Re: CopyFile across network / logon

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Chris P. [MVP] (msdn_at_chrisnet.net)
Date: 08/19/04 

Date: Thu, 19 Aug 2004 12:37:15 -0400

Chris P. [MVP] wrote:
> flox wrote:
>> Hi!
>>
>> I have a problem using CopyFile from one PC to another:
>>
>> I get a "unknown user..." error. Only after accessing the destination
>> PC using Explorer and entering user/password I can call CopyFile
>> without error. I am accessing W2K and NT workstations from a XP or
>> W2KTS system, there is NO logon box when my program calls CopyFile...
>>
>> This is ok as only authenticated users should be able to copy files
>> but using Explorer to enter user/password definitely is not a very
>> good solution...
>>
>> Unfortunately I CANNOT create the same users on both systems due to
>> security restrictions, but I have the user/password for the low
>> security systems I want to copy files to. The problem is that there
>> is no version of CopyFile taking user/password (of the remote machine
>> I want to copy to) what can I do?
>
> The thread that is going to do the copy can authenticate itself with
> the destination (server) using WNetAddConnection2() or equivilant.
> You can do it completely hidden from the user if you know the
> username and password at run time or you can prompt the user if
> necessary by using the CONNECT_INTERACTIVE flag. You don't need to
> map a local drive, set that field to NULL.
>
> Here's an example.

Sorry, hit the wrong key. Here's an example that assumes you know the
username and password:

char path[80];
 UINT error=0;
 NETRESOURCE nr;
 CString Password = password;

 memset(&nr, 0, sizeof(NETRESOURCE));

 if (*server_path)
  sprintf(path, "\\\\%s\\%s",server_name, server_path);
 else
  sprintf(path, "\\\\%s",server_name);

 nr.dwType = RESOURCETYPE_DISK;
 nr.lpLocalName = NULL;
 nr.lpRemoteName = path;
 nr.lpProvider = NULL;

//retryconnect:
 if (*username == 0)
 {
  if (*password == 0)
   error = WNetAddConnection2(&nr, NULL, NULL, 0);
  else
   error = WNetAddConnection2(&nr, Password, NULL, 0);
 }
 else
  error = WNetAddConnection2(&nr, Password, username, 0);

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