PROSAGA码农传奇-Sahara云大数据-致命的字符串错误

<div class =“post-text”itemprop =“text”>
  
     <code>
 countries
 </code>
     是空的矢量，使用
     <code>
 push_back
 </code>
     添加新项目：
  
   <pre>
 <code>
 while (getline(inFile, line)) //This is the first time I am using getline I suspect I might be misusing it.
{
 //countries[i] = line;
 countries.push_back(line);
 i = i + 1;
}

</code>
 </pre>
  
    另一个问题：
  
   <pre>
 <code>
 if (line.find(countrycode) != -1)

</code>
 </pre>
  
    它应该改为
  
   <pre>
 <code>
 if (line.find(countrycode) == 0)

</code>
 </pre>
  
    因为您希望countrycode位于该行的开头。
  
  
     <code>
 std::string
 </code>
     还有许多其他功能，如
     <code>
 find_last_of
 </code>
     和
     <code>
 substr
 </code>
    ，使用它们而不是通过字符。
  
   <pre>
 <code>
 void findsitetype(string email)
{
 size_t dot = email.find_last_of('.');
 if (dot == string::npos || dot == (email.size() - 1))
 return;

string countrycode = email.substr(dot + 1);
    if (!countrycode.size())
        return;

vector<string> countries;
 if (countrycode == "edu") cout << "Educational institutions";
 else if (countrycode == "org") cout << "Not-for-profit organizations";
 else if (countrycode == "gov") cout << "Government entities";
 else if (countrycode == "mil") cout << "Military installations";
 else if (countrycode == "net") cout << "Network service providers";
 else if (countrycode == "com") cout << "Commercial ventures";
 else if (countrycode.size() == 2)
 {
 ifstream inFile("countries.txt");
 if (inFile.fail())
 {
 cout << "File not found.";
 exit(1);
 }
 else
 {
 string line;
 while (getline(inFile, line)) 
 countries.push_back(line);
 inFile.close();
 for (size_t j = 0; j < countries.size(); j++)
 {
 if (countries[j].find(countrycode) == 0)
 {
 line = countries[j];
 if (line.size() > 5)
 cout << "country: " << line.substr(5) << "\n";
 }
 }
 }
 }
}

</code>
 </pre>
</DIV>