Returns a handle to an class.
If input class is zero, the handle will point to the first relevant class.
If all classes are past (or no relevant classes are found), the function will return 0.


//   Visual Studio for Windows
__int64 __declspec(dllexport) __stdcall GetClassesByIterator(
            __int64             model,
            __int64             owlClass

//   Linux, OS-X and non-Visual Studio Windows solutions
int64_t GetClassesByIterator(
            int64_t             model,
            int64_t             owlClass

Property model

Size: 64 bit / 8 byte (value)
The handle to the model. The model handle is static during its existance. Several models can be opened simultaniously within one session. Different models are always independent, threads are allowed to be running on different models simultaniously.

Property owlClass

Size: 64 bit / 8 byte (value)
This attribute represents a handle to the class. The term owl is comming from W3C, the classes follow the expression power of Semantic Web concepts, therefore classes support multiple inheritance. Technically classes can also be distributed over different resources, however for this the parametric library is required as an extension on the basic Geometry Kernel API.


Here you can find code snippits that show how the API call GetClassesByIterator can be used.

int64_t GetClassCnt(int64_t model)
    int64_t classCnt = 0,
            myIteratedClass = GetClassesByIterator(model, 0);
    while (myIteratedClass) {
        char    * className = nullptr;
        GetNameOfClass(myIteratedClass, &className);
        //  The name of the class can be checked by placing a breakpoint after this point while debugging
        myIteratedClass = GetClassesByIterator(model, myIteratedClass);

    return  classCnt;

int _tmain(int argc, _TCHAR* argv[])
    int64_t model = CreateModel();

    if (model) {
        int64_t classCnt = GetClassCnt(model);

        //  Add a new class
        CreateClass(model, "CreatedClassToTestClassCnt");

        assert(GetClassCnt(model) == classCnt + 1);

        int64_t classCntThroughAPI = 0;
        OrderedHandles(model, &classCntThroughAPI, nullptr, nullptr, 0, 0);

        assert(GetClassCnt(model) == classCntThroughAPI);


    return  0;