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make DLL

Little help needed.
Using  C++ 40  Win NT
Failure to build DLL file
----
#include <windows.h>
#include <ole2.h>
#include <sql.h>
#include <sqlext.h>

#ifdef _WIN32
  #define CCONV _stdcall
  #define NOMANGLE
#else
  #define CCONV FAR PASCAL _export
  #define NOMANGLE EXTERN_C
  #include <stdlib.h>
  #include <compobj.h>    
  #include <dispatch.h>
  #include <variant.h>
  #include <olenls.h>  
#endif

NOMANGLE LONG CCONV PassByte ()
{
RETCODE rs;
HENV henv;
rs=SQLAllocEnv(&henv);
rs=SQLFreeEnv(henv);
return      rs;
}
-----------------------------def, file
LIBRARY vb4dll

CODE      PRELOAD MOVEABLE DISCARDABLE
DATA      PRELOAD MOVEABLE

EXPORTS
      PassByte      @1
-----------
Error message LNK1141
Failure durning bulild of export file

Please give a clue.

mativare@i-2000.com
Please make corrections to code and post , then every
beginner(like me) can see it on a net.
Matt
0
mativare
Asked:
mativare
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1 Solution
 
msmitsCommented:
Is the file a .c file or a .cpp. When .cpp you must use:

extern "C" {
...
}

or just use a .c file.
This will disable the name mangling so the linker can find the right function.

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mativareAuthor Commented:
filenames were  vb4dll.c
and vb4dll.def
Unfortunately question remains unanswered.
Thanks  for a attempt.
Matthew
0
 
msmitsCommented:
except for the SQL stuff I could generate your DLL fine. I use Borland C++ 5.02 on win95 at the moment.

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navigator010897Commented:
Um,
you have a real strange problem.

I just compiled your dll, the .cpp and the .def file on MSVC++ 4.0 Standard on Win95 and if compiled flawlessly.  

Perhaps you set up the project wrong, and instead of just a pure dll you set up an app wizard mfc dll?  Or maybe perhaps you didn't do a full install with msvc and are missing some of the header files needed for the ole/sql?
0
 
mativareAuthor Commented:
I used "pure dll Option". It compiled too, but building(linking) went wrong
Messages LNK 4044, LNK1181,  LNK1141
Still hoping
Matthew
0
 
navigator010897Commented:
Are you sure you included all of the database support options when you installed MSVC 4.0?  It seems very odd that you are having this trouble, as I said, I just cut and pasted your code, and it worked flawlessly...
0
 
Seeker092397Commented:
Along with LNK1181 error must come a name of a file linker could not find. What is it?
0
 
mativareAuthor Commented:
fatal error LNK1181: cannot open input file "Files\DevStudio\BIN\link.exe"
Good man you solved it, because my Dev Studio is located in
"Program Files."
Seems I need to do reinstallment of VC++, if you have any other hints
how to "tell" compiler where are files, let me know.
 I know there are files  like
setup .ini and...
Thanks a lot.
Matt
Matthew


0
 
Seeker092397Commented:
I am glad I helped You. If You'd be so kind, please transfer me the value of the answer. Thanx.
0

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