resolution of a JPG

[Otto]

Hello friends,
How can I get the resolution of a JPG?

I want to remember that I read here that it can be done without opening and reading the photo.

Best regards,
Otto

[Marc Venken]

Maybe this post ?

http://forums.fivetechsupport.com/viewtopic.php?f=3&t=16312&hilit=jpg+resolution&sid=3c21fef10f4377eed5600cb7087a1afd

[Otto]

Hello Marc,

Thanks. With the help of your link, I remembered that I already solved the problem with modHarbour and a JS LIB.
Thanks again.
Should also work with WEBVIEW2.
Here is the link to the library:
https://github.com/exif-js/exif-js

Best regards,
Otto
PS: That's where forensics starts.

[Otto]

Hello Marc,
now I remember.
I wanted to program a working time recording.
A display shows a clock with a QR code that changes every 10 sec.

When an employee scans the QR code and follows the link, the photo is sent to the server and the metadata is read out.

If the picture is older than e.g. 10 sec. then the server reports that the capture was not correct.
This means that the employee must be on-site because he needs the current link and must send immediately.

Best regards,
Otto

[Otto]

...
The program is still working:
https://winhotel.space/qrcodejs-master/index-svg.prg

Best regards,
Otto

[nageswaragunupudi]

Great !

[nageswaragunupudi]

Great !

[Otto]

Dear Mr. Rao,
Hearing that from you means a lot to me.
Have a nice Sunday.
Best regards,
Otto

[nageswaragunupudi]

Hello friends,
How can I get the resolution of a JPG?

I want to remember that I read here that it can be done without opening and reading the photo.

Best regards,
Otto

FWH function

Code: Select all  Expand view

JpegDim( cFileJpg ) // --> { nWidth, nHeight }

Source: fwh\source\function\imgtxtio.prg

Ofc, can not provide as much information as the exif.js

[Jimmy]

hi Otto,

for Desktop App you can get Information of JPG File this Way

Code: Select all  Expand view

#include "fivewin.CH"
PROCEDURE MAIN
   MsgInfo( hb_valToExp( JpgMetaData("d:\Bilder\NASA\","02-spitzer-smc.jpg") ) )
RETURN

FUNCTION JpgMetaData( cPath, cFilename )
LOCAL aRet     := {}
LOCAL nItem, ii,iMax
LOCAL objShell := CreateObject( "Shell.Application" )
LOCAL objFolder
LOCAL objFolderItem
LOCAL cFileInfo
LOCAL cHeaderInfo
LOCAL aItems := {176,178,175,177}

   objFolder := objShell:Namespace( cPath )
   objFolderItem := objFolder:ParseName( cFilename )
   iMax := LEN(aItems)
   FOR ii := 1 TO iMax
      nItem := aItems[ii]
      cFileInfo := objFolder:GetDetailsOf( objFolderItem, nItem )
      cHeaderInfo := objFolder:GetDetailsOf( objFolder:Items, nItem )
      IF !EMPTY( cHeaderInfo ) .AND. !EMPTY( cFileInfo )
         AADD( aRet, { STRZERO( nItem, 3 ), cHeaderInfo, STRTRAN( cFileInfo , "?", "" ) } )
      ENDIF
   NEXT

   objFolderItem := NIL
   objFolder := NIL
   objShell := NIL

RETURN ACLONE( aRet )