string的find("")

1         string TempRangeData1 = Excel_set->GetRangeData(count1+i, 3);
2 
3         string strleft;
4         int FindMin = TempRangeData1.find(("_"));
5         if (FindMin != -1)
6         {
7             strleft = (TempRangeData1.substr(0, TempRangeData1.find("_")));//提取左值
8         }