配置文件保存在exe所在目录

浅浅的花香味﹌ 2022-06-03 02:18 172阅读 0赞

论坛题目：

一个C++程序，main函数中用ifstream打不开txt文件，我将sales\_data.txt文件存放在跟源码一样的目录下

\#include <iostream>  
\#include <string>  
\#include <fstream>  
\#include <sstream>  
using namespace std;  
  
class Sales\_data\{  
public:  
friend istream &read(istream &, Sales\_data &);//一个友元函数read,便于Sales\_data类直接访问  
friend ostream &print(ostream &os, const Sales\_data &item);  
Sales\_data() = default;//默认构造函数  
Sales\_data(const std::string &s) : bookNo(s)\{ \}  
Sales\_data(const std::string &s, unsigned n, double p) : bookNo(s), units\_sold(n), revenue(p\*n)\{ \}  
Sales\_data(std::istream &is)\{  
read(is, \*this);  
\}  
  
  
string isbn() const \{ return bookNo; \}  
Sales\_data& combine(const Sales\_data&);  
double avg\_price() const;  
  
private:  
string bookNo;  
unsigned units\_sold = 0;  
double revenue = 0.0;  
\};  
  
Sales\_data add(const Sales\_data&, const Sales\_data&);  
std::ostream &print(std::ostream&, const Sales\_data&);  
std::istream &read(std::istream&, Sales\_data&);  
  
double Sales\_data::avg\_price() const\{  
if (units\_sold)  
return revenue / units\_sold;  
else  
return 0;  
\}  
  
Sales\_data& Sales\_data::combine(const Sales\_data &rhs)  
\{  
units\_sold += rhs.units\_sold;  
revenue += rhs.revenue;  
return \*this;  
\}  
  
istream &read(istream &is, Sales\_data &item)  
\{  
double price = 0;  
is >> item.bookNo >> item.units\_sold >> price;  
item.revenue = price \* item.units\_sold;  
return is;  
\}  
  
ostream &print(ostream &os, const Sales\_data &item)\{  
os << item.isbn() << " " << item.units\_sold << " "  
<< item.revenue << " " << item.avg\_price();  
return os;  
\}  
  
Sales\_data add(const Sales\_data &lhs, const Sales\_data &rhs)\{  
Sales\_data sum = lhs;  
sum.combine(rhs);  
return sum;  
\}  
  
/\*  
Sales\_data::Sales\_data(std::istream &is)  
\{  
read(is,\*this);  
\}  
\*/  
  
int main()  
\{  
ifstream in("sales\_data.txt");// 为什么在这里打不开txt文件啊  
//改动地方，新增一个Sales\_data.txt  
Sales\_data total;  
if (read(in, total))  
\{  
//read(cin,total); 变为read(in,total);  
Sales\_data trans;  
while (read(in, trans))  
\{  
//read(cin, total); 变为read(in,total);  
if (total.isbn() == trans.isbn())  
total.combine(trans);  
else  
\{  
print(cout, total) << endl;  
total = trans;  
\}  
\}  
print(cout, total) << endl;  
\}  
else\{  
cerr << "No data?!" << endl;  
\}  
\}

更多[0][]

原因：如果不添加路径最好将配置文件保存在exe所在目录，调证调试路径，否则要放在解决方案或者工程文件所在的目录

[0]: http://bbs.csdn.net/topics/392295821#