Application, Topic, and Item Names - Win32 Programmer's Reference

Custom Search

Application, Topic, and Item Names

The DDE protocol identifies the units of data passed between the client and server with a three-level hierarchy of application, topic, and item names.

Each DDE conversation is uniquely defined by the application name and topic. At the beginning of a DDE conversation, the client and server determine the application name and topic. The application name is usually the name of the server application. For example, when Microsoft Excel acts as the server in a conversation, the application name is Excel.

The DDE topic is a general classification of data within which multiple data items may be "discussed" (exchanged) during the conversation. For applications that operate on file-based documents, the topic is usually a filename. For other applications, the topic is an application-specific name.

Because the client and server window handles together identify a DDE conversation, the application name and topic that define a conversation cannot be changed during the course of the conversation.

A DDE data item is information related to the conversation topic exchanged between the applications. Values for the data item can be passed from the server to the client, or from the client to the server. Data can be passed with any of the standard clipboard formats or with a registered clipboard format. A special, registered format named Link identifies an item in a DDE conversation. For more information about clipboard formats, see Clipboard.

Last news from Greatis Software

    Nostalgia .Net     .Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More »

Recommended software for developers

    Ultimate Pack     Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More »

    Form Designer .Net     Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More »

    Print Suite .Net     Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More »

    Gradient Controls .Net     Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More »

    Greatis iGrid     iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More »

All the contacts and projects

Dmitry Vasiliev (just.dmitry)

More Online Helps

Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages

greatis just4fun network