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List:       ms-wmtalk
Subject:    Re: A little question
From:       Iain <idowns () DIRCON ! CO ! UK>
Date:       2004-08-28 13:49:11
Message-ID: 20040828134643.XCHY11492.mta05-svc.ntlworld.com () idcserver
[Download RAW message or body]

Here's a snippet of C.  You should be able to work out how to do it In
VB.NET from this

Iain

CComPtr<IWMMetadataEditor> pEditor;
hr = WMCreateEditor( &pEditor );
hr = pEditor->Open( A2W(FilePath)) ;
CComQIPtr<IWMHeaderInfo, &IID_IWMHeaderInfo> pInfo = pEditor;
hr = GetASFDuration(pInfo, DurationMS);


HRESULT GetASFDuration(IWMHeaderInfo *pHeaderInfo, long &DurationMS)
{
        HRESULT hr = S_OK;
        WMT_ATTR_DATATYPE Type;
        WORD DataSize = sizeof(long);
        WORD StreamNo = 0;
    hr = pHeaderInfo->GetAttributeByName( &StreamNo,
                                        g_wszWMDuration,
                                        &Type,

NULL,
                                        &DataSize);
        if( FAILED( hr ))
        {
                printf("Failed to get value for Duration (first time) with
%lx", hr);
                return hr;
        }
        if (Type != WMT_TYPE_QWORD   || DataSize != sizeof(QWORD))
        {
                printf("Duration is NOT a QWORD ...");
                return E_FAIL;
        }

        QWORD qwDuration = 0;
    hr = pHeaderInfo->GetAttributeByName( &StreamNo,
                                        g_wszWMDuration,
                                        &Type,

(BYTE *) &qwDuration,
                                        &DataSize);
        if( FAILED( hr ))
        {
                printf("Failed to get value for Duration with %lx", hr);
                return hr;
        }
        DurationMS = (long) (qwDuration / 10000);
        return S_OK;
}
-----Original Message-----
From: WMTalk [mailto:WMTalk@DISCUSS.MICROSOFT.COM] On Behalf Of Stan
Sainte-Rose
Sent: 28 August 2004 03:17
To: WMTalk@DISCUSS.MICROSOFT.COM
Subject: A little question

Hi,

How to know the duration of a wma file ?
I need to read each wma file and get its duration.
I would like to do it with vb.net
I don't have problems to read each file from a directory,
I just want to know how and/or get the duration.

Any help ?
Stan

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