|
|
hello!
im writing an addon for vista media center and id like to do a query for
year (the one from the id3 tag..).
im querying the library like this (C#):
using WMPLib;
player = new WindowsMediaPlayer();
library = (IWMPMediaCollection2)player.mediaCollection;
IWMPQuery query = library.createQuery();
String attr, op;
query.addCondition(attr, op, "2007");
IWMPStringCollection wmpstr =
library.getStringCollectionByQuery("WM/AlbumTitle", query, "audio", "",
false);
here, i always get a COMException.
"WM/Year" as attr doesnt work (as said in
http://msdn2.microsoft.com/en-us/library/aa393560.aspx) with neither "Equals"
nor "GreatherThan" as op.
ive tried "ReleaseDateYear", "ReleaseDate" and some others with varying
operators, without success.
so, am i missing something here? maybe i should create an
AxWindowsMediaPlayer to get the collection from?
thanks for any help..
stephan hattinger
|
|
From: "stephan hattinger"
[Quoted Text] > here, i always get a COMException.
What COMException? You should have got an HRESULT.
> "WM/Year" as attr doesnt work (as said in
> http://msdn2.microsoft.com/en-us/library/aa393560.aspx)
> with neither "Equals" nor "GreatherThan" as op.
If the following is your actual code:
> String attr, op;
> query.addCondition(attr, op, "2007");
then you never set the values of attr and op before creating
the query.
--
// Alessandro Angeli
// MVP :: DirectShow / MediaFoundation
// mvpnews at riseoftheants dot com
// http://www.riseoftheants.com/mmx/faq.htm
|
|
thank you for the quick response.
the basic querying really works, no excpetions and correct results if i
query for "WM/AlbumArtist", "WM/Genre", "WM/AlbumTitle" and others. but
querying for any date/year information, i get the exceptions. the only thing
that differs here from the working part is the actual query added with
IWMPQuery.addCondition.
i put the the two strings there just so i could reference them in the
following post, was a bit more confusing than it helped i guess :)
i tried to reproduce some of the exceptions, heres the results:
query.addCondition("WM/Year", "Equals", "2006"); -> ArgumentException
query.addCondition("WM/Year", "GreaterThan", "2006"); -> ArgumentException
query.addCondition("ReleaseDateYear", "Equals", "2006"); -> E_FAIL
query.addCondition("ReleaseDateYear", "GreaterThan", "2006"); -> 0xC00D32D0
(i guess the operator is wrong here)
query.addCondition("ReleaseDateYear", "EndsWith", "2006");->ArgumentException
query.addCondition("ReleaseDate", "GreaterThan", "2006/01/01");-> 0xC00D32D0
query.addCondition("ReleaseDate", "EndsWith", "2006");->ArgumentException
query.addCondition("ReleaseDate", "GreaterThan", "01.01.2006"); -> 0xC00D32D0
also, i noticed that the only date/year related thing i can use in automatic
playlists in wmp 11 is "Release Year" with quite strange, but working,
options ("is after 2000/1990/1980/etc." or "is after yeaterday/last 7
days/last 30 days/6 months/1 jear/ etc.", but no "equals" with inputtable
year)
i get the impression that microsoft somehow forgot to add this functionality
to the queries. in the docs for "WM/Year"
(http://msdn2.microsoft.com/en-us/library/aa393560.aspx) it is stated that
"WM/Year" shouldnt be queried against because it is a derived attribute, but
they give no hint whatsoever as to what should be used instead...
on the other hand i read somewhere on msdn that attributes available in the
mediacollection property of WindowsMediaPlayer will always be a subset of
those in AxWindowsMediaPlayer. maybe this propagates to the set of queryable
properties?
i have tried this too, some days ago, with no success, but i have given this
no all to thorough investigation.
"Alessandro Angeli" wrote:
[Quoted Text] > From: "stephan hattinger" > > > here, i always get a COMException. > > What COMException? You should have got an HRESULT. > > > "WM/Year" as attr doesnt work (as said in > > http://msdn2.microsoft.com/en-us/library/aa393560.aspx)> > with neither "Equals" nor "GreatherThan" as op. > > If the following is your actual code: > > > String attr, op; > > query.addCondition(attr, op, "2007"); > > then you never set the values of attr and op before creating > the query. > > -- > // Alessandro Angeli > // MVP :: DirectShow / MediaFoundation > // mvpnews at riseoftheants dot com > // http://www.riseoftheants.com/mmx/faq.htm > > > |
|
just wanted to give an update on the subject..
i still havent found a way to directly do it by queries, now i instead
just get the media sorted (getplaylistbyquery()) by
"ReleaseDateYear" (this works..) and then do some sort of "ranged"
binary search ("ranged" because what i want to find is an interval not
a single item).
hope this helps someone sometimes :)
regards,
stephan hattinger
|
|
|