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digitalmars.D.learn - Passing Variables between classes in modules

reply okibi <okibi ratedo.com> writes:
I was wondering how I would go about passing a variable between two classes
that are within different modules in a program. Here is an example of what I
mean:

Let this be modMain:

//begin modMain

module modMain;

//imports go here

import modPopUp;

class modMain : MainWindow //this is for gtkD
{
  //this() would build the MainWindow
  
  modPopOp popWindow = new modPopUp();
}

void main(char[][] args)
{
  GtkD.init(args);
  modMain mMain = new modMain();
  GtkD.main();
}

//end modMain

Now let this be modPopUp:

//begin modPopUp

module modPopUp:

//imports go here

class modPopUp : MainWindow
{
  //this() would build the MainWindow
  
  char[] myStr;
  //function runs to generate myStr
}

//end modPopUp

What I'm asking is how do I pass myStr from modPopUp back to modMain?

Thanks!
Apr 26 2007
parent reply Johan Granberg <lijat.meREM OVEgmail.com> writes:
okibi wrote:

 I was wondering how I would go about passing a variable between two
 classes that are within different modules in a program. Here is an example
 of what I mean:
 
 Let this be modMain:
 
 //begin modMain
 
 module modMain;
 
 //imports go here
 
 import modPopUp;
 
 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }
 
 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }
 
 //end modMain
 
 Now let this be modPopUp:
 
 //begin modPopUp
 
 module modPopUp:
 
 //imports go here
 
 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }
 
 //end modPopUp
 
 What I'm asking is how do I pass myStr from modPopUp back to modMain?
 
 Thanks!

Would popWindow.myStr work or have I misunderstood your question?
Apr 26 2007
parent reply okibi <okibi ratedo.com> writes:
Johan Granberg Wrote:

 okibi wrote:
 
 I was wondering how I would go about passing a variable between two
 classes that are within different modules in a program. Here is an example
 of what I mean:
 
 Let this be modMain:
 
 //begin modMain
 
 module modMain;
 
 //imports go here
 
 import modPopUp;
 
 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }
 
 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }
 
 //end modMain
 
 Now let this be modPopUp:
 
 //begin modPopUp
 
 module modPopUp:
 
 //imports go here
 
 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }
 
 //end modPopUp
 
 What I'm asking is how do I pass myStr from modPopUp back to modMain?
 
 Thanks!

Would popWindow.myStr work or have I misunderstood your question?

It doesn't throw an error, however it grabs a null value instead of what the function sets the variable to.
Apr 26 2007
parent reply okibi <okibi ratedo.com> writes:
okibi Wrote:

 Johan Granberg Wrote:
 
 okibi wrote:
 
 I was wondering how I would go about passing a variable between two
 classes that are within different modules in a program. Here is an example
 of what I mean:
 
 Let this be modMain:
 
 //begin modMain
 
 module modMain;
 
 //imports go here
 
 import modPopUp;
 
 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }
 
 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }
 
 //end modMain
 
 Now let this be modPopUp:
 
 //begin modPopUp
 
 module modPopUp:
 
 //imports go here
 
 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }
 
 //end modPopUp
 
 What I'm asking is how do I pass myStr from modPopUp back to modMain?
 
 Thanks!

Would popWindow.myStr work or have I misunderstood your question?

It doesn't throw an error, however it grabs a null value instead of what the function sets the variable to.

Now if I reference the variable right after creating the instance of modPopUp, it will go ahead and try to grab the value without waiting to the instance to run the function to set it. I bet that's why it's grabbing a null value. Is there another method to pass the variable, or is there a way to lock modMain until modPopUp returns?
Apr 26 2007
parent reply Johan Granberg <lijat.meREM OVEgmail.com> writes:
okibi wrote:

 okibi Wrote:
 
 Johan Granberg Wrote:
 
 okibi wrote:
 
 I was wondering how I would go about passing a variable between two
 classes that are within different modules in a program. Here is an
 example of what I mean:
 
 Let this be modMain:
 
 //begin modMain
 
 module modMain;
 
 //imports go here
 
 import modPopUp;
 
 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }
 
 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }
 
 //end modMain
 
 Now let this be modPopUp:
 
 //begin modPopUp
 
 module modPopUp:
 
 //imports go here
 
 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }
 
 //end modPopUp
 
 What I'm asking is how do I pass myStr from modPopUp back to modMain?
 
 Thanks!

Would popWindow.myStr work or have I misunderstood your question?

It doesn't throw an error, however it grabs a null value instead of what the function sets the variable to.

Now if I reference the variable right after creating the instance of modPopUp, it will go ahead and try to grab the value without waiting to the instance to run the function to set it. I bet that's why it's grabbing a null value. Is there another method to pass the variable, or is there a way to lock modMain until modPopUp returns?

