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Visual Basic 6 definition

Declare Function SetWindowRgn Lib "user32.dll" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long

Visual Basic .NET definition

Declare Function SetWindowRgn Lib "user32" (ByVal hwnd As Integer, ByVal hRgn As Integer, ByVal bRedraw As Boolean) As Integer

C# definition

[DllImport("user32")] public static extern int SetWindowRgn(int hwnd, int hRgn, bool bRedraw)

Description

SetWindowRgn changes the visible region of a window. Using this function, you can make a window appear non-rectangular. Any portion of the window lying outside of the region is not drawn, and so is invisible. SetWindowRgn Sets the window region of a window. System.Windows.Forms.Control.Region

Return Value

If successful, the function returns a non-zero value. If an error occured, the function returns zero (Windows NT/2000: use GetLastError to get the error code).

Parameters

hWnd A handle to the window to set the region of. hRgn A handle to a region that defines what to make the visible area of the window. If this is zero, the entire window is displayed (effectively removing any special region set previously). bRedraw Specifies whether to immediately redraw the window using its new region or not. If this is True, the window is redrawn. If this is False, it is not.

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)

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