之前文章调研过dxflib和libdxfrw，查找资料发现还有一个类似的库libdxf，本文初探一下这个库。
官方说明：
libDXF is a library (written in C) with DXF related functions.
The Drawing eXchange Format (DXF) is a defacto industry standard for the exchange of drawing files between various Computer Aided Drafting programs, designed by Autodesk(TM).
Currently this project has a "Work in progress" status.
The code base is still incomplete and is not debugged to an acceptable level.
You are always welcome to help with patches or bug reports :-)
For more information see the libDXF repository on Github or the project page on Launchpad.
For statistics see BlackDuck | Open HUB.
github地址：https://github.com/bert/libdxf
该项目目前正在发展中，直接的意思就是不是很成熟，有待进一步发展。
下载当前源码后解压，里面只有一个autogen.sh可用。
尝试Windows平台使用
编写CMakeLists.txt
cmake_minimum_required(VERSION 3.8.0) project(libdxf) # Find source files file(GLOB SOURCES src/*.c) # Include header files include_directories(src) # Create shared library add_library(${PROJECT_NAME} SHARED ${SOURCES}) # Install library install(TARGETS ${PROJECT_NAME} DESTINATION lib/${PROJECT_NAME}) # Install library headers file(GLOB HEADERS src/*.h) install(FILES ${HEADERS} DESTINATION include/${PROJECT_NAME})
最终生成VS2017工程，打开进行构建。
使用Qt进行编译：libdxf.pro
1 #------------------------------------------------- 2 # 3 # Project created by QtCreator 2020-02-19T09:52:44 4 # 5 #------------------------------------------------- 6 7 QT -= core gui 8 9 TARGET = libdxf 10 TEMPLATE = lib 11 CONFIG += staticlib 12 13 # The following define makes your compiler emit warnings if you use 14 # any feature of Qt which has been marked as deprecated (the exact warnings 15 # depend on your compiler). Please consult the documentation of the 16 # deprecated API in order to know how to port your code away from it. 17 DEFINES += QT_DEPRECATED_WARNINGS 18 19 # You can also make your code fail to compile if you use deprecated APIs. 20 # In order to do so, uncomment the following line. 21 # You can also select to disable deprecated APIs only up to a certain version of Qt. 22 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 23 24 SOURCES += \ 25 src/3dface.c \ 26 src/3dline.c \ 27 src/3dsolid.c \ 28 src/acad_proxy_entity.c \ 29 src/appid.c \ 30 src/arc.c \ 31 src/attdef.c \ 32 src/attrib.c \ 33 src/binary_data.c \ 34 src/binary_entity_data.c \ 35 src/binary_graphics_data.c \ 36 src/block.c \ 37 src/block_record.c \ 38 src/body.c \ 39 src/circle.c \ 40 src/class.c \ 41 src/color.c \ 42 src/comment.c \ 43 src/dictionary.c \ 44 src/dictionaryvar.c \ 45 src/dimension.c \ 46 src/dimstyle.c \ 47 src/donut.c \ 48 src/drawing.c \ 49 src/ellipse.c \ 50 src/endblk.c \ 51 src/endsec.c \ 52 src/endtab.c \ 53 src/entities.c \ 54 src/entity.c \ 55 src/file.c \ 56 src/group.c \ 57 src/hatch.c \ 58 src/header.c \ 59 src/helix.c \ 60 src/idbuffer.c \ 61 src/image.c \ 62 src/imagedef.c \ 63 src/imagedef_reactor.c \ 64 src/insert.c \ 65 src/layer.c \ 66 src/layer_index.c \ 67 src/layer_name.c \ 68 src/leader.c \ 69 src/light.c \ 70 src/line.c \ 71 src/ltype.c \ 72 src/lwpolyline.c \ 73 src/mesh.c \ 74 src/mleader.c \ 75 src/mleaderstyle.c \ 76 src/mline.c \ 77 src/mlinestyle.c \ 78 src/mtext.c \ 79 src/object.c \ 80 src/object_id.c \ 81 src/object_ptr.c \ 82 src/ole2frame.c \ 83 src/oleframe.c \ 84 src/point.c \ 85 src/polyline.c \ 86 src/proprietary_data.c \ 87 src/rastervariables.c \ 88 src/ray.c \ 89 src/region.c \ 90 src/rtext.c \ 91 src/section.c \ 92 src/seqend.c \ 93 src/shape.c \ 94 src/solid.c \ 95 src/sortentstable.c \ 96 src/spatial_filter.c \ 97 src/spatial_index.c \ 98 src/spline.c \ 99 src/style.c \ 100 src/sun.c \ 101 src/surface.c \ 102 src/table.c \ 103 src/tables.c \ 104 src/text.c \ 105 src/thumbnail.c \ 106 src/tolerance.c \ 107 src/trace.c \ 108 src/ucs.c \ 109 src/util.c \ 110 src/vertex.c \ 111 src/view.c \ 112 src/viewport.c \ 113 src/vport.c \ 114 src/xline.c \ 115 src/xrecord.c 116 