Solved

(Enabling) - SetWindowLong

Posted on 1998-11-27
3
329 Views
Last Modified: 2006-11-17
Hi,

Can somebody show me how I could enable a command button
using the API function
SetWindowLong?

Thanks
0
Comment
Question by:BabyFace
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 2

Accepted Solution

by:
trillo earned 20 total points
ID: 1447175
Wow!.... strange but elegant way for enabling/disabling a button.

The declarations are these:

Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Const GWL_STYLE = (-16)
Private Const WS_DISABLED = &H8000000
Dim prev As Long


To enable the button use this code:
  Dim l As Long
  l = GetWindowLong(Command1.hwnd, GWL_STYLE)
  prev = SetWindowLong(Command1.hwnd, GWL_STYLE, l And Not WS_DISABLED)

To disable the button use this code:
  Dim l As Long
  l = GetWindowLong(Command1.hwnd, GWL_STYLE)
  prev = SetWindowLong(Command1.hwnd, GWL_STYLE, l Or WS_DISABLED)

Take special atention to the bitwise And Or and Not operators

Trillo
0
 
LVL 13

Expert Comment

by:Mirkwood
ID: 1447176
Why not using EnableWindow?
0
 
LVL 1

Author Comment

by:BabyFace
ID: 1447177
Thank you.

0

Featured Post

Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I was working on a PowerPoint add-in the other day and a client asked me "can you implement a feature which processes a chart when it's pasted into a slide from another deck?". It got me wondering how to hook into built-in ribbon events in Office.
This article describes some techniques which will make your VBA or Visual Basic Classic code easier to understand and maintain, whether by you, your replacement, or another Experts-Exchange expert.
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…

728 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question