salamander
asked on
Getting double BN_CLICKED messages in dlg...
In an application I'm working on I have a group of radio buttons. I elected to handle the messages myself, so I turned the AUTO property of these buttons off. To handle turning the radio buttons on and off, I handle the BN_CLICKED message. This seems to work fine, with one exception: I'm getting 2 BN_CLICKED messages for each time I click on the radio button. Any suggestions?
Yes, one is the button down message and the other is the button up message.
ASKER
So, how can I tell which is which so I can disregard one of them?
ASKER
I need an answer, sorry.
Dear salamander,
As you probably note the BN_CLICKED message carries the following info:
idButton = (int) LOWORD(wParam); // identifier of button
hwndButton = (HWND) lParam; // handle of button
so if you know hwndButton for each of you buttons, at the program begining record it your defaults handle as oldButtonHandle. Then when receive BN_CLICKED :
ignore the message if hwnButton == oldButtonHandle
and process if hwnButton != oldButtonHandle {
... // processing code
oldButtonHandle := hwnButton
}
Does it solves your problem! (It may require other steps if you wrote in Delphi or VB)
Please notify,
Sincerely,
Igor
As you probably note the BN_CLICKED message carries the following info:
idButton = (int) LOWORD(wParam); // identifier of button
hwndButton = (HWND) lParam; // handle of button
so if you know hwndButton for each of you buttons, at the program begining record it your defaults handle as oldButtonHandle. Then when receive BN_CLICKED :
ignore the message if hwnButton == oldButtonHandle
and process if hwnButton != oldButtonHandle {
... // processing code
oldButtonHandle := hwnButton
}
Does it solves your problem! (It may require other steps if you wrote in Delphi or VB)
Please notify,
Sincerely,
Igor
ASKER
Is BN_CLICKED the only solution for this? Is it the best solution? This just seems to be too common a situation to have no standard way of message handling.
Please indicate the compiler you are using, so if I know more (or specific handling)I can help you.
Thanks,
Igor
Thanks,
Igor
ASKER
I'm using Microsoft VC++ 5. I'm not using MFC, just standard WIN32 API.
Friend,
I am mainly using Delphi 2.0. So, in about 15 minutes I can digup the source code for their library and find out how they can simply do on group of radio buttons and post C pseudo code, it may solve your problem.
If you want to add anything I am here to extend the discussion.
Igor
I am mainly using Delphi 2.0. So, in about 15 minutes I can digup the source code for their library and find out how they can simply do on group of radio buttons and post C pseudo code, it may solve your problem.
If you want to add anything I am here to extend the discussion.
Igor
Wow!
Thats a mess but I try to explain. They provide a base that can handle any windows control. But for our problem, the easiest way can be as follows(here we cannot follow but simulate Borlands way):
1 - The idea is to use the message sending logic of the customcontrol such as radio buttons. The BN_CLICKED message is passes to the owner of the radiobuttons. So first we should create a group box.
2 - Place only radio buttons to this group box and set the id of these group boxes to 0 to N-1
3 - Override WM_COMMAND of group box we have created
4 - If the message is BN_CLICKED use switch to determine the IDs(0 to N-1) and perform the required funtion.
Unfortunately, without using an OOP approach we can not simplify more(as far as I know).
Sincerely,
Igor
Thats a mess but I try to explain. They provide a base that can handle any windows control. But for our problem, the easiest way can be as follows(here we cannot follow but simulate Borlands way):
1 - The idea is to use the message sending logic of the customcontrol such as radio buttons. The BN_CLICKED message is passes to the owner of the radiobuttons. So first we should create a group box.
2 - Place only radio buttons to this group box and set the id of these group boxes to 0 to N-1
3 - Override WM_COMMAND of group box we have created
4 - If the message is BN_CLICKED use switch to determine the IDs(0 to N-1) and perform the required funtion.
Unfortunately, without using an OOP approach we can not simplify more(as far as I know).
Sincerely,
Igor
ASKER
This is what I have been doing. This does not eliminate the double BN_CLICKED messages. I'll just use your first answer. Respond back by answering, and I'll give you the points.
ASKER CERTIFIED SOLUTION
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