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.

See Also

Dynamic Data Exchange Management Library Overview, Dynamic Data Exchange Management Structures, CONVCONTEXT, DdeInitialize, DdePostAdvise, DdeQueryConvInfo