I can't determin that from the code above, it would be useful to know what calls the function that sets myStr. If it is called from the constructor my earlier suggestion would work, but if it is called by some other thread something more is required. If as I suspect from your comments myStr is set from another thread you should be able to acquire a lock in the constructor and then release it in the function that sets myStr. hope this helps you.
Apr 26 2007
parent reply okibi <okibi ratedo.com> writes:
Johan Granberg Wrote:

 okibi wrote:
 
 okibi Wrote:
 
 Johan Granberg Wrote:
 
 okibi wrote:
 
 I was wondering how I would go about passing a variable between two
 classes that are within different modules in a program. Here is an
 example of what I mean:
 
 Let this be modMain:
 
 //begin modMain
 
 module modMain;
 
 //imports go here
 
 import modPopUp;
 
 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }
 
 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }
 
 //end modMain
 
 Now let this be modPopUp:
 
 //begin modPopUp
 
 module modPopUp:
 
 //imports go here
 
 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }
 
 //end modPopUp
 
 What I'm asking is how do I pass myStr from modPopUp back to modMain?
 
 Thanks!

Would popWindow.myStr work or have I misunderstood your question?

It doesn't throw an error, however it grabs a null value instead of what the function sets the variable to.

Now if I reference the variable right after creating the instance of modPopUp, it will go ahead and try to grab the value without waiting to the instance to run the function to set it. I bet that's why it's grabbing a null value. Is there another method to pass the variable, or is there a way to lock modMain until modPopUp returns?

I can't determin that from the code above, it would be useful to know what calls the function that sets myStr. If it is called from the constructor my earlier suggestion would work, but if it is called by some other thread something more is required. If as I suspect from your comments myStr is set from another thread you should be able to acquire a lock in the constructor and then release it in the function that sets myStr. hope this helps you.

Well, I know the value is coming up null as it doesn't wait for the instance of modPopUp to finish, and is there not getting the data. How would I go about locking modMain until modPopUp is finished?
Apr 26 2007
next sibling parent reply Johan Granberg <lijat.meREM OVEgmail.com> writes:
okibi wrote:

 Johan Granberg Wrote:
 
 okibi wrote:
 
 okibi Wrote:
 
 Johan Granberg Wrote:
 
 okibi wrote:
 
 I was wondering how I would go about passing a variable between
 two classes that are within different modules in a program. Here
 is an example of what I mean:
 
 Let this be modMain:
 
 //begin modMain
 
 module modMain;
 
 //imports go here
 
 import modPopUp;
 
 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }
 
 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }
 
 //end modMain
 
 Now let this be modPopUp:
 
 //begin modPopUp
 
 module modPopUp:
 
 //imports go here
 
 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }
 
 //end modPopUp
 
 What I'm asking is how do I pass myStr from modPopUp back to
 modMain?
 
 Thanks!

Would popWindow.myStr work or have I misunderstood your question?

It doesn't throw an error, however it grabs a null value instead of what the function sets the variable to.

Now if I reference the variable right after creating the instance of modPopUp, it will go ahead and try to grab the value without waiting to the instance to run the function to set it. I bet that's why it's grabbing a null value. Is there another method to pass the variable, or is there a way to lock modMain until modPopUp returns?

I can't determin that from the code above, it would be useful to know what calls the function that sets myStr. If it is called from the constructor my earlier suggestion would work, but if it is called by some other thread something more is required. If as I suspect from your comments myStr is set from another thread you should be able to acquire a lock in the constructor and then release it in the function that sets myStr. hope this helps you.

Well, I know the value is coming up null as it doesn't wait for the instance of modPopUp to finish, and is there not getting the data. How would I go about locking modMain until modPopUp is finished?

I can't really tell without seeing more code, the most important information is where the function that creates myStr is called from followed by the functions that creates myStr itself.
Apr 26 2007
parent okibi <okibi ratedo.com> writes:
Johan Granberg Wrote:

 okibi wrote:
 
 Johan Granberg Wrote:
 
 okibi wrote:
 
 okibi Wrote:
 
 Johan Granberg Wrote:
 
 okibi wrote:
 
 I was wondering how I would go about passing a variable between
 two classes that are within different modules in a program. Here
 is an example of what I mean:
 
 Let this be modMain:
 
 //begin modMain
 
 module modMain;
 
 //imports go here
 
 import modPopUp;
 
 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }
 
 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }
 
 //end modMain
 
 Now let this be modPopUp:
 
 //begin modPopUp
 
 module modPopUp:
 
 //imports go here
 
 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }
 
 //end modPopUp
 
 What I'm asking is how do I pass myStr from modPopUp back to
 modMain?
 
 Thanks!

