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[英]Microsoft C++ exception: std::out_of_range at memory location
[英]std::out_of_range at memory location error at getline
我對C ++很陌生,這里有很多代碼,所以我將盡我所能將其壓縮到問題區域。 當我嘗試使用getline獲取用戶輸入時,出現此錯誤。 由於我不希望文件名中有空格(我制作了文件),因此我使用cin <<可以正常工作,但是在嘗試讀取文件時出現了相同的錯誤。 代碼如下
// includes here
using namespace std;
//other prototypes here
string getUserDataFromFile(vector<int>&, int&, string);
int main()
{
vector<int> numbers;
numbers.reserve(50);
int numberOfElements = 0;
int number = 0;
int numToFind = 0;
int numberPosition = -1;
int useFile = 0;
string filename = "";
string fileReadMessage = "";
string output = "";
string outFilename = "";
cout << "Would you like to load the data from a file?(1 for yes 0 for no)";
cin >> useFile;
cin.ignore(INT_MAX, '\n');
//get user data for manual input
if(useFile == 0)
{
//code here for manual input(works fine)...
}
//get userdata for file input
else
{
cout << "Please Enter the file path to be opened" << endl;
//fixed after adding cin.ignore(INT_MAX, '\n');
//see next function for another problem
getline(cin, filename);
fileReadMessage = getUserDataFromFile(numbers, numToFind, filename);
}
//some code to get data for output
return 0;
}
//function to get user data from file
//@param v(vector<int>&) - vector of integers.
//@param numToFind(int&) - the number we are looking for
//@param filename(string) - the filename of the file with data
//@return message(string) - a message containing errors or success.
string getUserDataFromFile(vector<int>& v, int& numToFind, string filename)
{
string message = "File Accepted";
string line = "";
int numOfElements = 0;
int count = 0;
ifstream fileToRead(filename.c_str());
//using 'cin >>' in main, the program runs till here then breaks
//if message is a file, extract message from file
if (fileToRead.is_open())
{
while (getline(fileToRead,line))
{
//code to do stuff with file contents here
}
fileToRead.close();
}
else
{
message = "Unable to open file.";
}
return message;
}
我在出現問題的地方留下了一些評論,並遺漏了我沒有遇到問題或無法測試的大多數代碼。 任何幫助表示贊賞。 謝謝!
所以我的第一個問題是通過添加cin.ignore(INT_MAX,'\\ n');來解決的。 對下一個問題有任何猜測嗎? 在下一函數if(fileToRead.is_open())所在的行
加
cin.ignore();
之前:
getline(cin, filename);
否則,您輸入useFile
后鍵入的useFile
將被讀入filename
。
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