Announcement

**Jim Huguley** · 17 Feb 2000, 10:38 AM

Terry..

The Dialog is not displayed when you create it with Dialog New.
Create it, do your calculations for new position and then use

DIALOG SET LOC hDlg&, x&, y&

to move it where you want it.

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Jim..
[email protected]

**Terry Constant** · 17 Feb 2000, 11:18 AM

Jim,

Thanks for your response.

I understand about when dialogs are created and so forth. My problem is that I am writing a DLL to be used with an application. It would solve mulitple problems for me if I can determine correct dialog units before creating a dialog, displaying it, and then setting its position.

It would not be productive for me to go into all the specifics. But it would be MUCH better for me and the application I am writing, in another programming language, if I could determine the correct coordinates in the appropriate dialogs units before I create the dialog, that is, to use with "Dialog New".

Again, thanks for your response, but I am hoping there is a way to accomplish what I want to do.

------------------
Terry

**Eric Pearson** · 17 Feb 2000, 12:02 PM

Terry --

> It would solve mulitple problems for me if I
> can determine correct dialog units before
> creating a dialog, displaying it, and then
> setting its position.

That's what Jim is suggesting. Try it in this order...

Code:

DIALOG CREATE           (with arbitrary size)
DIALOG PIXELS TO UNITS  (using handle from CREATE)
DIALOG SIZE             (with calculated size)
DIALOG MOVE             (with calculated location)
DIALOG SHOW             (dialog actually becomes visible here)

Unfortunately, the dialog-units-to-pixels ratio is dynamic. It is certainly unlikely, but it would be possible for a user to change the Large/Small Fonts setting (in the Control Panel's "Display" applet's "Settings" tab) and thereby change the ratio while your app is running. So if you want to be 100% certain that you are doing the math correctly, you have to create a window, check the ratio, and then size the window.

If you want to take the (admittedly minor) risk, you could use DIALOG NEW create a "dummy" dialog when your app first starts up (or in your DLL's LibMain %PROCESS_ATTACH case), check the horizontal and vertical ratios, save them in GLOBAL variables, and then never show that particular window. As long as the user doesn't change the Large/Small Fonts setting while your app is running, you would be able to safely use those ratios to do all of your calculations for "real" dialogs that you do intend to show.

(Hmmm... off the top of my head, I'm not certain that the ratios don't change when the screen resolution is changed. But even if they do, that's a pretty rare thing too, and the same warning would apply.)

-- Eric

------------------
Perfect Sync: Perfect Sync Development Tools
Email: mailto:[email protected][email protected]</A>

[This message has been edited by Eric Pearson (edited February 17, 2000).]

**Jim Huguley** · 17 Feb 2000, 12:05 PM

Terry...

That is beyond my expertise. Since the conversion requires that the font of the Dialog is used in the calculation you sort of
have a "cart before the horse" situation.

------------------
Jim..
[email protected]

**Terry Constant** · 17 Feb 2000, 12:29 PM

Jim,

You said 'you sort of have a "cart before the horse" situation.'

That is what I am afraid of, but I was hoping.

Eric,

Without going into details, I keep dialog and control properties in an object (or structure if you prefer). I do a lot of calculations about positioning and sizing and so forth and keep these settings. Then I create a dialog and its controls all at one time. I was hoping to have everything correct before creating any dialog stuff.

I have done something like you mentioned with a dummy "Dialog New" to get the conversions. But it seems a bit too imprecise or chancy. I was hoping to find a more stable or accepted method of accomplishing my goals. I guess, unless someone else chimes in with a better idea, I will continue with this line of programming. It gives me some hope that you and I both thought of this same alternative/option. Maybe it will be doable. So, I am off to flesh out and perfect (at least I hope to perfect) this approach.

Thanks to both of you, Jim and Eric, for quick responses. At least now, I feel more confident that I had not missed something obvious that would make my task easier and better.

Thanks again

------------------
Terry

**Eric Pearson** · 17 Feb 2000, 01:46 PM

I guess you need to find out exactly what makes the ratios change. I know that changing from Small Fonts to Large Fonts does it on my NT4 system, but you have to restart Windows in order for the change to take effect so it could never affect a running app. It is possible to change the screen resolution "on the fly" while an app is running, but I don't think that that changes the ratios. Does anybody know exactly what causes the ratios to change?

If you find out that it is impossible for the ratios to change while an app is running, then you can use the "check ratios at app startup" method with complete safety and confidence. I'm betting that only a change in the system font will change the ratios, and that you can't change the system font without restarting. So you'd be home free.

Or how about this...

Write a "wrapper" function for each of the CONTROL ADD functions. Then you could use pixel measurments for everything in your program, and the wrapper functions would do the DIALOG PIXELS calculations for you. The converted numbers would never leave the wrapper functions. In pseudo-code...

