QUESTION that does not require snippets

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mindsclay

12

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Joined: 1st May 2012

Location: Rocklin, CA, USA

Posted: 6th Oct 2013 20:06

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Is there prescedence for UDT fields to swap when passed to a function?

For example, pos.X=10 and pos.Y=20 outside the function.

But in the function it is pos.X=20 and pos.Y=10

I copied/pasted the function and calling code into another project and it works fine. I then copied/pasted from the new project into the old, and still same problem.

I am not going to spend all day on this, I am just asking a question. (see first sentance)

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mindsclay

12

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Joined: 1st May 2012

Location: Rocklin, CA, USA

Posted: 6th Oct 2013 20:08 Edited at: 6th Oct 2013 20:13

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Okay, maybe a little snippet.

+ Code Snippet

TYPE _position_
    pos.X
    pos.Y
ENDTYPE

pos.X=10
pos.Y=20
function1(pos)

END

FUNCTION function1(pos AS _position_)

ENDFUNCTION

Inside the function I am getting pos.X=20 and pos.Y=10.

I copied/pasted the same exact code into another project and I get the correct results. But in the original code, I need to use this instead:

+ Code Snippet

TYPE _position_
    pos.X
    pos.Y
ENDTYPE

pos.X=10
pos.Y=20
function1(pos.X,pos.Y)

END

FUNCTION function1(posX,posY)

ENDFUNCTION

In order for it to work correctly.

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Digital Awakening

AGK Developer

22

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Joined: 27th Aug 2002

Location: Sweden

Posted: 6th Oct 2013 21:29

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First make sure you are using the latest beta of AppGameKit, older versions have problems with passing UDTs.

Your code has some errors. Here's a working example.

+ Code Snippet

TYPE _position_
    X
    Y
ENDTYPE
pos as _position_
pos.X=10
pos.Y=20

do
	function1(pos)
	if getpointerpressed() = 1 then end
	Sync()
loop

FUNCTION function1(pos AS _position_)
	print( pos.X )
	print( pos.Y )
ENDFUNCTION

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Ancient Lady

Valued Member

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Joined: 17th Mar 2004

Location: Anchorage, Alaska, USA

Posted: 6th Oct 2013 22:58

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Yup, you forgot to declare the variable pos used in the function call as a _position_ so the compiler didn't really know what to do with it.

But real problem is your UDT definition:

+ Code Snippet

TYPE _position_
    pos.X
    pos.Y
ENDTYPE

It should be (assuming X and Y are being used for sprite/pointer positions which take floating point):

+ Code Snippet

TYPE _position_
    X AS float
    Y As float
ENDTYPE

And the compiler probably should have complained about your _position_ definition.

(See, the code snippet was definitely needed so that we could see how the UDT was being defined.)

Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master

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mindsclay

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Joined: 1st May 2012

Location: Rocklin, CA, USA

Posted: 6th Oct 2013 23:02 Edited at: 6th Oct 2013 23:04

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I checked my code and I have it correct. I merely typed my snippet incorrectly.

I have the latest beta from my product list. Is there another way to get the latest?

I am seeing this happen in places it wasn't happening yesterday.

Anyway, the problem is a swapping of the variables when it is in the function. I have no errors from the compiler. I have the values printing to screen and I can see the variable outside the function and inside the function. The variables are swapped.

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Digital Awakening

AGK Developer

22

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Joined: 27th Aug 2002

Location: Sweden

Posted: 6th Oct 2013 23:12

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Exceeding indexes for UDT arrays does not always generate an error message. If you have random things happening it could be that. Otherwise I would guess it is your code.

One way to find the problem is to delete large chunks of code until it runs. With the UDT array bug in mind, your problem could be anywhere.

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Ancient Lady

Valued Member

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Joined: 17th Mar 2004

Location: Anchorage, Alaska, USA

Posted: 6th Oct 2013 23:13

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The 'My Product' list has the latest beta (v10819).

Are you sure that the UDT variable you are setting and passing into the function has been properly declared before you use it in any way? (It isn't in your snippet, but maybe that was a typo as well.)

Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master

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