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# slow5lib
## NAME
slow5_open_with - Opens a slow5 file of a specific format with a mode given it's pathname.
## SYNOPSYS
`slow5_file_t *slow5_open_with(const char *pathname, const char *mode, enum slow5_fmt format)`
## DESCRIPTION
This function at the moment should only be used to open a file for reading. The user is expected to give `r` or `rb` as the *mode* for ASCII and binary respectively along with the correct *format*.
An open slow5 file should be closed using `slow5_close()`
## RETURN VALUE
Upon successful completion, `slow5_open_with()` returns a *slow5_file_t* pointer. Otherwise, NULL is returned, e.g., if *pathname* or *mode* is NULL, or if the *format* specified doesn't match the file format.
## NOTES
This function at the moment should only be used to open a file for reading. The user is expected to give `r` or `rb` as the *mode* for ASCII and binary respectively.
`slow5_open_with(pathname, mode, SLOW5_FORMAT_UNKNOWN)` is equivalent to `slow5_open(pathname, mode)`.
Also see [`slow5_open()`](../slow5_open.md)
## EXAMPLES
```
#include <stdio.h>
#include <stdlib.h>
#include <slow5/slow5.h>
#define FILE_PATH "examples/example.slow5"
#define TO_PICOAMPS(RAW_VAL,DIGITISATION,OFFSET,RANGE) (((RAW_VAL)+(OFFSET))*((RANGE)/(DIGITISATION)))
int main(){
slow5_file_t *sp = slow5_open_with(FILE_PATH,"r",SLOW5_FORMAT_ASCII);
if(sp==NULL){
fprintf(stderr,"Error in opening file\n");
exit(EXIT_FAILURE);
}
slow5_rec_t *rec = NULL;
int ret=0;
ret = slow5_idx_load(sp);
if(ret<0){
fprintf(stderr,"Error in loading index\n");
exit(EXIT_FAILURE);
}
ret = slow5_get("r3", &rec, sp);
if(ret < 0){
fprintf(stderr,"Error in locating read\n");
}
else{
printf("%s\t",rec->read_id);
uint64_t len_raw_signal = rec->len_raw_signal;
for(uint64_t i=0;i<len_raw_signal;i++){
double pA = TO_PICOAMPS(rec->raw_signal[i],rec->digitisation,rec->offset,rec->range);
printf("%f ",pA);
}
printf("\n");
}
slow5_rec_free(rec);
slow5_idx_unload(sp);
slow5_close(sp);
}
```
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