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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| ddeml.h
| Unicode
| No
| Platform Notes
| None
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DdeConnectList
The DdeConnectList function establishes a conversation with all server applications that support
the specified service name and topic name pair. An application can also use
this function to obtain a list of conversation handles by passing the function an
existing conversation handle. The Dynamic Data Exchange Management Library removes the handles of any terminated conversations from the conversation
list. The resulting conversation list contains the handles of all currently
established conversations that support the specified service name and topic name.
HCONVLIST DdeConnectList(
DWORD idInst,
| // instance identifier
| HSZ hszService,
| // handle to service name string
| HSZ hszTopic,
| // handle to topic name string
| HCONVLIST hConvList,
| // handle to conversation list
| PCONVCONTEXT pCC
| // pointer to structure with context data
| );
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Parameters
idInst
Specifies the application instance identifier obtained by a previous call to
the DdeInitialize function.
hszService
Identifies the string that specifies the service name of the server
application with which a conversation is to be established. If this parameter is 0L, the
system attempts to establish conversations with all available servers that
support the specified topic name.
hszTopic
Identifies the string that specifies the name of the topic on which a
conversation is to be established. This handle must have been created by a previous
call to the DdeCreateStringHandle function. If this parameter is 0L, the system will attempt to establish
conversations on all topics supported by the selected server (or servers).
hConvList
Identifies the conversation list to be enumerated. This parameter should be 0L
if a new conversation list is to be established.
pCC
Points to the CONVCONTEXT structure that contains conversation-context information. If this parameter
is NULL, the server receives the default CONVCONTEXT structure during the XTYP_CONNECT or XTYP_WILDCONNECT transaction.
Return Values
If the function succeeds, the return value is the handle to a new conversation
list.
If the function fails, the return value is 0L. The handle to the old
conversation list is no longer valid.
Errors
The DdeGetLastError function can be used to get the error code, which may be one of the following
values:
DMLERR_DLL_NOT_INITIALIZED
DMLERR_INVALID_PARAMETER
DMLERR_NO_CONV_ESTABLISHED
DMLERR_NO_ERROR
DMLERR_SYS_ERROR
Remarks
An application must free the conversation list handle returned by the DdeConnectList function, regardless of whether any conversation handles within the list are
active. To free the handle, an application can call DdeDisconnectList.
All members of the default CONVCONTEXT structure are set to zero except cb, specifying the size of the structure, and iCodePage, specifying CP_WINANSI (the default code page) or CP_WINUNICODE, depending on
whether the ANSI or Unicode version of the DdeInitialize function was called by the client application.
See Also
CONVCONTEXT, DdeConnect, DdeCreateStringHandle, DdeDisconnect, DdeDisconnectList, DdeInitialize, DdeQueryNextServer
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