digitalmars.D.learn - Passing Variables between classes in modules
- okibi <okibi ratedo.com> Apr 26 2007
- Johan Granberg <lijat.meREM OVEgmail.com> Apr 26 2007
- okibi <okibi ratedo.com> Apr 26 2007
- okibi <okibi ratedo.com> Apr 26 2007
- Johan Granberg <lijat.meREM OVEgmail.com> Apr 26 2007
- okibi <okibi ratedo.com> Apr 26 2007
- Johan Granberg <lijat.meREM OVEgmail.com> Apr 26 2007
- okibi <okibi ratedo.com> Apr 26 2007
- Mike Parker <aldacron71 yahoo.com> Apr 26 2007
- okibi <okibi ratedo.com> Apr 26 2007
- Ary Manzana <ary esperanto.org.ar> Apr 26 2007
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
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
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
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
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
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
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
okibi <okibi ratedo.com> 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
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
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
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