Code:

FUNCTION AddButton(MyStruct AS WHAT_EVER) AS LONG
 
   DIM LocalStruct AS LOCAL WHAT_EVER
    
   LocalStruct = MyStruct
 
   DIALOG PIXELS LocalStruct.hParent, LocalStruct.Width, LocalStruct.Height, _
        TO UNITS LocalStruct.Width, LocalStruct.Height
 
   CONTROL ADD BUTTON LocalStruct.hParent... (etc.)

END FUNCTION

If you're worried about a speed penalty caused by doing the calculations on the fly, you'll probably be very surprised how fast DIALOG PIXELS is.

-- Eric

------------------
Perfect Sync: Perfect Sync Development Tools
Email: mailto:[email protected][email protected]</A>

**Terry Constant** · 17 Feb 2000, 02:30 PM

Eric,

Thanks for the ideas. I am going to research some of the things that you mention. I will let you know if I find anything worthwhile.

As to the controls with wrappers and dynamic calculations, those are good ideas. However, I am not having trouble with controls. Dialog units have always worked as expected with controls inside of dialogs. I needed to precisely determine where the dialog itself would be positioned and, if at all possible, to determine the position in advance of "Dialog New", really makes things easier in this other language I am working in.

The dummy "Dialog New" idea that we discussed is working, like I want, in the first routines that I have completed. If they stand up to testing after I polish them, then I think my problem is handled. Thanks for the input on that idea.

BTW I am still open to any suggestions from anyone else.

------------------
Terry

**Terry Constant** · 18 Feb 2000, 01:12 AM

Eric and Jim,

Here are four simple functions that seem to be working for my purposes. They use the "dummy 'Dialog New'" approach that we discussed. I thought you might like to see the approach. Notice the "Export", since these are used in a DLL. I know this, using these functions beats anything I tried based on the Win32Api funtion, GetDialogBaseUnits() and the formulas in its discussion.

Function DlgXtoPixX (ByVal x As Long) Export As Long
Local xx As Long
Local yy As Long
Local hDlg As Long

Dialog New 0, "", 0, 0, 0, 0, 0, 0 To hDlg
Dialog Units hDlg, x, 0 To Pixels xx, yy
Dialog End hDlg
Function = xx
End Function 'DlgXtoPixX

Function DlgYtoPixY (ByVal y As Long) Export As Long
Local xx As Long
Local yy As Long
Local hDlg As Long

Dialog New 0, "", 0, 0, 0, 0, 0, 0 To hDlg
Dialog Units hDlg, 0, y To Pixels xx, yy
Dialog End hDlg
Function = yy
End Function 'DlgYtoPixY

Function PixXtoDlgX (ByVal x As Long) Export As Long
Local xx As Long
Local yy As Long
Local hDlg As Long

Dialog New 0, "", 0, 0, 0, 0, 0, 0 To hDlg
Dialog Pixels hDlg, x, 0 To Units xx, yy
Dialog End hDlg
Function = xx
End Function 'PixXtoDlgX

Function PixYtoDlgY (ByVal y As Long) Export As Long
Local xx As Long
Local yy As Long
Local hDlg As Long

Dialog New 0, "", 0, 0, 0, 0, 0, 0 To hDlg
Dialog Pixels hDlg, 0, y To Units xx, yy
Dialog End hDlg
Function = yy
End Function 'PixYtoDlgY

------------------
Terry

**Lance Edmonds** · 18 Feb 2000, 01:39 AM

Excellent routines Terry... very creative. Fancy placing them in the Source Code forum? Thanks!

------------------
Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

**Eric Pearson** · 18 Feb 2000, 05:33 AM

Terry --

If speed is a major concern, you might consider creating the dummy dialog once at the beginning of your program, and leave it "open" so its handle could be used by your conversion functions. That way you would not be creating and destroying dialogs so often, and it would be a lot faster.

And a tip...

If you put the following "tags" around your source code, but with [square] brackets instead of {curly} ones, the BBS will preserve your indenting...

{CODE}

Code:

FOR X = 1 TO 2
    PRINT X
NEXT

{/code}

-- Eric

------------------
Perfect Sync: Perfect Sync Development Tools
Email: mailto:[email protected][email protected]</A>

**Terry Constant** · 18 Feb 2000, 09:05 AM

Eric,

Good idea. I am going to do some simple benchmarking (simple
loops), using both techniques. I will let you know what
difference in time there is.

------------------
Terry

**Terry Constant** · 18 Feb 2000, 09:21 AM

Eric,

One consideration that I am not sure about. These functions are
being used in a DLL that is being used by another language for
applications. Do you see any pitfalls to leaving the function
open so that it will be faster? I think it will work okay, but I
feel a bit uneasy since multiple applications, from different
languages could be calling these functions in this DLL.

