How to display an additional window with a gtk C query?

Question

I would like a window to appear when I start a program in C using GTK+ 3.0, asking for a number to be entered, once entered this window closes and the main window opens, where the actual program takes place using the parameter specified by the user. I have no idea how to do this, I would appreciate any help.

int main( int argc,char *argv[] ){
gtk_init(&argc,&argv);
GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window),"Sudoku");
gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER);
gtk_container_set_border_width(GTK_CONTAINER(window),8);
g_signal_connect(G_OBJECT(window),"destroy",G_CALLBACK(gtk_main_quit),NULL);
GtkWidget *box1=gtk_box_new(GTK_ORIENTATION_HORIZONTAL,0);
gtk_container_add(GTK_CONTAINER(window),box1);
CreateBoard(box1);            //my function                          
CreateControl(box1);          //my function                           
gtk_widget_show_all(window);
srand(time(NULL));
StartGame();                  //my function                                                         
gtk_main();
return 0;
}

Above is my main function, I create the main window in it. Using which functions from GTK can I create another window which is displayed before the main one?

Answer 1

Try to first convert the query into a fixed length char array[1024], then make another char array (signed or unsigned, it doesn't matter).

Use the strlen() defined in <stdlib.h> function to find the length of the array, which you can then use to output as a short.

Assign each short to a particular char array, and since each array is of a different length, that is essentially an identifier for that char array, which you can just call upon during the runtime. That should make it easier to query the variables.