does Type Array in Type not working ?

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Freddix

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Posted: 25th Apr 2019 21:26 Edited at: 25th Apr 2019 22:07

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Hello.

I experience a problem using Types.

I setup my 1st type :

+ Code Snippet

Type Default_Type
  Value As Integer
EndType
Default As Default_Type

And then my 2nd that contain an array of type 1 :

+ Code Snippet

Type SecondOne_Type
  myDefault As Default_Type[]
EndType
SecondOne As SecondOne_Type

If somewhere in my program I create a new data like :

+ Code Snippet

Test As Default_Type

And if I try to insert in SecondOne from inside a function that requested my type as parameter, :

+ Code Snippet

SecondOne.myDefault.insert( Test )

I get no error but length always return empty list from outside the method ....
SecondOne.myDefault.length -> -1

Is this normal ? What Am I doing wrong ?

Regards,

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fubarpk

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Posted: 25th Apr 2019 21:56

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can you use program comment blocks in future it helps

+ Code Snippet

mydata as SecondOneType
mydata.mydefault=(random(1,100)
SecondOne.myDefault.insert( mydata )

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Freddix

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Posted: 25th Apr 2019 22:04 Edited at: 25th Apr 2019 22:08

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@fubarpk : Sorry.

I think I've found the problem.
It's the way AppGameKit work.

When I request a type as a function parameter, when I call this function with my object, AppGameKit creates a copy of the object that will be sent to the function.
If I modify the 2nd type inside my function , it will not affect the object used as parameter of the function (the 2nd type from the object outside the method is unchanged)
I must then return the new object from the function and affect my old object with the new one from the function.
It's a strange behaviour ... that is really annoying with deep type/arrays/dynamic works....

It caused me another problem. I have a global type array :

+ Code Snippet

Type PKTiles_Type
...
EndType
Global PKTile As PKTiles_Type[]             // Gestion dynamique des tiles.

If I insert an element inside the global type array from inside a method/function, the global type array is unchanged...
Exemple from a function :

+ Code Snippet

newTile As PKTiles_Type
newTile.xxx = xxx
...
PKTile.insert( newTile )

PKTile.length = 1 from inside the function ...
But when I leave it, the global PKTile.length -> <Empty> array...

Is this a bug or a specific choice ?

PS : I've updated the 1st message with more precise details as I was from your answer that I forgot to mention specific information concerning this problem. Sorry.

Regards,

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blink0k

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Posted: 25th Apr 2019 22:21

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That should work. I know it works for me.
I know that i used to get a lot of these issues before i started using #option_explicit which forces you to define all your variables before using them

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Freddix

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Posted: 25th Apr 2019 22:30

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Hello nlinkOk, , use of #option_explicit did change ..... nothing ...

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blink0k

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Posted: 25th Apr 2019 22:45

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ok then. This works ok for me

+ Code Snippet


// Project: test46 
// Created: 2019-04-26

// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts

Type PKTiles_Type
	xxx as integer
EndType

Global PKTile As PKTiles_Type[]         


For i=0 to 10
	AddTile()
next

do
    

    Print( PKTIle.length )
    Sync()
loop


function	AddTile()
	newTile As PKTiles_Type
	newTile.xxx = 0

	PKTile.insert( newTile )
endfunction

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Freddix

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Posted: 25th Apr 2019 22:52 Edited at: 25th Apr 2019 22:53

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@blinkOk:
Yes,

But this don't work :

// Project: test46 
// Created: 2019-04-26
 
// show all errors
SetErrorMode(2)
 
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
 
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
 
Type PKTiles_Type
    xxx as integer
EndType

Global PKTile As PKTiles_Type[]

PKTile = CreateAllTiles()
 
do
    Print( PKTIle.length )
    Sync()
loop

function AddTile( dPKTile as PKTiles_Type[] )
	newTile As PKTiles_Type
	newTile.xxx = 0
	dPKTile.insert( newTile )
endfunction

Function CreateAllTiles()
	rPKTile As PKTiles_Type[]
	For i=0 to 10
		AddTile( rPKTile )
	next
EndFunction rPKTile

+ Code Snippet

// Project: test46 
// Created: 2019-04-26
 
// show all errors
SetErrorMode(2)
 
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
 
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
 
Type PKTiles_Type
    xxx as integer
EndType

Global PKTile As PKTiles_Type[]

PKTile = CreateAllTiles()
 
do
    Print( PKTIle.length )
    Sync()
loop

function AddTile( dPKTile as PKTiles_Type[] )
	newTile As PKTiles_Type
	newTile.xxx = 0
	dPKTile.insert( newTile )
endfunction

Function CreateAllTiles()
	rPKTile As PKTiles_Type[]
	For i=0 to 10
		AddTile( rPKTile )
	next
EndFunction rPKTile

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Ortu

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Posted: 25th Apr 2019 22:54

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You can pass by reference using the ref keyword to alter the udt from the function scope if you don't want to make it global

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Freddix

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Posted: 25th Apr 2019 22:57

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Ortu ?

