I got this error message when trying to turn a GUI program using FLTK in Visual Studio:
Unhandled exception at 0x01461B19 in chapter13ex2.exe: 0xC000041D: An unhandled exception was encountered during a user callback. occurred
The code in the FLTK library that triggered it seems to be:
void Fl_Graphics_Driver::transformed_vertex0(COORD_T x, COORD_T y) {
if (!n || x != p[n-1].x || y != p[n-1].y) {
if (n >= p_size) {
p_size = p ? 2*p_size : 16; p = (XPOINT*)realloc((void*)p, p_size*sizeof(*p)); } p[n].x = x; p[n].y = y; n++; }}
My own code uses FLTK indirectly through a user facility provided by the Dr. Stroustrup's website for his book
Programming: Principles and Practice Using C++ 2nd Edition.
This is my code:
// Osman Zakir
// 5 / 21 / 2017
// Bjarne Stroustrup: Programming: Principles and Programming Using C++ 2nd Edition
// Chapter 13 Exercise 2
// Exercise Specifications:
/**
* Draw a box with rounded corners. Define a class Box, consisting of four
* lines and four arcs.
*/
#include <iostream>
#include "../../Graph.h"
#include "../../Simple_window.h"
struct Box : Graph_lib::Shape
{
Box::Box(Graph_lib::Point tl, int side)
: m_tl{tl}, m_side{side} {}
void draw_lines() const;
int get_side() const { return m_side; }
private:
Graph_lib::Point m_tl;
int m_side;
};
int main()
{
using namespace std;
using namespace Graph_lib;
const Point tl{ 100, 100 };
constexpr int win_width = 600, win_height = 400;
Simple_window win(tl, win_width, win_height, "Rounded-Corner Boxes");
Point box_tl{ 250, 400 };
int side = 50;
Box box1{ box_tl, side };
box1.set_color(Color::black);
win.attach(box1);
win.wait_for_button();
}
void Box::draw_lines() const
{
// make the points
Graph_lib::Point tr = m_tl;
tr.x += get_side(); // top-right corner
Graph_lib::Point br = tr;
br.y += get_side(); // bottom-right corner
Graph_lib::Point bl = br; bl.x -= get_side(); // bottom-left corner
// draw the lines const
int space = get_side() / 10; // leave space for arcs
fl_line(m_tl.x + space, m_tl.y, tr.x - space, tr.y);
fl_line(tr.x, tr.y + space, br.x, br.y - space);
fl_line(br.x - space, br.y, bl.x + space, bl.y);
fl_line(bl.x, bl.y - space, m_tl.x, m_tl.y + space);
// draw the arcs
const double x1 = static_cast<double>(m_tl.x);
const double y1 = static_cast<double>(m_tl.y);
const double radius = static_cast<double>(get_side());
const double start_deg = 0.0;
const double end_deg = 90.0;
fl_arc(x1, y1, radius, start_deg, end_deg);
const double x2 = static_cast<double>(tr.x);
const double y2 = static_cast<double>(tr.y);
fl_arc(x2, y2, radius, start_deg, end_deg);
const double x3 = static_cast<double>(br.x);
const double y3 = static_cast<double>(br.y);
fl_arc(x3, y3, radius, start_deg, end_deg);
const double x4 = static_cast<double>(bl.x);
const double y4 = static_cast<double>(bl.y);
fl_arc(x4, y4, radius, start_deg, end_deg);}
I know this also has something from FLTK, but because it involves an error message given by the Local Windows Debugger in Visual Studio, I thought I'd ask here. I hope someone on here is able to help me out. Thanks in advance.
