public object GetValue(PROPERTYKEY key)
{
var pv = IntPtr.Zero;
object value = null;
try {
pv = Marshal.AllocCoTaskMem(16);
m_IPropertyStore.GetValue(key, pv);
try {
value = PropVariant.ToObject(pv);
}
catch (Exception err) {
throw new ApplicationException("Unsupported property data type", err);
}
}
finally {
if (pv != (IntPtr)0)
{
try {
NativeMethods.PropVariantClear(pv);
}
catch {
Debug.Fail("VariantClear failure");
}
Marshal.FreeCoTaskMem(pv);
pv = IntPtr.Zero;
}
}
return(value);
}
public PropertyDescription GetPropertyDescription(PROPERTYKEY propKey)
{
var IID_IPropertyDescription = typeof(NativeMethods.IPropertyDescription).GUID;
NativeMethods.IPropertyDescription iPropertyDescription;
m_IPropertySystem.GetPropertyDescription(propKey, ref IID_IPropertyDescription, out iPropertyDescription);
return(new PropertyDescription(iPropertyDescription));
}
public void SetValue(PROPERTYKEY key, object value)
{
var pv = IntPtr.Zero;
try {
pv = NativeMethods.PropVariantFromObject(value);
m_IPropertyStore.SetValue(key, pv);
}
finally {
if (pv != IntPtr.Zero)
{
NativeMethods.PropVariantClear(pv);
Marshal.FreeCoTaskMem(pv);
pv = IntPtr.Zero;
}
}
}