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# slow5_idx_load
## NAME
slow5_idx_load - loads the index file for a SLOW5 file
## SYNOPSYS
`int slow5_idx_load(slow5_file_t *s5p)`
## DESCRIPTION
`slow5_idx_load()` loads an index file for a SLOW5 file pointed by *s5p* into the memory from the disk and associates the index with *s5p*. If the index file is not found, the index is first created and written to the disk.
`slow5_idx_load()` should be called successfully before using `slow5_get()`.
## RETURN VALUE
Upon successful completion, `slow5_idx_load()` returns a non-negative integer. Otherwise, a negative value is returned.
## NOTES
`slow5_errno` will be set in future to indicate the type of error that occurred.
## EXAMPLES
```
#include <stdio.h>
#include <stdlib.h>
#include <slow5/slow5.h>
#define FILE_PATH "examples/example.slow5"
int main(){
slow5_file_t *sp = slow5_open(FILE_PATH,"r");
if(sp==NULL){
fprintf(stderr,"Error in opening file\n");
exit(EXIT_FAILURE);
}
int ret=0;
ret = slow5_idx_load(sp);
if(ret<0){
fprintf(stderr,"Error in loading index\n");
exit(EXIT_FAILURE);
}
//...
slow5_idx_unload(sp);
slow5_close(sp);
}
```
## SEE ALSO
[slow5_idx_create()](slow5_idx_create.md), [slow5_idx_unload()](slow5_idx_unload.md)
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