BeginPath,EndPath API函数在Visual Basic中有何用途?
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Public Delcare Function EndPath Lib "gdi32" Alias "EndPath" (ByVal hdc As Long) As Long【函数】
BeginPath【操作系统】
Win9X:Yes
WinNT:Yes【声明】
BeginPath Lib "gdi32" Alias "BeginPath" (ByVal hdc As Long) As Long【说明】 启动一个路径分支。在这个命令后执行的GDI绘图命令会自动成为路径的一部分。对线段的连接会结合到一起。设备场景中任何现成的路径都会被清除。参考下表,其中列出的函数都可记录到路径中 【返回值】 Long,非零表示成功,零表示失败。会设置GetLastError 【其它】
【参数表】
hdc ------------ Long,欲在其中记录的设备场景
合法的路径函数
函数
Windows NT
Windows 95
函数
Windows NT
Windows 95
AngleArc
Yes
No
Arc
Yes
No
ArcTo
Yes
No
Chord
Yes
No
Ellipse
Yes
No
ExtTextOut
Yes
Yes
LineTo
Yes
Yes
MoveToEx
Yes
Yes
Pie
Yes
No
PolyBezier
Yes
Yes
PolyBezierTo
Yes
Yes
PolyDraw
Yes
No
Polygon
Yes
Yes
Polyline
Yes
Yes
PolylineTo
Yes
Yes
PolyPolygon
Yes
Yes
PolyPolyline
Yes
Yes
Rectangle
Yes
No
RoundRect
Yes
No
TextOut
Yes
Yes【函数】
EndPath【操作系统】
Win9X:Yes
WinNT:Yes【声明】
EndPath Lib "gdi32" Alias "EndPath" (ByVal hdc As Long) As Long【说明】 停止定义一个路径。如执行成功,BeginPath函数调用和这个函数之间发生的所有绘图操作都会正式成为指定设备场景的路径 【返回值】 Long,非零表示成功,零表示失败。会将GetLastError设置为下述值之一:ERROR_CAN_NOT_COMPLETE
或 ERROR_INVALID_PARAMETER 【其它】
【参数表】
hdc ------------ Long,设备场景
Private Declare Function BeginPath Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function EndPath Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function PathToRegion Lib "gdi32" (ByVal hdc 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 SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Sub Form_Click()
'end..
Unload Me
End Sub
Private Sub Form_Load()
Dim hRgn As Long
Const sText = "Click Here!"
'set the font to 'Times New Romen, size 72'
Me.FontName = "Times New Roman"
Me.FontSize = 72
'set the backcolor to Red
Me.BackColor = vbRed
'open a path bracket
BeginPath Me.hdc
'draw the text
TextOut Me.hdc, 0, 0, sText, Len(sText)
'close the path bracket
EndPath Me.hdc
'convert the path to a region
hRgn = PathToRegion(Me.hdc)
'set the Window-region
SetWindowRgn Me.hWnd, hRgn, True
'destroy our region
DeleteObject hRgn
End Sub