C++ 如何在文本文件中搜索单词，如果找到则打印整行
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How to search for a word in a text file and if found print out the entire line
提问by Darius
My program needs to search for a word in a text file, and if it finds that word, to print out/display the entire line. Example:
我的程序需要在文本文件中搜索一个单词，如果找到该单词，则打印出/显示整行。例子：
employee name date joined position project annual salary tom jones 1/13/2011 accountant pricing 55000 Susan lee 2/5/2007 Manager policy 70000
User enters a search word:
用户输入搜索词：
accountant
会计
Program searches text for accountant. When it finds it, it returns the following:
程序搜索文本accountant。当它找到它时，它返回以下内容：
employee name date joined position project annual salary tom jones 1/13/2011 accountant pricing 55000
This is the code I came up with but it doesn't work.
这是我想出的代码，但它不起作用。
void KeyWord(ifstream &FileSearch)
{
string letters;
int position =-1;
string line;
ifstream readSearch;
cout<<"enter search word ";
cin>>letters;
"\n";
FileSearch.open("employee");
if(FileSearch.is_open())
{
while(getline(FileSearch, line))
{
FileSearch>>line;
cout<<line<<endl;
position=line.find(letters,position+1);
if(position==string::npos);
if(FileSearch.eof())
break;
cout<<line<<endl;
}
}
cout<<"Cant find"<<letters<<endl;
}
回答by Kevin
Easy answer:
简单回答：
void Keyword(ifstream & stream, string token) {
string line;
while (getline(stream, line)) {
if (line.find(token) != string::npos) {
cout << line << endl;
}
}
cout << token << " not found" << endl;
}
In general, avoid mixing <<and getlinetogether when reading from a streamas it causes strange issues with line endings.
一般来说，从 a 读取时避免混合<<和getline在一起，stream因为它会导致行尾出现奇怪的问题。
