XTYP_REGISTER transaction

A Dynamic Data Exchange (DDE) callback function, DdeCallback, receives the XTYP_REGISTER transaction type whenever a Dynamic Data Exchange Management Library (DDEML) server application uses the DdeNameService function to register a service name, or whenever a non-DDEML application that supports the System topic is started.

#define XCLASS_NOTIFICATION 0x8000
#define XTYPF_NOBLOCK 0x0002
#define XTYP_REGISTER (0x00A0 | XCLASS_NOTIFICATION | XTYPF_NOBLOCK)

Parameters

uType

The transaction type.

uFmt

Not used.

hconv

Not used.

hsz1

A handle to the base service name being registered.

hsz2

A handle to the instance-specific service name being registered.

hdata

Not used.

dwData1

Not used.

dwData2

Not used.

Remarks

This transaction is filtered if the application specified the CBF_SKIP_REGISTRATIONS flag in the DdeInitialize function.

A application cannot block this transaction type; the CBR_BLOCK return code is ignored.

An application should use the hsz1 parameter to add the service name to the list of servers available to the user. An application should use the hsz2 parameter to identify which application instance has started.

Requirements

See also

Reference

DdeInitialize

DdeNameService

Conceptual

Dynamic Data Exchange Management Library