第二章：HEADER区块的结构

CAD GIS开发

已于 2025-09-03 08:27:54 修改

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分类专栏： Android开发CAD浏览与编辑DWG 文章标签： cad 开发

于 2025-09-03 07:59:17 首次发布

本文链接：https://blog.youkuaiyun.com/QWUIOP123/article/details/151134722

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DXF文件每个区块（section）的结构都是一样的：

开头五行：

1) 0 —— 标记区块开始

2) SECTION —— 区块类型

3) 2 —— 固定组码

4) 区块名称 —— 如 HEADER、TABLES 等

5）9 —— 表示“接下来是变量名”

中间内容：

每组三行表示一个变量或条目：

1) $变量名

2) 对应的组码

3) 变量的值

结尾：

1) 0 —— 标记区块结束

2) ENDSEC

DXF中HEADER的具体组码如下：

  0
SECTION
  2
HEADER
  9
$ACADVER
  1
AC1032
  9
$ACADMAINTVER
 90
        0
  9
$DWGCODEPAGE
  3
ANSI_936
  9
$LASTSAVEDBY
  1
A607
  9
$REQUIREDVERSIONS
160
           0
  9
$INSBASE
 10
0.0
 20
0.0
 30
0.0
  9
$EXTMIN
 10
61.20856112763744
 20
28.63840417868687
 30
-3.794296965313639E-07
  9
$EXTMAX
 10
198.19654316532
 20
196.0489573846228
 30
1.00000000000007
  9
$LIMMIN
 10
0.0
 20
0.0
  9
$LIMMAX
 10
12.0
 20
9.0
  9
$ORTHOMODE
 70
     0
  9
$REGENMODE
 70
     1
  9
$FILLMODE
 70
     1
  9
$QTEXTMODE
 70
     0
  9
$MIRRTEXT
 70
     0
  9
$LTSCALE
 40
1.0
  9
$ATTMODE
 70
     1
  9
$TEXTSIZE
 40
0.2
  9
$TRACEWID
 40
0.05
  9
$TEXTSTYLE
  7
Standard
  9
$CLAYER
  8
0
  9
$CELTYPE
  6
ByLayer
  9
$CECOLOR
 62
     0
  9
$CELTSCALE
 40
1.0
  9
$DISPSILH
 70
     0
  9
$DIMSCALE
 40
1.0
  9
$DIMASZ
 40
0.18
  9
$DIMEXO
 40
0.0625
  9
$DIMDLI
 40
0.38
  9
$DIMRND
 40
0.0
  9
$DIMDLE
 40
0.0
  9
$DIMEXE
 40
0.18
  9
$DIMTP
 40
0.0
  9
$DIMTM
 40
0.0
  9
$DIMTXT
 40
0.18
  9
$DIMCEN
 40
0.09
  9
$DIMTSZ
 40
0.0
  9
$DIMTOL
 70
     0
  9
$DIMLIM
 70
     0
  9
$DIMTIH
 70
     1
  9
$DIMTOH
 70
     1
  9
$DIMSE1
 70
     0
  9
$DIMSE2
 70
     0
  9
$DIMTAD
 70
     0
  9
$DIMZIN
 70
     0
  9
$DIMBLK
  1

  9
$DIMASO
 70
     1
  9
$DIMSHO
 70
     1
  9
$DIMPOST
  1

  9
$DIMAPOST
  1

  9
$DIMALT
 70
     0
  9
$DIMALTD
 70
     2
  9
$DIMALTF
 40
25.4
  9
$DIMLFAC
 40
1.0
  9
$DIMTOFL
 70
     0
  9
$DIMTVP
 40
0.0
  9
$DIMTIX
 70
     0
  9
$DIMSOXD
 70
     0
  9
$DIMSAH
 70
     0
  9
$DIMBLK1
  1

  9
$DIMBLK2
  1

  9
$DIMSTYLE
  2
Standard
  9
$DIMCLRD
 70
     0
  9
$DIMCLRE
 70
     0
  9
$DIMCLRT
 70
     0
  9
$DIMTFAC
 40
1.0
  9
$DIMGAP
 40
0.09
  9
$DIMJUST
 70
     0
  9
$DIMSD1
 70
     0
  9
$DIMSD2
 70
     0
  9
$DIMTOLJ
 70
     1
  9
$DIMTZIN
 70
     0
  9
$DIMALTZ
 70
     0
  9
$DIMALTTZ
 70
     0
  9
$DIMUPT
 70
     0
  9
$DIMDEC
 70
     4
  9
$DIMTDEC
 70
     4
  9
$DIMALTU
 70
     2
  9
$DIMALTTD
 70
     2
  9
$DIMTXSTY
  7
Standard
  9
$DIMAUNIT
 70
     0
  9
$DIMADEC
 70
     0
  9
$DIMALTRND
 40
0.0
  9
$DIMAZIN
 70
     0
  9
$DIMDSEP
 70
    46
  9
$DIMATFIT
 70
     3
  9
$DIMFRAC
 70
     0
  9
$DIMLDRBLK
  1

