# wxDDEClient Class Reference
[Interprocess Communication]

`#include <wx/dde.h>`

Inheritance diagram for wxDDEClient:
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## Detailed Description

A wxDDEClient object represents the client part of a client-server DDE (Dynamic Data Exchange) conversation.

To create a client which can communicate with a suitable server, you need to derive a class from wxDDEConnection and another from wxDDEClient. The custom wxDDEConnection class will intercept communications in a "conversation" with a server, and the custom wxDDEServer is required so that a user-overridden OnMakeConnection() member can return a wxDDEConnection of the required class, when a connection is made.

This DDE-based implementation is available on Windows only, but a platform-independent, socket-based version of this API is available using wxTCPClient.

##

Library: wxBase

Category: Interprocess Communication
Availability: only available for the wxMSW port.

See also:
  wxDDEServer, wxDDEConnection, Interprocess Communication

## Public Member Functions
| wxDDEClient ()
| Constructs a client object.
wxConnectionBase * | MakeConnection (const wxString &host, const wxString &service, const wxString &topic)
| Tries to make a connection with a server specified by the host (machine name under UNIX, ignored under Windows), service name (must contain an integer port number under UNIX), and topic string.
wxConnectionBase * | OnMakeConnection ()
| The type of wxDDEConnection returned from a MakeConnection() call can be altered by deriving the OnMakeConnection() member to return your own derived connection object.
bool | ValidHost (const wxString &host)
| Returns true if this is a valid host name, false otherwise.

List of all members.

## Constructor & Destructor Documentation

wxDDEClient::wxDDEClient | ( |  | ) |

Constructs a client object.

## Member Function Documentation

wxConnectionBase* wxDDEClient::MakeConnection | ( | const wxString & | host,
|  | const wxString & | service,
|  | const wxString & | topic |
| ) |  |  |

Tries to make a connection with a server specified by the host (machine name under UNIX, ignored under Windows), service name (must contain an integer port number under UNIX), and topic string.

If the server allows a connection, a wxDDEConnection object will be returned.

The type of wxDDEConnection returned can be altered by overriding the OnMakeConnection() member to return your own derived connection object.

wxConnectionBase* wxDDEClient::OnMakeConnection | ( |  | ) |

The type of wxDDEConnection returned from a MakeConnection() call can be altered by deriving the OnMakeConnection() member to return your own derived connection object.

By default, a wxDDEConnection object is returned.

The advantage of deriving your own connection class is that it will enable you to intercept messages initiated by the server, such as wxDDEConnection::OnAdvise(). You may also want to store application-specific data in instances of the new class.

bool wxDDEClient::ValidHost | ( | const wxString & | host | ) |

Returns true if this is a valid host name, false otherwise.

This always returns true under MS Windows.

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