onscreen barcode ?

[elch]

Hi,

anybody with a barcode scanner ready at hand, to check if onscreen is possible ?

( have heard some modern cellphone understand QRCode .. )

You can use GTXWC or GTQTC -- GTWVT actually draws rectangles one pixel too wide

best regards

Rolf

[Richard Acosta]

I scan barcode from screen with my cellphone. Is not about the phone itself, you need the software installed and then you take a picture or just point the camera to the code and the  program makes the translation over the preview.

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[Maurício Ventura Faria]

Hi.
 
I did it in the past and it was ok.
 
But, in my experience, different scanners may not do it...
 
[[]] Mauricio Ventura Faria

[elch]

Thanks, Mauricio, Walter

good news !

Core developers feel free to add example into contrib/hbzebra/tests if they like it.
GT but not OS dependent ..

best regards
Rolf

[Qatan]

Hello Rolf / Pritpal,

 

 

>You can use GTXWC or GTQTC -- GTWVT actually draws rectangles one pixel too wide

 

 

Very interesting but I don’t have any barcode scanner to test it...

I tried with GTWVT and GTWVG under Win7Pro32 but the barcodes disappear if I maximize the window or try to resize it... not to count the problem with the one pixel too wide but why GTWVT/WVG do that? Is there any way to fix it?

 

I did test also with GTWVG and it showed the following differences compared to GTWVT (it may be useful to Pritpal):

 

1) The close button doesn’t work (GTWVT works fine)

2) If you maximize the window then you can not restore to the original size (GTWVT works fine)

3) Takes 4 to 5 times longer to build (I use default C compiler: MingW and Harbour 3.2.0dev (r1407111333) (GTWVT is much faster to build)

4) If you build without –gui option then it will create an extra console window when you execute it. (GTWVT doesn’t do that)

 

Thanks for the example.

Regards,

 

Qatan

[elch]

Hi Qatan,

I tried with GTWVT and GTWVG under Win7Pro32 but the barcodes disappear if I maximize the window or try to resize it... not to count the problem with the one pixel too wide but why GTWVT/WVG do that? Is there any way to fix it?

 

is mentioned at top in source: graphics not persistent in GTWVT.

You can watch for HB_K_RESIZE, after that you have to redraw,

but it won't help if you switch to another window, grab it at the title bar,

and use this as 'cleaning rag' ;-)

Herefore you can watch for HB_K_GOTFOCUS [after lostfocus], and do the same redraw.

That will not cover the situation, if you have moved the barcode window partially outside the desktop screen ..

And my hint about one pixel too large drawn rectangle was somehow rejected ....

best regards

Rolf

[Pritpal Bedi]

Hi Qatan

GFX primitives in (x)Harbour are not implemented as 

persistent object so every erase/refresh operation will 

erase them.

I talked in length with Giancarlo who implemented 

it in xHarbour and then ported to Harbour, about why 

cannot we introduce persistence to these objects.

His arguments at that time were something I never 

accepted. To overcome this situation I designed 

Wvg _* controls which go side-by-side with console 

implementation without the need to think deep how 

GtWVG GUI is implemented.

Look for contrib/gtwvg/tests/_cuigdlg.prg

Activation is via demowvg.exe -> Traditional -> WVG Console with GCUI.

Here is the image:

Pritpal Bedi
a student of software analysis & concepts

[elch]

Hi Pritpal,

they are persistent in GTQTC and GTXWC, what else needed ?

best regards
Rolf

[Pritpal Bedi]

Hi

they are persistent in GTQTC and GTXWC, what else needed ?

I have not gone through all GTs how these manage 

them to be persistent. If it can be in GtQTC there is no reason 

it cannot be in GtWVT or for the same reason in GtWVG.

Can you show me a small demo example for GtQTC where 

these behave as persistent ?

[elch]

addendum, dear Pritpal

in these both GTs i only must watch for HB_K_RESIZE, which can be disabled for such a case.
And i believe they can be made also persistent in GTWVG

best regards
Rolf

[Pritpal Bedi]

Hi

in these both GTs i only must watch for HB_K_RESIZE, which can be disabled for such a case.
And i believe they can be made also persistent in GTWVG

This behavior is not for what GtWVG is designed for.

HB_K_RESIZE behavior is application controlled so any GT can 

take use of it, no issues.

Anyway what happens when another window makes a trip over 

the GFX object ?

Pritpal Bedi

[elch]

Hi Pritpal,

i have a name :-)

nothing -- window manager ! will redraw the barcodes .. i call that 'persistent'

best regards
Rolf

[elch]

Dear Pritpal,

to drag up an old thread, when i was much more unexperienced with Harbour GTs.
Invested since then uncountable hours ...
https://groups.google.com/d/msg/harbour-users/agqNvpLAwbg/wkQhPI4r44gJ

best regards
Rolf

[Qatan]

Hello Rolf,

 

Thanks for explaining a bit more the “mysterious” disappearance.

Regards,

 

Qatan

[Qatan]

Hello Pritpal,

 

Thanks for taking time to help me to understand it.

Regards,

 

Qatan

 

 

From: Pritpal Bedi

Sent: Monday, September 22, 2014 11:44 PM

To: harbou...@googlegroups.com

Subject: Re: [harbour-users] onscreen barcode ?

 

[elch]

One minor more, Pritpal

Look for contrib/gtwvg/tests/_cuigdlg.prg

Activation is via demowvg.exe -> Traditional -> WVG Console with GCUI.

after adaption of HB_K_CLOSE into GTWVG, your interesting but stone age K_ESC based demowvg doesn't exit anymore with click on 'X' [ close window ] ..

Back to K_ESC for that click ? :-)

best regards

Rolf 'GT hacker'

[Qatan]

Hello Rolf ‘GT hacker’

 

It’s good to have you around to test all that.

You contributed to make what was good to be even better!

Thank you

 

Qatan