Hi,
Where has output-to-cout gone in the program below?
Thanks,
========= C++ code : File foo.cpp : BEGIN ========= #include <cstdio> #include <cassert> #include <iostream> #include <fstream> using namespace std;
#define FILE_NAME "foobar"
int main () { ofstream ofs;
remove (FILE_NAME);
ofs.open (FILE_NAME); assert (ofs); assert (ofs.is_open());
FILE* stdof = freopen (FILE_NAME, "w", stdout);
This call to freopen closes stdout, therefore you cannot print anything using cout after this point.
assert (stdof);
cout << "to cout (first time)" << endl; // Problematic line ofs << "to ofs (first time)" << endl; cout << "to cout (second time)" << endl; // Problematic line ofs << "to ofs (second time)" << endl;
ofs.close(); assert (!ofs.is_open());
int rc = fclose (stdof); assert (!rc);
return 0; } ========= C++ code : File foo.cpp : END ===========
========= Compilation & Run : BEGIN =========
$ g++ -v [---omitted---] gcc version 3.3.1 (cygming special)
$ g++ -W -Wall foo.cpp
$ a // No output; Where has output-to-cout gone?
$ cat foobar to ofs (first time) to ofs (second time)
========= Compilation & Run : END ===========
-- ===================================== Alex Vinokur mailto:alexvn@xxxxxxxxxx http://up.to/alexvn =====================================
