line1.points 返回的是一个内存地址值,integer类型的,我怎么把它强制转换类型给p啊,p有如下定义:
type
Tpoint = record
x:real;
y:real;
end;
p :^tpoint;
我用了p:=Ptr(Line1.Points),但是不能访问p[0];为什么啊,怎么修改,多谢了
type
Tpoint = record
x:real;
y:real;
end;
p :^tpoint;
我用了p:=Ptr(Line1.Points),但是不能访问p[0];为什么啊,怎么修改,多谢了
有谁帮忙把下面这句c++语句变成delphi吗?谢了
struct TDoublePoint
{
double x, y;
}; TDoublePoint* dp = (TDoublePoint*)Line1->Points;(假设线条对象叫做Line1)
TPoint = record
x: Real;
y: Real;
end;
PPoint = ^TPoint;
TPoints = array[0..100] of TPoint;
PPoints = ^TPoints;
var
P: ^PPoint;
D: TPoint;
begin
D.x := 123.456;
P := @D;
Caption := FloatToStr(PPoints(P)^[0].x);
end;
type
TPoint = record
x: Real;
y: Real;
end;
PPoint = ^TPoint;
TPoints = array[0..100] of TPoint;
PPoints = ^TPoints;
var
P: ^PPoint;
D: TPoint;
begin
D.x := 123.456;
P := @D;
Caption := FloatToStr(PPoints(P)^[0].x);
end;
中的哪个值啊