c:stdio.h:fseek
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| + | {{keywords>wiki library source code example reference}} | ||
| + | ====== fseek ====== | ||
| + | |||
| + | <code c> | ||
| + | int fseek(FILE *stream, long int offset, int origin); | ||
| + | </code> | ||
| + | |||
| + | Sets file position for stream stream and clears end-of-file indicator. For a binary stream, file position is set to offset bytes from the position indicated by origin: beginning of file for SEEK_SET, current position for SEEK_CUR, or end of file for SEEK_END. Behaviour is similar for a text stream, but offset must be zero or, for SEEK_SET only, a value returned by ftell. Returns non-zero on error. | ||
| + | |||
| + | ===== C Sourcecode Example ===== | ||
| + | <code c> | ||
| + | #include <stdio.h> /* including standard library */ | ||
| + | //#include <windows.h> /* uncomment this for Windows */ | ||
| + | |||
| + | |||
| + | int main (void) { | ||
| + | FILE *stream; | ||
| + | int c; | ||
| + | long seek_position; | ||
| + | |||
| + | seek_position = 21; | ||
| + | |||
| + | stream=fopen("test.txt", "r" ); | ||
| + | if (stream == 0) { | ||
| + | perror("cannot open file"); | ||
| + | return 0; | ||
| + | } | ||
| + | |||
| + | fseek(stream, 0L, SEEK_SET); | ||
| + | while( (c=getc(stream)) != EOF) { | ||
| + | putc(c, stdout); | ||
| + | } | ||
| + | |||
| + | /* SET SEEK CUR to 20 char of the file */ | ||
| + | fseek(stream, 0L, SEEK_SET); | ||
| + | fseek(stream, seek_position, SEEK_CUR ); | ||
| + | |||
| + | while( (c=getc(stream)) != EOF) { | ||
| + | putc(c, stdout); | ||
| + | } | ||
| + | |||
| + | return 0; | ||
| + | |||
| + | } | ||
| + | </code> | ||
| + | |||
| + | |||
| + | === content of test.txt === | ||
| + | <code c> | ||
| + | TEst 1234 iam a test file for code-reference.com just write your code down ;) | ||
| + | </code> | ||
| + | |||
| + | ==== output ==== | ||
| + | output: ./fseek | ||
| + | TEst 1234 iam a test file for code-reference.com just write your code down ;) | ||
| + | file for code-reference.com just write your code down ;) | ||
| + | |||
| + | |||
| + | see also [[c:stdio.h:rewind|]] | ||
on the occasion of the current invasion of Russia in Ukraine
c/stdio.h/fseek.txt · Last modified: 2024/02/16 01:05 (external edit)
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