How to make 'blue' variable?

2014 9 12
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更新时间：2014 9 15
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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 2014-9-12

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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.

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Mikhail
Mikhail 2014-9-15
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 2014-9-15
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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Mikhail
Mikhail 2014-9-15

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Look! only 1 global variable is defined, however you can see a lot of cyan variables.

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Mikhail
Mikhail 2014-9-15
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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