Hp NonStop G-Series Manual do Utilizador descarregar pdf (Página 113)

User Hook Library

Extending the Tandem DDE Gateway

110838 Tandem Computers Incorporated 8–11

in the pbSupportedFormat parameter and zero in the pbConvertWithOnlyHookCode

parameter.

The TdmgwHookDdeRequestPostConvert function is called after the automatic data

conversion is used. You can modify the converted data before it is returned to your

client application. The data is pointed to by the parameter

lpRequestDataElementValue and is in the clipboard format cfFormat.

You can override the default length of the data area pointed to by the parameter

lpRequestDataElementValue by using the TdmgwHookGetRequestDdeSize User

Hook Library function.

Prototype

BOOL FAR PASCAL TdmgwHookDdeRequestPostConvert

(HWND hMainWnd, in

unsigned long ulInitializeServiceSerialNumber, in

LPSTR lpServiceName, in

struct tagDdeDictElementData far * pstructElementData, in

WORD cfFormat, in

void far * lpRequestDataElementValue, in/out

struct tagTdmgwErrorMsg far * pstructErrMsg); out

Parameters

Return Value Zero = Error.

Non-zero = No error.

hMainWnd Window handle of Tandem DDE Gateway main

window.

ulInitializeServiceSerialNumber Number incremented with each

INITIALIZESERVICE command. Starts at zero

when the Tandem DDE Gateway is started.

Rolls over to zero after 4,294,967,295.

lpServiceName Current ServiceName object (from

INITIALIZESERVICE command).

pstructElementData Description of current data element. (See the

“Tandem DDE Gateway Dictionary Structure”

topic).

cfFormat Clipboard format of

lpRequestDataElementValue.

lpRequestDataElementValue Data value returned from the built-in automatic

data conversion (will be returned to the client

application that issued the DDE Request

function). Data is in the clipboard format

cfFormat.

pstructErrMsg See “Returning Error Messages” earlier in this

section.

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