C++ Registry::NextEntity方法代码示例

int main() {

    // This has to be done before anything else.  This initializes
    // all of the registry information for the schema you are using.
    // The SchemaInit() function is generated by exp2cxx... see
    // extern statement above.

    Registry * registry = new Registry( SchemaInit );

    // The nifty thing about the Registry is that it basically keeps a list
    // of everything in your schema.  What this means is that we can go
    // through the Registry and instantiate, say, one of everything, without
    // knowing at coding-time what entities there are to instantiate.  So,
    // this test could be linked with other class libraries produced from
    // other schema, rather than the example, and run happily.

    InstMgr instance_list;

    // Here's what's going to happen below: we're going to figure out
    // how many different entities there are, instantiate one of each and
    // keep an array of pointers to each.  We'll stick some random data in
    // them as we go.  When we're done, we'll print out everything by walking
    // the array, and then write out the STEPfile information to the screen.

    // Figure outhow many entities there are, then allocate an array
    // to store a pointer to one of each.

    int num_ents = registry->GetEntityCnt();
    STEPentity ** SEarray = new STEPentity*[num_ents];

    // "Reset" the Schema and Entity hash tables... this sets things up
    // so we can walk through the table using registry->NextEntity()

    registry->ResetSchemas();
    registry->ResetEntities();

    // Print out what schema we're running through.

    const SchemaDescriptor * schema = registry->NextSchema();
    cout << "Entities in schema " << schema->Name() << ":\n";

    // "Loop" through the schema, building one of each entity type.

    const EntityDescriptor * ent;  // needs to be declared const...
    for ( int i = 0; i < num_ents; i++ ) {
        ent = registry->NextEntity();

        // Build object, using its name, through the registry
        SEarray[i] = registry->ObjCreate( ent->Name() );

        // Add each realized entity to the instance list
        instance_list.Append( SEarray[i], completeSE );

        // Put some data into each instance
        PrintEntity( SEarray[i] );
    }

    // Print out all entities

    SEarrIterator SEitr( ( const STEPentity ** ) SEarray, num_ents );
    exit( 0 );
}