sharing static variable between functions

Chandras002

I'm trying to use a static variable so I can call it and use it 2 different functions on the same file.

//
#ifndef TESTNET_C_H
#define TESTNET_C_H

#include <QMainWindow>
#include <QtNetwork>
#include <stdlib.h>

namespace Ui {
class Testnet_c;
}

class Testnet_c : public QMainWindow
{
    Q_OBJECT

public:
  static QString strImageFilenameDir;
    explicit Testnet_c(QWidget *parent = 0);
    ~Testnet_c();

private slots:

   clicked();

private:
    Ui::Testnet_c *ui;
    QTcpSocket * tcpSocket;
  };

#endif // TESTNET_C

On the Testnet_c. cpp file, i am trying to use

void Testnet_c::on_pushButton_3_clicked()    
{
   QString exefileName;

 QString Testnet_c::strImageFilenameDir;  '
 // QString strImageFilenameDir;
QString Testnet_c::strImageFilenameDir;
strImageFilenameDir=txtfilenameinfo.absolutePath();

}

void Testnet_c::on_pushButton_4_clicked()    
{

 strImageFilenameDir = "Some path name"
}

On Testnet_c button.cpp strImageFilenameDir get path on the pushButton_3 , it should be used on another function in the same file.
Now, i'm getting error
qualified-id in declaration before ';' token

If did not declare the variable on header file, use it only in the .cpp file as static, getting the correct value for first function pushButton_3 and get " " for the pushButton _4 .
i.e it does not retain value of the path (which it got on the earlier function)

Am i missing something? Thanks a lot..

Cheers!
chandra

jsulm

@Chandras002 said in sharing static variable between functions:

QString Testnet_c::strImageFilenameDir;

Move this to Testnet_c. cpp file. You do NOT define static variables inside functions!

QString Testnet_c::strImageFilenameDir;

void Testnet_c::on_pushButton_3_clicked()    
{
...
}

See https://www.tutorialspoint.com/cplusplus/cpp_static_members.htm

Chandras002

yes. it works. Thanks a lot. It made my Day :)

similar to my problem here to discussed,. Just for someone's reference
https://stackoverflow.com/questions/22566322/undefined-reference-to-statically-declared-variable-in-qt

Cheers!
chandra