((CComboBox*)GetDlgItem(IDC_COMBO2))->AddString("1000以下");((CComboBox*)GetDlgItem(IDC_COMBO2))->AddString("1000元－2000元");((CComboBox*)GetDlgItem(IDC_COMBO2))->AddString("2000-3000");((CComboBox*)GetDlgItem(IDC_COMBO2))->AddString("3000以上");這段有問題嗎？為什么編譯的時候說錯呢‘error C2065: 'IDC_COMBO2' : undeclared identifierF:\vc++程序\lesson8\Prop\Prop3.cpp(59) : error C2227: left of '->AddString' must point to class/struct/unionF:\vc++程序\lesson8\Prop\Prop3.cpp(60) : error C2227: left of '->AddString' must point to class/struct/unionF:\vc++程序\lesson8\Prop\Prop3.cpp(61) : error C2227: left of '->AddString' must point to class/struct/unionF:\vc++程序\lesson8\Prop\Prop3.cpp(62) : error C2227: left of '->AddString' must point to class/struct/unionError executing cl.exe.Prop.exe - 5 error(s), 0 warning(s)