beremiz

py_ext: fix CSV Writer

18 months ago, Edouard Tisserant
d2f5eb3c7d6e
py_ext: fix CSV Writer

fix POU logic :
- SAVE is a BOOL
- invocation of py_eval on rising edge of SAVE
- remove save python argument

fix python:
- use no encoding for file open (python2)
- re-use detected dialect if any
- use no "rt+" and truncate since no need to re-sniff dialect for output file
- return "OK" instead of "#SUCCESS", preventing POU logic to ACK result
- support creating new line if writing just after last line
- support appending data on short rows

fix example:
- use a HMI:Button to trigger CSV write instead of HMI:Input +1
- reload CSVs on on each new CSV opened in file browser
- add display of CSV write output
#define __Unpack_case_t(TYPENAME) \
case TYPENAME##_ENUM : \
if(flags) *flags = ((__IEC_##TYPENAME##_t *)varp)->flags; \
if(value_p) *value_p = &((__IEC_##TYPENAME##_t *)varp)->value; \
if(size) *size = sizeof(TYPENAME); \
break;
#define __Unpack_case_p(TYPENAME) \
case TYPENAME##_O_ENUM : \
case TYPENAME##_P_ENUM : \
if(flags) *flags = ((__IEC_##TYPENAME##_p *)varp)->flags; \
if(value_p) *value_p = ((__IEC_##TYPENAME##_p *)varp)->value; \
if(size) *size = sizeof(TYPENAME); \
break;
#define __Is_a_string(dsc) (dsc->type == STRING_ENUM) ||\
(dsc->type == STRING_P_ENUM) ||\
(dsc->type == STRING_O_ENUM)
static int UnpackVar(__Unpack_desc_type *dsc, void **value_p, char *flags, size_t *size)
{
void *varp = dsc->ptr;
/* find data to copy*/
switch(dsc->type){
__ANY(__Unpack_case_t)
__ANY(__Unpack_case_p)
default:
return 0; /* should never happen */
}
return 1;
}