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Libxml2/Libxml2-xmlListCreate

Parmi les nombreuses fonctions de libxml2, se trouve une interface de gestion de liste.
Ci dessous, un exemple d'implémentation

#include <libxml/list.h>
#include <stdio.h>
#include <malloc.h>

struct Record {
int value;
float val;
} ;

int
walker(const char *data, const void *user)
{
struct Record *element = (struct Record*)data;
printf("%i,%f\n", element->value,element->val);
return (1);
}

static void release(xmlLinkPtr lk){

struct Record* el1 =(struct Record*)xmlLinkGetData(lk);
free(el1);

}

void main(){

struct Record* el1;

int i;
xmlListPtr list;
list = xmlListCreate((xmlListDeallocator)release, NULL);

el1=(struct Record*)malloc(sizeof(struct Record));

el1->val=10.0;
el1->value=10;
xmlListInsert(list,el1);

el1=(struct Record*)malloc(sizeof(struct Record));
el1->val=11.0;
el1->value=11;
xmlListInsert(list,el1);

i = xmlListSize(list);
printf("xmlListSize:%i\r\n",i);
xmlListWalk(list, (xmlListWalker)walker, NULL);

el1 =(struct Record*)xmlLinkGetData(xmlListEnd(list));

xmlListSearch(list,el1);

xmlListWalk(list, (xmlListWalker)walker, NULL);

xmlListClear(list);

}

pour une liste chaînée avec mémorisation de la dernière valeur ajoutée, dans cet exemple la valeur de l'élément test2 est initialement fixée à 2 pour être finalement remplacée par 3.

#include <libxml/list.h>
#include <stdio.h>
#include <malloc.h>
#include <string.h>

struct Record {
int value;
char name[6];
} ;

int
walker(const char *data, const void *user)
{
struct Record *record = (struct Record*)data;
printf("%s,%i\n",record->name, record->value);
return (1);
}

static void release(xmlLinkPtr lk){

struct Record* record =(struct Record*)xmlLinkGetData(lk);
free(record);

}

static int comp(const struct Record* data0, const struct Record* data1){

return stricmp(data0->name,data1->name);
}

void main(){

struct Record* el1;

int i;
xmlListPtr list;
list = xmlListCreate((xmlListDeallocator)release, (xmlListDataCompare)comp);

el1=(struct Record*)malloc(sizeof(struct Record));

el1->value=1;
strcpy(el1->name,"test1");
xmlListInsert(list,el1);

el1=(struct Record*)malloc(sizeof(struct Record));
el1->value=2;
strcpy(el1->name,"test2");
xmlListInsert(list,el1);

el1=(struct Record*)malloc(sizeof(struct Record));
strcpy(el1->name,"test2");
el1->value=3;
if(xmlListSearch(list,el1) == NULL)
xmlListInsert(list,el1);
else{
xmlListRemoveAll(list,el1);
xmlListInsert(list,el1);
}

i = xmlListSize(list);
printf("xmlListSize:%i\r\n",i);
xmlListWalk(list, (xmlListWalker)walker, NULL);
xmlListClear(list);

}