Error while calling other class.

[Meera Hadid]

• I am getting an error when I am trying to call another class(ImportDICOMBrowser) in qSlicerMainWindow through on_LoadAction_triggered action.

#include "importdicombrowser.h"

void qSlicerMainWindow::on_LoadAction_triggered()
{
  ImportDICOMBrowser* temp = new ImportDICOMBrowser(this);
  temp->show();
}

• ImportDICOMBrowser.h

#ifndef IMPORTDICOMBROWSER_H
#define IMPORTDICOMBROWSER_H

#include <QDialog>

namespace Ui {
class ImportDICOMBrowser;
}

class ImportDICOMBrowser : public QDialog
{
    Q_OBJECT

public:
    explicit ImportDICOMBrowser(QWidget *parent = nullptr);
    ~ImportDICOMBrowser();

private:
    Ui::ImportDICOMBrowser *ui;
};

#endif // IMPORTDICOMBROWSER_H

• ImportDICOMBrowser.cxx

#include "importdicombrowser.h"
#include "ui_importdicombrowser.h"

ImportDICOMBrowser::ImportDICOMBrowser(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::ImportDICOMBrowser)
{
    ui->setupUi(this);
}

ImportDICOMBrowser::~ImportDICOMBrowser()
{
    delete ui;
}

• ERROR:

Error	LNK2019	unresolved external symbol "public: __cdecl ImportDICOMBrowser::ImportDICOMBrowser(class QWidget *)" (??0ImportDICOMBrowser@@QEAA@PEAVQWidget@@@Z) referenced in function "public: void __cdecl qSlicerMainWindow::on_LoadAction_triggered(void)" (?on_LoadAction_triggered@qSlicerMainWindow@@QEAAXXZ) 

• I am not able to understand why is it showing ImportDICOMBrowser as an external variable, I also included the hearder file #include "importdicombrowser.h"

[Christian Ehrlicher]

@Meera-Hadid said in Error while calling other class.:

ImportDICOMBrowser.cxx

Do you actually compile this source when building your application?

[Meera Hadid]

@Christian-Ehrlicher I didn't understand your question, can you please elaborate.

[JonB]

@Meera-Hadid
@Christian-Ehrlicher is asking you when and how ImportDICOMBrowser.cxx gets compiled during your build process? For qSlicerMainWindow to call anything about class ImportDICOMBrowser that will need compiling and linking with your qSlicerMainWindow stuff.