No way to call IDispatch.getIDsOfName about com4j HOT 5 CLOSED

I think this should be as simple as creating an IDispatch annotated interface (see http://com4j.java.net/annotations.html), and invoking the method on it. Since IDispatch is just a COM interface like any other I don't think COM4J itself needs to have any special support for this.

from com4j.

I started down that path:

@IID(IID.IDispatch)
public interface IDispatch extends Com4jObject
{
  @VTID(3)
  int getTypeInfoCount();

  @VTID(5)
  int getIDsOfName(Object riid, String[] names, int count, @LCID int lcid);
}

The getTypeInfoCount method works, but the getIDsOfName method does not. Is there a tlb, ocx or dll that I can generate this from? I searched google and my Windows system32 directory, but couldn't find anything. Otherwise some hints on what these methods need to look like would be appreciated.

from com4j.

I think you are on the right track, but your signature for getIDsOfName is wrong. If you read MSDN for that method, it expects a pointer to a caller allocated buffer that it will fill...so you need something like:

@VTID(5)
@returnvalue(type=NativeType.HRESULT)
int getIDsOfNames(Object riid, String[] names, int count, @LCid int lcid, ByteBuffer buffer);

Then when you call it you would pass a byte buffer of the correct size (names.length * 4) allocated with ByteBuffer.allocateDirect.

I think IDispatch may be defined in the stdole32.tlb, but I'm not sure.

While I was looking at the MSDN I also saw this note which seems like it applies to what you are trying to do:
Caution You cannot use this method to access values that have been added dynamically, such as values added through JavaScript. Instead, use the GetDispID of the IDispatchEx interface. For more information, see the IDispatchEx interface.

from com4j.

Ah, you are correct, IDispatchEx is a better choice. I am able to create a working com4j interface for IDispatchEx. Thanks for the help!

from com4j.

Hi @scheidh -- Would you mind sharing your annotated code for IDispatchEx? I'm trying to get make an annotated interface for vanilla IDispatch but I don't know what to do for the Invoke() method.

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