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GetStrokeAttributes
2.0
Retrieves information about a stroke in an HPENDATA object.
int GetStrokeAttributes( HPENDATA hpndt, UINT iStrk, LPVOID lpvBuffer, UINT uOption )
Parameters
hpndt
Handle to the HPENDATA object, which must not be compressed.
iStrk
Zero-based stroke index. If there are no strokes in the pen data, an index of
0 can be used to retrieve the default attributes for the pen data. A value of
IX_END specifies the last available stroke in the pen data.
lpvBuffer
Pointer to a structure whose type depends on uOption, or NULL if the uOption parameter does not require this buffer.
uOption
Specifies the attributes to retrieve. This parameter has one of the following
values:
Constant
| Description
| GSA_DOWN
| Retrieve the up/down state of the pen tip for this stroke. Returns 1 if the
stroke is a down-stroke or 0 if it is an up-stroke. lpvBuffer is unused and ignored.
| GSA_PENTIP
| Retrieve the pen-tip characteristics (color, width, nib) used by the stroke
specified by iStrk. lpvBuffer is a pointer to a PENTIP structure. Return value is PDR_OK.
| GSA_PENTIPCLASS
| Retrieve the pen-tip characteristics (color, width, nib), if any, for the
class of strokes of which the stroke specified by iStrk is a member. lpvBuffer is a pointer to a PENTIP structure. Return value is PDR_OK.
| GSA_RECTBOUND
| Retrieve the bounding rectangle of the specified stroke. lpvBuffer is a pointer to a RECT structure. Return value is PDR_OK.
| GSA_SELECT
| Retrieve the selection status of the specified stroke. lpvBuffer is unused and ignored. Returns a nonzero value if the stroke is selected;
otherwise, the return value is 0.
| GSA_SIZE
| Retrieve size of stroke in points and bytes. lpvBuffer is a pointer to a double-word value, or NULL. LOWORD(*(LPDWORD)lpvBuffer) is the size in points, and HIWORD(*(LPDWORD)lpvBuffer) is the size in bytes. Return value is PDR_OK.
| GSA_TIME
| Retrieve the absolute time of the stroke. lpvBuffer is a pointer to an ABSTIME structure; it cannot be NULL. The sec field specifies the number of seconds since Jan 1, 1970, and the ms field specifies the number of milliseconds offset from that time to the
beginning of the stroke. Return value is PDR_OK.
| GSA_USER
| Retrieve the user value, if any, for the stroke. lpvBuffer is a pointer to a double-word value, or NULL. Returns the number of bytes of
user data available in the stroke: 0, 1, 2, or 4.
| GSA_USERCLASS
| Retrieve the user value, if any, for the class of strokes of which the stroke
specified by iStrk is a member. lpvBuffer is a pointer to a double-word value, or NULL. The return value is 4 because
the user value in the strokes class table is a doubleword value.
|
Return Value
Returns PDR_OK or an integer value if successful, as described for the uOption parameter. If an error occurs, returns one of the following:
Constant
| Description
| PDR_COMPRESSED
| Pen data is compressed.
| PDR_ERROR
| Parameter or other unspecified error.
| PDR_MEMERR
| Memory error.
| PDR_PNDTERR
| Invalid pen data.
| PDR_STRKINDEXERR
| Invalid stroke index.
| PDR_TIMESTAMPERR
| Timing information was removed.
| PDR_VERSIONERR
| Could not convert old pen data.
|
See Also
CreatePenDataEx, GetStrokeTableAttributes, SetStrokeAttributes, SetStrokeTableAttributes, PENTIP
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