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| 02.08.2000 |
| Zu Windows Meta File: 4 verschieden Typen (von: GA, 15:09:15) | « ^ » |
| File Organization
A metafile is comprised of one or two information headers and an array of variable-length records that store the GDI function call information. There are four flavors of Windows metafiles: standard, placeable, clipboard, and enhanced. A standard metafile contains an 18-byte WMF header followed by one or more records of GDI commands. A placeable metafile contains a 22-byte header followed by the standard 18-byte WMF header and GDI command records. Clipboard metafiles contains a 8-byte (Win16) or 16-byte (Win32) header that precedes the standard metafile header. Enhanced metafiles contain only EMF records, with the first record storing the header information. EMF files are not compatible in design with the other types of WMF metafiles. Windows Metafiles (Figure Microsoft Windows Metafile-1) contain a header, followed by one or more records of data. The header contains a description of the record data stored in the metafile. Each record is a binary-encoded Microsoft Windows Graphics Device Interface (GDI) function call. The GDI is used by Windows to perform all output to a window, printer, or other output device. When the metafile data is rendered (or played back, in Microsoft terminology), the data from each record is used to perform the appropriate GDI function call to render each object stored in the file. The last record in the file contains information indicating that the end of the record data has been reached. Placeable metafiles (Figure Microsoft Windows Metafile-2) are WMF files with an 18-byte header prepended. This preheader contain information used to describe the position of the metafile drawing on the printed page (something that the original WMF file designers did not think of). Clipboard metafiles (Figure Microsoft Windows Metafile-3) are similar to placeable metafiles in that that also contain an extra header prepended to a WMF file. The Clipboard preheader contains information used to describe the position of the metafile on the Windows Clipboard and the mapping mode used to playback the data. Enhanced metafiles (Figure Microsoft Windows Metafile-4) have the same basic format of WMF files: a header followed by one or more records of drawing objects stored as GDI commands. Unlike WMF, the header is also stored in a record which appears as the first record in each EMF file. The EMF header now contains additional information, including the position and mapping information stored in the placeable and clipboard metafile preheaders. EMF also adds the features of a file description string and a programmable color palette to the metafile format. File Details The standard Windows metafile header is 18 bytes in length and is structured as follows: typedef struct _WindowsMetaHeader { WORD FileType; /* Type of metafile (0=memory, 1=disk) */ WORD HeaderSize; /* Size of header in WORDS (always 9) */ WORD Version; /* Version of Microsoft Windows used */ DWORD FileSize; /* Total size of the metafile in WORDs */ WORD NumOfObjects; /* Number of objects in the file */ DWORD MaxRecordSize; /* The size of largest record in WORDs */ WORD NumOfParams; /* Not Used (always 0) */ } WMFHEAD; FileType contains a value which indicates the location of the metafile data. A value of 0 indicates that the metafile is stored in memory, while a 1 indicates that it is stored on disk. HeaderSize contains the size of the metafile header in 16-bit WORDs. This value is always 9. Version stores the version number of Microsoft Windows that created the metafile. This value is always read in hexadecimal format. For example, in a metafile created by Windows 3.0 and 3.1, this item would have the value 0x0300. FileSize specifies the total size of the metafile in 16-bit WORDs. NumOfObjects specifies the number of objects that are in the metafile. MaxRecordSize specifies the size of the largest record in the metafile in WORDs. [ Leser: 47 ] |
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| Traudel | 139 | 27.07.2000 | 22:11 |
| Jan Arne Petersen | 130 | 28.07.2000 | 00:30 |
| GA | 101 | 28.07.2000 | 11:57 |
| Klaus Staedtler | 87 | 28.07.2000 | 17:19 |
| Andreas Schnellbacher | 74 | 29.07.2000 | 20:50 |
| Christian/2 | 63 | 01.08.2000 | 22:53 |
| Cornelis Bockemühl | 65 | 02.08.2000 | 08:58 |
| Andreas Schnellbacher | 58 | 02.08.2000 | 14:06 |
| GA | 54 | 02.08.2000 | 14:44 |
| GA | 51 | 02.08.2000 | 14:46 |
| GA | 51 | 02.08.2000 | 14:52 |
| GA | 50 | 02.08.2000 | 15:03 |
| GA | 47 | 02.08.2000 | 15:09 |
| Klaus Staedtler | 44 | 02.08.2000 | 21:33 |
| Cornelis Bockemühl | 41 | 03.08.2000 | 10:41 |
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