Open a remote disk drive

I want to access a disk drive of a remote computer. is there any way i can do it? I am developing in VS2003 using VC++.  The function  CreateFile() can  open the disk drive of the local machine. I am not sure if the same function works for the remote disk drives too. Is there any function in VC++ that can do the same for the remote disk drives?
tariq6000Asked:
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yuy2002Commented:
Is the remote computer in the same lan network?If so , you can use disk map.
You can map the disk drive of remote computer to you local machine disk just as you have privilage to access the remote computer's disk.Then you could do evething on remote disk like the local disk.  
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evilrixSenior Software Engineer (Avast)Commented:
Can't you just mount it as a network drive or access it via UNC path?
\\<servername>\<sharename>\<directory>
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tariq6000Author Commented:
Yes, the remote disk is in the same LAN. But, I don't know how to map the remote disk on to the local machine. Can you please provide me a link to the sample code snippet illustrating on how it can be done?
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evilrixSenior Software Engineer (Avast)Commented:
Use the UNC path...

HANDLE CreateFile(
   "\\remotepc\sharename\myfile.txt",
   ... OTHER OPTIONS
);

...or mount it as a network drive and use it as if it was local: -

http://www.cs.umd.edu/faq/pc/map_network_drive/map_network_drive.html

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evilrixSenior Software Engineer (Avast)Commented:
Oops... I forgot the double slash for C-String...

CreateFile(
    "\\\\remotepc\\sharename\\myfile.txt",
    ... OTHER OPTIONS
);
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jkrCommented:
>>I don't know how to map the remote disk on to the local machine

That is done using 'WNetAddConnection2()', e.g.

#include <winnetwk.h>

    NETRESOURCE nr;

    ZeroMemory  (   &nr,    sizeof  (   NETRESOURCE));

    nr.dwType           =   RESOURCETYPE_DISK;
    nr.lpLocalName      =   "x:";
    nr.lpRemoteName     =   "\\\\theserver\\E$";

    //  authenticate server share using the remote user info
    dwRes   =   WNetAddConnection2  (   &nr,
                                       "SecretPassword",
                                       "UserName",
                                       0
                                   );

The above would map the drive as 'x:' (link with 'mpr.lib')
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itsmeandnobodyelseCommented:
You only can have access to a remote disk if there is a shared folder where you have access to.

Then you can map a free drive letter from the commandline by

  net use Z: \\server\share

If you don't have access either to 'server' or 'server\share' you'll get an appropriate error message. To see what driver letters are available you can type

   net use

and
 
  subst

These commands will show the dynamically defined drive letters either defined by 'net use' command or by 'subst' command. You have to add the local disk drive letters to get a full list.

Note, with 'net use' you only can map remote (folders of a) share using the UNC name.  With 'subst' you can map drive letters to any path using a local drive letter but not UNC paths. Also paths using driver letters defined with 'net use' can be used:

    net use K: \\my_server\my_share
    subst L: K:\any_path\any_folder

You can do all that programmatically by using the system function:

#include <process.h>

        int ret;
        if ((ret = system("net use K: \\\\my_server\\my_share")) != 0)
        {
               // error:  ret == 2 if path doesn't exist
        }

        if ((ret = system("subst L: K:\\any_path")) != 0)
        {
               // error:  ret == 2 if path doesn't exist
        }

The subst normally doesn't give an error when using an UNC name at the right side. But it will not work as a valid drive letter doing so.

You can check whether the 'subst' was successful by using the stat function:

#include <sys/stat.h>
#include <errno.h>

        ...
        if ((ret = system("subst L: K:\\any_path")) != 0)
        {
               // error:  ret == 2 if path doesn't exist
        }
         struct stat fs;
         if (stat("L:\\any_file_or_folder", &fs) != 0)
         {
               // errno will show the error code
         }  

Regards, Alex







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