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c:stdio.h:perror [2024/02/16 01:05] (current) |
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+ | {{keywords>wiki library source code example reference}} | ||
+ | |||
+ | ====== perror ====== | ||
+ | <code c> | ||
+ | void perror(const char *str); | ||
+ | </code> | ||
+ | |||
+ | Prints str (if non-null) and strerror(errno) to standard error as would: | ||
+ | <code c> | ||
+ | fprintf(stderr, "%s: %s\n", (s != NULL ? s : ""), strerror(errno)) | ||
+ | </code> | ||
+ | ===== C Sourcecode Example ===== | ||
+ | <code c> | ||
+ | /* | ||
+ | * perror example code | ||
+ | * http://code-reference.com/c/stdio.h/perror | ||
+ | */ | ||
+ | |||
+ | #include <stdio.h> /* including standard library */ | ||
+ | //#include <windows.h> /* uncomment this for Windows */ | ||
+ | |||
+ | |||
+ | int main ( void ) | ||
+ | { | ||
+ | FILE *stream; | ||
+ | |||
+ | stream = fopen("test_not_exists.txt","r"); | ||
+ | |||
+ | if (stream == 0) { | ||
+ | perror("Here comes the perror code ->"); | ||
+ | return 1; | ||
+ | } | ||
+ | |||
+ | printf("its all fine\n"); | ||
+ | |||
+ | fclose (stream); | ||
+ | return 0; | ||
+ | |||
+ | } | ||
+ | </code> | ||
+ | |||
+ | === output === | ||
+ | ./perror | ||
+ | Here comes the perror code ->: No such file or directory | ||
+ | |||