

　　 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

　　 Private Sub Class_Initialize()
　　 m_LF.lfHeight = 30
　　 m_LF.lfWidth = 10
　　 m_LF.lfEscapement = 0
　　 m_LF.lfWeight = 400
　　 m_LF.lfItalic = 0
　　 m_LF.lfUnderline = 0
　　 m_LF.lfStrikeOut = 0
　　 m_LF.lfOutPrecision = 0
　　 m_LF.lfClipPrecision = 0
　　 m_LF.lfQuality = 0
　　 m_LF.lfPitchAndFamily = 0
　　 m_LF.lfCharSet = 0
　　 m_LF.lfFaceName = "Arial" ＋ Chr(0)
　　 End Sub
　　 在工程文件的Form1中加入一个PictureBox和一个CommandButton控件，然后在Form1的代码窗口中加入以下的代码：
　　 Option Explicit

　　 Dim AF As APIFont
　　 Dim X, Y As Integer

　　 Private Sub Command1_Click()
　　 Dim I As Integer

　　 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
　　 运行程序，点击Form上的Command1按钮，在窗口的图片框就会出现旋转的文本显示，程序的效果如图所示：
　　 值得注意的问题是，由于Windows的动态连接库的中英文版本的关系，在一些系统中显示中文可能会有一些问题，大家可能看到，上面程序中的语句：AF.FontOut “脑商情报第42期”，Picture2, X, Y中的字符串后面有7个空格，这是对于“电脑商情报第42期”中的7个中文字符，中文系统计算的是7个字符，但是实际它们占据的是14个字节的空间，所以在输出时要在后面添加7个空格做“替身”。