Solved

Set a hook to intercept WM_COMMAND sent from a menu

Posted on 2004-10-14
6
941 Views
Last Modified: 2008-01-09
Hello,

I have an ActiveX DLL which is loaded by an application (MSN Messenger) in the same thread. I want the DLL to know when the button "Send File" in the application is pressed.

Using Spy++, I've found that it generates this message when the button is pressed:
000C044A P WM_COMMAND wNotifyCode:0 (sent from a menu) wID:40275 [wParam:00009D53 lParam:00000000]

How can I intercept that message from the DLL?

I've tried WH_MSGFILTER and WH_GETMESSAGE hooks but they do not seem to fire when the button is pressed. Any ideas?
0
Comment
Question by:ricardog2
  • 4
  • 2
6 Comments
 
LVL 17

Expert Comment

by:zzzzzooc
ID: 12320124
>>but they do not seem to fire when the button is pressed.
Are you sure the hook installs correctly? I'm not sure if the application would have access to a procedure in your EXE or not.

Alternatively, you can try to cross-process subclass the actual Button's window to receive the WM_COMMAND.

http://Q_21164345.html#12295292
0
 
LVL 17

Accepted Solution

by:
zzzzzooc earned 250 total points
ID: 12320128
0
 
LVL 1

Author Comment

by:ricardog2
ID: 12321721
I've used the examples available at http://www.oreilly.com/catalog/subhookvb/ to install the hooks. I get messages when I click on the menu or drag the window, but I'm not sure which kind of hook is needed to intercept that specific message.

Also, my procedure is in the same thread as the EXE (I've compared the App.ThreadID to the EXE's one listed in Spy++), so it should work without a cross-process hook. Anyway, I'll try that.

Thanks for the answer.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 1

Author Comment

by:ricardog2
ID: 12322763
I got it working! It really was WH_GETMESSAGE, but the oreilly's example code had to be modified a bit to get the message correctly.

Since I've found the problem with the DLL you've suggested, I'll give you the points.
0
 
LVL 17

Expert Comment

by:zzzzzooc
ID: 12327828
'grats. Also, in case you haven't gotten to it, you may have the get the high/low bits for wParam (or lParam.. forgot) to know which button notification (BN) was sent (such as BN_CLICKED).


0
 
LVL 17

Expert Comment

by:zzzzzooc
ID: 12327844
Unless you meant a menu-item instead of a button (doh). Just woke up so I'm a bit dazed.. lol :)
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
VBA/SQL - Connect to SQL server and pull data 4 88
Convert VB6 MSXML2.ServerXMLHTTP process to C# 2 40
Spell Check in VB6 13 95
Added a column screws up code 5 47
When designing a form there are several BorderStyles to choose from, all of which can be classified as either 'Fixed' or 'Sizable' and I'd guess that 'Fixed Single' or one of the other fixed types is the most popular choice. I assume it's the most p…
Article by: Martin
Here are a few simple, working, games that you can use as-is or as the basis for your own games. Tic-Tac-Toe This is one of the simplest of all games.   The game allows for a choice of who goes first and keeps track of the number of wins for…
Get people started with the process of using Access VBA to control Excel using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Excel. Using automation, an Access application can laun…
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…

943 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

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now