Would popWindow.myStr work or have I misunderstood your question?

It doesn't throw an error, however it grabs a null value instead of what the function sets the variable to.

Now if I reference the variable right after creating the instance of modPopUp, it will go ahead and try to grab the value without waiting to the instance to run the function to set it. I bet that's why it's grabbing a null value. Is there another method to pass the variable, or is there a way to lock modMain until modPopUp returns?

I can't determin that from the code above, it would be useful to know what calls the function that sets myStr. If it is called from the constructor my earlier suggestion would work, but if it is called by some other thread something more is required. If as I suspect from your comments myStr is set from another thread you should be able to acquire a lock in the constructor and then release it in the function that sets myStr. hope this helps you.

Well, I know the value is coming up null as it doesn't wait for the instance of modPopUp to finish, and is there not getting the data. How would I go about locking modMain until modPopUp is finished?

I can't really tell without seeing more code, the most important information is where the function that creates myStr is called from followed by the functions that creates myStr itself.

It really is that simple of code though. The "function" is as follows, however: void setmyStr(Button Button) { myStr = test text"; } This function responds to a button press on the window created in this().
Apr 26 2007
prev sibling next sibling parent reply Mike Parker <aldacron71 yahoo.com> writes:
okibi wrote:

 
 Well, I know the value is coming up null as it doesn't wait for the instance
of modPopUp to finish, and is there not getting the data. How would I go about
locking modMain until modPopUp is finished?

Either I'm misunderstanding you, or you are misunderstanding the code. When you say 'it doesn't wait for the instance of myPopUp to finish', what do you mean? When you create an object instance, the constructor for that object is called. When the constructor returns, the object has been created. No other methods on that object are executed. Any initialization that needs to be done, such as that of myStr, should take place in the constructor. If you do not initialize myStr in the constructor, then of course it will be null when you try to access it.
Apr 26 2007
parent okibi <okibi ratedo.com> writes:
Mike Parker Wrote:

 okibi wrote:
 
 
 Well, I know the value is coming up null as it doesn't wait for the instance
of modPopUp to finish, and is there not getting the data. How would I go about
locking modMain until modPopUp is finished?

Either I'm misunderstanding you, or you are misunderstanding the code. When you say 'it doesn't wait for the instance of myPopUp to finish', what do you mean? When you create an object instance, the constructor for that object is called. When the constructor returns, the object has been created. No other methods on that object are executed. Any initialization that needs to be done, such as that of myStr, should take place in the constructor. If you do not initialize myStr in the constructor, then of course it will be null when you try to access it.

So how do I get a variable from the object after the constructor returns?
Apr 26 2007
prev sibling parent Ary Manzana <ary esperanto.org.ar> writes:
okibi escribió:
 Johan Granberg Wrote:
 
 okibi wrote:

 okibi Wrote:

 Johan Granberg Wrote:

 okibi wrote:

 I was wondering how I would go about passing a variable between two
 classes that are within different modules in a program. Here is an
 example of what I mean:

 Let this be modMain:

 //begin modMain

 module modMain;

 //imports go here

 import modPopUp;

 class modMain : MainWindow //this is for gtkD
 {
   //this() would build the MainWindow
   
   modPopOp popWindow = new modPopUp();
 }

 void main(char[][] args)
 {
   GtkD.init(args);
   modMain mMain = new modMain();
   GtkD.main();
 }

 //end modMain

 Now let this be modPopUp:

 //begin modPopUp

 module modPopUp:

 //imports go here

 class modPopUp : MainWindow
 {
   //this() would build the MainWindow
   
   char[] myStr;
   //function runs to generate myStr
 }

 //end modPopUp

 What I'm asking is how do I pass myStr from modPopUp back to modMain?

 Thanks!


the function sets the variable to.

modPopUp, it will go ahead and try to grab the value without waiting to the instance to run the function to set it. I bet that's why it's grabbing a null value. Is there another method to pass the variable, or is there a way to lock modMain until modPopUp returns?

calls the function that sets myStr. If it is called from the constructor my earlier suggestion would work, but if it is called by some other thread something more is required. If as I suspect from your comments myStr is set from another thread you should be able to acquire a lock in the constructor and then release it in the function that sets myStr. hope this helps you.

Well, I know the value is coming up null as it doesn't wait for the instance of modPopUp to finish, and is there not getting the data. How would I go about locking modMain until modPopUp is finished?

It would be much more simpler if you'd tell us your problem instead of how to accomplish your particular solution to the problem. Instead of saying "after modPopUp finishes", say "When I press the button, a text is assigned to myStr. Then I want to do something in modMain". If you want to do the above, the best way is with the observer pattern. http://en.wikipedia.org/wiki/Observer_pattern
Apr 26 2007