Hp NonStop G-Series Manual do Utilizador descarregar pdf (Página 119)

Tandem DDE Gateway Dictionary Structure

Extending the Tandem DDE Gateway

110838 Tandem Computers Incorporated 8–17

To enable this User Hook Library function, return the

TDMGW_HOOK_ENABLE_UMS_POST_REC constant from the

TdmgwHookEnableUserHooks function.

Prototype

BOOL FAR PASCAL TdmgwHookUmsPostReceiveMessage

(HWND hMainWnd, in

LPSTR lpPortName, in

char far * lpUmsMessageStartAddress, in/out

unsigned int far * puUmsMessageLength, in/out

BOOL far * pbIgnoreUmsMessage, out

struct tagTdmgwErrorMsg far * pstructErrMsg) out

Parameters

Return Value Zero - Error.

Non-zero - No error.

(If zero is returned, the UMS message data will not

be sent to client applications.)

hMainWnd Window handle of the Tandem DDE Gateway main

window.

lpUmsMessageStartAddress Pointer to the UMS message, including MESSAGE-

VERSION, DDE-ITEM-NAME, and UMS-USER-

DATA. The message is stored in a buffer 31000

bytes long so you can add data.

puUmsMessageLength Input - length of UMS message.

(UMS-USER-HEADER and UMS-USER-DATA.)

Output - revised length of UMS message.

pbIgnoreUmsMessage Zero - send data to clients.

Non-Zero - Do not send data to clients.

pstructErrMsg See “Returning Error Messages,” earlier in this

section.

Tandem DDE Gateway

Dictionary Structure

You create the Tandem DDE Gateway Dictionary by using the Bridge program on the

Tandem system. You sort the resulting file and download it to your workstation. This

file contains the definitions of your applications message structures in a simple format.

You can write workstation-based application development tools to read this file, for

example, to generate code for your client applications.

The Tandem DDE Gateway Dictionary is a stream of bytes divided into fixed length

records of two types, one header record and many element data records describing the

individual data element in message layouts. The dictionary is sorted in ascending

order by element name (szElement). There are no control characters or indexes.

(Searches by key on the dictionary by the Tandem DDE Gateway and Browser use a

binary-search algorithm.)

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