Dynamic Data Exchange

=szAppNameszTopicName!szItemName

Therefore the Topic for the particular instance of TeemTalk under question is given between the and the ! characters.

The last piece of information required to establish a permanent data link is the item name itself. TeemTalk treats the item name as a direct reference to a position on the display area. Each ItemName refers to a line on the screen and is sent in a string representation of the screen coordinates (top left is 0,0) followed by the length of the string. For example: '23,5,8' refers to the area of the screen located at column 24, row 6, and continues for 8 characters.

A typical copy to the clipboard, in the case of a DDE Column Copy, would look like this:

=tt07w'TTLK1'!'18,1,8'

=tt07w'TTLK1'!'18,2,8'

=tt07w'TTLK1'!'18,3,8'

=tt07w'TTLK1'!'18,4,8'

=tt07w'TTLK1'!'18,5,8'

When a potential client application (for example Microsoft Excel) has this information pasted into its cells, a WM_DDE_INITIATE message is broadcast using the szAppName and szTopicName fields. All applications that recognize the two strings (this should be a particular instance of TeemTalk) will reply with a positive WM_DDE_ACK message, assuming of course that the current TeemTalk document name matches that of the DDE Topic Name.

Once the client receives the WM_DDE_ACK, it will send a WM_DDE_ADVISE message to TeemTalk. Depending upon the information provided by the client, within its ADVISE message's Data block, TeemTalk will then provide updates reflecting any change to the data using the WM_DDA_DATA message, sending the ItemName as an identifier to the particular area on the screen that has changed. Either a NULL data item will be sent, informing the client that the particular piece of information has changed and allowing it to transmit a WM_DDE_REQUEST message using the ItemName to get the data from TeemTalk when it wants to (i.e. a Warm link), or the data will be sent directly (Hot link).

Direct Initiation Of A DDE Link

An application that knows the area of the TeemTalk screen that contains data of interest to it can directly initiate a DDE link to TeemTalk using the appropriate szAppname and szTopicName. Data messages can then proceed as described in the previous section, using szItemName(s) to reflect the area of the screen. This method is adopted by Excel when a particular spreadsheet that contains these command strings is recalled or reopened using the File menu. As long as the AppName and DocName (TopicName) match, then TeemTalk can then start sending fresh updates to Excel, once the initial (WM_DDE_ADVISE) preamble is successfully completed.

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Xerox 07W & -11W, 05W manual Direct Initiation Of a DDE Link, 13-5, =szAppNameszTopicName!szItemName

07W & -11W, 05W specifications

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