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BUG: WNetUseConnection Returns ERROR_ALREADY_ASSIGNED on Windows 2000

Article ID: 257298 - View products that this article applies to.

This article was previously published under Q257298

SYMPTOMS

On Windows 2000, a call to WNetUseConnection() with the lpLocalName member of NETRESOURCE structure set to "NULL" and dwFlags set to "CONNECT_REDIRECT" returns error 85, "ERROR_ALREADY_ASSIGNED". This also affects ShellExecuteEx() when used with the SEE_MASK_CONNECTNETDRV flag.

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CAUSE

The function is failing to choose the correct local device for redirection.

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RESOLUTION

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910

(http://support.microsoft.com/kb/260910/EN-US/ )

How to Obtain the Latest Windows 2000 Service Pack

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STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

This problem was first corrected in Windows 2000 Service Pack 1.

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MORE INFORMATION

According to the WNetUseConnection() documentation on the MSDN, if the CONNECT_REDIRECT value is set in the dwFlags parameter, and if lpLocalName is "NULL", the function should choose a local device to redirect and should return the name of the device in the lpAccessName parameter. But on Windows 2000, WNetUseConnection() fails with the error, "ERROR_ALREADY_ASSIGNED".

Steps to Reproduce Behavior

Use the following code snippet to reproduce the problem:

 #include <Windows.h>
 #include <stdio.h>
 #include <winnetwk.h>

int main(void)

{

   DWORD       nRet; 
   NETRESOURCE nr;
   LPTSTR      buff;
   DWORD       buffsize = 256;

   nr.lpLocalName  = NULL;
   nr.lpRemoteName = (LPSTR) GlobalAlloc(GPTR, 256);
   buff	           = (LPSTR) GlobalAlloc(GPTR, 256);

	
   nr.dwType = RESOURCETYPE_DISK;
   lstrcpy(nr.lpRemoteName, "\\\\mycomputer\\testshare");
   nr.lpProvider = NULL;


   nRet = WNetUseConnection(  NULL,
                              &nr,  //connection details 
                              NULL,
                              NULL, 
                              CONNECT_REDIRECT,  
                              buff,
                              &buffsize,
                              0
                               );

  if (nRet != 0)
      printf("Function returned error %d \n", nRet);
  else
 {
     printf("Function returned Successfully \n");
     printf("AccessName %s \n", buff);
 }
  return 0;
 
};

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