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c:stdio.h:ftell [2013/01/22 22:02] |
c:stdio.h:ftell [2024/02/16 01:05] (current) |
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+ | {{keywords>wiki library source code example reference}} | ||
+ | ===== ftell ===== | ||
+ | |||
+ | <code c> | ||
+ | long int ftell(FILE *stream); | ||
+ | </code> | ||
+ | Returns current file position for stream stream, or -1 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; | ||
+ | |||
+ | if((stream=fopen("test.txt","r"))==NULL) { | ||
+ | printf("Cannot open file.\n"); | ||
+ | return 1; | ||
+ | } | ||
+ | |||
+ | while((c = fgetc(stream) ) != EOF) { | ||
+ | printf("position of pointer in the stream is %i on character %c\n", ftell(stream), c); | ||
+ | } | ||
+ | fclose(stream); | ||
+ | return 0; | ||
+ | } | ||
+ | </code> | ||
+ | |||
+ | === content of test.txt === | ||
+ | |||
+ | <code c> | ||
+ | Test 1234 | ||
+ | </code> | ||
+ | |||
+ | ==== output ==== | ||
+ | output: ./ftell | ||
+ | position of pointer in the stream is 1 on character T | ||
+ | position of pointer in the stream is 2 on character E | ||
+ | position of pointer in the stream is 3 on character s | ||
+ | position of pointer in the stream is 4 on character t | ||
+ | position of pointer in the stream is 5 on character | ||
+ | position of pointer in the stream is 6 on character 1 | ||
+ | position of pointer in the stream is 7 on character 2 | ||
+ | position of pointer in the stream is 8 on character 3 | ||
+ | position of pointer in the stream is 9 on character 4 | ||