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.
HDDEDATA DdeNameService( DWORD idInst, HSZ hsz1, HSZ hsz2, UINT afCmd );
The application instance identifier obtained by a previous call to the DdeInitialize function.
A handle to 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.
Reserved; should be set to 0L.
The service name options. This parameter can be one of the following values.
||Registers the error code service name.|
||Unregisters the error code service name. If the hsz1 parameter is 0L, all service names registered by the server will be unregistered.|
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.
||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 function 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.
The DdeGetLastError function can be used to get the error code, which can be one of the following values:
The service name identified by the hsz1 parameter should be a base name (that is, the name should contain no instance-specific information). The system generates an instance-specific name and sends it along with the base name during the XTYP_REGISTER and XTYP_UNREGISTER transactions. The receiving applications can then connect to the specific application instance.
|Minimum supported client||Windows 2000 Professional [desktop apps only]|
|Minimum supported server||Windows 2000 Server [desktop apps only]|
|Header||ddeml.h (include Windows.h)|