public string Register(string service)
{
if (IsRegistered || _InstanceId != 0)
{
throw new InvalidOperationException("AlreadyRegisteredMessage");
}
if (service == null || service.Length > Ddeml.MAX_STRING_SIZE)
{
throw new ArgumentNullException("service");
}
_Service = service;
_ConversationTable.Clear();
_InstanceId = Initialize(Ddeml.APPCLASS_STANDARD);
_ServiceHandle = Ddeml.DdeCreateStringHandle(_InstanceId, _Service, Ddeml.CP_WINANSI);
// Register the service name.
if (Ddeml.DdeNameService(_InstanceId, _ServiceHandle, IntPtr.Zero, Ddeml.DNS_REGISTER) == IntPtr.Zero)
{
Ddeml.DdeFreeStringHandle(_InstanceId, _ServiceHandle);
_ServiceHandle = IntPtr.Zero;
}
// If the service handle is null then the service name could not be registered.
if (_ServiceHandle == IntPtr.Zero)
{
int error = Ddeml.DdeGetLastError(_InstanceId);
return(Ddeml.DDEGetErrorMsg(error));
}
return(null);
}
public void Unregister()
{
Ddeml.DdeNameService(_InstanceId, _ServiceHandle, IntPtr.Zero, Ddeml.DNS_UNREGISTER);
// Free the service string handle.
Ddeml.DdeFreeStringHandle(_InstanceId, _ServiceHandle);
// Indicate that the service name is no longer registered.
_ServiceHandle = IntPtr.Zero;
_InstanceId = 0;
}
