/// <summary>
/// Creates a COM object and returns the transparent proxy
/// which intercepts all calls to the object
/// </summary>
/// <param name="type">Interface which defines the method and properties to intercept</param>
/// <returns>Transparent proxy to the real proxy for the object</returns>
/// <remarks>
/// The <paramref name="type"/> must be an interface decorated with
/// the <see cref="ComProgIdAttribute"/> attribute.
/// </remarks>
public static object CreateInstance(Type type)
{
if (null == type)
{
throw new ArgumentNullException("type");
}
if (!type.IsInterface)
{
throw new ArgumentException("The specified type must be an interface.", "type");
}
ComProgIdAttribute progID = ComProgIdAttribute.GetAttribute(type);
if (null == progID || null == progID.Value || 0 == progID.Value.Length)
{
throw new ArgumentException("The specified type must define a ComProgId attribute.", "type");
}
Type comType = Type.GetTypeFromProgID(progID.Value, true);
object comObject = Activator.CreateInstance(comType);
if (null == comObject)
{
throw new TypeLoadException(
string.Format("Unable to create an instance of the specified COM server \"{0}\".",
progID.Value));
}
COMWrapper wrapper = new COMWrapper(comObject, type);
return(wrapper.GetTransparentProxy());
}
/// <summary>
/// get the prog-id corresponding to the given clisid
/// </summary>
/// <param name="strProgid"></param>
/// <returns></returns>
private static string getClsidFromProgId(string strProgid)
{
ComProgIdAttribute progID = new ComProgIdAttribute(strProgid);
if (null == progID || null == progID.Value || 0 == progID.Value.Length)
throw new ArgumentException("The specified type must define a ComProgId attribute.", "type");
Type comType = Type.GetTypeFromProgID(progID.Value, true);
return comType.GUID.ToString("D");
}