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 Advise(string topic, string item)
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.GetType().ToString());
}
if (!IsRegistered)
{
throw new InvalidOperationException("NotRegisteredMessage");
}
if (topic == null || topic.Length > Ddeml.MAX_STRING_SIZE)
{
throw new ArgumentNullException("topic");
}
if (item == null || item.Length > Ddeml.MAX_STRING_SIZE)
{
throw new ArgumentNullException("item");
}
// Assume the topic name and item name are wild.
IntPtr topicHandle = topic != "*" ? Ddeml.DdeCreateStringHandle(_InstanceId, topic, Ddeml.CP_WINANSI) : IntPtr.Zero;
IntPtr itemHandle = item != "*" ? Ddeml.DdeCreateStringHandle(_InstanceId, item, Ddeml.CP_WINANSI) : IntPtr.Zero;
// Check the result to see if the post failed.
if (!Ddeml.DdePostAdvise(_InstanceId, topicHandle, itemHandle))
{
int error = Ddeml.DdeGetLastError(_InstanceId);
var msg = Ddeml.DDEGetErrorMsg(error); if (msg != null)
{
}
}
Ddeml.DdeFreeStringHandle(_InstanceId, itemHandle);
Ddeml.DdeFreeStringHandle(_InstanceId, topicHandle);
}
public void Resume(IntPtr hConv)
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.GetType().ToString());
}
if (!IsRegistered)
{
throw new InvalidOperationException("NotRegisteredMessage");
}
// Check the result to see if the DDEML callback was enabled.
if (!Ddeml.DdeEnableCallback(_InstanceId, hConv, Ddeml.EC_ENABLEALL))
{
int error = Ddeml.DdeGetLastError(_InstanceId);
Ddeml.DDEGetErrorMsg(error);
}
}
