我的下一步是尝试getcwd（），但我想知道我的代码中是否有错误，我没有看到。 student_status.txt位于正确的文件夹中，我尝试了完整的文件路径。
此外，代码会编译并通知我该文件未打开。
有什么想法吗？
using namespace tenPoint;
int main()
{
string name;
char grade;
double average;
cout << "test";
ifstream fileRead;
fileRead.open("student_status.txt");
if (fileRead.is_open())
{
while (!fileRead.eof())
{
getline(fileRead, name);
fileRead >> average;
fileRead.ignore();
switch (finalGrade)
{
case F:
grade = 'F';
case D:
grade = 'D';
case C:
grade = 'C';
case B:
grade = 'B';
case A:
grade = 'A';
}
cout << name << " " << average << " " << finalGrade << endl;
}
fileRead.close();
}
else
cout << "file wasn't open";
}
答案 0 :(得分：1)
我必须在finalGrade循环中注释掉所有内容（std未定义），将名称空间更改为#include并为iostream添加fstream行和 fileRead.open("student_status.txt");
以使程序编译。将源文件放在我的桌面上，将g ++可执行文件输出到我的桌面，在桌面上放置一个名为“student_status.txt”的文件。该程序运行正常，它打开文件进行阅读。我不需要任何绝对的路径。我在OS X上。
首先确保您的文件名正确，符号，大小写等等，并且它与 / executable / 输出文件位于同一目录中。也许尝试替换
fileRead.open("./student_status.txt");
与
./注意 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<link rel="Stylesheet" type="text/css" href="css/smoothTouchScroll.css" />
<link rel="stylesheet" href="dist/jquery.rondell.css" type="text/css" media="all" title="Screen">
<script type="text/javascript" src="libs/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="libs/modernizr-2.0.6.min.js"> </script>
<script type="text/javascript" src="dist/jquery.rondell.js"></script>
<link rel="Stylesheet" type="text/css" href="css/smoothTouchScroll.css" />
<link rel="Stylesheet" type="text/css" href="css/style1.css" />
<style type="text/css">
#TouchScroller
{
position:relative;
width:auto;
height:auto;
}
#TouchScroller div.scrollableArea img
{
position: relative;
float: left;
padding: 0;
margin: 0;
width:100%;
height:50%;
}
</style>
<script src="js/jquery-ui-1.10.3.custom.min.js"></script>
<script src="js/jquery.kinetic.min.js"></script>
<script src="js/jquery.smoothTouchScroll.min.js"></script>
</head>
<body>
<div>
<sql:setDataSource var="webappDataSource"
driver="com.mysql.jdbc.Driver" url="jdbc:mysql://pshrivas-eni.cwgbkmxxzso1.ap-southeast-1.rds.amazonaws.com:3306/eni_support"
user="db_user" password="password123" />
<sql:query dataSource="${webappDataSource}"
sql="select imgid,count1 from carousel_three" var="result1" />
<div id="car1" class="carousel">
<div id="rondellCarousel" class="hidden">
<c:forEach var="row" items="${result1.rows}">
<img id="img" src="${pageContext.servletContext.contextPath }/Imagedb?id=${row.imgid}" />
</c:forEach>
</div>
</div>
</div>
<script type="text/javascript">
$(function() {
// Create a rondell with the 'carousel' preset and set an option
// to disable the rondell while the lightbox is displayed
$("#rondellCarousel").rondell({
preset: "carousel",
onAfterShift:function(idx){
// alert(idx);
itemLoadCallback: trigger(idx)
}
});
});
function trigger(idx, state)
{
//document.getElementById('TouchScroller').innerHTML=" ";
$.ajax({
type : "GET",
url : "Sampleimage1",
contentType :"application/json",
data:{id:idx},
success : function(data) {
$.each(data,function(index,item){
$.each(item,function(i,obj){
var img = $('<img id="dynamic">'); //Equivalent: $(document.createElement('img'))
img.attr('src','data:image/jpg;base64,' +obj.map.key );
img.appendTo('.scrollableArea');
// $('.scrollableArea').append('<img src="data:image/jpg;base64,' +obj.map.key+'" />');
});
});
}
});
}
</script>
<div id ="car2" class="carousel1">
<div id="TouchScroller">
</div>
</div>
<script>
$("#TouchScroller").smoothTouchScroll({
continuousScrolling: true
});
</script>
</body>
</html>
告诉程序查看当前目录。