Parameters

hWnd

The handle to the dialog box window.

msg

The message being received.

wparam

Additional information about the message.

lparam

Additional information about the message.

Returns

A zero value if the default dialog box procedure processes the message; a nonzero value if the default dialog box procedure ignores the message.

Remarks

A hook procedure is a mechanism by which a function can intercept events before they reach an application. When you override the CommonDialog.HookProc(IntPtr, int, IntPtr, IntPtr) method for a System.Windows.Forms.CommonDialog class, the operating system invokes your override of the function to post operating system messages to the window.

Requirements