Draws a representation of an object onto the specified device context.
| DWORD dwAspect,
|//Specifies how the object is to be represented
| LONG lindex,
|//Specifies the part of the object to draw
| void * pvAspect,
| DVTARGETDEVICE * ptd,
|//Specifies the target device in a structure
| HDC hicTargetDev,
|//Specifies the information context for the target device ptd
| HDC hdcDraw,
|//Identifies the device context on which to draw
| const LPRECTL lprcBounds,
|//Specifies the rectangle in which the object is drawn
| const LPRECTL lprcWBounds,
|//Specifies the window extent and window origin when drawing a metafile
| BOOL (*) (DWORD) pfnContinue,
|//Callback function for canceling or continuing the drawing
| DWORD dwContinue
|//Parameter to pass to the callback function pfnContinue
[in]Specifies how the object is to be represented. Representations include
content, an icon, a thumbnail, or a printed document. Valid values are taken from
the enumeration DVASPECT
. See the DVASPECT
enumeration for more information.
[in]Indicates the portion of the object that is of interest for the draw
operation. Its interpretation varies depending on the value in the dwAspect
parameter. See the DVASPECT
enumeration for more information.
[in]Provides more information about the view of the object specified in dwAspect
. Since none of the current aspects support additional information; pvAspect
must always be NULL.
[in]Points to the target device structure that describes the device for which
the object is to be rendered. If NULL, the view should be rendered for the
default target device (typically the display). A value other than NULL is
interpreted in conjunction with hicTargetDev
. For example, if hdcDraw
specifies a printer as the device context, the ptd
parameter points to a structure describing that printer device. The data may
actually be printed if hicTargetDev
is a valid value or it may be displayed in print preview mode if hicTargetDev
[in]Specifies the information context for the target device indicated by the ptd
parameter from which the object can extract device metrics and test the
device's capabilities. If ptd
is NULL; the object should ignore the value in the hicTargetDev
[in]Specifies the device context on which to draw.
[in]Points to a RECTL
structure specifying the rectangle on hdcDraw
and in which the object should be drawn. This parameter controls the
positioning and stretching of the object.
is a metafile device context, the lprcWBounds
parameter points to a RECTL
structure specifying the bounding rectangle in the underlying metafile. The
rectangle structure contains the window extent and window origin. These values
are useful for drawing metafiles. The rectangle indicated by lprcBounds
is nested inside this lprcWBounds
rectangle; they are in the same coordinate space.
is not a metafile device context; lprcWBounds
will be NULL.
[in]Points to a callback function that the view object should call
periodically during a lengthy drawing operation to determine whether the operation should
continue or be canceled. This function returns TRUE to continue drawing. It
returns FALSE to stop the drawing in which case IViewObject::Draw
[in]Contains a value to pass as a parameter to the function pointed to by the pfnContinue
parameter. Typically, dwContinue
is a pointer to an application-defined structure needed inside the callback
The object was drawn successfully.
Invalid window boundaries specified for metafile device context.
Ran out of memory.
No data to draw from.
Draw operation aborted.
Error in drawing.
Invalid value for lindex
; currently only -1 is supported.
Invalid value for dwAspect
A container application issues a call to IViewObject::Draw
to create a representation of a contained object. This method draws the
specified piece (lindex
) of the specified view (dwAspect
) on the specified device context (hdcDraw
). Formatting, fonts, and other rendering decisions are made on the basis of
the target device specified by the ptd
There is a relationship between the dwDrawAspect
value and lprcbounds
value. The lprcbounds
value specifies the rectangle on hdcDraw
into which the drawing is to be mapped. For DVASPECT_THUMBNAIL,
DVASPECT_ICON, and DVASPECT_SMALLICON, the object draws whatever it wants to draw, and it
maps it into the space given in the best way. Some objects might scale to fit
while some might scale to fit but preserve aspect ratio. In addition; some might
scale so the drawing appears at full width; but the bottom is cropped. The
container can suggest a size via IOleObject::SetExtent
, but it has no control over the rendering size. In the case of
DVASPECT_CONTENT, the Draw
implementation should either use the extents given by IOleObject::SetExtent
or use the bounding rectangle given in the lprcBounds
Note to Callers
The value of hicTargetDevice
is typically an information context for the target device. However, it may be
a full device context instead.
Note to Implementors
If you are writing an object handler (such as the default handler) that
by playing a metafile, you have to treat SetPaletteEntries
metafile records in a special way because of Windows' behavior. The Windows
sets these palette entries to the foreground. You must override this default
by setting them to the background palette. Use EnumMetaFile
to do this. Enhanced metafiles are always recorded with the background
palette so there is no need to do it manually.
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