Microsoft Speech Platform
ISpVoice::DisplayUI
ISpVoice::DisplayUI displays the UI from the underlying text-to-speech engine's object token.
[local] HRESULT DisplayUI(
HWND hwndParent,
LPCWSTR *pszTitle,
LPCWSTR *pszTypeOfUI,
void *pvExtraData,
ULONG cbExtraData
);
Parameters
- hwndParent
- [in] Specifies the parent window handle information.
- pszTitle
- [in] Address of a null-terminated string containing the window title information. Set this value to NULL to indicate that the TTS engine should use its default window title for this UI type.
- pszTypeOfUI
- [in] Address of the null-terminated string containing the requested UI type to display.
- pvExtraData
- [in] Pointer to additional information needed for the object. The TTS Engine implementer dictates the format and usage of the data provided.
- cbExtraData
- [in] Size, in bytes, of the ExtraData. The TTS Engine implementer dictates the format and usage of the data provided.
Return values
| Value | Description |
|---|---|
| S_OK | Function completed successfully. |
| S_FALSE | The UI is supported but not with the current run-time environment or parameters. |
| E_INVALIDARG | One or more parameters are invalid. |
| FAILED(hr) | Appropriate error message. |
Remarks
The best practice for using ISpVoice::DisplayUI is to call ISpVoice::IsUISupported with a specific UI type before calling DisplayUI.
See the TTS Engine White Paper for further information on how a TTS Engine should implement UI.
The call to DisplayUI is synchronous, so the call will not return until the UI has been closed.
Example
The following code snippet illustrates the use of ISpVoice::DisplayUI.
// Declare local identifiers:
HRESULT hr = S_OK;
CComPtr<ISpVoice> cpVoice;
HWND hwndParent;
// Display properties UI for the current TTS engine.
hr = cpVoice->DisplayUI(hwndParent, L"My App's Caption", SPDUI_EngineProperties, NULL, NULL);
if (SUCCEEDED (hr))
{
// Do some more stuff.
}