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How to make 'blue' variable?

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Mikhail
Mikhail am 12 Sep. 2014
Kommentiert: Mikhail am 15 Sep. 2014
Hi all, I'm trying to make my own ImageViewer. Using some program as a template, I saw a lot of 'blue' variables in it (when I point on such variable there is a text "The scope of variable ... spans multiple function").
Now I understood, that I want to use such variables also - in callback functions to update text, data, and so on.
How can I create such variables? Short explanation of what does it mean is appreciated as well. Thanks.

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Image Analyst
Image Analyst am 12 Sep. 2014
Keywords are in pure blue. Global variables are in cyan. You can just put the line
global myVariable;
in any function that needs to see the global variable. Other than that, just create it and use it like any other variable.
  2 Kommentare
Mikhail
Mikhail am 15 Sep. 2014
But in that template there is only one variable defined as global. However there arre a lot of global variables. When I am trying to do that in my program, my callback function doesn't use it as global
Image Analyst
Image Analyst am 15 Sep. 2014
Post a screenshot of your screen so we can see it. In nwindows type alt-PrintScreen, then go to http://snag.gy and paste it in and give us the url or click on the green and brown image icon to paste it in your response here.

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Weitere Antworten (1)

Mikhail
Mikhail am 15 Sep. 2014
Look! only 1 global variable is defined, however you can see a lot of cyan variables.
  1 Kommentar
Mikhail
Mikhail am 15 Sep. 2014
Got it, in that template he just wrote callback function inside main function. Therefore variables which he used in both main and callback function automatically became cyan. Thanks

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