Problem with CloseFile

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Hi All,

I do have
such a basic problem with CloseFile that I know, I must do something wrong. After
trying all possible changes I’m lost and I would try to ask for help.

I use
PowerBasic Vers. 10.04, PDF-Library Vers. 13.12

FUNCTION PBMAIN () AS LONG

LOCAL oLib                                    AS IDISPATCH

LOCAL
hPdf, lResult, lPageCount               AS LONG

LOCAL wLib,
wPassword, wPageText, wClsId,     AS WSTRING

wLib       = EXE.PATH$ +
"DebenuPDFLibraryAX1312.dll"

wClsId     = GUID$("{6393DAEA-334E-4410-9582-5BE46DC383C2}")      'Version 13.12

vUnlockKey
= “your key goes here”

oLib =
NEWCOM CLSID wClsId LIB wLib                               'yes,
works

OBJECT
CALL oLib.UnlockKey(vUnlockKey) TO lResult                 'yes,
works

OBJECT
CALL oLib.LoadFromFile(wPdfFile, wPassword) TO hPdf ‘yes, works

'…..   Some more functions or even nothing (doesn’t
matter!)

'i.e.  OBJECT CALL oLib.PageCount() TO lPageCount                 'yes, works

OBJECT
CALL oLib.CloseFile(hPdf)  TO
lResult                      'NO gives Object Error 
OBJECT CALL
oLib.ReleaseLibrary() TO lResult               
      'ERROR:

'if you
don’t do a CloseFile it gives you identical Object Error with ReleaseLibrary

END FUNCTION

If I do the
same functions with direct library calls (= none ActiveX Functions), I get read
or write to invalid address errors on CloseFile.

I tried
everything I could think about to declare vars as Variant as DWords as WStringsZ,
but the error still remains.

I hope
somebody would see what I did wrong.

Cheers,
George

PS: already did send the problem to support, but no reaction since last week

Edited by GeorgeS - 04 Jul 17 at 11:33AM

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
GeorgeS Members Profile Find Members Posts Beginner Joined: 04 Jul 17 Location: Germany Status: Offline Points: 3	Post Options Post Reply Quote GeorgeS Report Post Thanks(0) Quote Reply Topic: Problem with CloseFile Posted: 04 Jul 17 at 11:18AM
	Hi All, I do have such a basic problem with CloseFile that I know, I must do something wrong. After trying all possible changes I’m lost and I would try to ask for help. I use PowerBasic Vers. 10.04, PDF-Library Vers. 13.12 FUNCTION PBMAIN () AS LONG LOCAL oLib AS IDISPATCH LOCAL hPdf, lResult, lPageCount AS LONG LOCAL wLib, wPassword, wPageText, wClsId, AS WSTRING wLib = EXE.PATH$ + "DebenuPDFLibraryAX1312.dll" wClsId = GUID$("{6393DAEA-334E-4410-9582-5BE46DC383C2}") 'Version 13.12 vUnlockKey = “your key goes here” oLib = NEWCOM CLSID wClsId LIB wLib 'yes, works OBJECT CALL oLib.UnlockKey(vUnlockKey) TO lResult 'yes, works OBJECT CALL oLib.LoadFromFile(wPdfFile, wPassword) TO hPdf ‘yes, works '….. Some more functions or even nothing (doesn’t matter!) 'i.e. OBJECT CALL oLib.PageCount() TO lPageCount 'yes, works OBJECT CALL oLib.CloseFile(hPdf) TO lResult 'NO gives Object Error OBJECT CALL oLib.ReleaseLibrary() TO lResult 'ERROR: 'if you don’t do a CloseFile it gives you identical Object Error with ReleaseLibrary END FUNCTION If I do the same functions with direct library calls (= none ActiveX Functions), I get read or write to invalid address errors on CloseFile. I tried everything I could think about to declare vars as Variant as DWords as WStringsZ, but the error still remains. I hope somebody would see what I did wrong. Cheers, George PS: already did send the problem to support, but no reaction since last week Edited by GeorgeS - 04 Jul 17 at 11:33AM

