Android Question Would appreciate help to know why global variables ae not global

[aedwall]

Attached is a test project in which the global variables I define in "Class_Globals" or "Process_Globals" are not being recognized as global variables. If I do not set the same definitions in both "B4XMainPage.bas" and "Module1.bas", then I cannot compile the project because it tells me various variables have not yet been defined. In my world, I thought you could define your global variables in one place, then everything in the project knows what the global variables are. But not here. It makes no sense to me. If anyone can help, I would appreciate your comments. The final output desired is the display (among other things) of the position of Saturn as ~162.1072, but the "Display_output_data_2a" routine is not treating cs1 as a global and therefore does not return its value to the calling routine in "B4XMainPage.bas".

The project requires the "SE_v201" library files, which are attached.

Thank you for your help.

 

[Cableguy]

I just took a look at your code... I think you are confusing "Main" with "B4XMainPage"
Main is an activity module, and in B4XPages, the only activity
B4XMainPage is a Special Class Module that solves a few problems related to multi activity projects
So, B4XMainPage does NOT have a "Process Globals" sub, on the Activity "Main" does
so you should start by firstly understand what that means!
Also, using 10+ years old libs, when more recent and versatile options exist, like in your case the "Dialogs" and "ClipBoard" libs, is something I recomend you to avoid.
I for one, will not add such libs to my additional libs folder

 

[Cableguy]

This will also make for interesting reading:

Android Process and activities life cycle

New video tutorial: Lets start simple: Each B4A program runs in its own process. A process has one main thread which is also named the UI thread which lives as long as the process lives. A process can also have more threads which are useful for background tasks. A process starts when the...

www.b4x.com

[B4X] B4XPages - Cross platform and simple framework for managing multiple pages

B4XPages is a library that serves two purposes: 1. Make it simple to develop B4A apps by solving almost all of the challenges involved with Android complex activities life cycle. B4XPages makes B4A behave more similar to B4J and B4i where the new "B4XPage" element is a regular object that is...

www.b4x.com

so you can understand the major differences

 

[Cableguy]

and to finish, I CAN acces Module1 's variables! This screenshot is from B4XMainPage

 

[aedwall]

I just took a look at your code... I think you are confusing "Main" with "B4XMainPage"
Main is an activity module, and in B4XPages, the only activity
B4XMainPage is a Special Class Module that solves a few problems related to multi activity projects
So, B4XMainPage does NOT have a "Process Globals" sub, on the Activity "Main" does
so you should start by firstly understand what that means!
Also, using 10+ years old libs, when more recent and versatile options exist, like in your case the "Dialogs" and "ClipBoard" libs, is something I recomend you to avoid.
I for one, will not add such libs to my additional libs folder

Makes no difference if I move the globals to "Main". "Sub Process_Globals". Then it doesn't compile.

Error parsing program.
Error description: Undeclared variable 'vrs' is used before it was assigned any value.
Error occurred on line: 75 (B4XMainPage)
t = vrs & " - " & month_names(9) & " " & NumberFormat(22, 2, 0) & " " & "1949" & " at " & "16" & ":" & NumberFormat(43, 2, 1) & " TZ =" & NumberFormat2(0, 1, 1, 1, False) & CRLF

Nor does the attached work properly either.

I appreciate the fact that I do not fully understand all the terminology. I appreciate your suggestions, but I'm not sure I understand exactly what to do as the fix. Yes, I know that old libraries may be an issue at times. But it is not my current issue. And the old stuff does work. What doesn't work are the global variables - b4X just doesn't recognize them as global variables. And until I get that fixed, then I have nothing.

 

[Cableguy]

Test2 compiles just fine!!!

 

[aedwall]

and to finish, I CAN acces Module1 's variables! This screenshot is from B4XMainPage

View attachment 163994

But do they have any value? When I look at them, yes the variables are there, but their values are blank. Why? I set them, but in another module, they lose their original values and I see either blanks for strings or "0.0" for array values.

 

[aedwall]

Test2 compiles just fine!!!

View attachment 163998

But did you get an actual planet name in the message box when you ran it? I get a blank for a planet name. Because the program is not remembering what the global variable's value is.

 

[Cableguy]

wow!!!!! of course they are empty! You declare p_names in Main, and then AGAIN in sub_routines module... by doing that, you null them!
give me a few minutes!

 

[aedwall]

wow!!!!! of course they are empty! You declare p_names in Main, and then AGAIN in sub_routines module... by doing that, you null them!
give me a few minutes!

But if I don't declare them in both places, then the project does not compile. Try it on your end. Comment one out and see.

 

[aedwall]

wow!!!!! of course they are empty! You declare p_names in Main, and then AGAIN in sub_routines module... by doing that, you null them!
give me a few minutes!

When I comment out the define in sub_routines.bas ( 'Public p_names(9) As String ), then I get this:

Error parsing program.
Error description: Undeclared variable 'p_names' is used before it was assigned any value.
Error occurred on line: 14 (sub_routines)
t = p_names(6)