Need help on type indexing

Anyone can help..

How do we alter cetern value on spacific type without know their name. By using index for example.

This is example of using DIM

Dim Variable(100)
For k=1 To 100
	Variable(k)=Rand(1,100)
Next
Variable(33)=100

On the case of type I have some code like this:

Type Var
	Field Variable
End Type
For k=1 To 100
	a.var=New Var
	a\Variable=Rand(1,100)
Next
a\Variable(33)=100 <---This not work

Type Var
	Field Variable
End Type

Dim a.Var(100)


For k=1 To 100
	a(k)=New Var
	a(k)\Variable=Rand(1,100)

Next

a(33)\Variable=100

Each type variable that is created has a handle which is assigned to the variable you specify - in your example, "a" is the handle, but because you re-use it each time round the loop, it will only ever point to the LAST one you created (ie number 100).

You can create an array and assign each array element to the type variable, like this:

type Var
  field Variable
end type

dim my_type.var(100)
for k=1 to 100
  mytype(k)=new var
  mytype(k)\variable = rand(1,100)
next

; Now you can refer to each individually-
mytype(33)\variable=100

So, you might ask, if I still have to use an array, why bother with types at all? Well, the first answer is that each type can hold more fields than just the "variable" you have defined.

type Var
  field Variable
  field X_Coord
  field Y_Coord
  field name$
end type

dim my_type.var(100)
for k=1 to 100
  mytype(k)=new var
  mytype(k)\variable = rand(1,100)
  mytype(k)\x_coord = rand(1,1000)
  mytype(k)\y_coord = rand(1,1000)
next

; Now you can refer to each individually-
mytype(33)\variable=100
mytype(33)\name$="Foo"

mytype(62)\x_coord=123
mytype(62)\y_coord=101
mytype(62)\name$="Bar"

Hope this helps!

Oops - sorry GitTech, you beat me to it!

Thanks guys. It's help a lot.

But I still can make them dynamic enought since we use array in order to control each of them.

dim my_type.var(100) is fix to 100 object.

Refer to my case,
I have a list of contact information that I want user to enter. All this information I put in about 10 field like name,address,.... User can add as many as possible this contact information. This is control by index variable 'TotalData' which is increase everytime user add new information. Using array, I have to say how much is the data limit. But using type, I can't access and modify them easily.

How could I access the third data for example. In array just use name$(3) where 3 is the index of data that I want to access.

I love type because it's dynamic but can't access its eliment fast. Or anyone know any other trick.

Btw, thanks a lot for your help.

You could have an index field and increment it by one each time you add a new object. Then you can create as many as you want.

*EDIT*
i.e.

Type myType
   Field X
   Field Y
   Field Index
End Type

Global INDEX = 0

while not keydown(1)
if keydown(203) then 
  a.myType = new myType
    a\x = 10
    a\y = 10
    a\Index = INDEX
    INDEX=INDEX + 1
endif

if keydown(205) then
  for a.myType = Each myType
    if a\index = DESIRED_INDEX then
      ;do code for desired index
    endif
  next

wend
end

Look like, each time I want to change something I have to loop through all object. Any other fast method?

Btw, thank a lot PERTURBATIO. I will use your code style for now. That the best for my case.

Just make a really big array, 50000 indices or so. It's not going to take up all that much RAM these days. A few hundred KB at most.