How do I declare an array whose length is given at runtime?
I need to declare an array with user defined size. This array is inside a rather large program, and changing the list can be quite problematic.
Now my array is declared like this:
Buffer: array[0..myCostant * 2] of Byte;
and myCostant
, as he says, a constant already defined. Now I need to use the variable, getting something like this:
Buffer: array[0..myVar * 2] of Byte;
but i cant use variables inside array definition.
How can I solve this without changing my array in something else? This variable is bounded at the top, so I can declare an array with this maximum size and shrink it with another command?
source to share
You have to use dynamic arrays :
var
Buffer: array of Byte;
begin
SetLength(Buffer, myVar*2 + 1);
Alternatively, you can use a static array of known upper-bound length and write the current "significant" length of the array in a variable, for example CurrentLength
.
Then you can replace for example
for i := 0 to Length(Buffer) - 1 do
SomethingWith(Buffer[i]);
by
for i := 0 to CurrentLength - 1 do
SomethingWith(Buffer[i]);
source to share