cannot connect (null)

Lorence

I have an array of type Tile which inherits QLabel

std::array<PlayableTile*,2>tile
{ {
ui->playableTile1,
ui->playableTile2
} };
Error: cannot connect (null)::pushTile() to MainWindow::pushTile()

connect(tile[0],SIGNAL(pushTile()),this,SLOT(pushTile());
....................^ this is where the error come froms

But when I do

connect(ui->playableTile1,SIGNAL(pushTile()),this,SLOT(pushTile());
I'm not getting any erorr

JKSH

@Lorence said:

std::array<PlayableTile*,2>tile
{ {
ui->playableTile1;
ui->playableTile2;
}. };

That looks like a typo. What's your actual code?

Lorence

Sorry for the late reply and yes it's a typo sorry, I'm just typing on my phone because my PC has a problem on connection

Its an array, the first semicolon is a comma and forget the second one, I edited it

JKSH

What do you get when you call this?:

#include <QDebug>

// ...

qDebug() << tile[0];

Lorence

Sorry again for the late reply, i was so busy but now im free

What do you get when you call this?:
This is what i get
QObject(0x0)

JKSH

@Lorence said:

Sorry again for the late reply, i was so busy but now im free

That's OK :)

This is what i get
QObject(0x0)

You have a null pointer.

Lorence

I fixed it by doing this

std::array<PlayableTile*,5> playableTileArray;

playableTileArray[0] = ui->playableTile1;
playableTileArray[1] = ui->playableTile2;
playableTileArray[2] = ui->playableTile3;
playableTileArray[3] = ui->playableTile4;
playableTileArray[4] = ui->playableTile5;

C++ is now kicking me just because i havent programmed for 2 weeks.
can you explain to me why this works?

You have a null pointer.
I dont get it, why i have a null pointer?

mrjj

Hi
well if you do

std::array<PlayableTile*,2>tile
{ {
ui->playableTile1;
ui->playableTile2;
}. };

in Class def. (the h file)
then its very likely that this list is init'ed up BEFORE the
ui->setupUi ( this );
in the constructor so you are adding NULL pointers.
So it's best to add them explicit and not use init lists to be on the safe side.
So before ui->setupUi ( this ); Nothing is setup yet.
You second example works as you do not use init list anymore so I bet
playableTileArray[0] = ui->playableTile1;
is after ui->setupUi ( this );

[edit: fixed coding tags SGaist]