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blink0k

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Posted: 25th Apr 2019 23:04 Edited at: 25th Apr 2019 23:05

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Yes because it makes a copy of the array when it calls the function. I don't see why you would want to pass a global as a parameter though.
Ortu is referring to;

function AddTile( dPKTile ref as PKTiles_Type[] )

Which passes the actual value rather than a copy

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Freddix

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Posted: 25th Apr 2019 23:12 Edited at: 25th Apr 2019 23:13

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Yes, the sample was not perfect ...
I copy directly from my source code as in my dev. I don't pass the global as argument.

In the main source code :

Here is exactly what I have (simplified) in my project :

// Project: test46 
// Created: 2019-04-26
 
// show all errors
SetErrorMode(2)
 
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
 
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts

// ****************************************** 
Type PKTiles_Type
    xxx As Integer
EndType
Global PKTile As PKTiles_Type[]             // Gestion dynamique des tiles.

PKCreateTile( 1, 1 )
PKPasteTile( 1, 0, 0 )

Function PKCreateTile( ImageID As Integer, TransparencyMODE As Integer )
	newTile As PKTiles_Type
	TileID As Integer = -1
	newTile.xxx = 0
	PKTile.insert( newTile )
	TileID = PKTile.length
EndFunction TileID

Function PKPasteTile( TileID As Integer, XPos As Integer, YPos As Integer )
	if TileID > 0 and TileID < ( PKTile.length + 1 )
		// Draw The tile
	Else
		Message( "2DPluginKIT Ver 2.0 Error : PKPastetile #" + Str( TileID ) + " - Incorrect TileID ( range 1-" + Str( PKTile.length ) + " )" )
	Endif
EndFunction

+ Code Snippet

// Project: test46 
// Created: 2019-04-26
 
// show all errors
SetErrorMode(2)
 
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
 
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts


// ****************************************** 
Type PKTiles_Type
    xxx As Integer
EndType
Global PKTile As PKTiles_Type[]             // Gestion dynamique des tiles.


PKCreateTile( 1, 1 )
PKPasteTile( 1, 0, 0 )

Function PKCreateTile( ImageID As Integer, TransparencyMODE As Integer )
	newTile As PKTiles_Type
	TileID As Integer = -1
	newTile.xxx = 0
	PKTile.insert( newTile )
	TileID = PKTile.length
EndFunction TileID


Function PKPasteTile( TileID As Integer, XPos As Integer, YPos As Integer )
	if TileID > 0 and TileID < ( PKTile.length + 1 )
		// Draw The tile
	Else
		Message( "2DPluginKIT Ver 2.0 Error : PKPastetile #" + Str( TileID ) + " - Incorrect TileID ( range 1-" + Str( PKTile.length ) + " )" )
	Endif
EndFunction

When I use PKPasteTile, I get the message, and you can see that PKTile.length = 0 and TileID = 1 (tile created successfully and inserted successfully)

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blink0k

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Posted: 25th Apr 2019 23:41 Edited at: 25th Apr 2019 23:51

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Arrays are stored from zero and .length will point to the last element
so a length of -1 means an empty array
a length of zero means the array has one element

So TileID is 1 and it fails the test because 1 is NOT less that .length + 1 (which is 1)
if TileID > 0 and TileID < ( PKTile.length + 1 )

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Freddix

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Posted: 26th Apr 2019 10:07

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@blink0k:

I have updated my code to works like you said and it does not fix my problem. I really think there's a bug there
Look at this piece of code :

// Project: test46 
// Created: 2019-04-26
  
// show all errors
SetErrorMode(2)
  
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
  
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
 
 myTileID As Integer
// ****************************************** 
Type PKTiles_Type
    xxx As Integer
EndType
Global PKTile As PKTiles_Type[]             // Gestion dynamique des tiles.
 
myTileID = PKCreateTile( 1, 1 )
PKPasteTile( myTileID, 0, 0 )
 
Function PKCreateTile( ImageID As Integer, TransparencyMODE As Integer )
    newTile As PKTiles_Type
    TileID As Integer = -1
    newTile.xxx = 0
    PKTile.insert( newTile )
    TileID = PKTile.length - 1 // To start index at 0
EndFunction TileID
 
 
Function PKPasteTile( TileID As Integer, XPos As Integer, YPos As Integer )
    if TileID > -1 and TileID < PKTile.length 
        // Draw The tile
    Else
        Message( "2DPluginKIT Ver 2.0 Error : PKPastetile #" + Str( TileID ) + " - Incorrect TileID ( range 0-" + Str( PKTile.length ) + " )" )
    Endif
EndFunction

+ Code Snippet

// Project: test46 
// Created: 2019-04-26
  
// show all errors
SetErrorMode(2)
  
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
  
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
 
 myTileID As Integer
// ****************************************** 
Type PKTiles_Type
    xxx As Integer
EndType
Global PKTile As PKTiles_Type[]             // Gestion dynamique des tiles.
 
myTileID = PKCreateTile( 1, 1 )
PKPasteTile( myTileID, 0, 0 )
 
Function PKCreateTile( ImageID As Integer, TransparencyMODE As Integer )
    newTile As PKTiles_Type
    TileID As Integer = -1
    newTile.xxx = 0
    PKTile.insert( newTile )
    TileID = PKTile.length - 1 // To start index at 0
EndFunction TileID
 
 
Function PKPasteTile( TileID As Integer, XPos As Integer, YPos As Integer )
    if TileID > -1 and TileID < PKTile.length 
        // Draw The tile
    Else
        Message( "2DPluginKIT Ver 2.0 Error : PKPastetile #" + Str( TileID ) + " - Incorrect TileID ( range 0-" + Str( PKTile.length ) + " )" )
    Endif
EndFunction

Now it return that tileID = -1 and PKTile.length = 0
Popup message said : "PKPastetile #-1 - IncorrectTileID ( range 0-0 )"
There is probably a bug there.

