追捕oicq探测技术

追捕是怎样得到检测结果的呢？下面是具体实现的程序段:
MyStream := TMemoryStream.Create;
try
NMUDP1.ReadStream(MyStream);
SetLength(TmpStr,NumberBytes);
MyStream.Read(TmpStr[1],NumberBytes);
finally
MyStream.Free;
end;
j := Pos( #$02 +#$02 +#$00 +#$00 , TmpStr);
k := Pos( #$02 +#$03 +#$00 +#$00 , TmpStr);
m := Pos( #$02 +#$03 +#$0a +#$00 , TmpStr);
o := Pos( #$02 +#$03 +#$02 +#$00 , TmpStr);

if (j=1) or (k=1) or (m=1) or (o=1) then begin
j := Pos( #$02 +#$02 +#$00 +#$00 + y, TmpStr);
k := Pos( #$02 +#$03 +#$00 +#$00 + y, TmpStr);
m := Pos( #$02 +#$03 +#$0a +#$00 + y, TmpStr);
o := Pos( #$02 +#$03 +#$02 +#$00 + y, TmpStr);
OicqVer := 未知;
if j=1 then OicqVer := 425;
if k=1 then OicqVer := 725;
if m=1 then OicqVer := 820;
if o=1 then OicqVer := 810;
if (j=1) or (k=1) or (m=1) or (o=1) then begin
TmpS := ;
for j:=1 to length(TmpStr) do begin
if TmpStr[j] in [0..9] then tmpS := tmpS + TmpStr[j];
end;
if TmpS=0 then Label2.Caption := OICQ处于关闭状态，版本:+ OicqVer
else Label2.Caption :=OICQ号码为+ TmpS + ,版本:+ OicqVer;
end;

j := Pos( #$02 +#$02 +#$00 +#$00 + x, TmpStr);
k := Pos( #$02 +#$03 +#$00 +#$00 + x, TmpStr);
m := Pos( #$02 +#$03 +#$0a +#$00 + x, TmpStr);
o := Pos( #$02 +#$03 +#$02 +#$00 + x, TmpStr);
if (j=1) or (k=1) or (m=1) or (o=1) then begin
J := 8;
TmpOicqNUm := ;
While TmpStr[J]<>#$1f do begin
TmpOicqNum :=TmpOicqNum + TmpStr[J];
Inc(J);
end;
J := J + 6;
While TmpStr[J]<>#$1f do begin
Inc(J);
end;
J := J + 1;
While TmpStr[J]<>#$1f do begin
Inc(J);
end;
J := J + 1;
TmpOicqMsg := ;
While TmpStr[J]<>#$03 do begin
TmpOicqMsg := TmpOicqMsg + TmpStr[J];
Inc(J);
end;
if TmpOicqMsg<>LastOicqMessage then begin
LastOicqMessage := TmpOicqMsg;
Messagebox(Form1.handle, PChar(OICQ用户 + TmpOicqNum + 对你的探测作出回应： + #$0D + #$0A + TmpOicqMsg), 警告信息, MB_ICONWARNING +mb_ok);
end;
end;
exit;
end;