LNK 2019 Error

meikelneit

Hello again, i have a Problem with one of my classes. When i try to compile i get the LNK2019 Error and i cant find the casue.

my class Looks like:
#ifndef DATABLOCKLOADER_H
#define DATABLOCKLOADER_H

#include <QFile>
#include <QTreeView>
#include "TreeModel.h"
#include "ProjectObjects/TreeItem.h"

class DataBlockLoader
{
public:
DataBlockLoader(QTreeView *p_treeView, TreeItem *p_item, TreeModel *p_model);

void load(QFile *p_file);
void ArrayAnlegen(QFile *p_file, QString p_ZeilenInhalt, int p_tiefe);
void StructAnlegen(QFile *p_file, QString p_ZeilenInhalt, int p_tiefe);
void UDTAnlegen(QString p_filePath, QString p_ZeilenInhalt, int p_Tiefe);

private:

QTreeView *m_treeView;
TreeModel *m_model;
TreeItem *m_parentPointer[99];
QRegularExpression *m_Datentypen;

};

#endif // DATABLOCKLOADER_H

I include it in another calss with:
#include "ProjectObjects/Devices/Siemens/CPU_S71500/DataBlockLoader.h"

and then create an object of it with:
DataBlockLoader *Import = new DataBlockLoader(m_treeView, m_Item, m_model);

and that is the line causing the error. Someone got an idea? Or you Need more Information of surrounding Code?

complete Error is here:
DataBlockView_S71500new.obj:-1: Fehler: LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""public: __thiscall DataBlockLoader::DataBlockLoader(class QTreeView *,class TreeItem *,class TreeModel *)" (??0DataBlockLoader@@QAE@PAVQTreeView@@PAVTreeItem@@PAVTreeModel@@@Z)" in Funktion ""private: void __thiscall DataBlockView_S71500new::sl_import(void)" (?sl_import@DataBlockView_S71500new@@AAEXXZ)".

PS:
The constructo was missing:
DataBlockLoader::DataBlockLoader(QTreeView *p_treeView, TreeItem *p_item, TreeModel *p_model)
{
m_treeView = p_treeView;
m_model = p_model;

m_Datentypen = new QRegularExpression;
m_Datentypen->setPattern(("(Array|Bool|Byte|Char|Int|String|Struct)"));

m_parentPointer[1] = p_item;

}

meikelneit

No i said that i little bit unclear, i just meant as information for you the constructor was missing. But it is solved now. I had to delete the QT and c++ build folder, then i just cleaned, run Remake and rebuild, then it worked. My experience now says, that LNK error is not a syntax problem in 99% of all cases .

"solved"

raven-worx

@meikelneit
did you already do the following?

clean
rerun qmake
rebuild

If yes or that doesn't solve your issue are you sure that the cpp file implementing the type is added to your .pro file?

meikelneit

yeah i did that before.
clean
run Remake
rebuild

how can i proof if the pro file has that cpp implemented?

meikelneit

Ok i found out, but it is inside the .pro
ProjectObjects/Devices/Siemens/CPU_S71500/DataBlockLoader.cpp and .h

jsulm

@meikelneit said in LNK 2019 Error:

The constructo was missing:

So, is it solved now?

meikelneit

No i said that i little bit unclear, i just meant as information for you the constructor was missing. But it is solved now. I had to delete the QT and c++ build folder, then i just cleaned, run Remake and rebuild, then it worked. My experience now says, that LNK error is not a syntax problem in 99% of all cases .

"solved"