LoadLibraries returning 0 in installed end-user application

platform:  Raster Imaging library (MFC/MS C++/MSVS2000) on Microsoft Windows 2000 SP4

I have an installer that installs an end-user application plus the required LEAD libraries into a folder on a target machine. This machine does not have the LEADTools developer kit installed.

The call to LoadLibraries(...) is returning 0, yet the libraries in question are right there in the directory with the executable application.  Downstream I get an error -1046 "WRPERR_LTTWN_NOT_LOADED"

(1) where can I get additional diagnostic error information to uncover the underlying problem?

(2) why would LoadLibraries return 0?

(3) are there any other steps needed to deploy an application that uses Raster Imaging functionality:

-> TWAIN
-> Image/bitmap display in TIF/JPG
-> ImageList control
-> Image rotation

I include the following libraries (DLLs) with my application:

LTKRN14N
LTDIS14N
LTTWN14N
LTFIL14N
LTLST14N
LTWVC14N

The call to LoadLibraries looks like:

const L_UINT32 cLeadLibraries = LT_KRN | LT_TWN | LT_DIS | LT_FIL | LT_LST;
...
L_UINT32 result = LBase::LoadLibraries(cLeadLibraries);
[--> returns 0]
...
WRPUNLOCKSUPPORT();

Thanks

John Jamison

Will gather that data tomorrow.

Development machine works perfectly fine.

I have 14.5 with the service pack/patch applied. (14.5.0.10). 

-John Jamison

All calls to LoadLibraries return 0

I already tried that.  Still returns 0.  I also tried putting the dlls in the windows system32 folder, which was also in the PATH.

Also, before you ask, I created an installer project for the LEAD tools Twain demo sample.  I modified the project to work with visual studio 2003 and made the following changes:

1) added the lead tools LIB directory as an "Additional Library Directory"  (Project Properties->Linker->General pane)
2) added ltwvc_n.lib as an additional dependency (Project Properties->Linker->Input pane
3) I removed the automatically added "Detected dependency" of ltwvc14n.dll (from %SystemRoot%\system32) and added files %LeadRoot%\redist\ltwvc14n.dll and \redist\lttwn14n.dll to the installer
4) build the installer, copied the folder to my target windows 2000 computer (lead tools development sdk not installed)
5) installed the application.  In the application folder are the following:

CLTWNDemo32.exe
lttwn14n.dll
ltwvc14n.dll
mfc71d.dll
msvcr71d.dll

When I run cltwndemo32.exe, LoadLibraries is called with LT_ALL_LEADLIB and returns 0.  Even if other lead tools libraries are required, the call to loadlibraries is supposed to return an indicator of which libraries were loaded successfully. Since it returns zero, it isn't loading any libraries.  Same as my end user application which attempts to load 5 lead tools libraries.

The PATH variable includes a folder that contains the lttwn14n and ltwvc14n dlls (and others).

Anyone else successful deploying an end-user application for Windows 2000 SP4?  This is quite mystefying

Most of the libraries you list, with the exception of the lt*.dll (lead tools) libraries are in %SystemRoot%\system32

The only exceptions are:
pixdfltn.dll
pixlocn.dll
pixpermn.dll

I only deployed the leadtools libraries pertinent to my application. In any case, even if I were missing one leadtools library, I would expect the others to load successfully.  Unless you can confirm with the developer(s) that any one particular leadtools library missing from an application folder or PATH folder would cause LoadLibraries to return 0 for any LeadTools library.

Surely other people have deployed end user applications (Raster Imaging library), built with C++.  Is there a problem with compatibility with Visual Studio .Net 2003?  I sure hope not...

John Jamison

This seems to be a flaw in previous builds of our library. 
Through emails at support@leadtools.com we resolved this issue by using build 14.5.0.18.


If you are experiencing this same issue make sure your DLLs are at
least build 14.5.0.18.  If so and the issue persist email support@leadtools.com with your issue.

Heya, I looked at the patches and the highest version there is 4.5.0.16.  I am alos having issues registering these DLL's.  How do I get the latest version of the Dll's and how robust are they?

Unfortunately it appears to not have solved the problem.  I wrote a simple Test MFC app. All it does is call LoadLibraries on Kernel and Twain

The installation folder has
LeadTest.exe
ltwvc14n.dll  (14.5.0.18)
ltkrn14n.dll   (14.5.0.18)
lttwn14n.dll   (14.5.0.18)
MFC and VS CRT libraries

The target system is a Windows 2000 server having never had Lead tools SDK or demo installed.  I have another Win2000 system that does not have the SDK installed but for which the problem went away using the 0.18 libraries. I can't explain it...

LoadLibraries returns 0 for each call (LT_KRN and LT_TWN)
------------------------------------
   L_UINT32 nRet = LBase::LoadLibraries(LT_KRN);
   if (nRet==0)
       ::MessageBox(NULL,_T("LoadLibraries(LT_KRN) failed."),"Error",MB_ICONERROR | MB_OK);

   nRet = LBase::LoadLibraries(LT_TWN);
   if (nRet==0)
       ::MessageBox(NULL,_T("LoadLibraries(LT_TWN) failed."), NULL, MB_ICONERROR | MB_OK);
--------------------------------------

-John Jamison

I receive the same error if I do not have LTKRN14n.dll deployed.  If I have LTKRN14n.dll deployed the error goes away.  Please make sure you have LTKRN14n.dll copied onto the deployed machine.