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Third Party CJSON
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65de016c
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Third Party CJSON
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体验新版 GitCode,发现更多精彩内容 >>
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65de016c
编写于
8月 22, 2011
作者:
K
Kevin Branigan
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a few more README changes
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65de016c
...
...
@@ -77,7 +77,7 @@ Want to change the framerate?
Back to disk?
char * rendered
=
cJSON_Print(root);
char * rendered
=
cJSON_Print(root);
Finished? Delete the root (this takes care of everything else).
...
...
@@ -89,12 +89,12 @@ before you dereference them. If you want to see how you'd build this struct in c
cJSON *root,*fmt;
root = cJSON_CreateObject();
cJSON_AddItemToObject(root, "name", cJSON_CreateString("Jack (\"Bee\") Nimble"));
cJSON_AddItemToObject(root, "format", fmt
=
cJSON_CreateObject());
cJSON_AddStringToObject(fmt,"type", "rect");
cJSON_AddNumberToObject(fmt,"width", 1920);
cJSON_AddNumberToObject(fmt,"height", 1080);
cJSON_AddFalseToObject (fmt,"interlace");
cJSON_AddNumberToObject(fmt,"frame rate", 24);
cJSON_AddItemToObject(root, "format", fmt
=
cJSON_CreateObject());
cJSON_AddStringToObject(fmt,
"type", "rect");
cJSON_AddNumberToObject(fmt,
"width", 1920);
cJSON_AddNumberToObject(fmt,
"height", 1080);
cJSON_AddFalseToObject (fmt,
"interlace");
cJSON_AddNumberToObject(fmt,
"frame rate", 24);
Hopefully we can agree that's not a lot of code? There's no overhead, no unnecessary setup.
Look at test.c for a bunch of nice examples, mostly all ripped off the json.org site, and
...
...
@@ -156,11 +156,11 @@ you'd do it (just an example, since these things are very specific):
{
while (item)
{
char *newprefix
=malloc(strlen(prefix)+strlen(item->name)+
2);
char *newprefix
= malloc(strlen(prefix) + strlen(item->name) +
2);
sprintf(newprefix,"%s/%s",prefix,item->name);
int dorecurse
=
callback(newprefix, item->type, item);
if (item->child && dorecurse) parse_and_callback(item->child,newprefix);
item
=
item->next;
int dorecurse
=
callback(newprefix, item->type, item);
if (item->child && dorecurse) parse_and_callback(item->child,
newprefix);
item
=
item->next;
free(newprefix);
}
}
...
...
@@ -185,24 +185,25 @@ You'd use:
void parse_object(cJSON *item)
{
int i; for (i=0;i<cJSON_GetArraySize(item);i++)
int i;
for (i = 0 ; i < cJSON_GetArraySize(item) ; i++)
{
cJSON *
subitem=cJSON_GetArrayItem(item,
i);
cJSON *
subitem = cJSON_GetArrayItem(item,
i);
// handle subitem.
}
}
Or, for PROPER manual mode:
void parse_object(cJSON *item)
void parse_object(cJSON *
item)
{
cJSON *subitem
=
item->child;
cJSON *subitem
=
item->child;
while (subitem)
{
// handle subitem
if (subitem->child) parse_object(subitem->child);
subitem
=
subitem->next;
subitem
=
subitem->next;
}
}
...
...
@@ -217,21 +218,22 @@ You can, of course, hand your sub-objects to other functions to populate.
Also, if you find a use for it, you can manually build the objects.
For instance, suppose you wanted to build an array of objects?
cJSON *objects[24];
cJSON *
objects[24];
cJSON *
Create_array_of_anything(cJSON **items,
int num)
cJSON *
Create_array_of_anything(cJSON ** items,
int num)
{
int i;cJSON *prev, *root=cJSON_CreateArray();
for (i=0;i<24;i++)
int i;
cJSON * prev, * root = cJSON_CreateArray();
for (i = 0 ; i < 24 ; i++)
{
if (!i)
root->child=
objects[i];
else
prev->next=objects[i], objects[i]->prev=
prev;
prev
=
objects[i];
if (!i)
root->child =
objects[i];
else
prev->next = objects[i], objects[i]->prev =
prev;
prev
=
objects[i];
}
return root;
}
and simply: Create_array_of_anything(objects,24);
and simply: Create_array_of_anything(objects,
24);
cJSON doesn't make any assumptions about what order you create things in.
You can attach the objects, as above, and later add children to each
...
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