R6010 abort() has been called - c++

Question

I read about substr from here
http://www.cplusplus.com/reference/string/string/substr/
Here is my code :
int main()
{
std::ifstream in ("c:\\users\\admin\\desktop\\aaa.txt");
std::ofstream out ("c:\\users\\admin\\desktop\\bbb.txt");
std::string s ;
while ( getline (in,s) )
{
std::size_t startpos = s.find("test");
std::string str = s.substr (startpos);
out << str << endl;
}
in.close();
out.close();
}
I get error : R6010 abort() has been called
Note : aaa.txt contains spaces/characters/html tags
Any idea ?

Answer 1

Since I dont know the content of the text file, could you try making the following changes and let me know if the error is still being shown:
#include <fstream>
#include <iostream>
#include <sstream>
using namespace std;
int main()
{
ifstream in("example.txt");
ofstream out("bbb.txt");
string s = std::string();
string str = std::string();
while (getline(in, s))
{
size_t startpos = s.find("test");
cout << s;
if (startpos != std::string::npos){
str = s.substr(startpos);
out << str << endl;
}
}
in.close();
out.close();
getchar();
return 0;
}
I am using if (startpos != std::string::npos) condition to check what to do when the find succeeds, this is missing in your code. adding this case will resolve your error.
Keep coding :)

Answer 2

While Code Frenzy answer is right, you can also use exceptions to help catch these kind of errors:
#include <fstream>
#include <iostream>
#include <sstream>
using namespace std;
int main()
{
std::ifstream in ("aaa.txt");
std::ofstream out ("bbb.txt");
std::string s ;
try
{
while ( getline (in,s) )
{
std::size_t startpos = s.find("test");
std::string str = s.substr (startpos);
out << str << endl;
}
in.close();
out.close();
}
catch(std::exception e)
{
// (1) it will catch the error show show
cerr << e.what() << endl;
}
catch(std::out_of_range e)
{
// (2) this will also catch the same error if (1) was not there but could
// get you more details if you wanted since its more specific but i have
// not digged into it further
cerr << e.what() << endl;
}
catch(...)
{
// (3) just for sanity check if first two didn't catch it
cerr << "something went wrong";
}
}
The exceptoin catches this error and prints the message:
invalid string position