I don't get expected output in text browser

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There is a problem in the program

in mainwindow.h

class input_events //: public MainWindow 
{
        typedef struct input ie;
 
        public:
                ie *l;
                ~input_events();
                input_events();
                void add_ie(ie *p);
 };

class input_events //: public MainWindow 
{
        typedef struct input ie;

        public:
                ie *l;
                ~input_events();
                input_events();
                void add_ie(ie *p);
 };

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in mainwindow.cpp

struct input
{
        int id;
            struct input * suiv;
};
typedef struct input ie;

struct input
{
        int id;
            struct input * suiv;
};
typedef struct input ie;

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And also

void MainWindow::print()
{
    input_events * ptr_ie;
    ie * ine;
 
   QString resultString = "";
   for(ine=ptr_ie->l; ine; ine = ine->suiv)
   {
        ui->textBrowser->setText(ui->textBrowser->toPlainText() + resultString.setNum(ine->id) + " ");
    }
}

void MainWindow::print()
{
    input_events * ptr_ie;
    ie * ine;

   QString resultString = "";
   for(ine=ptr_ie->l; ine; ine = ine->suiv)
   {
        ui->textBrowser->setText(ui->textBrowser->toPlainText() + resultString.setNum(ine->id) + " ");
    }
}

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The problem is that does not print output in function print()

the program here <link to 3rd party site removed, use attachments instead>

Thank you for your time