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SetRecogHook
- 0 2.0
Installs and removes a recognition hook. This function works only for Pen API
version 1.0 recognizers accessed through Recognize or RecognizeData.
Note This function is provided only for compatibility with version 1.0 of the Pen
API and will not be supported in future versions. Use SetResultsHookHREC instead.
BOOL SetRecogHook( UINT uScope, UINT uSetOp, HWND hwndHook )
Parameters
uScope
Scope of hook. The hook parameter uSetOp determines the scope of the hook. The following table lists the HWR_ values
for uSetOp:
Constant
| Description
| HWR_RESULTS
| The hook window receives a WM_HOOKRCRESULT message before a WM_RCRESULT
message is sent to the target window.
| HWR_APPWIDE
| The hook window receives the message WM_HOOKRCRESULT before a WM_RCRESULT
message is sent to the target window if the target window belongs to the same task
as the window that set an HWR_APPWIDE hook. This is useful for implementing
application-wide gestures.
The RCRT_ALREADYPROCESSED flag is set in the wResultsType member of the RCRESULTS structure sent with WM_RCRESULT if an application-wide hook has already
processed the data.
|
uSetOp
Parameter to determine whether hook is set or removed. The operation parameter uSetOp determines whether the hook is set or removed. The following table lists the
HKP_ values for uScope:
Constant
| Description
| HKP_SETHOOK
| Installs a hook.
| HKP_UNHOOK
| Removes function from hook list.
|
hwndHook
Handle to a window.
Return Value
Returns TRUE if successful; otherwise, FALSE.
Comments
SetRecogHook enables a version 1.0 application to examine the results of recognition
before they are sent to the target application.
The hook message is WM_HOOKRCRESULT. The wParam and lParam parameters are the same as for the WM_RCRESULT message. If the window
procedure that receives the WM_HOOKRCRESULT message returns FALSE, the message
WM_HOOKRCRESULT is not sent to any of the remaining hooks in the chain.
No drawing should occur during the processing of the WM_HOOKRCRESULT and
before recognition is complete. Drawing at these times could cause timing problems,
with ink reappearing in formerly invisible controls as they are redrawn.
See Also
SetResultsHookHREC
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