将文本文件读入字符串。C++ ifstream
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Read text file into string. C++ ifstream
提问by bulubuloa
void docDB(){
int sdb = 0;
ifstream dacb("kitudacbiet.txt");
if(!dacb.is_open())
cout<<"Deo doc dc file"<<endl;
else{
while(!dacb.eof()){
dacb>>dbiet[sdb].kitu;
dacb>>dbiet[sdb].mota;
//getline(dacb,dbiet[sdb].mota);
/*
string a="";
while((dacb>>a)!= '\n'){
//strcat(dbiet[sdb].mota,a);
dbiet[sdb].mota+=a;
}
*/
sdb++;
}
}
}
Text file: "kitudacbiet.txt"
文本文件：“kitudacbiet.txt”
\ Dau xuyet phai
@ Dau @
# Dau #
$ Ky hieu $
( Dau mo ngoac
) Dau dong ngoac
I want read firt string of line into dbiet[sdb].kitu and the rest of line into dbiet[sdb].mota
我想将第一行的字符串读入 dbiet[sdb].kitu 并将行的其余部分读入 dbiet[sdb].mota
Example: line 1 = \ Dau xuyet phai
示例：第 1 行 = \ Dau xuyet phai
dbiet[sdb].kitu = "\" and dbiet[sdb].mota = "Dau xuyet phai"
dbiet[sdb].kitu = "\" 和 dbiet[sdb].mota = "Dau xuyet phai"
I would like to read line by line until i met downline character ('\n'). How to do this. Sorry my english not good.Thank
我想逐行阅读，直到遇到下线字符（'\n'）。这该怎么做。对不起，我的英语不好。谢谢
回答by 111111
To read a whole line from a file into a string, use std::getlinelike so:
要将文件中的整行读入字符串，请使用std::getline如下命令：
std::ifstream file("my_file");
std::string temp;
std::getline(file, temp);
You can do this in a loop to until the end of the file like so:
您可以循环执行此操作，直到文件结束，如下所示：
std::ifstream file("my_file");
std::string temp;
while(std::getline(file, temp)) {
//Do with temp
}
References
参考
http://en.cppreference.com/w/cpp/string/basic_string/getline
http://en.cppreference.com/w/cpp/string/basic_string/getline
回答by Benjamin Lindley
It looks like you are trying to parse each line. You've been shown by another answer how to use getlinein a loop to seperate each line. The other tool you are going to want is istringstream, to seperate each token.
看起来您正在尝试解析每一行。另一个答案向您展示了如何getline在循环中使用来分隔每一行。您将需要的另一个工具是istringstream, 分离每个令牌。
std::string line;
while(std::getline(file, line))
{
std::istringstream iss(line);
std::string token;
while (iss >> token)
{
// do something with token
}
}
回答by Taimur Amjad
getline(fin, buffer, '\n')
where finis opened file(ifstream object) and bufferis of string/chartype where you want to copy line.
getline(fin, buffer, '\n')
在哪里fin打开文件（ifstream 对象）并且buffer是string/char您要复制行的类型。
