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CommonDialog.HookProc Method

Defines the common dialog box hook procedure that is overridden to add specific functionality to a common dialog box.

Namespace:  Microsoft.Win32
Assembly:  PresentationFramework (in PresentationFramework.dll)

protected virtual IntPtr HookProc(
	IntPtr hwnd,
	int msg,
	IntPtr wParam,
	IntPtr lParam
)

Parameters

hwnd
Type: System.IntPtr

Window handle for the Win32 dialog.

msg
Type: System.Int32

Windows message to be processed by the Win32 dialog.

wParam
Type: System.IntPtr

Parameters for dialog actions.

lParam
Type: System.IntPtr

Parameters for dialog actions.

Return Value

Type: System.IntPtr
Always returns Zero.

HookProc handles dialog initialization by centering the dialog window, relative to the screen, and to set focus to the default control.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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