XTYP_MONITOR transaction

A Dynamic Data Exchange (DDE) debugger's DDE callback function, DdeCallback, receives the XTYP_MONITOR transaction whenever a DDE event occurs in the system. To receive this transaction, an application must specify the APPCLASS_MONITOR value when it calls the DdeInitialize function.

#define     XCLASS_NOTIFICATION      0x8000
#define     XTYPF_NOBLOCK            0x0002
#define     XTYP_MONITOR            (0x00F0 | XCLASS_NOTIFICATION | XTYPF_NOBLOCK)

Parameters

uType

The transaction type.

uFmt

Not used.

hconv

Not used.

hsz1

Not used.

hsz2

Not used.

hdata

A handle to a DDE object that contains information about the DDE event. The application should use the DdeAccessData function to obtain a pointer to the object.

dwData1

Not used.

dwData2

The DDE event. This parameter can be one of the following values.

Value	Meaning
MF_CALLBACKS 0x08000000	The system sent a transaction to a DDE callback function. The DDE object contains a MONCBSTRUCT structure that provides information about the transaction.
MF_CONV 0x40000000	A DDE conversation was established or terminated. The DDE object contains a MONCONVSTRUCT structure that provides information about the conversation.
MF_ERRORS 0x10000000	A DDE error occurred. The DDE object contains a MONERRSTRUCT structure that provides information about the error.
MF_HSZ_INFO 0x01000000	A DDE application created, freed, or incremented the usage count of a string handle, or a string handle was freed as a result of a call to the DdeUninitialize function. The DDE object contains a MONHSZSTRUCT structure that provides information about the string handle.
MF_LINKS 0x20000000	A DDE application started or stopped an advise loop. The DDE object contains a MONLINKSTRUCT structure that provides information about the advise loop.
MF_POSTMSGS 0x04000000	The system or an application posted a DDE message. The DDE object contains a MONMSGSTRUCT structure that provides information about the message.
MF_SENDMSGS 0x02000000	The system or an application sent a DDE message. The DDE object contains a MONMSGSTRUCT structure that provides information about the message.

Return value

If the callback function processes this transaction, it should return 0.

Requirements

See also

Reference

DdeAccessData

DdeInitialize

DdeUninitialize

MONCBSTRUCT

MONCONVSTRUCT

MONERRSTRUCT

MONHSZSTRUCT

MONLINKSTRUCT

MONMSGSTRUCT

Conceptual

Dynamic Data Exchange Management Library