QThread and Error Access violation

[SGaist]

Hi,

Are you trying to call MainWindow::_send directly from MyThread::run ?

[A Former User]

[quote author="SGaist" date="1407411703"]Hi,

Are you trying to call MainWindow::_send directly from MyThread::run ?[/quote]

hi SGaist how are you ?
Thanks for your reply..

By MainWindow::_send(); i get this error :

@

error: cannot call member function 'void MainWindow::_send()' without object
MainWindow::_send();
^
@

[SGaist]

You can't call a function from another class.

Also, you have a signature mismatch between your header and implementation.

What exactly are you trying to achieve ?

[A Former User]

[quote author="SGaist" date="1407412316"]You can't call a function from another class.

Also, you have a signature mismatch between your header and implementation.

What exactly are you trying to achieve ?
[/quote]

Where is my mismatch can u show me?
I want to change my tabWidget status from disable to enable after Thread processing...

[SGaist]

@
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public:
void _send(QString _title, QString _message); << here
}; @

@
void MyThread::run()
{
//Run my function
_send(); << there
}
@

[A Former User]

[quote author="SGaist" date="1407442699"]@
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public:
void _send(QString _title, QString _message); << here
}; @

@
void MyThread::run()
{
//Run my function
_send(); << there
}
@

[/quote]

Hi again...

I Chaged to

@
public:
void _send();
@

and

@
void MainWindow::_send()

{

ui->tabWidget->setDisabled(false);

};
@

and

@
void MyThread::run()
{
//Run my function
//MainWindow::_send();

MainWindow *II;
    II->_send();

}
@

but not working !
Error :

@
QObject::connect: No such slot MainWindow::_send() in ..\untitled15\mainwindow.cpp:40
QObject::connect: (receiver name: 'MainWindow')
@

[A Former User]

try to change "public" into "public slots" before your send function.

[A Former User]

[quote author="msue" date="1407481533"]try to change "public" into "public slots" before your send function.[/quote]

Unfortunately ...
The program has unexpectedly finished.
..\untitled15.exe crashed

:(

[SGaist]

That's normal, MainWindow *ll is uninitialized.

Anyway, you should not access MainWindow from your thread, just emit the signal you connected earlier.

Also it's seems you are new to C++, I'd recommend getting a good book about it

[A Former User]

[quote author="SGaist" date="1407483129"]That's normal, MainWindow *ll is uninitialized.

Anyway, you should not access MainWindow from your thread, just emit the signal you connected earlier.

Also it's seems you are new to C++, I'd recommend getting a good book about it[/quote]

Can you show me a good document or book about this question ?!
I mean how to update GUI in Thread process.

Thank you.

[SGaist]

Qt's own documentation and examples e.g. the Mandelbrot example

[A Former User]

[quote author="SGaist" date="1407484062"]Qt's own documentation and examples e.g. the Mandelbrot example[/quote]

Thank you for your helping... i try to read it :)