A MetafileHeader structure stores properties of an associated metafile.

 

FreeBASIC 语法

 

UNION MetafileHeader_UNION

WmfHeader AS METAHEADER

EmfHeader AS ENHMETAHEADER3

END UNION

 

TYPE MetafileHeader

Type_ AS MetafileType            ' // The type of the associated metafile

Size AS UINT            ' // Size of the metafile (in bytes)

Version AS UINT          ' // EMF+, EMF, or WMF version

EmfPlusFlags AS UINT

DpiX AS REAL

DpiY AS REAL

X AS INT_                 ' // Bounds in device units

Y AS INT_

Width AS INT_

Height AS INT_

union

WmfHeader as METAHEADER

EmfHeader as ENHMETAHEADER3

end union

EmfPlusHeaderSize AS INT_ ' // size of the EMF+ header in file

LogicalDpiX AS INT_       ' // Logical Dpi of reference Hdc

LogicalDpiY AS INT_       ' // usually valid only for EMF+

END TYPE

 

备注

 

Metafiles provide a device-independent and application-independent way to share pictures. They contain records that describe a sequence of graphics application programming interfaces (APIs) to invoke in a particular order with their associated graphics data. Metafiles can be recorded by an application and later played back by that application or by another one to reproduce a particular picture. They can also be used to send content to a print spooler. Enhanced metafiles support the ability to provide both Microsoft Windows GDI+ and Windows Graphics Device Interface (GDI) descriptions of the same picture so that both GDI+ and down-level GDI applications can render it.