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# slow5_hdr_write
## NAME
slow5_hdr_write - writes the associated SLOW5 header to a SLOW5 file
## SYNOPSYS
`int slow5_hdr_write(slow5_file_t *s5p)`
## DESCRIPTION
`slow5_hdr_write()` writes the associated SLOW5 header to the SLOW5 file pointed by *s5p*. The associated SLOW5 header is the *s5p->header* member inside the *slow5_file_t \*s5p* returned by `slow5_open()`.
## RETURN VALUE
Upon successful completion, `slow5_hdr_write()` returns the number of bytes written. Otherwise, a negative value is returned.
## ERRORS
todo
## NOTES
In the future a error number will be set to indicate the error.
## EXAMPLES
```
#include <stdio.h>
#include <stdlib.h>
#include <slow5/slow5.h>
#define FILE_PATH "test.slow5"
int main(){
slow5_file_t *sp = slow5_open(FILE_PATH, "w");
if(sp==NULL){
fprintf(stderr,"Error opening file!\n");
exit(EXIT_FAILURE);
}
slow5_hdr_t* header = sp->header;
//add a header group attribute called run_id
if (slow5_hdr_add("run_id", header) != 0){
fprintf(stderr,"Error adding run_id attribute\n");
exit(EXIT_FAILURE);
}
//set the run_id attribute to "run_0" for read group 0
if (slow5_hdr_set("run_id", "run_0", 0, header) != 0){
fprintf(stderr,"Error setting run_id attribute in read group 0\n");
exit(EXIT_FAILURE);
}
//add auxilliary field: channel number
if (slow5_aux_add("channel_number", SLOW5_STRING, sp->header) < 0){
fprintf(stderr,"Error adding channel_number auxilliary field\n");
exit(EXIT_FAILURE);
}
if(slow5_hdr_write(sp) < 0){
fprintf(stderr,"Error writing header!\n");
exit(EXIT_FAILURE);
}
slow5_close(sp);
return 0;
}
```
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