  9
$DIMLUNIT
 70
     2
  9
$DIMLWD
 70
    -2
  9
$DIMLWE
 70
    -2
  9
$DIMTMOVE
 70
     0
  9
$DIMFXL
 40
1.0
  9
$DIMFXLON
 70
     0
  9
$DIMJOGANG
 40
0.7853981633974483
  9
$DIMTFILL
 70
     0
  9
$DIMTFILLCLR
 70
     0
  9
$DIMARCSYM
 70
     0
  9
$DIMLTYPE
  6

  9
$DIMLTEX1
  6

  9
$DIMLTEX2
  6

  9
$DIMTXTDIRECTION
 70
     0
  9
$LUNITS
 70
     2
  9
$LUPREC
 70
     4
  9
$AXISMODE
 70
     0
  9
$AXISUNIT
 10
0.0
 20
0.0
  9
$SKETCHINC
 40
0.1
  9
$FILLETRAD
 40
0.0
  9
$AUNITS
 70
     0
  9
$AUPREC
 70
     0
  9
$MENU
  1
.
  9
$ELEVATION
 40
0.0
  9
$PELEVATION
 40
0.0
  9
$THICKNESS
 40
0.0
  9
$LIMCHECK
 70
     0
  9
$CHAMFERA
 40
0.0
  9
$CHAMFERB
 40
0.0
  9
$CHAMFERC
 40
0.0
  9
$CHAMFERD
 40
0.0
  9
$SKPOLY
 70
     0
  9
$TDCREATE
 40
2460921.528920000
  9
$TDUCREATE
 40
2460921.240920000
  9
$TDUPDATE
 40
2460921.544350000
  9
$TDUUPDATE
 40
2460921.256350000
  9
$TDINDWG
 40
0.005400000
  9
$TDUSRTIMER
 40
0.005400000
  9
$USRTIMER
 70
     1
  9
$ANGBASE
 50
0.0
  9
$ANGDIR
 70
     0
  9
$PDMODE
 70
     0
  9
$PDSIZE
 40
0.0
  9
$PLINEWID
 40
0.0
  9
$SPLFRAME
 70
     0
  9
$SPLINETYPE
 70
     6
  9
$SPLINESEGS
 70
     8
  9
$HANDSEED
  5
330
  9
$SURFTAB1
 70
     6
  9
$SURFTAB2
 70
     6
  9
$SURFTYPE
 70
     6
  9
$SURFU
 70
     6
  9
$SURFV
 70
     6
  9
$UCSBASE
  2

  9
$UCSNAME
  2

  9
$UCSORG
 10
0.0
 20
0.0
 30
0.0
  9
$UCSXDIR
 10
1.0
 20
0.0
 30
0.0
  9
$UCSYDIR
 10
0.0
 20
1.0
 30
0.0
  9
$UCSORTHOREF
  2

  9
$UCSORTHOVIEW
 70
     0
  9
$UCSORGTOP
 10
0.0
 20
0.0
 30
0.0
  9
$UCSORGBOTTOM
 10
0.0
 20
0.0
 30
0.0
  9
$UCSORGLEFT
 10
0.0
 20
0.0
 30
0.0
  9
$UCSORGRIGHT
 10
0.0
 20
0.0
 30
0.0
  9
$UCSORGFRONT
 10
0.0
 20
0.0
 30
0.0
  9
$UCSORGBACK
 10
0.0
 20
0.0
 30
0.0
  9
$PUCSBASE
  2

  9
$PUCSNAME
  2

  9
$PUCSORG
 10
0.0
 20
0.0
 30
0.0
  9
$PUCSXDIR
 10
1.0
 20
0.0
 30
0.0
  9
$PUCSYDIR
 10
0.0
 20
1.0
 30
0.0
  9
$PUCSORTHOREF
  2

