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c:stdio.h:fseek

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c:stdio.h:fseek [2013/01/22 22:02] (current)
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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|]]
  
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c/stdio.h/fseek.txt · Last modified: 2013/01/22 22:02 (external edit)

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