send reference qplaintextedit to C++ constructor class - c++

Question

I need to send reference a QPlainTextEdit to my C++ class Analizador for add lines to QPlainTextEdit from my class. I add the include <QPlainTextEdit> to the class, create the QPlainTextEdit from the graphic interface and call the constructor function just like that
Analizador *anal=new Analizador(ui->textProgres);
the constructor function is:
Analizador(QPlainTextEdit* text);
the compiler throw the error :
mainwindow.cpp:23: error: undefined reference to
`Analizador::Analizador(QPlainTextEdit*)'
so I guess the error is because I'm not sending a pointer to the constructor function but I don't know how to access the pointers of QPlainTextEdit
PS. I'm new in Qt and C++

Answer 1

In this case, compiler complains that it cannot find the definition of Analizador constructor when it tries to link your application.
Make sure you have written the definition of Analizador::Analizador(QPlainTextEdit*) constructor.
If you have written the constructor but still you gets this issue, The cpp file where your constructor exists may not have got compiled. If you are using QtCreator, try Build -> Run QMake and then Build -> Rebuild All

Answer 2

You can try this workaround.
#ifndef ANALIZADOR_H
#define ANALIZADOR_H
#include <QPlainTextEdit>
class Analizador
{
public:
Analizador(QPlainTextEdit *text)
{
plainTextEdit = text;
}
void addLines(QString line)
{
plainTextEdit->appendPlainText(line);
}
private:
QPlainTextEdit *plainTextEdit;
};
#endif // ANALIZADOR_H
And use this class like this.
analizador = new Analizador(ui->plainTextEdit);
analizador->addLines("Hello");
analizador->addLines("World");