  9
$PUCSORTHOVIEW
 70
     0
  9
$PUCSORGTOP
 10
0.0
 20
0.0
 30
0.0
  9
$PUCSORGBOTTOM
 10
0.0
 20
0.0
 30
0.0
  9
$PUCSORGLEFT
 10
0.0
 20
0.0
 30
0.0
  9
$PUCSORGRIGHT
 10
0.0
 20
0.0
 30
0.0
  9
$PUCSORGFRONT
 10
0.0
 20
0.0
 30
0.0
  9
$PUCSORGBACK
 10
0.0
 20
0.0
 30
0.0
  9
$USERI1
 70
     0
  9
$USERI2
 70
     0
  9
$USERI3
 70
     0
  9
$USERI4
 70
     0
  9
$USERI5
 70
     0
  9
$USERR1
 40
0.0
  9
$USERR2
 40
0.0
  9
$USERR3
 40
0.0
  9
$USERR4
 40
0.0
  9
$USERR5
 40
0.0
  9
$WORLDVIEW
 70
     1
  9
$SHADEDGE
 70
     3
  9
$SHADEDIF
 70
    70
  9
$TILEMODE
 70
     1
  9
$MAXACTVP
 70
    64
  9
$PINSBASE
 10
0.0
 20
0.0
 30
0.0
  9
$PLIMCHECK
 70
     0
  9
$PEXTMIN
 10
0.0
 20
0.0
 30
0.0
  9
$PEXTMAX
 10
0.0
 20
0.0
 30
0.0
  9
$PLIMMIN
 10
0.0
 20
0.0
  9
$PLIMMAX
 10
12.0
 20
9.0
  9
$UNITMODE
 70
     0
  9
$VISRETAIN
 70
     1
  9
$PLINEGEN
 70
     0
  9
$PSLTSCALE
 70
     1
  9
$TREEDEPTH
 70
  3020
  9
$CMLSTYLE
  2
Standard
  9
$CMLJUST
 70
     0
  9
$CMLSCALE
 40
1.0
  9
$PROXYGRAPHICS
 70
     1
  9
$MEASUREMENT
 70
     0
  9
$CELWEIGHT
370
    -1
  9
$ENDCAPS
280
     0
  9
$JOINSTYLE
280
     0
  9
$LWDISPLAY
290
     0
  9
$INSUNITS
 70
     1
  9
$HYPERLINKBASE
  1

  9
$STYLESHEET
  1

  9
$XEDIT
290
     1
  9
$CEPSNTYPE
380
     0
  9
$PSTYLEMODE
290
     1
  9
$FINGERPRINTGUID
  2
{8032F4F0-3D31-8345-8429-69DBF81A331C}
  9
$VERSIONGUID
  2
{5D5BB567-89E5-FA47-AAC7-488846011F1B}
  9
$EXTNAMES
290
     1
  9
$PSVPSCALE
 40
0.0
  9
$OLESTARTUP
290
     0
  9
$SORTENTS
280
   127
  9
$INDEXCTL
280
     0
  9
$HIDETEXT
280
     1
  9
$XCLIPFRAME
280
     2
  9
$HALOGAP
280
     0
  9
$OBSCOLOR
 70
   257
  9
$OBSLTYPE
280
     0
  9
$INTERSECTIONDISPLAY
280
     0
  9
$INTERSECTIONCOLOR
 70
   257
  9
$DIMASSOC
280
     2
  9
$PROJECTNAME
  1

  9
$CAMERADISPLAY
290
     0
  9
$LENSLENGTH
 40
50.0
  9
$CAMERAHEIGHT
 40
0.0
  9
$STEPSPERSEC
 40
2.0
  9
$STEPSIZE
 40
6.0
  9
$3DDWFPREC
 40
2.0
  9
$PSOLWIDTH
 40
0.25
  9
$PSOLHEIGHT
 40
4.0
  9
$LOFTANG1
 40
1.570796326794897
  9
$LOFTANG2
 40
1.570796326794897
  9
$LOFTMAG1
 40
0.0
  9
$LOFTMAG2
 40
0.0
  9
$LOFTPARAM
 70
     7
  9
$LOFTNORMALS
280
     1
  9
$LATITUDE
 40
37.795
  9
$LONGITUDE
 40
-122.394
  9
$NORTHDIRECTION
 40
0.0
  9
$TIMEZONE
 70
 -8000
  9
$LIGHTGLYPHDISPLAY
280
     1
  9
$TILEMODELIGHTSYNCH
280
     1
  9
$CMATERIAL
347
96
  9
$SOLIDHIST
280
     0
  9
$SHOWHIST
280
     1
  9
$DWFFRAME
280
     2
  9
$DGNFRAME
280
     0
  9
$REALWORLDSCALE
290
     1
  9
$INTERFERECOLOR
 62
   256
  9
$CSHADOW
280
     0
  9
$SHADOWPLANELOCATION
 40
0.0
  0
ENDSEC