Creating form with api calls.

[tonyevans]

Ok, I have some code that will create a form, listbox, and two buttons. I want to be able to upon pressing the OK button the data selected in the listbox must be returned. In the long run, I want this whole thing to work like an msgbox or inputbox, but will use an listbox instead. As of right now, I cannot get the buttons to work. Could you guys take a peek and see what I am doing wrong. Also, do you have any code that will allow me to get the selected data out of the listbox.

Thanks.

I have attached to module.

[jim mcnamara]

Your code looks like Charles Petzold playing VB.

Don't subclass the buttons - you've already got the GetMessage function. Test for mouse button activity in there. Just put a bunch of case statements to trap what you need by hWnd of the window (buttons) of interest

Send WM_GETTEXT to the listbox to return the text. The text has to be returned in a Property statement to the client.

I don't see any interface definitions or Implements or whatever.
You need those, as I assume you know.

[tonyevans]

If I may ask, who is Charles Petzold? I am not sure of a good way to do this because the only examples I have found always seem to come from the api guide which I already have. I want to learn how to do this not just be able to copy and paste code; so, if anyone has a good site or book to learn how to use apis, then let me know. I will work on your suggestion because I feel like there should be an easier way than what I am current doing. If you or anyone has any code that could aid in learning how to do this, please post it.

[jim mcnamara]

Charles Petzold is one of the designers of Windows 16 bit & 32 bit.

He has several books on programming Windows. Basically, what you are doing is better off done in C. The reason is that a lot of api's you will need are inaccessible from VB. As I understand it, VB.NET gets around those restrictions, so hang in there.
Most windows internals books are C-based, as are Petzold's.

Suggestions:

www.mvps.org --- there is a lot of material at several MVP sites

www.mvps.org/vb/hardcore ---
online copy of Hardcore Visual Basic - a must.

Visual Basic Bible - covers a lot of what you are doing. Monstrous tome.

Search the vbforum here for: subclassing

And since Hardcore is a freebie, you really should consider downloading and reading it. It will get you past a lot of problems you are now having.

When I have some time, I'll get your code going, but I don't have VB on this machine, just C. From the tone of your reply, I'd guess that you really did just cut and paste. Please read Hardcore.

[tonyevans]

Thanks. At the time of my post I was still trying to figure out what was even going on and was hoping I could get some help understanding it.

[tonyevans]

could I write this in C and use it in VB?

[jim mcnamara]

C++ -- Of course, as long as you provide a COM interface for the control.