undefined reference

[Gunther Ebert]

Tim Newsham wrote:
> 
> Hi,
> 
>    I found a reference to a function named "NetEnumerateTrustedDomains"
> and wanted to use it.  I found it listed in the microsoft headers
> in <LMACCESS.H> as:
> 
>     NTSTATUS
>     NetEnumerateTrustedDomains (
>         IN LPWSTR ServerName OPTIONAL,
>         OUT LPWSTR *DomainNames
>         );
> 
> so I made a test case using:
> 
>     #include <windows.h>
> 
>     DWORD STDCALL NetEnumerateTrustedDomains(LPWSTR, LPWSTR *);
>     [... some code ...]
> 
> but when I went to link it I got an unresolved error:
> 
>     C:\TEMP\cc0010491.o(.text+0x36):doms.c: undefined
>     reference to `NetEnumerateTrustedDomains@8'
> 
> so I checked through the libnetapi32.a and found it missing:
> 
>     % nm libnetapi32.a |grep NetEnum
>     [nothing]
>

It is really not there. You will either have to build a new import library
for netapi32.dll. Look for netapi32.def in the CDK source tree (winsup/sysdef I believe)
and add a line 

NetEnumerateTrustedDomains@8

without any @xx stuff. If the other function names in the netapi32.def file
have preceding underscores add one also the new line.

Build the import library by executing dlltool:

dlltool -k --dllname netapi32.dll --output-lib libnetapi32.a --def netapi32.def

If the functions names in netapi32.def have preceding underscores add
the '-U' option to the dlltool command line.


> If I look at the netapi32.dll in quikview, its in there:
> 
>     Export Table
>     Ordinal  Entry Point  Name
>     0044     00010786     NetEnumerateTrustedDomains
> 
> So the questions
> 
>   - why isnt this function in the generated .a?

It has probably been forgotten, perhaps because this function isn't documented
at least in the MSDN library.

>   - how is it decided which functions are put into the generated .a's?

One has to write the import definition files manually.

>   - can I call this function without building a new .a?  or can
>     I generate a minimal .a that will let me call this function?

I think it doesn't make much sense to create a new minimal import library
for just one function. Create a new libnetapi32.a library instead.
However, you can call this function also without creating a new import library
(error checking code omitted):

typedef DWORD STDCALL (*fntype)(LPWSTR, LPWSTR *);

void foo(LPWSTR servername, LPWSTR *domains)
{
  HANDLE hNetApiDLL = LoadLibrary("netapi32.dll");
  fntype fptr = (fntype)
	GetProcAddress(hNetApiDLL, "NetEnumerateTrustedDomains");

  (*fptr)(servername, domains);
}

>   - how can I make a new libnetapi32.a that has this function referenced?

described above

> 
>                                           Tim N.
> 
> -
> For help on using this list (especially unsubscribing), send a message to
> "gnu-win32-request@cygnus.com" with one line of text: "help".

-- 

Gunther Ebert
iXOS Anwendungs-Software GmbH
Angerstrasse 40-42
D-04177 Leipzig

Phone : +49 341 48503-0
Fax   : +49 341 48503-99
E-mail: mailto:gunther.ebert@ixos-leipzig.de
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