Delphi code to get Owner of a Netware file not working - delphi

Question

I'm a Delphi developer and have never programmed for netware. But I need to find the owner of a file on a netware share. After some research, I got this code snippet from a newsgroup (original author: Chris Morgan). It's basically a way to dynamically load netware dll and get the "owner" information of a file. Please look at the function GetNetwareFileOwner.
The problem is, I don't have direct access to a netware share for testing. I'm sending a small test program every time to a user who tests it by selecting a file on the netware share and then reports the results. I'm getting the error code by a small code insert after the call NWIntScanExtenedInfo where it fails with the error codes given below. Any ideas what can be wrong?
Error codes:
1) At first, the following code gave error 899E (INVALID_FILENAME) on the above call. The file name was in English--no special characters there. And the file was selected on the share with a regular File Open dialog.
2) After that, suspecting a case problem, I commented the two AnsiUpperCase lines to keep the name in original case exactly as the File Open Dialog received it. This gives the error 89FF now (NO_FILES_FOUND_ERROR).
P.S. I compiled the test with Delphi 2007. May be there is a structure problem of the top structure. I haven't checked the byte length and alignment. Will do so.
// netware records and function definitions
type
// sizeof(NW_EXT_FILE_INFO) should be 140 bytes - check byte alignment
NW_EXT_FILE_INFO = record
sequence: integer;
parent: integer;
attributes: integer;
uniqueID: shortint;
flags: shortint;
nameSpace: shortint;
nameLength: shortint;
name: array[0..11] of shortint;
creationDateAndTime: integer;
ownerID: integer;
lastArchiveDateAndTime: integer;
lastArchiverID: integer;
updateDateAndTime: integer;
lastUpdatorID: integer;
dataForkSize: integer;
dataForkFirstFAT: integer;
nextTrusteeEntry: integer;
reserved: array[0..35] of shortint;
inheritedRightsMask: word;
lastAccessDate: word;
deletedFileTime: integer;
deletedDateAndTime: integer;
deletorID: integer;
reserved2: array[0..15] of shortint;
otherForkSize: array[0..1] of integer;
end;
// functions defined in CALWIN32.DLL
TNWCallsInit = function(reserved1: pointer;
reserved2: pointer): integer; stdcall;
TNWCallsTerm = function(reserved: pointer): integer; stdcall;
TNWParseNetWarePath = function(const path: pchar; var conn: cardinal;
var dirhandle: cardinal; newpath: pchar): integer; stdcall;
TNWAllocTemporaryDirectoryHandle = function(conn: cardinal;
dirhandle: cardinal; const path: pchar; var newdirhandle: cardinal;
rightsmask: pshortint): integer; stdcall;
TNWDeallocateDirectoryHandle = function(conn: cardinal;
dirhandle: cardinal): integer; stdcall;
TNWIntScanExtendedInfo = function(conn: cardinal; dirhandle: cardinal;
attrs: shortint; iterhandle: Pinteger; const searchPattern: pchar;
var entryinfo: NW_EXT_FILE_INFO; augmentflag: shortint): integer;
stdcall;
TNWGetObjectName = function(conn: cardinal; objID: integer;
objname: pchar; objtype: pword): integer; stdcall;
const
FA_NORMAL = $00;
FA_HIDDEN = $02;
FA_SYSTEM = $04;
// return codes
SUCCESSFUL = $00;
NOT_MY_RESOURCE = $883C;
// get file owner for Netware server file
function GetNetwareFileOwner(const FilePath: string): string;
var
hcalwin: HINST;
NWCallsInit: TNWCallsInit;
NWParseNetWarePath: TNWParseNetWarePath;
NWAllocTemporaryDirectoryHandle: TNWAllocTemporaryDirectoryHandle;
NWIntScanExtendedInfo: TNWIntScanExtendedInfo;
NWGetObjectName: TNWGetObjectName;
NWDeallocateDirectoryHandle: TNWDeallocateDirectoryHandle;
NWCallsTerm: TNWCallsTerm;
hconn,
hdir,
retcode: cardinal;
filedir: string; { DOS path of parent folder
(upper case) }
nwfilename: string; { DOS filename (upper case) }
nwfiledir: array[0..255] of char; { Netware path of
parent folder }
rights: shortint;
i: integer;
entryinfo: NW_EXT_FILE_INFO;
objtype: word;
begin
Result := '';
// load netware client library and required functions
hcalwin := LoadLibrary('calwin32.dll');
if hcalwin<=0 then exit; // netware client not present on PC
#NWCallsInit := GetProcAddress(hcalwin,'NWCallsInit');
#NWParseNetWarePath := GetProcAddress(hcalwin,'NWParseNetWarePath');
#NWAllocTemporaryDirectoryHandle := GetProcAddress(hcalwin,
'NWAllocTemporaryDirectoryHandle');
#NWIntScanExtendedInfo :=
GetProcAddress(hcalwin,'NWIntScanExtendedInfo');
#NWGetObjectName := GetProcAddress(hcalwin,'NWGetObjectName');
#NWDeallocateDirectoryHandle := GetProcAddress(hcalwin,
'NWDeallocateDirectoryHandle');
#NWCallsTerm := GetProcAddress(hcalwin,'NWCallsTerm');
// initialise netware libs
if NWCallsInit(nil,nil)<>SUCCESSFUL then exit;
try
filedir := AnsiUpperCase(ExtractFileDir(FilePath));
retcode := NWParseNetWarePath(pchar(filedir),hconn,hdir,nwfiledir);
if retcode=NOT_MY_RESOURCE then exit; // local or non-netware disk
// get a dir handle
NWAllocTemporaryDirectoryHandle(hconn,0,nwfiledir,hdir,#rights);
// get the file info
i := -1;
nwfilename := AnsiUpperCase(ExtractFileName(FilePath));
retcode := NWIntScanExtendedInfo(hconn,hdir,
FA_NORMAL+FA_SYSTEM+FA_HIDDEN,
#i,pchar(nwfilename),entryinfo,0);
if retcode=SUCCESSFUL then begin
// get file owner name from ID
SetLength(Result,MAX_PATH);
retcode := NWGetObjectName(hconn,entryinfo.ownerID,
pchar(Result),#objtype);
if retcode=SUCCESSFUL then
SetLength(Result,Length(Result)) // got owner
else SetLength(Result,0); // failed to get owner
end;
// deallocate dir handle
NWDeallocateDirectoryHandle(hconn,hdir);
finally
// clean up
NWCallsTerm(nil);
FreeLibrary(hcalwin);
end;
end;

Answer 1

Are you sure about stdcall? Tru cdecl and so on.
Also, You done give information about delphi's version.
If you use a version BEFORE delphi2009 pchar is a one-byte char.
But if you use delphi2009 or next, pchar is 2 byte char.
So, if you need one byte char you must use PAnsiChar insthead.
I don't know if netware dll parameters are unicode or ansi...
Cher.
A.