计算圆弧起始角度

//CESHI_ARC

// Mandatory UF Includes
#include "C:\\all_uf.h"
#include <uf.h>
#include <uf_modl.h>
#include <uf_disp.h>
#include<vector>
// Internal Includes
#include <NXOpen/ListingWindow.hxx>
#include <NXOpen/NXMessageBox.hxx>
#include <NXOpen/UI.hxx>

// Internal+External Includes
#include <NXOpen/Annotations.hxx>
#include <NXOpen/Assemblies_Component.hxx>
#include <NXOpen/Assemblies_ComponentAssembly.hxx>
#include <NXOpen/Body.hxx>
#include <NXOpen/BodyCollection.hxx>
#include <NXOpen/Face.hxx>
#include <NXOpen/Line.hxx>
#include <NXOpen/NXException.hxx>
#include <NXOpen/NXObject.hxx>
#include <NXOpen/Part.hxx>
#include <NXOpen/PartCollection.hxx>
#include <NXOpen/Session.hxx>
#include <uf_defs.h>
#include <NXOpen/NXException.hxx>
#include <NXOpen/ModelingView.hxx>
#include <NXOpen/ModelingViewCollection.hxx>
#include <NXOpen/Part.hxx>
#include <NXOpen/PartCollection.hxx>

#include <NXOpen/Session.hxx>
#include <NXOpen/UI.hxx>
#include <NXOpen/selection.hxx>
#include <NXOpen/Features_Feature.hxx>
#include <NXOpen/Part.hxx>
#include <NXOpen/PartCollection.hxx>
#include <NXOpen/ListingWindow.hxx>
#include <NXOpen/NXObject.hxx>
#include <NXOpen/NXObjectManager.hxx>

// Std C++ Includes
#include <iostream>
#include <sstream>

using namespace NXOpen;
using std::string;
using std::exception;
using std::stringstream;
using std::endl;
using std::cout;
using std::cerr;


//------------------------------------------------------------------------------
// NXOpen c++ test class 
//------------------------------------------------------------------------------
class C_ARC
{
    // class members
public:
    static Session *theSession;
    static UI *theUI;


    C_ARC();
    ~C_ARC();

    void do_it();
    void print(const NXString &);
    void print(const string &);
    void print(const char*);

private:
    Part *workPart, *displayPart;
    NXMessageBox *mb;
    ListingWindow *lw;
};

//------------------------------------------------------------------------------
// Initialize static variables
//------------------------------------------------------------------------------
Session *(C_ARC::theSession) = NULL;
UI *(C_ARC::theUI) = NULL;

//------------------------------------------------------------------------------
// Constructor 
//------------------------------------------------------------------------------
C_ARC::C_ARC()
{


    // Initialize the NX Open C++ API environment
    C_ARC::theSession = NXOpen::Session::GetSession();
    C_ARC::theUI = UI::GetUI();
    mb = theUI->NXMessageBox();
    lw = theSession->ListingWindow();

    workPart = theSession->Parts()->Work();
    displayPart = theSession->Parts()->Display();



    
}

//------------------------------------------------------------------------------
// Destructor
//------------------------------------------------------------------------------
C_ARC::~C_ARC()
{
}

//------------------------------------------------------------------------------
// Print string to listing window or stdout
//------------------------------------------------------------------------------
void C_ARC::print(const NXString &msg)
{
    if(! lw->IsOpen() ) lw->Open();
    lw->WriteLine(msg);
}
void C_ARC::print(const string &msg)
{
    if(! lw->IsOpen() ) lw->Open();
    lw->WriteLine(msg);
}
void C_ARC::print(const char * msg)
{
    if(! lw->IsOpen() ) lw->Open();
    lw->WriteLine(msg);
}

//预选高亮
static int select_filter_proc_fn(tag_t object, int type[3], void* user_data, UF_UI_selection_p_t select)
{
    if (object == NULL)
    {
        return UF_UI_SEL_REJECT;
    }
    else
    {
        return UF_UI_SEL_ACCEPT;
    }
}


static int init_proc(UF_UI_selection_p_t select, void* user_data)
{
    int num_triples = 2;//可选类型的数量
    UF_UI_mask_t mask_triples[] = { UF_solid_type,UF_solid_edge_subtype,3,
    UF_circle_type, UF_circle_open_subtype ,0};;//可选对象类型
    UF_UI_set_sel_mask(select, UF_UI_SEL_MASK_CLEAR_AND_ENABLE_SPECIFIC, num_triples, mask_triples);
    if ((UF_UI_set_sel_procs(select, select_filter_proc_fn, NULL, user_data)) == 0)
    {
        return UF_UI_SEL_SUCCESS;
    }
    else
    {
        return UF_UI_SEL_FAILURE;
    }
}

//------------------------------------------------------------------------------
// Do something
//------------------------------------------------------------------------------
void C_ARC::do_it()
{

    // TODO: add your code here
    UF_initialize();

    //单对象选择对话框
    char sCue[] = "单对象选择对话框";
    char sTitle[] = "单对象选择对话框";
    int iScope = UF_UI_SEL_SCOPE_NO_CHANGE;
    int iResponse;
    tag_t tObject;
    tag_t tView;
    double adCursor[3];
L01:
    UF_UI_select_with_single_dialog(sCue, sTitle, iScope, init_proc, NULL, &iResponse, &tObject, adCursor, &tView);
    UF_CURVE_arc_t Obj_data;
    UF_CURVE_ask_arc_data(tObject, &Obj_data);
    char aa[256];
    if (tObject > 0)
    {
        double Sp = Obj_data.start_angle / PI * 180.0;
        double Ep = Obj_data.end_angle / PI * 180.0;
        double rad = Obj_data.radius * 2;

        sprintf(aa, "开始角度：%f\n结束角度：%f\n直径：%f", Sp, Ep, rad);
        uc1601(aa, 1);
    }
    UF_DISP_set_highlight(tObject, 0);


    
    if (iResponse == UF_UI_CANCEL)
    {
        return;
    }
    else
    {
        goto L01;
    }

    UF_terminate();
}

//------------------------------------------------------------------------------
// Entry point(s) for unmanaged internal NXOpen C/C++ programs
//------------------------------------------------------------------------------
//  Explicit Execution
extern "C" DllExport void ufusr( char *parm, int *returnCode, int rlen )
{
    try
    {
        



        // Create NXOpen C++ class instance
        C_ARC *theC_ARC;
        theC_ARC = new C_ARC();
        theC_ARC->do_it();
        delete theC_ARC;
    }
    catch (const NXException& e1)
    {
        UI::GetUI()->NXMessageBox()->Show("NXException", NXOpen::NXMessageBox::DialogTypeError, e1.Message());
    }
    catch (const exception& e2)
    {
        UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, e2.what());
    }
    catch (...)
    {
        UI::GetUI()->NXMessageBox()->Show("Exception", NXOpen::NXMessageBox::DialogTypeError, "Unknown Exception.");
    }
}


//------------------------------------------------------------------------------
// Unload Handler
//------------------------------------------------------------------------------
extern "C" DllExport int ufusr_ask_unload()
{
    return (int)NXOpen::Session::LibraryUnloadOptionImmediately;
}

部分代码转自https://www.cnblogs.com/nxopen2018/p/10957188.html卢尚宇