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From: dave@PRC.Unisys.COM (David Lee Matuszek)
Newsgroups: comp.sys.mac.programmer
Subject: Basic DLOG/DITL question
Message-ID: <17230@burdvax.PRC.Unisys.COM>
Date: 15 Apr 91 13:40:55 GMT
Sender: news@PRC.Unisys.COM
Organization: Unisys Corporation, Paoli Research Center; Paoli, PA
Lines: 75


OK, I'm missing something really fundamental here.

I have a very simple application, with a DLOG 128 whose DITL ID is set
to 128.  It's initially visible and is purgeable.  This is my only
window.

I have a DITL 128.  It has three static texts, two editable texts, 11
radio buttons, an OK button, and an icon.  It's purgeable.  Both these
resources were created with ResEdit 2.1.

In THINK Pascal 3.0 I call

	myDialog := GetNewDialog(128, nil, WindowPtr(-1));

and the DLOG window appears.  But nothing appears in the window.

When I call

	GetDItem(myDialog, editText1, itemType, itemHandle, itemRect);
	SetIText(itemHandle, myString);

the appropriate editable text item appears.  For the radio buttons,
when I call

	GetDItem(myDialog, radioButton4, itemType, itemHandle, itemRect);
	SetCtlValue(ControlHandle(itemHandle), 1)

the radio button appears, but if I call SetCtlValue with 0 instead of
1, it doesn't.

If I call

	DrawControls(myDialog);

this makes all the radio buttons and the one button appear, but does
not make the static or editable text items or the icon appear.

Here's where it gets weird.  If the radio buttons are visible and I call

	HideDItem(myDialog, radioButton4)

then the indicated radio button disappears; and when I call

	ShowDItem(myDialog, radioButton4)

it stays gone.  (DrawControls will bring it back, though.)

(Note:  editText1 and radioButton4 are small integers, in the range
1..18, corresponding to the DITL item numbers.)

Enabling or disabling the various controls should have no effect, and
in fact it does not.

I know I'm doing something really stupid here; I recognize the
symptoms of a dumb mistake.  Unfortunately the fact does not help me
figure out what it is.  As near as I can tell, the connection between
the DLOG and the DITL is not being made properly, but it sure looks OK
in ResEdit 2.1.

Help?  [PLEASE don't assume someone else will answer; I don't mind
getting lots of e-mail, but I dread getting none.]

P.S.  MacIIsi, System 6.0.7.


-- Dave Matuszek (dave@prc.unisys.com)  I don't speak for my employer. --
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|   When I was young, my family bought a color TV.  Our neigbors, who   |
| were poorer, had only a black-and-white set.  They bought a piece of  |
| cellophane, red on top, yellow in the middle, and blue on the bottom, |
| and taped it over their screen, so they could claim that they had a   |
| color TV, too.                                                        |
|   Now there's Windows 3.0.                                            |
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