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DdeNameService The DdeNameService function registers or unregisters the service names a dynamic data exchange (DDE) server supports. This function causes the system to send XTYP_REGISTER or XTYP_UNREGISTER transactions to other running Dynamic Data Exchange Management Library (DDEML) client applications.
VB4-32,5,6
Declare Function DdeNameService Lib "user32" Alias "DdeNameService" (ByVal idInst As Long, ByVal hsz1 As Long, ByVal hsz2 As Long, ByVal afCmd As Long) As Long |
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Operating Systems Supported |
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Requires Windows NT 3.1 or later; Requires Windows 95 or later |
- idInst
Specifies the application instance identifier obtained by a previous call to the DdeInitialize function.
- hsz1
Identifies the string that specifies the service name the server is registering or unregistering. An application that is unregistering all of its service names should set this parameter to 0L.
- hsz2
Reserved; should be set to 0L.
- afCmd
Specifies the service name flags. This parameter can be one of the following flags:
DNS_REGISTER
Registers the error code service name.
DNS_UNREGISTER
Unregisters the error code service name. If the hsz1 parameter is 0L, all service names registered by the server will be unregistered.
DNS_FILTERON
Turns on service name initiation filtering. The filter prevents a server from receiving XTYP_CONNECT transactions for service names it has not registered. This is the default setting for this filter.
If a server application does not register any service names, the application cannot receive XTYP_WILDCONNECT transactions.
DNS_FILTEROFF
Turns off service name initiation filtering. If this flag is specified, the server receives an XTYP_CONNECT transaction whenever another DDE application calls the DdeConnect function, regardless of the service name. |
If the funcion succeeds, it returns a nonzero value. That value is not a true HDDEDATA value, merely a Boolean indicator of success. The function is typed HDDEDATA to allow for possible future expansion of the function and a more sophisticated return value.
If the function fails, the return value is 0L. |
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