117 HEADERS += \ 118 src/3dface.h \ 119 src/3dline.h \ 120 src/3dsolid.h \ 121 src/acad_proxy_entity.h \ 122 src/appid.h \ 123 src/arc.h \ 124 src/attdef.h \ 125 src/attrib.h \ 126 src/binary_data.h \ 127 src/binary_entity_data.h \ 128 src/binary_graphics_data.h \ 129 src/block.h \ 130 src/block_record.h \ 131 src/body.h \ 132 src/circle.h \ 133 src/class.h \ 134 src/color.h \ 135 src/comment.h \ 136 src/dbg.h \ 137 src/dictionary.h \ 138 src/dictionaryvar.h \ 139 src/dimension.h \ 140 src/dimstyle.h \ 141 src/donut.h \ 142 src/drawing.h \ 143 src/dxf.h \ 144 src/ellipse.h \ 145 src/endblk.h \ 146 src/endsec.h \ 147 src/endtab.h \ 148 src/entities.h \ 149 src/entity.h \ 150 src/file.h \ 151 src/global.h \ 152 src/group.h \ 153 src/hatch.h \ 154 src/header.h \ 155 src/helix.h \ 156 src/idbuffer.h \ 157 src/image.h \ 158 src/imagedef.h \ 159 src/imagedef_reactor.h \ 160 src/insert.h \ 161 src/layer.h \ 162 src/layer_index.h \ 163 src/layer_name.h \ 164 src/leader.h \ 165 src/light.h \ 166 src/line.h \ 167 src/ltype.h \ 168 src/lwpolyline.h \ 169 src/mesh.h \ 170 src/mleader.h \ 171 src/mleaderstyle.h \ 172 src/mline.h \ 173 src/mlinestyle.h \ 174 src/mtext.h \ 175 src/object.h \ 176 src/object_id.h \ 177 src/object_ptr.h \ 178 src/ole2frame.h \ 179 src/oleframe.h \ 180 src/param.h \ 181 src/point.h \ 182 src/polyline.h \ 183 src/proprietary_data.h \ 184 src/rastervariables.h \ 185 src/ray.h \ 186 src/region.h \ 187 src/rtext.h \ 188 src/section.h \ 189 src/seqend.h \ 190 src/shape.h \ 191 src/solid.h \ 192 src/sortentstable.h \ 193 src/spatial_filter.h \ 194 src/spatial_index.h \ 195 src/spline.h \ 196 src/style.h \ 197 src/sun.h \ 198 src/surface.h \ 199 src/table.h \ 200 src/tables.h \ 201 src/text.h \ 202 src/thumbnail.h \ 203 src/tolerance.h \ 204 src/trace.h \ 205 src/ucs.h \ 206 src/util.h \ 207 src/vertex.h \ 208 src/view.h \ 209 src/viewport.h \ 210 src/vport.h \ 211 src/xline.h \ 212 src/xrecord.h 213 unix { 214 target.path = /usr/lib 215 INSTALLS += target 216 } 217 218 DISTFILES += \ 219 src/Makefile.am \ 220 src/libdxf.pc.in
构建生成静态库文件libdxf.a
同样滴，例子tests.pro
1 QT -= gui 2 3 CONFIG += c++11 console 4 CONFIG -= app_bundle 5 6 # The following define makes your compiler emit warnings if you use 7 # any Qt feature that has been marked deprecated (the exact warnings 8 # depend on your compiler). Please consult the documentation of the 9 # deprecated API in order to know how to port your code away from it. 10 DEFINES += QT_DEPRECATED_WARNINGS 11 12 # You can also make your code fail to compile if it uses deprecated APIs. 13 # In order to do so, uncomment the following line. 14 # You can also select to disable deprecated APIs only up to a certain version of Qt. 15 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 16 17 SOURCES += \ 18 test_point.c \ 19 tests.c 20 21 # Default rules for deployment. 22 qnx: target.path = /tmp/$${TARGET}/bin 23 else: unix:!android: target.path = /opt/$${TARGET}/bin 24 !isEmpty(target.path): INSTALLS += target 25 26 HEADERS += \ 27 includes.h 28 29 INCLUDEPATH +=../ 30 31 win32: LIBS += -L$$PWD/../build/bin/MinGW_32_Debug/debug/ -llibdxf 32 33 INCLUDEPATH += $$PWD/../build/bin/MinGW_32_Debug/debug 34 DEPENDPATH += $$PWD/../build/bin/MinGW_32_Debug/debug 35 36 win32:!win32-g++: PRE_TARGETDEPS += $$PWD/../build/bin/MinGW_32_Debug/debug/libdxf.lib 37 else:win32-g++: PRE_TARGETDEPS += $$PWD/../build/bin/MinGW_32_Debug/debug/liblibdxf.a
Qt构建成功！test.c用于读取dxf文件，test_point.c是一个写操作例子。
1 /*! 2 * \brief Reads a dxf file using libdxf form examples dir. 3 * 4 * \version According to DXF R2000. 5 */ 6 int main (void) 7 { 8 if (dxf_file_read ("../../examples/qcad-example_R2000.dxf")) 9 fprintf (stdout, "TESTS: R2000 exited with error\n"); 10 else 11 fprintf (stdout, "TESTS: R2000 exited with no error\n"); 12 13 return 1; 14 }
但是运行时，读取dxf文件一直错误，看来这个库确实还存在不少bug，这就是所谓的“work in progress”。
期待不断完善！