CODEWITHSUNDEEP
c++filetext-filesfilepath
Jork449
Jork449

Reputation: 107

output filename from a different string

hi i am having a bit of trouble with this code

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
    string line;
    //const char* test = "connect";
    #define test "connect"
    string con("c:\\filepath\\%s.txt", test);
    ifstream file;
    file.open(con.c_str());
    if (file.is_open()) {
        while (file.good()) {
            getline(file, line);
            printf("setc %s\n", line.c_str());
            //cout << "setc " << line << endl;
        }
        file.close();
    } else
        cout << "Unable to open file";
    return 0;
}

could someone please tell me what i am going wrong

this is what i am after

'con' is meant to get its filename from 'test'

if you could help me i would appreciate it :)

Upvotes: 1

Views: 790

Answers (1)

Dietmar K&#252;hl
Dietmar K&#252;hl

Reputation: 153820

There are many ways to do this. Here are two:

std::string con1("c:\\filepath\\" test ".txt");
std::string con2("c:\\filepath\\" + std::string(test) + ".txt");

The initialization of con1 requires that test becomes a string literal through macro expansion as it relies on the merging of of string literals. The second form is more general and test can be anything which can be converted to a std::string, e.g., a char const*.

Upvotes: 3

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