public int GetData(ref FormatEtc pFormatEtc, ref StgMedium pMedium)
{
ushort cf = (ushort)pFormatEtc.Format;
if (cf == s_cfMultiSelect)
{
BinaryWriter writer = CreateBinaryWriter();
// MMC expects a SMMCObjectTypes struct. Don't bother creating the struct and serializing it,
// just write the fields:
// 1) count of GUIDs.
// 2) array of node GUIDs.
writer.Write(1);
writer.Write(m_node.Guid.ToByteArray());
// Allocate HGlobal memory.
pMedium.Global = Marshal.AllocHGlobal(new IntPtr(writer.BaseStream.Length));
Debug.Assert(pMedium.Global != IntPtr.Zero, "pMedium.Global != IntPtr.Zero");
// Write the memory stream to the HGlobal memory.
try
{
WriteMemoryStreamToHGlobal(writer, pMedium.Global);
}
catch
{
// An error occurred, so free the memory we allocated.
Marshal.FreeHGlobal(pMedium.Global);
throw;
}
return(Constants.Win32.HResults.S_OK);
}
else
{
return(Constants.Win32.HResults.E_NOTIMPL);
}
}
/// <summary>
/// Send data to MMC in a stream depending on what is requested
/// </summary>
public void GetDataHere(ref FormatEtc pFormatEtc, ref StgMedium pMedium)
{
const char unknownString = '\0'; // Send this value if we don't know what string to send.
try
{
ushort cf = (ushort)pFormatEtc.Format;
BinaryWriter writer = CreateBinaryWriter();
if (cf == s_displayName)
{
writer.Write(m_node.DisplayName.ToCharArray());
}
else if (cf == s_SZNodeType)
{
writer.Write(unknownString);
}
else if (cf == s_nodeType)
{
writer.Write(m_node.Guid.ToByteArray());
}
else if (cf == s_snapinClsid)
{
writer.Write(m_node.Snapin.Guid.ToByteArray());
}
// Write the memory stream to the HGlobal memory.
WriteMemoryStreamToHGlobal(writer, pMedium.Global);
}
catch (System.Exception e)
{
new ExceptionDialog(e, "The following exception has occurred in the snap-in:").ShowDialog(m_node.Snapin);
}
}