public virtual void Resume(DdemlConversation conversation)
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.GetType().ToString());
}
if (!IsRegistered)
{
throw new InvalidOperationException(Resources.NotRegisteredMessage);
}
if (conversation == null)
{
throw new ArgumentNullException("conversation");
}
if (!conversation.IsPaused)
{
throw new InvalidOperationException(Resources.NotPausedMessage);
}
// Enable the DDEML callback for the specified conversation only.
bool result = Ddeml.DdeEnableCallback(_InstanceId, conversation.Handle, Ddeml.EC_ENABLEALL);
// Check the result to see if the DDEML callback was enabled.
if (!result)
{
int error = Ddeml.DdeGetLastError(_InstanceId);
throw new DdemlException(Resources.ServerResumeFailedMessage, error);
}
// Decrement the conversation's waiting count. The conversation will only resume if the count is zero.
conversation.DecrementWaiting();
}
public virtual void Resume()
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.GetType().ToString());
}
if (!IsRegistered)
{
throw new InvalidOperationException(Resources.NotRegisteredMessage);
}
// Enable the DDEML callback for all conversations.
bool result = Ddeml.DdeEnableCallback(_InstanceId, IntPtr.Zero, Ddeml.EC_ENABLEALL);
// Check the result to see if the DDEML callback was enabled.
if (!result)
{
int error = Ddeml.DdeGetLastError(_InstanceId);
throw new DdemlException(Resources.ServerResumeAllFailedMessage, error);
}
// Decrement each conversation's waiting count. The conversation will only resume if the count is zero.
foreach (DdemlConversation conversation in _ConversationTable.Values)
{
conversation.DecrementWaiting();
}
}
public virtual void Register()
{
if (IsDisposed)
throw new ObjectDisposedException(GetType().ToString());
if (IsRegistered)
throw new InvalidOperationException(Resources.AlreadyRegisteredMessage);
// Make sure the context is initialized.
if (!_Context.IsInitialized)
_Context.Initialize();
// Get a local copy of the DDEML instance identifier so that it can be used in the finalizer.
_InstanceId = _Context.InstanceId;
// Make sure the conversation table is empty.
_ConversationTable.Clear();
// Register the service name.
_ServiceHandle = RegistrationManager.Register(_InstanceId, _Service);
// If the service handle is null then the service name could not be registered.
if (_ServiceHandle == IntPtr.Zero)
{
var error = Ddeml.DdeGetLastError(_InstanceId);
var message = Resources.RegisterFailedMessage;
message = message.Replace("${service}", _Service);
throw new DdemlException(message, error);
}
// Register this server with the context so that it can receive DDEML callbacks.
_Context.RegisterServer(this);
// Raise the StateChange event.
StateChange?.Invoke(this, EventArgs.Empty);
}
public virtual void Pause()
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.GetType().ToString());
}
if (!IsRegistered)
{
throw new InvalidOperationException(DDE.NotRegisteredMessage);
}
// Disable the DDEML callback for all conversations.
bool result = Ddeml.DdeEnableCallback(_InstanceId, IntPtr.Zero, Ddeml.EC_DISABLE);
// Check the result to see if the DDEML callback was disabled.
if (!result)
{
int error = Ddeml.DdeGetLastError(_InstanceId);
throw new DdemlException(DDE.ServerPauseAllFailedMessage, error);
}
// Increment each conversation's waiting count.
foreach (DdemlConversation conversation in _ConversationTable.Values)
{
conversation.IncrementWaiting();
}
}
public virtual void Pause(DdemlConversation conversation)
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.GetType().ToString());
}
if (!IsRegistered)
{
throw new InvalidOperationException(DDE.NotRegisteredMessage);
}
if (conversation == null)
{
throw new ArgumentNullException("conversation");
}
if (conversation.IsPaused)
{
throw new InvalidOperationException(DDE.AlreadyPausedMessage);
}
// Disable the DDEML callback for the specified conversation only.
bool result = Ddeml.DdeEnableCallback(_InstanceId, conversation.Handle, Ddeml.EC_DISABLE);
// Check the result to see if the DDEML callback was disabled.
if (!result)
{
int error = Ddeml.DdeGetLastError(_InstanceId);
throw new DdemlException(DDE.ServerPauseFailedMessage, error);
}
// Increment the conversation's waiting count.
conversation.IncrementWaiting();
}
internal void Initialize(int afCmd)
{
// Initialize a DDEML instance.
_InstanceId = InstanceManager.Initialize(_Callback, afCmd);
// If the instance identifier is null then the DDEML could not be initialized.
if (_InstanceId == 0)
{
int error = Ddeml.DdeGetLastError(_InstanceId);
throw new DdemlException(Resources.InitializeFailedMessage, error);
}
}
public virtual void Advise(string topic, string item)
{
if (IsDisposed)
throw new ObjectDisposedException(GetType().ToString());
if (!IsRegistered)
throw new InvalidOperationException(Resources.NotRegisteredMessage);
if (topic == null)
throw new ArgumentNullException("topic");
if (topic.Length > Ddeml.MAX_STRING_SIZE)
throw new ArgumentException(Resources.StringParameterInvalidMessage, "topic");
if (item == null)
throw new ArgumentNullException("item");
if (item.Length > Ddeml.MAX_STRING_SIZE)
throw new ArgumentException(Resources.StringParameterInvalidMessage, "item");
// Assume the topic name and item name are wild.
var topicHandle = IntPtr.Zero;
var itemHandle = IntPtr.Zero;
// Create a string handle for the topic name if it is not wild.
if (topic != "*")
topicHandle = Ddeml.DdeCreateStringHandle(_InstanceId, topic, Ddeml.CP_WINANSI);
// Create a string handle for the item name if it is not wild.
if (item != "*")
itemHandle = Ddeml.DdeCreateStringHandle(_InstanceId, item, Ddeml.CP_WINANSI);
// Post an advise notification. This will cause an XTYP_ADVREQ transaction for each conversation.
bool result = Ddeml.DdePostAdvise(_InstanceId, topicHandle, itemHandle);
// Free the string handles created earlier.
Ddeml.DdeFreeStringHandle(_InstanceId, itemHandle);
Ddeml.DdeFreeStringHandle(_InstanceId, topicHandle);
// Check the result to see if the post failed.
if (!result)
{
int error = Ddeml.DdeGetLastError(_InstanceId);
string message = Resources.AdviseFailedMessage;
message = message.Replace("${service}", _Service);
message = message.Replace("${topic}", topic);
message = message.Replace("${item}", item);
throw new DdemlException(message, error);
}
}