lineDial
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4/8/2010
This function dials the specified dialable number on the specified call.
Syntax
LONG WINAPI lineDial(
HCALL hCall,
LPCWSTR lpszDestAddress,
DWORD dwCountryCode
);
Parameters
- hCall
Handle to the call on which a number is to be dialed. The application must be an owner of the call. The call state of hCall can be any state except idle and disconnected.
- lpszDestAddress
Destination to be dialed using the standard dialable number format.
- dwCountryCode
Country/region code of the destination. This is used by the implementation to select the call progress protocols for the destination address. If a value of zero is specified, a service provider-defined default call progress protocol is used.
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. The following table shows the return values for this function.
| Value | Description |
|---|---|
LINEERR_ADDRESSBLOCKED |
The destination address is blocked. |
LINEERR_INVALPOINTER |
The pointer is invalid. |
LINEERR_DIALBILLING |
The dialable address parameter contains dialing control characters that are not processed by the service provider. |
LINEERR_NOMEM |
Not enough memory is available. |
LINEERR_DIALDIALTONE |
The dialable address parameter contains dialing control characters that are not processed by the service provider. |
LINEERR_NOTOWNER |
The application is not the owner of this call. |
LINEERR_DIALPROMPT |
The dialable address parameter contains dialing control characters that are not processed by the service provider. |
LINEERR_OPERATIONFAILED |
The operation failed. |
LINEERR_DIALQUIET |
The dialable address parameter contains dialing control characters that are not processed by the service provider. |
LINEERR_OPERATIONUNAVAIL |
The operation is unavailable. With code division multiple access (CDMA), this function will fail if a call is currently in progress. CDMA does not provide the necessary functionality to support the following TAPI functions:
Some cellular carriers provide equivalent functionality through the flash feature, which with TAPI 2.2 can be accessed with the lineGenerateDigits function. Because the exact flash sequences are controlled by the cellular providers, the application must be completely aware of the necessary codes implemented by the cellular providers. |
LINEERR_INVALCALLHANDLE |
The handle to the call is invalid. |
LINEERR_RESOURCEUNAVAIL |
The resources are unavailable. |
LINEERR_INVALCALLSTATE |
The call state of hCall is either idle or disconnected. |
LINEERR_UNINITIALIZED |
A parameter is uninitialized. |
LINEERR_INVALCOUNTRYCODE |
The destination country/region code is invalid. |
Remarks
If LINEERR_INVALADDRESS is returned, no dialing has been done. If LINEERR_DIALBILLING, LINEERR_DIALQUIET, LINEERR_DIALDIALTONE, or LINEERR_DIALPROMPT is returned, none of the actions otherwise performed by lineDial have occurred. For example, none of the dialable addresses prior to the offending character has been dialed, no hookswitch state has changed, and so on.
The lineDial function is used for dialing on an existing call appearance. For example, after a call has been set up for transfer or conference, a consultation call is automatically allocated, and the lineDial function would be used to perform the dialing of this consultation call. The lineDial function can be invoked multiple times in the course of multistage dialing, if the line's device capabilities allow it. Also, multiple addresses can be provided in a single dial string separated by CRLF. Service providers that provide inverse multiplexing can establish individual physical calls with each of the addresses and can return a single call handle to the aggregate of all calls to the application. All addresses would use the same country/region code.
Dialing is considered complete after the address has been passed to the service provider; not after the call is finally connected. Service providers that provide inverse multiplexing can allow multiple addresses to be provided at once. The service provider sends LINE_CALLSTATE messages to the application to inform it about the progress of the call. To abort a call attempt while a call is being established, the invoking application should use the lineDrop function.
An application can set the lpszDestAddress parameter of the lineDial function to the address of an empty string to indicate that dialing is complete, but only if the previous calls to the lineMakeCall and lineDial functions have had the strings specified by lpszDestAddress terminated with semicolons.
Note
This function is for TAPI version 2.0 and later.
Requirements
| Header | tapi.h |
| Library | coredll.lib |
| Windows Embedded CE | Windows CE 1.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |