Mpr.dll - WNetAddConnection2: ERROR_BAD_NET_NAME (67)

[Bernd Bartke]

Hi,

I'm having troubles in getting Windows API Call WNetAddConnection2 to Mpr.dll to work. Hopefully somebody might show me what I'm doing wrong or I'm missing ...

On Windows 7, 64-Bit, behaviour of MprTest in a 32-Bit JVM (1.7.0_45, 1.6.0_41) is differing from execution in a 64-Bit JVM (1.7.0_25, 1.6.0_41):

On a 32-Bit JVM the return value will always be 67 (ERROR_BAD_NET_NAME), even when I'm completely sure, that lpRemoteName is a correct UNC path to an existing and reachable share. 

On a 64-Bit JVM the return value will always be 0 (ERROR_SUCCESS). Great! But unfortunately no connection is established. It seems like the value of lpRemoteName - is ignored: Even when providing a nonsense value for lpRemoteName the return value will always be 0.

Unfortunately I can not see the mistake in my implemenation. 

32-Bit JVM: java version "1.7.0_45", Java HotSpot(TM) Client VM (build 24.45-b08, mixed mode, sharing)

(Platform.RESOURCE_PREFIX=win32-x86, Kernel32.GetNativeSystemInfo(lpSystemInfo): lpSystemInfo.processorArchitecture.pi.wProcessorArchitecture=0 (x86))

Mounting Windows Share [\\hostname\share] [userName] ...

Mounting Windows Share: 67 (ERROR_BAD_NET_NAME)

64-Bit JVM: java version "1.7.0_25", Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)

(Platform.RESOURCE_PREFIX=win32-x86-64, Kernel32.GetNativeSystemInfo(lpSystemInfo): lpSystemInfo.processorArchitecture.pi.wProcessorArchitecture=0 (x86))

Mounting Windows Share [\\hostname\share] [userName] ...

Mounting Windows Share: 0 (ERROR_SUCCESS)

Besides I'm wondering why Kernel32.GetNativeSystemInfo will always return a ProcessorArchitecture of 0 (x86) on 32-Bit and on a 64-Bit JVM. I would expect 9 (x64 (AMD or Intel)) on a 64-Bit JVM. Maybe somebody may explain it to me...

Mpr.java

import com.sun.jna.Native;

import com.sun.jna.platform.win32.WinNT;

import com.sun.jna.win32.W32APIOptions;

public interface Mpr extends WinNT

{

  Mpr INSTANCE = (Mpr)Native.loadLibrary("Mpr", Mpr.class, W32APIOptions.UNICODE_OPTIONS);

  /**

   * http://msdn.microsoft.com/en-us/library/windows/desktop/aa385413(v=vs.85).aspx

   * ...

   */

  public int WNetAddConnection2(NETRESOURCE lpNetResource, String lpPassword, String lpUserName, int dwFlags);

}

NETRESOURCE.java

import com.sun.jna.Structure;

/**

 * http://msdn.microsoft.com/en-us/library/windows/desktop/aa385353(v=vs.85).aspx

 */

public class NETRESOURCE extends Structure

{

  public static final java.util.List<String> fieldOrder = java.util.Arrays.asList(new String[]

  {

    "dwScope",

    "dwType",

    "dwDisplayType",

    "dwUsage",

    "lpLocalName",

    "lpRemoteName",

    "lpComment",

    "lpProvider"

  });

  public int dwScope;

  public int dwType;

  public int dwDisplayType;

  public int dwUsage;

  public String lpLocalName;

  public String lpRemoteName;

  public String lpComment;

  public String lpProvider;

  @Override

  protected java.util.List getFieldOrder()

  {

    return fieldOrder;

  }

}

MprTest.java

import org.junit.Test;

public class MprTest

{

  public static final int RESOURCETYPE_DISK  = 0x00000001;

  public static final int RESOURCEDISPLAYTYPE_SHARE = 0x00000003;

  public static final int RESOURCEUSAGE_CONNECTABLE = 0x00000001;

  @Test

  public void testMpr() throws Exception

  {

    NETRESOURCE lpNetResource;

    String lpPassword, lpUserName;

    int dwFlags;

    int errorCode;

    lpNetResource = new NETRESOURCE();

    lpNetResource.dwScope = 0;

    lpNetResource.dwType = RESOURCETYPE_DISK;

    lpNetResource.dwDisplayType = RESOURCEDISPLAYTYPE_SHARE;

    lpNetResource.dwUsage = RESOURCEUSAGE_CONNECTABLE;

    lpNetResource.lpLocalName = null;

    lpNetResource.lpRemoteName = "\\\\hostname\\share";

    lpNetResource.lpComment = null;

    lpNetResource.lpProvider = null;

    lpPassword = "password";

    lpUserName = "userName";

    dwFlags = 0;

    System.out.println("Mounting Windows Share [" + lpNetResource.lpRemoteName + "] [" + lpUserName + "] ...");

    errorCode = Mpr.INSTANCE.WNetAddConnection2(lpNetResource, lpPassword, lpUserName, dwFlags);

    System.out.println("Mounting Windows Share: " + errorCode);

  } 

}

Thanks in advance!