Name

Type

Optional

Meaning

hWnd

Number

No

Handle of the dialog you want to get next message

wParam

Variable

No

A numeric existing variable name. This variable will be filled with additional message-specific information

lParam

Variable

No

A numeric existing variable name. This variable will be filled with additional message-specific information

ptrToNMHDR_Structure

Pointer

Yes

This must be a pointer to a variable of type NMHDR. NMHDR is a structure (UDT) defined as described in Remarks here below. If present, this structure will be automatically filled with notification information received from child controls inside a window.

To use this parameter, pass something like: VARPTR(My_NMHDR) where My_NMHDR is a variable of type NMHDR.

lCBCTL

Variable

Yes

A numeric variable. If present, it will receive the numeric ID value of the control sending the message. In many cases it is equivalent to: LOWRD(wParam)

lCBCTLMSG

Variable

Yes

A numeric variable. If present, it will receive the numeric value of a notification message parameter sent from a control. In many cases it is equivalent to: HIWRD(wParam)