Regards

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fubarpk

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Posted: 26th Apr 2019 10:26 Edited at: 26th Apr 2019 10:45

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why are you returning the length-1 because the first element will be 0 and the length will be 0 when you take 1 from 0 it will be -1 its working as arrays should

// Project: test46 
// Created: 2019-04-26
  
// show all errors
SetErrorMode(2)
  
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
  
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
 
 myTileID As Integer
// ****************************************** 
Type PKTiles_Type
    xxx As Integer
EndType
Global PKTile As PKTiles_Type[]             // Gestion dynamique des tiles.
 
myTileID = PKCreateTile( 1, 1 )
PKPasteTile( myTileID, 0, 0 )
 
Function PKCreateTile( ImageID As Integer, TransparencyMODE As Integer )
    newTile As PKTiles_Type
    TileID As Integer = 0
    newTile.xxx = 0
    PKTile.insert( newTile )
    //TileID = PKTile.length - 1 // To start index at 0
EndFunction PKTile.length
 
 
Function PKPasteTile( TileID As Integer, XPos As Integer, YPos As Integer )
    if TileID > -1 //and TileID < PKTile.length 
        // Draw The tile
    Else
        Message( "2DPluginKIT Ver 2.0 Error : PKPastetile #" + Str( TileID ) + " - Incorrect TileID ( range 0-" + Str( PKTile.length ) + " )" )
    Endif
EndFunction

+ Code Snippet

// Project: test46 
// Created: 2019-04-26
  
// show all errors
SetErrorMode(2)
  
// set window properties
SetWindowTitle( "test46" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window
  
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
 
 myTileID As Integer
// ****************************************** 
Type PKTiles_Type
    xxx As Integer
EndType
Global PKTile As PKTiles_Type[]             // Gestion dynamique des tiles.
 
myTileID = PKCreateTile( 1, 1 )
PKPasteTile( myTileID, 0, 0 )
 
Function PKCreateTile( ImageID As Integer, TransparencyMODE As Integer )
    newTile As PKTiles_Type
    TileID As Integer = 0
    newTile.xxx = 0
    PKTile.insert( newTile )
    //TileID = PKTile.length - 1 // To start index at 0
EndFunction PKTile.length
 
 
Function PKPasteTile( TileID As Integer, XPos As Integer, YPos As Integer )
    if TileID > -1 //and TileID < PKTile.length 
        // Draw The tile
    Else
        Message( "2DPluginKIT Ver 2.0 Error : PKPastetile #" + Str( TileID ) + " - Incorrect TileID ( range 0-" + Str( PKTile.length ) + " )" )
    Endif
EndFunction

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Freddix

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Posted: 26th Apr 2019 11:12 Edited at: 26th Apr 2019 11:24

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@Fubark

From blink0k :

Quote: "Arrays are stored from zero and .length will point to the last element
so a length of -1 means an empty array
a length of zero means the array has one element"

And I read it incorrectly because it's illogic for me to have a array.length = 0 when the array contains 1 element, so my mind integrated this information incorrectly.
Now I understand this strange behaviour of AppGameKit ... It's different from all languages (like Java, C, etc... where length is really the amount of elements from 0 to len-1)

As a final note .length is not the best word for this command/function/method. It's incorrect as it does not represent the true length of the array (in amount of elements) for this method the name should be more like .lastmembernumber or .lastmemberid, etc.

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fubarpk

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Posted: 26th Apr 2019 11:23

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I Agree I Think originally it did return the lastmember + 1 which in fact was the length
but a update fixed that issue

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Freddix

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Posted: 26th Apr 2019 12:09 Edited at: 26th Apr 2019 14:44

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The worst is that I have no way to make a generic method/function that allow me to get the true length of an array of any kind like getArrayLength( Array as Array ).
I am used to code under Java & C so the AppGameKit behaviour is confusing ...

Thank you all for your helps.

Regards,

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Ortu

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Posted: 28th Apr 2019 05:10

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The way array length is handled is consistent with dark basic classic and dark basic pro.

That's just how this language is.

Python is different from most languages in how it handles block scoping by indention level rather than some sort of closure symbol, that's just part of the language.

It isn't going to change to adhere to what is common, and doesn't need to. Neither does array.length

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blink0k

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Posted: 29th Apr 2019 04:38

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I found it odd to start with but as you begin to code it becomes very convenient.
.length will always point to the last element in the array (Unless it's empty)

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