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Visual Basic 6 definition

Declare Function CreateRoundRectRgn Lib "gdi32.dll" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long, ByVal X3 As Long, ByVal Y3 As Long) As Long

Visual Basic .NET definition

Declare Function CreateRoundRectRgn Lib "gdi32" (ByVal X1 As Integer, ByVal Y1 As Integer, ByVal X2 As Integer, ByVal Y2 As Integer, ByVal X3 As Integer, ByVal Y3 As Integer) As Integer

C# definition

[DllImport("gdi32")] public static extern int CreateRoundRectRgn(int X1, int Y1, int X2, int Y2, int X3, int Y3)

Description

Platforms: Win 32s, Win 95/98, Win NT CreateRoundRectRgn creates a rounded rectangular region and provides a handle to it. The region is shaped like a rectangle with rounded corners. The region is specified by the coordinate of a non-rounded rectangle followed by the width and height of the rounded corners. The function returns a handle to the newly created region if successful, or 0 if an error occured. CreateRoundRectRgn Creates a rectangular region with rounded corners. System.Drawing.Drawing2D.GraphicsPath.AddLinesSystem.Drawing.Pen.LineJoin = System.Drawing.Drawing2D.LineJoin.Round

Parameters

X1 The x-coordinate of the upper-left corner of the rectangle. Y1 The y-coordinate of the upper-left corner of the rectangle. X2 The x-coordinate of the lower-right corner of the rectangle. Y2 The y-coordinate of the lower-right corner of the rectangle. X3 The width of the portion of each corner to round. Y3 The height of the portion of each corner to round.

Further Information:

For further information on Windows API functions such as these, and how to use these API's in your C# and VB.NET applications, please refer to the book 'Network programming in .NET' (Buy at Amazon UK) (Buy at Amazon US)

Visual Basic 6 example source code
' Invert the pixels within a rounded rectangular region on window Form1. The ' equivalent non-rounded rectangle has corners (20,30)-(150,110). The rounded corners have ' a width of 15 and a height of 10. Dim hrgn As Long ' handle to the created rounded rectangular region Dim retval As Long ' return value ' Create the rounded rectangular region and get a handle to it. hrgn = CreateRoundRectRgn(20, 30, 150, 110, 15, 10) ' Invert the pixels in Form1 within this region. retval = InvertRgn(Form1.hDC, hrgn) ' Delete the region to free up resources. retval = DeleteObject(hrgn)
Visual Basic .NET example source code

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