1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
#include <iostream>
#include <fstream>
using namespace std;
int main(int argc, char **argv)
{
ofstream errlog; // 1
streambuf *cerr_buffer = 0; // 2
if (argc == 2)
{
errlog.open(argv[1]); // 3
cerr_buffer = cerr.rdbuf(errlog.rdbuf()); // 4
}
else
{
cerr << "Missing log filename\n";
return 1;
}
cerr << "Several messages to stderr, msg 1\n";
cerr << "Several messages to stderr, msg 2\n";
cout << "Now inspect the contents of " <<
argv[1] << "... [Enter] ";
cin.get(); // 5
cerr << "Several messages to stderr, msg 3\n";
cerr.rdbuf(cerr_buffer); // 6
cerr << "Done\n"; // 7
}
/*
Generated output on file argv[1]
at cin.get():
Several messages to stderr, msg 1
Several messages to stderr, msg 2
at the end of the program:
Several messages to stderr, msg 1
Several messages to stderr, msg 2
Several messages to stderr, msg 3
*/
|
