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layout docs
permalink /docs/p21_cpp_example/
title Minimal Part 21 C++ example

Based on P21read

Contents

  • TOC {:toc}

Code

{% highlight cpp linenos %} #include <sc_cf.h> extern void SchemaInit( class Registry & ); #include <STEPfile.h> #include <sdai.h> #include <STEPattribute.h> #include <ExpDict.h> #include <Registry.h> #include <errordesc.h> #ifdef HAVE_UNISTD_H

include <unistd.h>

#endif

int main( int argc, char * argv[] ) {

// the registry contains information about types present in the current schema; SchemaInit 
// is a function in the schema-specific SDAI library
Registry  registry( SchemaInit );

//the InstMgr holds instances that have been created or that have been loaded from a file
InstMgr   instance_list;

// STEPfile takes care of reading and writing Part 21 files
STEPfile  sfile( registry, instance_list, "", false );

// read a file, using the name from the command line
sfile.ReadExchangeFile( argv[1] );

// check for errors; exit if they are particularly severe
if( sfile.Error().severity() < SEVERITY_USERMSG ) {
    sfile.Error().PrintContents( cout );
}
if ( sfile.Error().severity() <= SEVERITY_INCOMPLETE ) {
    exit(1);
}

/**************************************************
** do something with the data here
***************************************************/

// write to "file.out", then check for write errors. The write operation overwrites any
// errors caused by previous operations.
sfile.WriteExchangeFile( "file.out" );
if( sfile.Error().severity() < SEVERITY_USERMSG ) {
    sfile.Error().PrintContents( cout );
}

} {% endhighlight %}

Include Paths

Stepcode's includes are not relative the top level of the stepcode include directory, so multiple include paths are needed to compile this example:

  • include/stepcode
  • include/stepcode/cldai
  • include/stepcode/cleditor
  • include/stepcode/clstepcore
  • include/stepcode/clutils

Linking

Your executable will need to link to various libraries, likely including a generated library, specific to the schema you are interested in. Once generated, this lib can be found in build/lib with a prefix of libsdai_.

It will also need to link with cldai, cleditor, clstepcore, and clutils - all found in build/lib.

If you get stuck, consider examining the compile/link commands used for one of the p21read executables. This can be done with make VERBOSE=1_:

make VERBOSE=1 p21read_sdai_ap214e3

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