🚀 go-pugleaf

Hello all vdbase programmers,
I try to access a TWAIN-compatible scanner from vdbase 5.5, using the
EXTERNal DLL EZTWAIN 1.06 and 1.07, but getting problems by passing
the filename to one of it's functions. All other functions are working
well.
The code I tried:

*******************************************************************************

EXTERN CINT TWAIN_AcquireToFilename( CHANDLE, CSTRING ) EZTWAIN.DLL
EXTERN CINT MessageBox( CHANDLE, CSTRING, CSTRING, CWORD) USER.EXE

      tempfile = "SCANTEMP.BMP"
      MessageBox( 0, "This file will be created", tempfile, 0 )
      scanres = TWAIN_AcquireToFilename( 0, tempfile )
      if scanres > 0                              && (will always fail
with -2 = illegal filename)
*******************************************************************************

Visual dBASE uses:
 - pascal calling convention
 - 16bit DLLs only
 - CHANDLE = 16bit WORD
 - CSTRING = zero terminated char far *
So everything should be OK...

The problem on this:
The external Windows DLL-Func "MessageBox" works OK, but the EZTWAIN
DLL-Func "TWAIN_AcquireToFileName" seems to misunderstand the filename
and uses garbage-strings (or NULL or empty) instead and so fails to
create the file...

Has anyone experiences with EZTWAIN.DLL and vdbase and could me give
some hints
how to get this working???
Thanks in advance
Ruediger Spindler