FileDialog.HookProc(IntPtr, Int32, IntPtr, IntPtr) Method
Definition
Important
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Defines the common dialog box hook procedure that is overridden to add specific functionality to the file dialog box.
protected:
override IntPtr HookProc(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam);protected override IntPtr HookProc (IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam);override this.HookProc : nativeint * int * nativeint * nativeint -> nativeintProtected Overrides Function HookProc (hWnd As IntPtr, msg As Integer, wparam As IntPtr, lparam As IntPtr) As IntPtrParameters
- hWnd
-
IntPtr
nativeint
The handle to the dialog box window.
- msg
- Int32
The message received by the dialog box.
- wparam
-
IntPtr
nativeint
Additional information about the message.
- lparam
-
IntPtr
nativeint
Additional information about the message.
Returns
nativeint
Returns zero if the default dialog box procedure processes the message; returns a nonzero value if the default dialog box procedure ignores the message.
Remarks
A hook procedure allows the user to connect or insert other routines into a routine or application for the purpose of debugging or enhancing functionality.
By default, the hook procedure centers the dialog box on the screen in response to a WM_INITDIALOG message.
Notes to Inheritors
When overriding HookProc(IntPtr, Int32, IntPtr, IntPtr) in a derived class, be sure to call the base class's HookProc(IntPtr, Int32, IntPtr, IntPtr) method.
