Help with Eclipse SWT - OLE plugin

[nmarathe]

Hello Everybody,

I am trying to embed an word document using the eclipse plugin org.eclipse.swt.win32.win32.x86_3.3.0.v3346. I want to catch the events such as DocumentChange which are defined in the interface IApplicationEvents4 in the MS Word.

I have written the following code to do the same


private void openDocument(String doc)
{
if (site != null && !site.isDisposed())
site.dispose();
file = new File(doc);

site = new OleClientSite(frame, SWT.EMBEDDED,file);
site.doVerb(OLE.OLEIVERB_INPLACEACTIVATE);


IUnknown objIUnknown = getDispPtr(site);

if (objIUnknown != null)
{
GUID IIDIAppEvents = IIDFromString("{00020A01-0000-0000-C000-000000000046}");
//GUID IAppEvents = IIDFromString("{000209FE-0000-0000-C000-000000000046}");
//GUID IIDIAppEvents = IIDFromString("{00020A00-0000-0000-C000-000000000046}");

int[] ppvObject = new int[1];
if (objIUnknown.QueryInterface(COM.IIDIConnectionPoin tContainer, ppvObject) == COM.S_OK) {
IConnectionPointContainer cpc = new IConnectionPointContainer(ppvObject[0]);
int[] ppCP = new int[1];
if (cpc.FindConnectionPoint(IIDIAppEvents, ppCP) == COM.S_OK) {
IConnectionPoint cp = new IConnectionPoint(ppCP[0]);
/*int[] pCookie = new int[1];
if (cp.Advise(iDispatch.getAddress(), pCookie) == COM.S_OK)
eventCookie = pCookie[0];*/
cp.Release();
}
cpc.Release();
}

}
}

private GUID IIDFromString(String lpsz)
{
int length = lpsz.length();
char[] buffer = new char[length + 1];
lpsz.getChars(0, length, buffer, 0);
GUID lpiid = new GUID();
if (COM.IIDFromString(buffer, lpiid) == COM.S_OK) return lpiid;
return null;
}

/**
* @param args
*/
public static void main(String[] args) {

OleTest te = new OleTest();
te.startShell();
}

private IUnknown getDispPtr(OleClientSite site)
{
Variant var = null;
try
{
OleAutomation automation = new OleAutomation(site);
var = new Variant(automation);
return var.getUnknown();
}
catch (Exception e)
{
return null;
}
}

The call if (cpc.FindConnectionPoint(IIDIAppEvents, ppCP) == COM.S_OK) {
fails for some reason which i don't know. I have checked the IID for the IApplicationEvents4 and its correct. Please help. Please suggest what am I doing wrong here.

Regards.

[nmarathe]

Hello All,

I found out why the ConnectionPointContainer was failing here as i was calling it on the Word document instead of Application. Once i made those changes it started working. But now, i am not able to attach the sink object with the Connection point. I believe the following code is the culprit

private int QueryInterface(int riid, int ppvObject) {
if (riid == 0 || ppvObject == 0)

return COM.E_INVALIDARG;
GUID guid = new GUID();
COM.MoveMemory(guid, riid, GUID.sizeof);

if (COM.IsEqualGUID(guid, COM.IIDIUnknown)
|| COM.IsEqualGUID(guid, COM.IIDIDispatch)) {
COM.MoveMemory(ppvObject, new int[] { iDispatch.getAddress() }, 4);
AddRef();
return COM.S_OK;
}
COM.MoveMemory(ppvObject, new int[] { 0 }, 4);
return COM.E_NOINTERFACE;
}

Here, the method is returning COM_EN_NOINTERFACE, i don't know why ....any ideas??

thanks,

Niranjan

[nmarathe]

I have figured out the issues with the code and it is working fine. I wanted to pass a Java object to an external COM API, which expects an IDispatch pointer. I have written following code to implement the IDispatch method looking at some of the samples eclipse has provided

// EventDispatch implements a simple IDispatch interface which will be called
// when the event is fired.
public class EventDispatch {
private COMObject iDispatch;

private int refCount = 0;
private int eventID;
//private GUID riid;
final public static int DocumentChange = 0x00000003;

public EventDispatch(int eventID) {
this.eventID = eventID;
//this.riid = riid;
createCOMInterfaces();
}

public int getAddress() {
return iDispatch.getAddress();
}

private void createCOMInterfaces() {
iDispatch = new COMObject(new int[]{2, 0, 0, 1, 3, 4, 8}){
public int method0(int[] args) {return QueryInterface(args[0], args[1]);}
public int method1(int[] args) {return AddRef();}
public int method2(int[] args) {return Release();}
// method3 GetTypeInfoCount - not implemented
// method4 GetTypeInfo - not implemented
// method5 GetIDsOfNames - not implemented
public int method6(int[] args) {return Invoke(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7]);}
};
}

private void disposeCOMInterfaces() {
if (iDispatch != null)
iDispatch.dispose();
iDispatch = null;
}

private int AddRef() {
refCount++;
return refCount;
}

private void OnDocumentChange()
{
System.out.println("From On document change");
}
private int Invoke(int dispIdMember, int riid, int lcid, int dwFlags,
int pDispParams, int pVarResult, int pExcepInfo, int pArgErr) {
switch (eventID) {
case DocumentChange:
System.out.println("Calling document change");
OnDocumentChange();
break;
}
return COM.S_OK;
}

private int QueryInterface(int riid, int ppvObject) {
if (riid == 0 || ppvObject == 0)

return COM.E_INVALIDARG;
GUID guid = new GUID();
COM.MoveMemory(guid, riid, GUID.sizeof);

if (COM.IsEqualGUID(guid, COM.IIDIUnknown)
|| COM.IsEqualGUID(guid, COM.IIDIDispatch)) {
COM.MoveMemory(ppvObject, new int[] { iDispatch.getAddress() }, 4);
AddRef();
return COM.S_OK;
}
COM.MoveMemory(ppvObject, new int[] { 0 }, 4);
return COM.E_NOINTERFACE;
}

int Release() {
refCount--;
if (refCount == 0) {
disposeCOMInterfaces();
}
return refCount;
}

However, when the external COM API calls the QueryInterface() on this object, the QueryInterface() implementation returns COM.E_NOINTERFACE as the pointer being passed doesn't match the IIDIUnknown or IIDIDispatch.

It will be great if someone can point why this is happening or what am i doing wrong here ?? The external API I am using is the IConnectionPoint->Advise to register this object to recieve the DocumentChange event from Word Application.

Thanks

Niranjan