public HRESULT GetString(Guid guidKey, string pwszValue, uint cchBufSize, IntPtr pcchLength)
{
var hr = _type.GetString(guidKey, pwszValue, cchBufSize, pcchLength);
Trace("guid: " + guidKey.ToName() + " value: " + pwszValue + " size: " + cchBufSize + " hr: " + hr);
return(hr);
}
public static string GetString(this IMFMediaType input, Guid key, string defaultValue = null)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (input.GetStringLength(key, out var length).IsError)
{
return(defaultValue);
}
var s = new string('\0', (int)length);
input.GetString(key, s, length, IntPtr.Zero).ThrowOnError();
return(s);
}
public static string GetString(this IMFMediaType obj, Guid key, string defaultValue = null)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
if (obj.GetStringLength(key, out var length).IsError)
{
return(defaultValue);
}
var s = new string('\0', (int)length);
length++;
obj.GetString(key, s, length, ref length).ThrowOnError();
return(s);
}