XTYP_MONITOR

A 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.

HDDEDATA CALLBACK DdeCallback(
  UINT uType,     // XTYP_MONITOR
  UINT uFmt,      // clipboard data format
  HCONV hconv,    // handle to the conversation
  HSZ hsz1,       // handle to a string
  HSZ hsz2,       // handle to a string
  HDDEDATA hdata, // handle to a global memory object
  DWORD dwData1,  // transaction-specific data
  DWORD dwData2   // transaction-specific data
);

Parameters

uType

Specifies the transaction type.

uFmt

Not used.

hconv

Not used.

hsz1

Not used.

hsz2

Not used.

hdata

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

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

Value	Meaning
MF_CALLBACKS	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	A DDE conversation was established or terminated. The DDE object contains a MONCONVSTRUCT structure that provides information about the conversation.
MF_ERRORS	A DDE error occurred. The DDE object contains a MONERRSTRUCT structure that provides information about the error.
MF_HSZ_INFO	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	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	The system or an application posted a DDE message. The DDE object contains a MONMSGSTRUCT structure that provides information about the message.
MF_SENDMSGS	The system or an application sent a DDE message. The DDE object contains a MONMSGSTRUCT structure that provides information about the message.

Return Values

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

Requirements

  Windows NT/2000: Requires Windows NT 3.1 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Ddeml.h; include Windows.h.

See Also

Dynamic Data Exchange Management Library Overview, Dynamic Data Exchange Management Transactions, DdeAccessData, DdeInitialize, DdeUninitialize, MONCBSTRUCT, MONCONVSTRUCT, MONERRSTRUCT, MONHSZSTRUCT, MONLINKSTRUCT, MONMSGSTRUCT