srv_wsendmsg (Extended Stored Procedure API)
Applies to: 
SQL Server
Important
This feature will be removed in a future version of SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use CLR integration instead.
Sends a Unicode message to the client.
Syntax
int srv_wsendmsg(SRV_PROC *
srvproc
, int
msgnum
, int
severity
, WCHAR *
message
, int
msglen
);
Arguments
srvproc
Is a pointer to the SRV_PROC structure that is the handle for a particular client connection. The structure contains information the Extended Stored Procedure API library uses to manage communication and data between the application and the client.
Msgnum
Is a 4-byte message number.
Severity
Specifies the severity of the error. A severity less than or equal to 10 is considered an informational message; otherwise, it is an error.
message
Is a pointer to a Unicode string to be sent to the client.
msglen
Specifies the length, in characters, of message.
Returns
SUCCEED or FAIL.
Remarks
Use this function to send messages in Unicode. It is similar to srv_sendmsg, but the message it sends is a WCHAR string rather than type DBCHAR string. Note that message length is reported in characters rather than bytes, and msglen will never be equal to SRV_NULLTERM.
The function returns FAIL when
The msglen given is not in the range of 0-32242.
The msglen given is 0 but the message pointer is NULL.
There is error when sending the error message through network.
Important
You should thoroughly review the source code of extended stored procedures, and you should test the compiled DLLs before you install them on a production server. For information about security review and testing, see this Microsoft Web site.