从长字符串中获取想要的字符串

char hh[512]={0};

strcpy(hh,"PrinterSerialNumber:G11404;PrinterStatus");

string str;
str=hh;
str=str.replace(str.find("PrinterSerialNumber:"),strlen("PrinterSerialNumber:"),"");
str=str.replace(str.find("PrinterSerialNumber:"),strlen(";PrinterStatus"),"");