Accessing a 32-bit COM DLL via 64-bit Java Application

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  I'm trying to call CoCreateInstance(...) via a 64-bit Java library: org.eclipse.swt.internal.ole.win32.COM. The DLL I'm trying to hook into is a DLL for Visual SourceSafe. The point of the project is to port a VSS plugin (http://sourceforge.net/projects/vssplugin/) made for 32-bit Eclipse to 64-bit Eclipse.

  The call works fine when I use the 64-bit version of org.eclipse.swt.internal.ole.win32.COM, but with the 32-bit version, the call fails. The call is being used like this:

      private void init(GUID guid) {
          long[] ppv = new long[1];
          int result = <span style="text-decoration:underline">COM.CoCreateInstance(guid, 0, COM.CLSCTX_INPROC_HANDLER | COM.CLSCTX_INPROC_SERVER | COM.CLSCTX_LOCAL_SERVER,
                  COM.IIDIDispatch, ppv)</span>;
          if (result != COM.S_OK)
              OLE.error(OLE.ERROR_CANNOT_CREATE_OBJECT, result);
          init(new OleAutomation(new IDispatch(ppv[0])));
      }
  

  
  The call fails and returns -2147221164, which I guess is some kind of error code specifying that the corresponding registry entry can't be found.

  Some things I've tried include:

  • This registry hack: http://www.gfi.com/blog/32bit-object-64bit-environment/
  • Unregistering/Registering the DLL with 32-bit and 64-bit versions of regsvr32.exe

  Does anyone have advice on this?

  • Moved by Jie Bao Thursday, January 5, 2012 8:12 AM (From:Application Compatibility for Windows Desktop Development)

  Wednesday, December 28, 2011 4:58 PM