Cannot pass variable to another Dialog

[t0msk]

But now I have an error:

error: no match for 'operator=' (operand types are 'Store' and 'Store****')
     ***store = &store_init;
              ^

code:

void MainWindow::setData(QSqlDatabase db_init, Store ***store_init)
{
    //db = db_init;
    ***store = store_init;
}

[SGaist]

You are dereferencing your pointer three time, that's why it complains.

Out of curiosity, what do you have in that three-dimensional table ?

[mpergand]

I think you need a pointer, for example:

char s[5][2];
char (*s2)[2]=s;  // pointer to array of two chars

Passing an array to a function is the same as passing a pointer to the first dimension:

void myFunct(char s[5][2])
// is the same as:
void myFunct(char (*s)[2])
// more simply, you can omit the size of the first dimension:
void myFunct(char s[][2])

[t0msk]

@SGaist said in Cannot pass variable to another Dialog:

You are dereferencing your pointer three time, that's why it complains.

Out of curiosity, what do you have in that three-dimensional table ?

Three-dimensional array represents a 3D space in store.

My code:

Store store[5][5][10];
void MainWindow::setData(Store store_init[][5][10])
{
    store = store_init;
}

error: incompatible types in assignment of 'Store (*)[5][10]' to 'Store [5][5][10]'
     store = store_init;
           ^

Maybe I will set data using three nested loops :D

[jsulm]

@t0msk You cannot do it like this. C/C++ will not copy the content of the array if you assign it to another array. Arrays are basically pointers in C/C++. And [5][5][10] is not the same as [][5][10] (here the first dimension is not specified)!
You should take a look at std::array.

[t0msk]

I dont know how to copy content of whole array to another using 1 line, I solved it by loops:

int i, j, k;

for(i = 0;i < 5;i++) {
    for(j = 0;j < 5;j++) {
        for(k = 0;k < 10;k++) {
            store[i][j][k] = store_init[i][j][k];
        }
    }
}

[t0msk]

One more question.

Calling window:

int test = 7;

Dialog *window = new Dialog();
window->setAttribute(Qt::WA_DeleteOnClose);
window->setData(test);
window->show();

Dialog.h

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
    void setData(int test);

Dialog.cpp

int second;

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

    ui->label->setText(QString::number(second));
}

void Dialog::setData(int test) {

    second = test;
}

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

Problem is that value in ui->label is 0 and not 7, why? :/

[SGaist]

Because it's test that is 7 and second is not initialised so it's pure luck that it's 0.

[t0msk]

And how to initialise "second"?

[SGaist]

Assign it a value in the constructor initializer list.

[mpergand]

void Dialog::setData(int test) {
  second = test;
 ui->label->setText(QString::number(second));
}

In the constructor, you can set the default value ( 0 ?)

[jsulm]

@t0msk You could use the C function memcpy() - it is much more efficient compared to your solution and is only one line :-)