音楽ファイルの属性の長さを取得：IWMHeaderInfo::GetAttributeByName

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#include <stdio.h>  //printf　とかで必要 #include <wmsdk.h>  //HRESULT　とかで必要   using namespace System;//Console::ReadLine()で必要   #pragma comment(lib, "wmvcore.lib")   //IWMMetadataEditor　とかで必要   void main(){    HRESULT hr          = S_OK;    IWMMetadataEditor * pEditor = NULL;  IWMHeaderInfo3 * pHeaderInfo = NULL;    WORD stream = 0;  WMT_ATTR_DATATYPE enumType;  QWORD duration;  WORD cbLength = sizeof( duration );    hr = WMCreateEditor(&pEditor);  hr = pEditor->Open(L"G:\\sampleMovie\\Amanda.wma");  hr = pEditor->QueryInterface(IID_IWMHeaderInfo, (void**) &pHeaderInfo);    hr = pHeaderInfo->GetAttributeByName( &stream,   g_wszWMDuration, &enumType,(BYTE *)&duration, &cbLength );    printf("%d ミリ秒\r\n", (long) (duration / 10000) );    Console::ReadLine();//入力待-ウインドウ維持   }

4分6秒は246秒