The IPicture interface manages a picture object and its properties. Picture objects provide a language-neutral abstraction for bitmaps, icons, and metafiles. As with the standard font object, the system provides a standard implementation of the picture object. Its primary interfaces are IPicture and IPictureDisp, the latter being derived from IDispatch to provide access to the picture's properties through Automation. A picture object is created with OleCreatePictureIndirect.
The picture object also supports the outgoing interface IPropertyNotifySink, so a client can determine when picture properties change. Since the picture object supports at least one outgoing interface, it also implements IConnectionPointContainer and its associated interfaces for this purpose.
The picture object also supports IPersistStream so it can save and load itself from an instance of IStream. An object that uses a picture object internally would normally save and load the picture as part of the object's own persistence handling. The function OleLoadPicture simplifies the creation of a picture object based on stream contents.
Typically, you use the OLE-provided picture object, which provides the IPicture and IPictureDisp interfaces for you. The IPicture interface is the primary interface implemented by the OLE-provided picture object. It allows the caller to manage picture properties and to use that picture in graphical rendering. Each property in the IPicture interface includes a get_PropertyName method if the property supports read access and a put_PropertyName method if the property supports write access. Most of the properties support only read access with the exception of hPal.
Property |
Type |
Access Allowed | Description |
|---|---|---|---|
| HANDLE | OLE_HANDLE (int) | R | The Windows GDI handle of the picture |
| hPal | OLE_HANDLE (int) | RW | The Windows handle of the palette used by the picture |
| Type | short | R | The type of picture (see below) |
| Width | OLE_XSIZE_HIMETRIC (long) | R | The width of the picture |
| Height | OLE_YSIZE_HIMETRIC (long) | R | The height of the picture |
| CurDC | HDC | R | The current device context |
| KeepOriginalFormat | BOOL | RW | If TRUE, the picture object maintains the entire original state of the picture in memory. If FALSE, any state not applicable to the user's machine is discarded |
| Attributes | DWORD | R | Miscellaneous bit attributes of the picture (see below) |
Use this interface to change the properties of a picture object.
| IUnknown Methods | Description |
|---|---|
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments reference count. |
| Release | Decrements reference count. |
| IPicture Methods | Description |
|---|---|
| get_Handle | Returns the Windows GDI handle of the picture managed within this picture object. |
| get_Hpal | Returns a copy of the palette currently used by the picture object. |
| get_Type | Returns the current type of the picture. |
| get_Width | Returns the current width of the picture in the picture object. |
| get_Height | Returns the current height of the picture in the picture object. |
| Render | Draws the specified portion of the picture onto the specified device context, positioned at the specified location. |
| set_Hpal | Sets the current palette of the picture. |
| get_CurDC | Returns the current device context into which this picture is selected. |
| SelectPicture | Selects a bitmap picture into a given device context, returning the device context in which the picture was previously selected as well as the picture's GDI handle. |
| get_KeepOriginalFormat | Returns the current value of the picture object's KeepOriginalFormat property. |
| put_KeepOriginalFormat | Sets the picture object's KeepOriginalFormat property. |
| PictureChanged | Notifies the picture object that its picture resource changed. |
| SaveAsFile | Saves the picture's data into a stream in the same format that it would save itself into a file. |
| get_Attributes | Returns the current set of the picture's bit attributes. |
Windows NT: Use version 4.0 or later.
Windows: Use Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in ocidl.h.
IPicture - Ole Implementation, IPictureDisp