Determining the Location of a Share

Windows NT/Windows 2000

The following example demonstrates how to call the WNetGetUniversalName function to determine the location of a share on a redirected drive.

First the code sample calls the WNetGetUniversalName function, specifying the UNIVERSAL_NAME_INFO information level to retrieve a pointer to a Universal Naming Convention (UNC) name string for the resource. Then the sample calls WNetGetUniversalName a second time, specifying the REMOTE_NAME_INFO information level to retrieve two additional network connection information strings. If the calls are successful, the sample prints the location of the share.

To test the following code sample, perform the following steps:

1. Name the code sample GetUni.cpp.
2. Add the sample to a console application called GetUni.
3. Link the libraries Shell32.lib, Mpr.lib, and NetApi32.lib to the compiler list of libraries.
4. From the command prompt, change to the GetUni directory.
5. Compile GetUni.cpp.
6. Run the file GetUni.exe followed by a drive letter and colon, like this:

   GetUni H:\
   
   #define  STRICT
   #include <windows.h>
   #include <stdio.h>
   
   #define BUFFSIZE = 1000
   
   void main( int argc, char *argv[] )
   {
     DWORD cbBuff = 1000    // Size of Buffer
     TCHAR szBuff[1000];    // Buffer to receive information
     REMOTE_NAME_INFO  * prni = (REMOTE_NAME_INFO *)   &szBuff;
     // Pointers to head of buffer
     UNIVERSAL_NAME_INFO * puni = (UNIVERSAL_NAME_INFO *) &szBuff;
     DWORD res;
   
     if((argc < 2) | (lstrcmp(argv[1], "/?") == 0))
     {
       printf("Syntax:  GetUni DrivePathAndFilename\n"
            "Example: GetUni U:\\WINNT\\SYSTEM32\\WSOCK32.DLL\n");
       return;
     }
     
     // Call the WNetGetUniversalName function specifying the 
     //  UNIVERSAL_NAME_INFO_LEVEL option.
     //
     printf("Call WNetGetUniversalName using UNIVERSAL_NAME_INFO_LEVEL.\n");
     if((res = WNetGetUniversalName((LPTSTR)argv[1],
      UNIVERSAL_NAME_INFO_LEVEL,
      //
      //The structure is written to this block of memory.
      //
      (LPVOID) &szBuff, 
      &cbBuff)) != NO_ERROR) 
       //
       // If the call fails, print the error; otherwise, print 
       //  the location of the share, 
       //  using the pointer to UNIVERSAL_NAME_INFO_LEVEL.
       //
       printf("Error: %ld\n\n", res); 
      
   else
   printf("Universal Name: \t%s\n\n", 
   puni->lpUniversalName); 
     //
     // Call the WNetGetUniversalName function, 
     //  using the REMOTE_NAME_INFO_LEVEL option.
     //
     printf("Call WNetGetUniversalName using REMOTE_NAME_INFO_LEVEL.\n");
     if((res = WNetGetUniversalName((LPTSTR)argv[1], 
        REMOTE_NAME_INFO_LEVEL, 
           (LPVOID) &szBuff,    //Structure is written to this block of memory
          &cbBuff)) != NO_ERROR) 
       //
       // If the call fails, print the error; otherwise, print
       //  the location of the share, using 
       //  the pointer to REMOTE_NAME_INFO_LEVEL.
       //
       printf("Error: %ld\n", res); 
     else
       printf("Universal Name: \t%s\n" 
            "Connection Name:\t%s\n" 
          "Remaining Path: \t%s\n",
             prni->lpUniversalName, 
             prni->lpConnectionName, 
             prni->lpRemainingPath);
     return;
   }