ifstream() 从字符串变量中获取文件名的 C++ 问题

Question

I am having this simple yet annoying issue.

ifstream dataFile(fileName) works fine if fileName is hard-coded or assign via a string variable however when supplied from an argument, it is unable to find the file.

I have the following code -

//This function will get filenames from a .txt file
//Then call getDataFromFile() with filename as argument

void getFileNames(string dataFileName){

   string line;
   ifstream dataFile(dataFileName);
   if(!dataFile){
      cout << "Error! No such file found! Ending Program." << 
      endl;
      exit(0);
    }

    while(getline(dataFile,line)){
       if(!line.empty()){
           getDataFromFile(line);
       }
    }
} 

//**Issue is inside this function**

void getDataFromFile(string fileName){

   //Files are under "data/" path -
   //To access Jan.csv - "data/Jan.csv"

   string filePath = "data/Jan.csv"; //Works
   string filePath = "data/"+fileName; //Not working - Unable to find file   

   ifstream dataFile(filePath);
 //...Rest of code
}

Below is the content of .txt file

Jan.csv

Feb.csv

I have tried to pass the string as c string using

ifstream dataFile(filePath.c_str());

and still unable to find the file.

Answer 1

Found the issue. Filename is ending with "\\r".

For c++ newbies like me who are using codeblock -

You can check filename during run-time by setting breakpoints and check from the Debugger console.

1) Set breakpoints by clicking at the left side of the line that you want to check

2) Run the debugger by clicking the debug button at the top "the red color one".

3) Check via the debugger console