Back to the issue of speed. In some applications with which I
will use the DLL, speed is very important. With others,
functionality is the key. These are compromises I will have to
deal with. I just don't want to fall into an obvious pit that I
should have avoided.

------------------
Terry

**Cecil Williams** · 18 Feb 2000, 10:28 AM

Terry,

One more consideration from the speed aspect would be to
combine those 4 functions into 2, pass the long as usual,
parse the long into HI and LO word, calculate both the xx
and yy, combine into 32bit for returning, then parse the
return value into HI or LO order word. If you are looking for only one say x, then HI word y in long would be zero (0). Vice versa for y on LO end. Just something to consider.

Cecil

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**Eric Pearson** · 18 Feb 2000, 10:52 AM

Terry --

> Do you see any pitfalls to leaving the function open so that it will be faster?

Do it this way and you should be fine...

Code:

FUNCTION LibMain(BYVAL hInstance AS LONG, _
                 BYVAL Reason    AS LONG, _
                 BYVAL Reserved  AS LONG) EXPORT AS LONG
 
        IF Reason = %DLL_PROCESS_ATTACH THEN
 
                'Use DIALOG NEW to create the dummy dialog here.
                 
        ELSEIF Reason = %DLL_PROCESS_DETACH THEN
 
                'Destroy the dummy dialog here.
 
        END IF
 
END FUNCTION

The %DLL_PROCESS_ equates are defined in the WIN32API.INC file.

Each time a new application starts using your DLL they will get their own "copy" of the dummy dialog. And each time an app exits, that dialog will be destroyed.

-- Eric

------------------
Perfect Sync: Perfect Sync Development Tools
Email: mailto:[email protected][email protected]</A>

[This message has been edited by Eric Pearson (edited February 18, 2000).]

**Terry Constant** · 18 Feb 2000, 11:15 AM

Eric,

Of course! Its obvious when you show to me. Now why didn't I
think of that. Seriously, thanks for the help. This solves the
final problem.

I have not programmed in Basic for at least 15 years. I keep getting sidetracked as see things and begin thinking in Basic. PB seems like a great product for what it claims to be. I especially like the fast execution and small executables, perfect for DLLs.

When I get back into a Basic frame of mind, the development time,
for the programs, usually DLLs, that I will be writing beats
anything else I have worked with.

But one terrific feature of PB is its forums. Your input, and
others, has been wonderful. I am days ahead of where I would be
if I were researching and testing all of this stuff alone. Plus,
I have much more confidence in the code because of our dialogues.

Thanks again, and thanks to the others who have responded. All
of you and your ideas have truly assisted me. And, while I am
thanking people, thanks to PB for providing such a good forum.

Sheesh! Before I start thanking my next door neighbors and their
dogs, I guess I will stop.

------------------
Terry

**Terry Constant** · 18 Feb 2000, 12:51 PM

Eric et al,

I implemented Eric's idea of "Dialog New" and "Dialog
End" in LibMain. I tested the speed with my first
functions and compared the speed with them modified to
work with Eric's idea. The speed improvement is
significant.

Creating the dialog in LibMain when attached, getting my
conversions while it is created, and then ending the
dialog when detached (as Eric suggested) was nine (9)
times faster than the original functions.

That kind of speed increase is worthwhile. Thanks Eric
for the help. That Pixel to/from dlgUnits issue was the
last real hurdle for my DLL. I am tweaking now and will
have a first final, 1.0, in the near future.

Thanks again.

------------------
Terry

**Anand Kumar** · 19 Feb 2000, 02:17 AM

You can also the following API call

GetDialogBaseunits

to get the dialog base units and then convert it to the pixel format.

------------------
Anand Kumar

**Lance Edmonds** · 19 Feb 2000, 02:56 AM

Anand, the problem is that GetDialogBaseUnits() is not guaranteed to return correct values in all circumstances, hence the reason for this thread.

There is another way to do it using MapDialogRect(), but I don't have the code handy for this (I came across it in a WIN32.ANN annotation file).

------------------
Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

**Cecil Williams** · 22 Feb 2000, 03:45 AM

Lance,

Found this code in one of my "C" ref files. Haven't tried
the translated version.

Cecil

FUNCTION dlgBaseUnits2Pels(hDlg AS LONG) AS DWORD

LOCAL rc AS RECT

SetRect rc, 0, 0, 4, 8
MapDialogRect hDlg, rc

FUNCTION = MAKDWD(rc.nRight, rc.nBottom)

END FUNCTION

------------------

Announcement

Dialog units before a "Dialog New" statement

Dialog units before a "Dialog New" statement

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