I believe your declaration for WNetEnumResource is wrong: The MSDN declares it as

DWORD WNetEnumResource(
  HANDLE hEnum,
  LPDWORD lpcCount,
  LPVOID lpBuffer,
  LPDWORD lpBufferSize
);

[download]

which I interpret as LPPP and not as PPPP. Try it with the following code:

my $WNetEnumResource= new Win32::API ("mpr", "WNetEnumResource", "VPPP
+", "I") or die;
my $count= pack ("V", -1);
my $bufsize= 5000;
$buffer= 'x' x (1+$bufsize);
for (;;) {
   $bufsize= pack ("V", 5000);
   $result= $WNetEnumResource->Call ($handle, $count, $buffer, $bufsiz
+e);
   print "result for WNetEnumResource is $result\n";
   last if $result != 0;
   print "count=$count, bufsize=$bufsize\n";
   print $buffer;  # just to see if it's not all x's.
   }

[download]

Updated: The prototype should have been LPPP, and not VPPP

In reply to Re: Passing/Returning HANDLE's with Win32::API by Corion
in thread Passing/Returning HANDLE's with Win32::API by John M. Dlugosz

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