Question

我让我的程序从.csv文件中读取并输出数据，但我不希望它输出第一行。我尝试使用getline(data, line);和stream.ignore ( std::numeric_limits<std::streamsize>::max(), '\n' );。虽然它确实跳过第一行，但最后两行打印两次并混合在一起。

string ID;
string sentenceIn;
string servedIn;
int sentence;
int served;
string lastName;
string firstName;

vector<string> idNum;
vector<string> sentenceLen;
vector<string> servedTime;
vector<string> lastNameIn;
vector<string> firstNameIn;


ifstream data("prisoner_data.csv");

if (data.is_open())
{
    cout << "File opened successfully." << endl << endl;
    while (data.good()) // !someStream.eof()
    {
        getline(data, ID, ',');
        cout << ID << "  ";
        idNum.push_back(ID);

        getline(data, sentenceIn, ',');
        cout << sentenceIn << "  ";
        sentenceLen.push_back(sentenceIn);
        istringstream(sentenceIn) >> sentence;

        getline(data, servedIn, ',');
        cout << servedIn << "  ";
        servedTime.push_back(servedIn);
        istringstream(servedIn) >> served;

        getline(data, lastName, ',');
        lastNameIn.push_back(lastName);
        cout << lastName << "  ";

        getline(data, firstName, ',');
        firstNameIn.push_back(firstName);
        cout << firstName << "  ";
    }
}

如果不弄乱最后一行，我该怎么做才能跳过第一行呢？

Answer 1

while (data.good())很可疑。你最终＆＃34;吃＆＃34;还有一行。参见例如Why is iostream::eof inside a loop condition considered wrong?了解更多详情。您通常必须直接在getline中测试while的结果，例如

while(getline(data, line)){...}

一种可能的解决方案是逐行阅读文件while(getline(data, line)){...}，然后使用stringstream(line)，对于每一行，再次使用getline进行解析，现在由{{1}分隔}。要跳过第一行，请先执行,，然后使用getline(data, line);进行跟进。下面是一个简单的例子：

while(getdata(data, line)){ /* process line */}

c ++跳过第一行csv文件

1 个答案: