变量赋值后仍为nil的有关问题

变量赋值后仍为nil的问题
程序中,对变量赋值操作都是类似的,而uob1赋值能成功,而uob2,uob3赋值后仍为nil
flow1赋值能成功,而flow2赋值后仍为nil;这是为什么啊,急...,请高人指点,
Tflow,Tuob 是自定义的类.
type
queueptr=^queuenode;
queuenode=record
data:Tflow;
next:queueptr;
end;
linkedquetp=record
front,rear:queueptr;
end;
var
flow1,flow2:Tflow;
re1:TRectBox;
uob1,uob2,uob3:Tuob;
count:integer;//活动数量
number:integer;//flow数量
num:integer;//use_flow数量
type uobarray=array of Tuob;
var uobar:uobarray;
type flowarray=array of Tflow;
var flowar:flowarray;
type usearray=array of Tuse_res;
var usear:usearray;
implementation
//确定活动：按照活动的顺序存入数组
procedure GetUobs();
var i,j:integer;
begin
count:=0;
for i:=0 to FrmMain.ComponentCount-1 do
begin
if midstr(FrmMain.Components[i].Name,1,3)= 'Uob ' then
count:=count+1;
end;
setlength(uobar,count);
count:=0;
for i:=0 to FrmMain.ComponentCount-1 do
begin
if midstr(FrmMain.Components[i].Name,1,3)= 'Uob ' then
begin
uob1:=Tuob(FrmMain.Components[i]);
uobar[count]:=uob1;
count:=count+1;
end;
end;
//排序
for i:=0 to count-1 do
begin
uob1:=uobar[i];
for j:=i+1 to count-1 do
begin
if uobar[j].Left <uob1.Left then
begin
uob2:=uob1;
uob1:=uobar[j];
uobar[j]:=uob2;
end;
end;
uobar[i]:=uob1;
end;
end;
//获得flow,按模型中从左到右顺序存入数组

procedure Getflows();
var i,j:integer;
begin
number:=0;
for i:=0 to FrmMain.ComponentCount-1 do
begin
if midstr(FrmMain.Components[i].Name,1,3)= 'Flo ' then
number:=number+1;
end;
setlength(flowar,number);
number:=0;
for i:=0 to FrmMain.ComponentCount-1 do
begin
if midstr(FrmMain.Components[i].Name,1,3)= 'Flo ' then
begin
flow1:=Tflow(FrmMain.Components[i]);
flowar[number]:=flow1;
number:=number+1;
end;
end;

//排序
for i:=0 to count-1 do
begin
flow1:=flowar[i];
for j:=i+1 to count-1 do
begin
if flowar[j].Left <flow1.Left then
begin
flow2:=flow1;
flow1:=flowar[j];
flowar[j]:=flow2;
end;
end;
flowar[i]:=flow1;
end;
end;

//确定预计活动时间（EST， LET）
procedure CalcuEAI();
var i,j,m,n:integer;
jun1:Tjunction;
begin
GetUobs();
Getflows();
n:=0;
uobar[0].EST:=0;
uobar[0].LET:=strtoint(uobar[0].max_dur);
for i:=0 to number-1 do
begin
//与
if (midstr(flowar[i].begin_id,1,3)= 'Jan ') and(midstr(flowar[i].end_id,1,3)= 'Uob ') then
begin
for j:=0 to FrmMain.ComponentCount-1 do
begin

if FrmMain.Components[j].Name=flowar[i].begin_id then
begin
jun1:=Tjunction(FrmMain.Components[j]);
break;
end;
end;
if jun1.juntype= '扇出 ' then
begin
for j:=0 to number-1 do
begin
if flowar[j].end_id=jun1.Name then
begin
for m:=0 to count-1 do
begin
if flowar[j].begin_id=uobar[m].Name then
uob1:=uobar[m];
if flowar[i].end_id=uobar[m].Name then
uob2:=uobar[m];
end;
break;

end;
end;
uob2.EST:=uob1.EST+strtoint(uob1.min_dur);
uob2.LET:=uob1.LET+strtoint(uob2.max_dur);
end;
if jun1.juntype= '扇入 ' then
begin
for j:=0 to number-1 do
begin
if flowar[j].end_id=jun1.Name then
begin
for m:=0 to count-1 do
begin
if (flowar[j].begin_id=uobar[m].Name)and (n=0) then
begin
uob1:=uobar[m];
n:=n+1;
end;
if (flowar[j].begin_id=uobar[m].Name)and (n=1) then
begin
uob3:=uobar[m];

n:=n+1;
end;
if flowar[i].end_id=uobar[m].Name then
uob2:=uobar[m];
end;
end;
end;
if (uob1.EST+strtoint(uob1.min_dur))> (uob3.EST+strtoint(uob3.min_dur)) then
uob2.EST:=uob1.EST+strtoint(uob1.min_dur)
else
uob2.EST:=uob3.EST+strtoint(uob3.min_dur);

if uob1.LET > uob3.LET then
uob2.EST:=uob1.LET+strtoint(uob2.max_dur)
else
uob2.EST:=uob3.LET+strtoint(uob2.max_dur);
n:=0;
end;
end;

end;

[解决办法]
十分的凌乱
[解决办法]
//
if uobar[j].Left <uob1.Left then
begin
uob2:=uob1;
uob1:=uobar[j];
uobar[j]:=uob2;
break; // < < < < < < < <如果没有猜错，应该加上个跳出循环
end;
[解决办法]
有可能像楼上说的。
因为是在循环里面赋值，有可能最后的时候是个空的了。
你可以追踪一下结果测试一下
------解决方案--------------------

我觉上次的分析不对

if uobar[j].Left <uob1.Left then // < < < <有可能是这个条件没有成立过
begin
uob2:=uob1; // < < < < <关键是这句话没有被执行
uob1:=uobar[j];
uobar[j]:=uob2;
end;

楼主自己调试看看吧

变量赋值后仍为nil的有关问题

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