saving files in c++ at different full paths

Question

I am writing a program in C++ which I need to save some .txt files to different locations as per the counter variable in program what should be the code? Please help

I know how to save file using full path

ofstream f;
f.open("c:\\user\\Desktop\\**data1**\\example.txt");
f.close();

I want "c:\user\Desktop\data*[CTR]*\filedata.txt"

But here the data1,data2,data3 .... and so on have to be accessed by me and create a textfile in each so what is the code? Counter variable "ctr" is already evaluated in my program.

http://stackoverflow.com/questions/191757/c-concatenate-string-and-int — Azodious, Dec 16 '11 at 05:47

score 2 · Answer 1 · answered Dec 16 '11 at 05:46

2

You could snprintf to create a custom string. An example is this:

char filepath[100];
snprintf(filepath, 100, "c:\\user\\Desktop\\data%d\\example.txt", datanum);

Then whatever you want to do with it:

ofstream f;
f.open(filepath);
f.close();

Note: snprintf limits the maximum number of characters that can be written on your buffer (filepath). This is very useful for when the arguments of *printf are strings (that is, using %s) to avoid buffer overflow. In the case of this example, where the argument is a number (%d), it is already known that it cannot have more than 10 characters and so the resulting string's length already has an upper bound and just making the filepath buffer big enough is sufficient. That is, in this special case, sprintf could be used instead of snprintf.

answered Dec 16 '11 at 05:46

Shahbaz

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well thanks for the answer u solved my problem 99% but it stops working for even just 8 loops .R u getting me... – KB2807 Dec 16 '11 at 06:43
@KB807 this code should work. If it stops after 8, that's your code, not this – Mooing Duck Dec 16 '11 at 07:06
@KB2807, don't be shy to accept the answer if it solved your problem ;) – Shahbaz Dec 16 '11 at 07:53

score 2 · Answer 2 · answered Dec 16 '11 at 05:56

You can use the standard string streams, such as:

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

void f ( int data1 )
{
     ostringstream path;
     path << "c:\\user\\Desktop\\" << data1 << "\\example.txt";
     ofstream file(path.str().c_str());
     if (!file.is_open()) { 
          // handle error.
     }
     // write contents...
}

saving files in c++ at different full paths

2 Answers2