Platform SDK: Interprocess Communications

CONVINFO

The CONVINFO structure contains information about a DDE conversation.

typedef struct tagCONVINFO { 
  DWORD       cb; 
  DWORD_PTR   hUser; 
  HCONV       hConvPartner; 
  HSZ         hszSvcPartner; 
  HSZ         hszServiceReq; 
  HSZ         hszTopic; 
  HSZ         hszItem; 
  UINT        wFmt; 
  UINT        wType; 
  UINT        wStatus; 
  UINT        wConvst; 
  UINT        wLastError; 
  HCONVLIST   hConvList; 
  CONVCONTEXT ConvCtxt; 
  HWND        hwnd; 
  HWND        hwndPartner; 
} CONVINFO, *PCONVINFO;

Members

cb

Specifies the structure's size, in bytes.

hUser

Application-defined data.

hConvPartner

Handle to the partner application in the DDE conversation. This member is zero if the partner has not registered itself (using the DdeInitialize function) to make DDE Management Library (DDEML) function calls. An application should not pass this member to any DDEML function except DdeQueryConvInfo.

hszSvcPartner

Handle to the service name of the partner application.

hszServiceReq

Handle to the service name of the server application that was requested for connection.

hszTopic

Handle to the name of the requested topic.

hszItem

Handle to the name of the requested item. This member is transaction specific.

wFmt

Specifies the format of the data being exchanged. This member is transaction specific.

wType

Specifies the type of the current transaction. This member is transaction specific; it can be one of the following values.

Value	Meaning
XTYP_ADVDATA	Informs a client that advise data from a server has arrived.
XTYP_ADVREQ	Requests a server to send updated data to the client during an advise loop. This transaction results when the server calls DdePostAdvise.
XTYP_ADVSTART	Requests a server to begin an advise loop with a client.
XTYP_ADVSTOP	Notifies a server that an advise loop is stopping.
XTYP_CONNECT	Requests a server to establish a conversation with a client.
XTYP_CONNECT_CONFIRM	Notifies a server that a conversation with a client has been established.
XTYP_DISCONNECT	Notifies a server that a conversation has terminated.
XTYP_EXECUTE	Requests a server to execute a command sent by a client.
XTYP_MONITOR	Notifies an application registered as APPCMD_MONITOR that DDE data is being transmitted.
XTYP_POKE	Requests a server to accept unsolicited data from a client.
XTYP_REGISTER	Notifies other DDEML applications that a server has registered a service name.
XTYP_REQUEST	Requests a server to send data to a client.
XTYP_UNREGISTER	Notifies other DDEML applications that a server has unregistered a service name.
XTYP_WILDCONNECT	Requests a server to establish multiple conversations with the same client.
XTYP_XACT_COMPLETE	Notifies a client that an asynchronous data transaction has been completed.

wStatus

Specifies the status of the current conversation. This member can be one or more of the following values.

Value	Meaning
ST_ADVISE	One or more links are in progress.
ST_BLOCKED	The conversation is blocked.
ST_BLOCKNEXT	The conversation will block after calling the next callback.
ST_CLIENT	The conversation handle passed to the DdeQueryConvInfo function is a client-side handle. If the handle is zero, the conversation handle passed to the DdeQueryConvInfo function is a server-side handle.
ST_CONNECTED	The conversation is connected.
ST_INLIST	The conversation is a member of a conversation list.
ST_ISLOCAL	Both sides of the conversation are using the DDEML.
ST_ISSELF	Both sides of the conversation are using the same instance of the DDEML.
ST_TERMINATED	The conversation has been terminated by the partner.

wConvst

Specifies the conversation state. This member can be one of the following values.

Value	Meaning
XST_ADVACKRCVD	The advise transaction has just been completed.
XST_ADVDATAACKRCVD	The advise data transaction has just been completed.
XST_ADVDATASENT	Advise data has been sent and is awaiting an acknowledgement.
XST_ADVSENT	An advise transaction is awaiting an acknowledgement.
XST_CONNECTED	The conversation has no active transactions.
XST_DATARCVD	The requested data has just been received.
XST_EXECACKRCVD	An execute transaction has just been completed.
XST_EXECSENT	An execute transaction is awaiting an acknowledgement.
XST_INCOMPLETE	The last transaction failed.
XST_INIT1	Mid-initiate state 1.
XST_INIT2	Mid-initiate state 2.
XST_NULL	Pre-initiate state.
XST_POKEACKRCVD	A poke transaction has just been completed.
XST_POKESENT	A poke transaction is awaiting an acknowledgement.
XST_REQSENT	A request transaction is awaiting an acknowledgement.
XST_UNADVACKRCVD	An unadvise transaction has just been completed.
XST_UNADVSENT	An unadvise transaction is awaiting an acknowledgement.

wLastError

Specifies the error value associated with the last transaction.

hConvList

Handle to the conversation list if the handle to the current conversation is in a conversation list. This member is NULL if the conversation is not in a conversation list.

ConvCtxt

Specifies the conversation context.

hwnd

Handle to the window of the calling application involved in the conversation.

hwndPartner

Handle to the window of the partner application involved in the current conversation.

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.

CONVINFO

Members

Requirements

See Also