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c:stdio.h:freopen [2024/02/16 01:05] (current) |
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+ | {{keywords>wiki library source code example reference}} | ||
+ | ====== freopen ====== | ||
+ | |||
+ | <code c> | ||
+ | #include <stdio.h> /* including standard library */ | ||
+ | //#include <windows.h> /* uncomment this for Windows */ | ||
+ | |||
+ | FILE *freopen( const char *fname, const char *mode, FILE *stream ); | ||
+ | </code> | ||
+ | closes file associated with stream, then opens file filename with specified mode and associates it with stream. Returns stream or NULL on error. | ||
+ | |||
+ | ===== C Sourcecode Example ===== | ||
+ | <code c> | ||
+ | /* | ||
+ | * freopen example code | ||
+ | * http://code-reference.com/c/stdio.h/freopen | ||
+ | */ | ||
+ | |||
+ | |||
+ | #include <stdio.h> /* including standard library */ | ||
+ | //#include <windows.h> /* uncomment this for Windows */ | ||
+ | |||
+ | |||
+ | int main ( void ) | ||
+ | { | ||
+ | freopen ("test.txt","w",stdout); | ||
+ | printf ("This content is written to a file"); | ||
+ | fclose (stdout); | ||
+ | return 0; | ||
+ | } | ||
+ | </code> | ||
+ | |||
+ | ==== freopen output example ==== | ||
+ | user@host:~$ ./freopen | ||
+ | user@host:~$ cat test.txt | ||
+ | This content is written to a file | ||
+ | |||