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
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 2000 Professional [desktop apps only] |
| Minimum supported server |
Windows 2000 Server [desktop apps only] |
| Header |
|