| Reading data from IStorage Object [message #464369] |
Tue, 22 November 2005 09:11  |
Eclipse User |
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Originally posted by: andrea.obergfell.hauk-sasko.de
Hi,
I'm trying to drag'n'drop emails from MS Outlook to my Java application.
After doing lots of tests I found out Outlook provides the contents as an
IStorage object (org.eclipse.swt.internal.ole.win32.IStorage). I
subclassed the ByteArrayTransfer class and modified the nativeToJava
method, but now I can't figure out how to get the actual data from the
IStorage object. EnumElements returns 1 value, but I don't know what to do
with it.
Any ideas?
Or is my approach completely wrong?
Thanks
Andrea
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| Re: Reading data from IStorage Object [message #464660 is a reply to message #464381] |
Mon, 28 November 2005 11:52  |
| Eclipse User |
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Originally posted by: andrea.obergfell.hauk-sasko.de
public Object nativeToJava(TransferData transferData) {
System.out.println("nativeToJava: type = " + transferData.type);
IDataObject idata = new IDataObject(transferData.pIDataObject);
idata.AddRef();
FORMATETC formatetc = transferData.formatetc;
// fill up the STGMEDIUM structure via IDataObject
STGMEDIUM stg = new STGMEDIUM();
stg.tymed = -1;
int hresult = idata.GetData( formatetc, stg );
idata.Release();
if ( hresult != COM.S_OK )
{
System.out.println("something is wrong here");
}
System.out.println("stg.tymed = " + stg.tymed);
System.out.println("stg.sizeof = " + stg.sizeof);
System.out.println("stg.unionField = " + stg.unionField);
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| Re: Reading data from IStorage Object [message #464661 is a reply to message #464381] |
Mon, 28 November 2005 12:01 |
| Eclipse User |
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Originally posted by: andrea.obergfell.hauk-sasko.de
public Object nativeToJava(TransferData transferData) {
IDataObject idata = new IDataObject(transferData.pIDataObject);
idata.AddRef();
FORMATETC formatetc = transferData.formatetc;
// fill up the STGMEDIUM structure via IDataObject
STGMEDIUM stg = new STGMEDIUM();
stg.tymed = -1;
int hresult = idata.GetData( formatetc, stg );
idata.Release();
if ( hresult != COM.S_OK )
{
System.out.println("something is wrong here");
}
if ((stg.tymed & 8) == 8)
{
// IStorage
IStorage storage = new IStorage(stg.unionField);
storage.AddRef();
int [] x = new int [1];
int ret = storage.EnumElements(0,0,0,x);
IEnumSTATSTG st = new IEnumSTATSTG(x[0]);
st.AddRef();
// here I don't know how to continue ...
}
}
I think I need to call st.Next(), but don't know the proper arguments.
And then I don't know what to do with with the return value from Next().
IEnumSTATSTG.Next() should be enumerating STATSTG structures, but there's
only a default constructor with no arguments in STATSTG ...
So I'm really confused.
Cheers
Andrea
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| Re: Reading data from IStorage Object [message #464673 is a reply to message #464661] |
Mon, 28 November 2005 16:18 |
 Veronika Irvine
Messages: 1272
Registered: July 2009 |
Senior Member |
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public Object nativeToJava(TransferData transferData) {
IDataObject idata = new IDataObject(transferData.pIDataObject);
idata.AddRef();
FORMATETC formatetc = transferData.formatetc;
// fill up the STGMEDIUM structure via IDataObject
STGMEDIUM stg = new STGMEDIUM();
stg.tymed = -1;
int hresult = idata.GetData( formatetc, stg );
idata.Release();
if ( hresult != COM.S_OK )
{
System.out.println("something is wrong here");
}
if ((stg.tymed & 8) == 8)
{
// IStorage
IStorage storage = new IStorage(stg.unionField);
storage.AddRef();
int [] x = new int [1];
int ret = storage.EnumElements(0,0,0,x);
IEnumSTATSTG enumSTATSTG = new IEnumSTATSTG(x[0]);
enumSTATSTG .AddRef();
STATSTG[] data = new STATSTG[0];
// Loop over enumerator
int rgelt = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT,
STATSTG.sizeof);
int[] pceltFetched = new int[1];
enumSTATSTG .Reset();
while (enumSTATSTG .Next(1, rgelt, pceltFetched) == COM.S_OK &&
pceltFetched[0] == 1) {
STATSTG statstg = new STATSTG();
COM.MoveMemory(statstg, rgelt, STATSTG.sizeof);
STATSTG[] newData = new STATSTG[data.length + 1];
System.arraycopy(data, 0, newData, 0, data.length);
newData[data.length] = statstg;
data = newData;
}
OS.GlobalFree(rgelt);
enumSTATSTG .Release();
// do something with STATSTG[]
storage.Release;
}
}
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