Subclassing and Hooking with Visual Basic

Name

WNDCLASSEX

Synopsis

Defines a window’s class:

Public Type WNDCLASSEX
    cbSize As Long
    style As Long
    lpfnWndProc As Long
    cbClsExtra As Long
    cbWndExtra As Long
    hInstance As Long
    hIcon As Long
    hCursor As Long
    hbrBackground As Long
    lpszMenuName As String
    lpszClassName As String
    hIconSm As Long
End Type

Structure Members

cbSize

The size of this structure. You should set it to Len(WNDCLASSEX).

style

A combination of class style constants ORed together. These styles determine the fundamental look and operation of a window created from this class. For example, the CS_NOCLOSE constant disables the Close option on the class’s window menu, while the CS_HREDRAW constant forces a redraw of the window whenever the width of its client area changes.

lpfnWndProc

The function pointer to the window procedure for this class.

cbClsExtra

Amount of extra space to add to the end of the class structure. The developer uses this to store class-related information.

cbWndExtra

Amount of extra space to add to the end of the window structure. The developer uses this to store window-related information.

hInstance

The instance handle of the module that contains the window procedure for this class.

hIcon

Handle to an icon resource.

hCursor

Handle to a cursor resource.

hbrBackGround

The handle to a brush or a color value used to paint the background of the window created from this class.

lpszMenuName

The null-terminated string that defines the menu resource.

lpszClassName

The null-terminated string or class atom ...