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WM_PENEVENT Submessages
The following submessages of WM_PENEVENT require different treatment in 32-bit
applications:
PE_BEGININPUT
PE_BUFFERWARNING
PE_PENDOWN
PE_PENMOVE
PE_PENUP
PE_TERMINATED
PE_TERMINATING
In 16-bit applications, these submessages store different values in the
high-order and low-order words of their lParam:
- wParam = PE_ submessage number
- LOWORD( lParam ) = event reference or termination code
- HIWORD( lParam ) = HPCM handle
This scheme is not possible in Win32-based applications because lParam must contain a single 32-bit handle; therefore, the parameters for the
submessages listed above are arranged differently in the 32-bit Pen API:
- LOWORD( wParam ) = PE_ submessage number
- HIWORD( wParam ) = event reference or termination code
- lParam = HPCM handle
To extract data from the parameters, use the following macros defined in the
PENWIN.H header file. These macros render the differences in the parameters
transparent to an application because they automatically adjust for 16-bit or
32-bit type of programs:
Macro
| Description
| HpcmFromWpLp
| Retrieves HPCM handle returned from StartPenInput. If the application calls DoDefaultPenInput, that function calls StartPenInput internally.
| EventRefFromWpLp
| Retrieves event reference value for session returned from GetMessageExtraInfo. Both DoDefaultPenInput and StartPenInput take this value as their second argument.
| TerminationFromWpLp
| Retrieves a PCM_ value indicating the reason for termination from the
PE_TERMINATED and PE_TERMINATING submessages.
| SubPenMsgFromWpLp
| Retrieves PE_ submessage value.
|
The macros take both wParam and lParam as arguments and automatically return the desired value for both 16-bit and
32-bit applications. For example:
HPCM hpcm; // HPCM handle created by StartPenInput
LONG lInfo; // Return value from GetMessageExtraInfo
int iRet; // Error code
.
.
.
case WM_LBUTTONDOWN:
lInfo = GetMessageExtraInfo( );
if (IsPenEvent( msg, lInfo ))
{
iRet = DoDefaultPenInput( hwnd, LOWORD(lInfo) );
}
.
.
.
case WM_PENEVENT:
switch( SubPenMsgFromWpLp( wParam ) );
{
case PE_PENDOWN:
hpcm = HpcmFromWpLp( wParam, lParam );
//
// Note lInfo and EventRefFromWpLp( wParam, lParam )
// contain the same event reference value.
//
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