lineReleaseUserUserInfo function (tapi.h)
The lineReleaseUserUserInfo function informs the service provider that the application has processed the user-user information contained in the LINECALLINFO structure, and that subsequently received user-user information can now be written into that structure. The service provider sends a LINE_CALLINFO message indicating LINECALLINFOSTATE_USERUSERINFO when new information is available.
Syntax
LONG lineReleaseUserUserInfo(
HCALL hCall
);
Parameters
hCall
Handle to the call. The application must be an owner of the call. The call state of hCall can be any state.
Return value
Returns a positive request identifier if the function is completed asynchronously or a negative error number if an error occurs. The dwParam2 parameter of the corresponding LINE_REPLY message is zero if the function succeeds or it is a negative error number if an error occurs. Possible return values are:
LINEERR_INVALCALLHANDLE, LINEERR_OPERATIONFAILED, LINEERR_NOMEM, LINEERR_RESOURCEUNAVAIL, LINEERR_NOTOWNER, LINEERR_UNINITIALIZED, LINEERR_OPERATIONUNAVAIL.
Remarks
The lineReleaseUserUserInfo function allows the application to control the flow of incoming user-user information on an ISDN connection. When a new, complete user-user information message is received, the service provider informs the application using a LINE_CALLINFO message (specifying LINECALLINFOSTATE_USERUSERINFO). Any number of applications can examine the information (using lineGetCallInfo), but the application owning the call controls when the information is released so that subsequent information can be reported. The service provider will not overwrite previous user-user information in LINECALLINFO with newer information until after lineReleaseUserUserInfo has been called. It is the responsibility of the service provider to buffer subsequently received user-user information until the previous information is released by the application owning the call.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | tapi.h |
| Library | Tapi32.lib |
| DLL | Tapi32.dll |