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3529	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 11 Jul 17 at 8:45PM
	Hi George, i think you have to do the "Free" first, before your CloseFile ... This is how i would do it (Delphi): QP := TDebenuPDFLibrary1211.Create; try QP.LoadFromFile(Edit1.Text, ''); If ( QP.EncryptionStatus > 0 ) Then QP.Decrypt; // . . . Save_Cursor := Screen.Cursor; Screen.Cursor := crHourglass; { Show hourglass cursor } // Some file processing ... QP.SaveImageListItemDataToFile(...); // . . . finally Screen.Cursor := Save_Cursor; QP.Free; // Starting from here with your CloseFile... end; Cheers and welcome here, Ingo
	Cheers, Ingo

tfrost Members Profile Find Members Posts Senior Member Joined: 06 Sep 10 Location: UK Status: Offline Points: 437	Post Options Post Reply Quote tfrost Report Post Thanks(0) Quote Reply Posted: 12 Jul 17 at 11:39AM
	I hate to disagree with Ingo, and I know less than zero about PowerBasic. But why are you calling a non-existent QPDF function named CloseFile at all? LoadFromFile returns a 0 or 1 result code, not a handle; and the PDF file is already closed by this function, so no close is needed. There is no CloseFile or ReleaseLibrary function in QPDF, and this may be why they both return an error.

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3529	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 12 Jul 17 at 8:38PM
	Hi TFrost, i know that the functions are not from inside QuickPDF ;-) From my opinion the prob exists cause CloseFile can't get control on the file cause the file is still under control of QuickPDF. The Free from QuickPDF frees the instance and the file and after this CloseFile should work. But i think you're right that it's not necessary ;-)
	Cheers, Ingo

tfrost Members Profile Find Members Posts Senior Member Joined: 06 Sep 10 Location: UK Status: Offline Points: 437	Post Options Post Reply Quote tfrost Report Post Thanks(0) Quote Reply Posted: 13 Jul 17 at 11:30PM
	The PowerBasic syntax is unfamiliar to me, but my point was that if olib.LoadFromFile 'works' and olib.PageCount 'works' (because both are QPDF functions) then 'olib' seems to be analogous to what I know as 'qpdf'. Given this fact, olib.CloseFile and olib.ReleaseLibrary are never going to be successful calls (unless 'olib' magically has two meanings at once). We agree that the functions are not QPDF functions, so how can they be called as methods of 'olib'?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3529	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 14 Jul 17 at 9:12AM
	Hi :) it seems to me that you're right ;-) I didn't see these "olib" - so this syntax from George have to be wrong. I'm not familiar with PowerBasic but with the knowing we have now i would try CloseFile with "wlib"? Anyway... i'm pretty sure that George is on the right way now...
	Cheers, Ingo

GeorgeS Members Profile Find Members Posts Beginner Joined: 04 Jul 17 Location: Germany Status: Offline Points: 3	Post Options Post Reply Quote GeorgeS Report Post Thanks(0) Quote Reply Posted: 15 Jul 17 at 8:38AM
	Thank you for your response and help. You are right, CloseFile and ReleaseLibrary don't exist in the ActiveX version of the QuickPDF Lib. In the DLL-version of the library, there exists the ReleaseLibrary function. Within the ActiveX version this function does not exist. As Ingo mentioned releasing the instance is just enough. CloseFile is only used for the direct access file function and have to be used as oLib.DACloseFile(hPDF) after a DAOpenFile. If I do it this way, everything works fine! Problem solved. @tfrost You are right, LoadFile returns a result code. DAOpenFile returns a handle that I can close with DACloseFile. Just as Info: oLib is a name I used as object name. You can name it “qpdf”, “QuickPDF” or almost anything you like in the line: qPdf = NEWCOM CLSID wClsId LIB wLib In the way I have declared the QuickPDF library, I don’t have to register the library. The DLL just has to be in the application directory or within the system search path. Cheers, George