Solved

Subclassing - access control properties from its hWnd

Posted on 1997-05-02
2
251 Views
Last Modified: 2011-10-03
I am current attempting to use VB5 to subclass the MaskEdBox control.  This involves coding a C-Style WndProc that has the arguments: hWnd, uMsg, wParam, lParam and redirecting the messages sent to the control to the WndProc.  Here's my question:  Using the hWnd passed to the proc, how can I access the Mask property of the MaskEdBox control?
0
Comment
Question by:Rosedust
[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
2 Comments
 
LVL 3

Accepted Solution

by:
dansari earned 100 total points
ID: 1425923
I believe you cannot access properties of an OLE control just by knowing its hWnd - the window of an OLE control is actually quite removed from the "heart" of the control.

Your method would work fine if you're subclassing a regular Windows control.

But, if you want to subclass an OLE (ActiveX) control, you should use VB5 to create an ActiveX project, and use the MaskEdBox in here.  This way, your control acts as a "wrapper" around the MaskEdBox.  You can make a Mask property (as well as all the other properties/methods/events of MaskEdBox) in your control,
so that it will behave as much like MaskEdBox as you want.
0
 

Author Comment

by:Rosedust
ID: 1425924
The ActiveX / OLE solution is unacceptable because it is extremely slow when compared to the subclassing method.  If a single form has a large number of these controls, the user is forced to sit and wait while the controls load.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
MsgBox 2 61
Help with retrieving partial value from a column using VB.NET 4 53
MS Access 03, TransferText, decimal places 8 85
Set WorkSheet  not Working 9 51
I’ve seen a number of people looking for examples of how to access web services from VB6.  I’ve been using a test harness I built in VB6 (using many resources I found online) that I use for small projects to work out how to communicate with web serv…
Introduction While answering a recent question (http://www.experts-exchange.com/Q_27402310.html) in the VB classic zone, I wrote some VB code in the (Office) VBA environment, rather than fire up my older PC.  I didn't post completely correct code o…
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…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

740 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