Accessing a array instance variable is declared in VAR

2020-02-27T14:30:49.585000Z

Thank you for your reply.

I'll try to create some methods to access internal variables indirectly.

Accessing a array instance variable is declared in VAR

2020-02-27T14:30:49.028000Z

Originally created by: scott_cunningham

VARs are considered private variables by design. This is desired and a good thing. Now, to address your situation...

Option 1) create a method for FB_FrameBuffer, that's takes the 2D arguments as VAR_INPUTS and returns the FB_Pixel. This may, or may not be the best solution, depending on the size of FB_Pixel.

Option 2) rethink your solution. If FB_Painter should not be bothered by buffering details, then it should not need direct access to the array. Instead, FB_FrameBuffer should have methods and properties that FB_Painter can use to command general things like: GetNextPixel() or MoveLeft() or whatever you are trying to achieve. If FB_Painter should access the 2D array, then maybe it should be defined there, which then why have FB_FrameBuffer....

Accessing a array instance variable is declared in VAR

2020-02-27T14:30:47.693000Z

I've created three of FBs : FB_Framebuffer, FB_Pixel, FB_Painter. And I've added a instance for 2D array of FB_Pixel in FB_Framebuffer.

As you see the code, In FB_Painter I want to access the 2D array variable is declared in VAR.
But, I couldn't access it. How can I access the instance variable keeping it in VAR region of FB_Framebuffer without VAR_IN or VAR_OUT? Is it possible via Property, Reference or Pointer?

FUNCTION_BLOCK  FB_Framebuffer
VAR
   Buffer : ARRAY[0..1, 0..1023] OF FB_Pixel;
END_VAR

FUNCTION_BLOCK  FB_Painter
VAR
   FrameBuffer : FB_Framebuffer;
END_VAR

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