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复制动态数组
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
type
TArr = array of Int64; {先把需要的动态数组数组定义成一个类型, 因为下面需要类型转换}
var
arr1,arr2: TArr; {两个等待测试的数组变量}
p: Pointer; {该指针用于中转数组中的数据}
{先给第一个数组赋测试值}
procedure TForm1.FormCreate(Sender: TObject);
var
i: Integer;
begin
for i := 0 to 1000 - 1 do
begin
SetLength(arr1, Length(arr1)+1);
arr1[High(arr1)] := i * 2;
end;
{抽查显示}
ShowMessage(IntToStr(arr1[9])); {18}
end;
{复制到第二个数组}
procedure TForm1.Button1Click(Sender: TObject);
var
size: Cardinal;
begin
size := Length(arr1) * SizeOf(arr1[0]); {源数组大小}
GetMem(p, size); {根据源数组大小分配内存}
CopyMemory(p, arr1, size); {复制}
arr2 := TArr(p); {转换}
{抽查显示}
ShowMessage(IntToStr(arr2[9])); {18}
end;
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