AutoCAD® 2002 - Autodesk

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In all environments, arbitrary handles can be exchanged for entity names of the current drawing by means of the handent functions. A common usage of arbitrary handles is to refer to objects in external DXF and DWG files. 1005 Group Codes 1005 xdata group codes have the same behavior and semantics as soft pointers, which means that they are translated whenever the host object is merged into a different drawing. However, 1005 items are not translated to sessionpersistent identifiers, internally entity names in AutoLISP and ObjectARX. They are stored as handles. Subclass Markers When filing a stream of group data, a single object may be composed of several filer members, one for each level of inheritance where filing is done. Since derived classes and levels of inheritance can evolve separately, the data of each class filer member must be segregated from other members. This is achieved using subclass markers. All class filer members are expected to precede their class-specific portion of instance data with a “subclass” marker—a 100 group code followed by a string with the actual name of the class. This does not affect the state needed to define the object’s state, but it provides a means for the DXF file parsers to direct the group codes to the corresponding application software. For example, an object that has data from different derived classes would be represented as follows: 168 | Appendix B Advanced DXF Issues
999 FOOGRANDCHILD, defined by class AcDbSonOfSonOfFoo, which 999 is derived from AcDbSonOfFoo 0 FOOGRANDCHILD 5 C2 100 AcDbFoo 999 Uses 10/20/30 group codes 10 1.1 20 2.3 30 7.3 100 AcDbSonOfFoo 999 Also uses 10/20/30 group codes, for a different purpose 10 1.1 20 2.3 30 7.3 100 AcDbSonOfSonOfFoo 999 Also uses 10/20/30 group codes, for yet another purpose 10 13.2 20 23.1 30 31.2 999 Now for the Xdata 1001 APP_1 1070 45 1001 APP_2 1004 18A5B3EF2C199A Subclass Markers | 169
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AutoCAD ® 2002 DXF Reference Guide
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Contents Revisions to the DXF Refer
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LWPOLYLINE . . . . . . . . . . . .
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Revisions to the DXF Reference This
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Objects Section | 3
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Organization of This Reference The
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Group code value types (continued)
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Group codes by number (continued) G
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HEADER Section Group Codes The foll
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DXF system variables (continued) Va
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Page 34 and 35:
the values in the VPORT table entri
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CLASSES Section 3 The group codes d
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Default Class Values AutoCAD regist
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TABLES Section 4 The group codes de
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Group codes that apply to all symbo
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APPID group codes Group codes Descr
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DIMSTYLE group codes (continued) Gr
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DIMSTYLE group codes (continued) Gr
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LTYPE The following group codes app
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STYLE group codes (continued) Group
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Each 71/13,23,33 pair defines the U
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VIEW with UCS group codes Group cod
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VPORT group codes (continued) Group
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BLOCKS Section 5 The group codes de
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Block group codes (continued) Group
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ENTITIES Section 6 This chapter pre
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Group codes that apply to all graph
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3DSOLID The following group codes a
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Arc group codes (continued) Group c
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page 60. For information about abbr
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CIRCLE The following group codes ap
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Common dimension group codes (conti
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and formatting used in this table,
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Angular dimension group codes (cont
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For information about abbreviations
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For information about abbreviations
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Hatch boundary path data group code
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Spline edge data group codes (conti
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Image group codes (continued) Group
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Leader group codes (continued) Grou
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Lwpolyline group codes Group codes
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Mline group codes (continued) Group
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Mtext group codes (continued) Group
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Ole2frame group codes (continued) G
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POLYLINE The following group codes
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ordering. Programs that generate po
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Shape group codes (continued) Group
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Spline group codes (continued) Grou
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Text group codes (continued) Group
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Trace group codes (continued) Group
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VIEWPORT index is negative, the edg
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Viewport group codes (continued) Gr
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XLINE The following group codes app
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OBJECTS Section 7 This chapter pres
Page 123 and 124: Common object group codes Group cod
Page 125 and 126: ACDBDICTIONARYWDFLT group codes Gro
Page 127 and 128: DICTIONARY group codes (continued)
Page 129 and 130: DIMASSOC group codes (continued) Gr
Page 131 and 132: IDBUFFER The following group codes
Page 133 and 134: IMAGEDEF_REACTOR group codes Group
Page 135 and 136: LAYOUT group codes (continued) Grou
Page 137 and 138: MLINESTYLE The following group code
Page 139 and 140: OBJECT_PTR group codes (continued)
Page 141 and 142: PLOTSETTINGS group codes (continued
Page 143 and 144: SPATIAL_INDEX group codes (continue
Page 145 and 146: SORTENTSTABLE group codes Group cod
Page 147 and 148: Xrecord group codes Group codes Des
Page 149 and 150: THUMBNAILIMAGE Section 8 This chapt
Page 151 and 152: Drawing Interchange File Formats A
Page 153 and 154: ■ ■ ■ ■ VIEW (view table) V
Page 155 and 156: Symbol Table Group Codes in DXF Fil
Page 157 and 158: 0 STYLE Second entry begins. No xda
Page 159 and 160: Entity Group Codes in DXF Files The
Page 161 and 162: ' ReadDXF extracts specified code/v
Page 163 and 164: The following Visual Basic subrouti
Page 165 and 166: Slide Files The type of data follow
Page 167 and 168: Slide file data records (continued)
Page 169 and 170: Old slide file header (continued) F
Page 171 and 172: Advanced DXF Issues B This appendix
Page 173: NOTE If you use 1005 xdata group co
Page 177 and 178: 1001 AME_SOL 1002 { 1070 0 1071 1.9
Page 179 and 180: Extended data group codes and descr
Page 181 and 182: Arbitrary Axis Algorithm The arbitr
Page 183 and 184: Index *Model_Space block definition
Page 185 and 186: DIMTIH DXF system variable, 20 DIMT
Page 187 and 188: pointer references vs. ownership re
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AutoCAD® 2002 - Autodesk

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