Problems with LN_ENTER & DID_OK

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3 total messages Started by Juha Ruotsalainen ti Wed, 10 Oct 1990 12:39

#1562

Author: Juha Ruotsalainen ti
Date: Wed, 10 Oct 1990 12:39

32 lines
1607 bytes

Question #1:
	Why API-calls use stack instead of registers?

Question #2:
	 I my program I have a dialog box which has one list box(in
	which drives, directories and files are listed) and Enter and
	Cancel pushbuttons.
	 The problem arises when I am scrolling	thru the list and
	press <ENTER> when I want to change drive/directory or read in a
	file. Enter generates LN_ENTER which I process and DID_OK
	which I process. But there is no need for processing the
	DID_OK msg, because both call the same subroutine.
	 At the moment I have a flag indicating whether to process
	DID_OK and it works. Fine.
	 BUT in the sample program(graphic2) which came with Toolkit
	there are no flags.

	 What do I do wrong ?

	I hope there is someone who can help me...

-Jussi-


	


--
 ===E.C.Stone or J.Ruotsalainen=========Internet  :  so-ecs at stekt.oulu.fi===
        When I feel myself slowing down , I know for sure that I've been
    here before, 'cause if it isn't an action replay, what else could it be.
 ============================Klaustrofobiaako ??===============================

Re: Problems with LN_ENTER & DID_OK

#1567

Author: Lawrence W Salomon
Date: Thu, 11 Oct 1990 14:15

13 lines
1167 bytes

1:  I think that it has something to do with protect mode and stack switching
    when a function gate is invoked.

2:  I'm not sure what you are asking.  If you are stating that when you have
    a default pushbutton and the listbox has the focus when enter is pressed,
    that a WM_COMMAND/DID_OK and WM_CONTROL/LN_ENTER get generated, then you
    are correct (in 1.2, that is).  I never really bothered to try and get
    around this, but what you could do is take out the default pushbutton
    and generate the WM_COMMAND/DID_OK yourself (say, when ENTER was pressed
    and a FILE was highlighted.).

Cheers,
Q

Re: Problems with LN_ENTER & DID_OK

#1572

Author: Steve Resnick
Date: Thu, 11 Oct 1990 16:21

19 lines
1216 bytes

In article <SO-ECS.90Oct10133953@stekt.oulu.fi> so-ecs@stekt.oulu.fi (Juha Ruotsalainen ti) writes:
>Question #1:
>	Why API-calls use stack instead of registers?
>
	To be compatible with High-level language calling sequence (Pascal)
	To allow the passage of more parameters and data structures than
	would be available in registers
	To be re-entrant.


Cheers!
Steve


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