private void TestAttr()
{
short i1, i2;
short wStream = 0;
m_head.GetAttributeCount(wStream, out i1);
m_head.SetAttribute(wStream, "asdf", AttrDataType.DWORD, BitConverter.GetBytes(1234), 4);
m_head.SetAttribute(wStream, "fdsa", AttrDataType.DWORD, BitConverter.GetBytes(4321), 4);
m_head.GetAttributeCount(wStream, out i2);
Debug.Assert(i2 - i1 == 2);
short pLen = 0;
AttrDataType pType;
m_head.GetAttributeByName(ref wStream, "asdf", out pType, null, ref pLen);
byte [] b = new byte[pLen];
m_head.GetAttributeByName(ref wStream, "asdf", out pType, b, ref pLen);
Debug.Assert(BitConverter.ToInt32(b, 0) == 1234);
short sNameLen = 0;
m_head.GetAttributeByIndex((short)(i1 + 1), ref wStream, null, ref sNameLen, out pType, null, ref pLen);
StringBuilder sb = new StringBuilder(sNameLen);
byte [] b2 = new byte[pLen];
m_head.GetAttributeByIndex((short)(i1 + 1), ref wStream, sb, ref sNameLen, out pType, b2, ref pLen);
Debug.Assert(sb.ToString() == "fdsa" && pType == AttrDataType.DWORD && BitConverter.ToInt32(b2, 0) == 4321);
}
/// <summary>
/// Number of markers in the header info object for the specified stream. Wraps IWMHeaderInfo.GetAttributeCount
/// </summary>
/// <param name="StreamNumber">Stream number. Zero means file level attributes</param>
/// <returns>Number of attributes</returns>
public int AttributeCount(int StreamNumber)
{
ushort res;
m_HeaderInfo.GetAttributeCount((ushort)StreamNumber, out res);
return(res);
}
//------------------------------------------------------------------------------
// Name: CWMVCopy::CopyAttribute()
// Desc: Copies all the header attributes from the reader file to the writer.
//------------------------------------------------------------------------------
protected void CopyAttribute()
{
short wStreamNumber;
short wAttributeCount;
AttrDataType enumType;
short cbNameLength = 0;
short cbValueLength = 0;
StringBuilder pwszName = null;
byte[] pbValue = null;
for (int i = 0; i <= m_dwStreamCount; i++)
{
if (i == m_dwStreamCount)
{
//
// When the stream number is 0, the attribute is a file-level attribute
//
wStreamNumber = 0;
}
else
{
wStreamNumber = m_pwStreamNumber[i];
}
//
// Get the attribute count
//
m_pReaderHeaderInfo.GetAttributeCount(wStreamNumber,
out wAttributeCount);
//
// Copy all attributes of this stream
//
for (short j = 0; j < wAttributeCount; j++)
{
//
// Get the attribute name and value length
//
m_pReaderHeaderInfo.GetAttributeByIndex(j,
ref wStreamNumber,
null,
ref cbNameLength,
out enumType,
null,
ref cbValueLength);
pwszName = new StringBuilder(cbNameLength);
pbValue = new byte[cbValueLength];
//
// Get the attribute name and value
//
m_pReaderHeaderInfo.GetAttributeByIndex(j,
ref wStreamNumber,
pwszName,
ref cbNameLength,
out enumType,
pbValue,
ref cbValueLength);
//
// Set the attribute for the writer
//
try
{
m_pWriterHeaderInfo.SetAttribute(wStreamNumber,
pwszName.ToString(),
enumType,
pbValue,
cbValueLength);
}
catch (Exception e)
{
int hr = Marshal.GetHRForException(e);
if (E_InvalidArgument == hr)
{
//
// Some attributes are read-only; we cannot set them.
// They'll be set automatically by the writer.
//
}
else
{
throw;
}
}
}
}
}
