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Microsoft Speech SDK
SAPI 5.1
ISpNotifyTranslator::InitCallback
ISpNotifyTranslator::InitCallback sets up this instance to send notifications using a standard C-style callback function.
HRESULT InitCallback(
SPNOTIFYCALLBACK *pfnCallback,
WPARAM wParam,
LPARAM lParam
);
Parameters
- pfnCallback
- [in] The notification callback function to be used.
- wParam
- [in] Constant WPARAM value that will be passed to the pfnCallback function when it is called.
- lParam
- [in] Constant LPARAM value that will be passed to the pfnCallback function when it is called.
Return values
Value |
Description |
S_OK |
Function completed successfully. |
SPERR_ALREADY_INITIALIZED |
SpTranslator object is already initialized. |
E_INVALIDARG |
pfnCallback is invalid or bad. |
FAILED(hr) |
Appropriate error message. |
Remarks
The translator implementation uses a hidden window to call back the client on the same thread that was used to initialize the event source. Notify callbacks are the result of processing a window message. When this notification mechanism is used:
- The SPNOTIFYCALLBACK method will always be called on the thread that initialized the event source or notify translator object.
- The thread must have a window message pump.
The SPNOTIFYCALLBACK function is declared as follows:
typedef void __stdcall SPNOTIFYCALLBACK(WPARAM wParam, LPARAM
lParam);
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