带有存储空字符的分隔符的 getline
我正在尝试使用 getline 输入一个分隔文本文件，但是当我调试它时，它显示变量开头有一个空字符。
这仅发生在我的 tID 变量上，该变量恰好是每行的第一个变量。当我调试时，它显示为字符数组：
[0] = '' [1] = '2' [2] = '3' [3] = '4'
这是相关代码：
ifstream inFile("books.txt");
if (!inFile){
cout << "File couldn't be opened." << endl;
return;
}
while(!inFile.eof()){
string tID, tTitle, tAuthor, tPublisher, tYear, tIsChecked;
getline(inFile,tID, ';');
getline(inFile,tTitle, ';');
getline(inFile,tAuthor, ';');
getline(inFile,tPublisher, ';');
getline(inFile,tYear, ';');
getline(inFile,tIsChecked, ';');
library.addBook(tID, tTitle, tAuthor, tPublisher, tYear, (tIsChecked == "0") ? false : true);
}
以下是 book.txt 的几行：
123;C++ Primer Plus; Steven Prata; SAMS; 1998;0;
234;Data Structures and Algoriths; Adam Drozdek; Course Technlogy; 2005;0;
345;The Art of Public Speaking; Steven Lucas;McGraw-Hill;2009;0;
456;The Security Risk Assessment Handbook; Douglas J. Landall;Auerbach;2006;1;
I am trying to input a delimited text file with getline but when I debug it it shows me that there is an empty character at the beginning of the variable.
This is only happening with my tID variable which happens to be the first on each line. When I debug it shows this as the character array:
[0] = ''
[1] = '2'
[2] = '3'
[3] = '4'
Here is the relevant code:
ifstream inFile("books.txt");
if (!inFile){
cout << "File couldn't be opened." << endl;
return;
}
while(!inFile.eof()){
string tID, tTitle, tAuthor, tPublisher, tYear, tIsChecked;
getline(inFile,tID, ';');
getline(inFile,tTitle, ';');
getline(inFile,tAuthor, ';');
getline(inFile,tPublisher, ';');
getline(inFile,tYear, ';');
getline(inFile,tIsChecked, ';');
library.addBook(tID, tTitle, tAuthor, tPublisher, tYear, (tIsChecked == "0") ? false : true);
}
Here are a few lines of book.txt:
123;C++ Primer Plus; Steven Prata; SAMS; 1998;0;
234;Data Structures and Algoriths; Adam Drozdek; Course Technlogy; 2005;0;
345;The Art of Public Speaking; Steven Lucas;McGraw-Hill;2009;0;
456;The Security Risk Assessment Handbook; Douglas J. Landall;Auerbach;2006;1;
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由于
;是getline的分隔符，因此它不会消耗换行符。将不带显式指定分隔符的getline调用或ignore( numeric_limits::max(), '\n' ) 添加到循环末尾。这样做的好处是忽略最后一个分号之后的数据。额外诊断代码：http://ideone.com/u9omo
Because
;is the delimiter forgetline, it doesn't consume the newline. Add agetlinecall without an explicitly specified delimiter, orignore( numeric_limits<streamsize>::max(), '\n' )to the end of the loop. This has the "bonus" of ignoring data after the last semicolon.Bonus diagnostic code: http://ideone.com/u9omo