getsymbolgroup("權證") 在選股腳本不正常

Hi 小編，

請教一下，以下的程式，我寫成指標腳本，動作是正常的，但寫成選股腳本，卻得不到任何資料。請問有什麼地方需要調整嗎？

group: _list();

var: _uSum(0), _dSum(0), _count(0), _cp("");

_list = getsymbolgroup("權證");

_uSum = 0; //買權加總

_dSum = 0; //賣權加總

_count = 0;

for value1 = 1 to groupSize(_list) begin

_cp = getsymbolinfo(_list[value1], "買賣權");

if _cp = "CALL" then _uSum += GetField("收盤價", "D") * getsymbolField(_list[value1], "Volume", "D", default:=0) * GetSymbolInfo(_list[value1],"執行比例")*100*GetField("面額", "D");

if _cp = "PUT" then _dSum += GetField("收盤價", "D") * getsymbolField(_list[value1], "Volume", "D", default:=0) * GetSymbolInfo(_list[value1],"執行比例")*100*GetField("面額", "D");

//print("Close", getsymbolField(_list[value1], "Close", "D", default:=0) );

//print("Volume", getsymbolField(_list[value1], "Volume", "D", default:=0));

//print("groupSize", groupSize(_list));

//print("買賣權", getsymbolinfo(_list[value1], "買賣權"));

//print("執行比例", GetSymbolInfo(_list[value1],"執行比例"));

end;

Ret = 1;

outputfield(1, _uSum, 2, "近一筆買權權利金加總金額", order := 1);

outputfield(2, _dSum, 2, "近一筆賣權權利金加總金額");

outputfield(3, groupSize(_list), 2, "groupSize");

//plot1(_uSum, "近一筆買權權利金加總金額");

//plot2(_dSum, "近一筆賣權權利金加總金額");