cJSON公式テストプログラム詳細
7301 ワード
これはcJSONが公式に提供したテスト小demoで、比較的読みやすいです.主な役割は、メモリ内のデータをjson形式のデータに変換し、json形式のデータを文字列に変換して画面やファイルに出力することです.
#include
#include
#include "cJSON.h"
/* Parse text to JSON, then render back to text, and print! */
/* json ， json */
void doit(char *text)
{
char *out;cJSON *json;
json=cJSON_Parse(text); // cJSON
if (!json) {printf("Error before: [%s]
",cJSON_GetErrorPtr());} //
else
{
out=cJSON_Print(json); // cJSON
cJSON_Delete(json); //
printf("%s
",out); //
free(out); //
}
}
/* Read a file, parse, render back, etc. */
/* ， json ， */
void dofile(char *filename)
{
FILE *f;long len;char *data;
f=fopen(filename,"rb");fseek(f,0,SEEK_END);len=ftell(f);fseek(f,0,SEEK_SET); //
data=(char*)malloc(len+1);fread(data,1,len,f);fclose(f); // data
doit(data);
free(data);
}
/* Used by some code below as an example datatype. */
/* */
struct record {const char *precision;double lat,lon;const char *address,*city,*state,*zip,*country; };
/* Create a bunch of objects as demonstration. */
void create_objects()
{
cJSON *root,*fmt,*img,*thm,*fld;char *out;int i; /* declare a few. */
/* Our "days of the week" array: */
const char *strings[7]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
/* Our matrix: */
int numbers[3][3]={{0,-1,0},{1,0,0},{0,0,1}};
/* Our "gallery" item: */
int ids[4]={116,943,234,38793};
/* Our array of "records": */
struct record fields[2]={
{"zip",37.7668,-1.223959e+2,"","SAN FRANCISCO","CA","94107","US"},
{"zip",37.371991,-1.22026e+2,"","SUNNYVALE","CA","94085","US"}};
/* Here we construct some JSON standards, from the JSON site. */
/* Our "Video" datatype: */
root=cJSON_CreateObject(); // cJSON
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);
out=cJSON_Print(root); cJSON_Delete(root); printf("%s
",out); free(out); /* Print to text, Delete the cJSON, print it, release the string. */
/* Our "days of the week" array: */
root=cJSON_CreateStringArray(strings,7);
out=cJSON_Print(root); cJSON_Delete(root); printf("%s
",out); free(out);
/* Our matrix: */
root=cJSON_CreateArray();
for (i=0;i<3;i++) cJSON_AddItemToArray(root,cJSON_CreateIntArray(numbers[i],3));
/* cJSON_ReplaceItemInArray(root,1,cJSON_CreateString("Replacement")); */
out=cJSON_Print(root); cJSON_Delete(root); printf("%s
",out); free(out);
/* Our "gallery" item: */
root=cJSON_CreateObject();
cJSON_AddItemToObject(root, "Image", img=cJSON_CreateObject());
cJSON_AddNumberToObject(img,"Width",800);
cJSON_AddNumberToObject(img,"Height",600);
cJSON_AddStringToObject(img,"Title","View from 15th Floor");
cJSON_AddItemToObject(img, "Thumbnail", thm=cJSON_CreateObject());
cJSON_AddStringToObject(thm, "Url", "http:/*www.example.com/image/481989943");
cJSON_AddNumberToObject(thm,"Height",125);
cJSON_AddStringToObject(thm,"Width","100");
cJSON_AddItemToObject(img,"IDs", cJSON_CreateIntArray(ids,4));
out=cJSON_Print(root); cJSON_Delete(root); printf("%s
",out); free(out);
/* Our array of "records": */
root=cJSON_CreateArray();
for (i=0;i<2;i++)
{
cJSON_AddItemToArray(root,fld=cJSON_CreateObject());
cJSON_AddStringToObject(fld, "precision", fields[i].precision);
cJSON_AddNumberToObject(fld, "Latitude", fields[i].lat);
cJSON_AddNumberToObject(fld, "Longitude", fields[i].lon);
cJSON_AddStringToObject(fld, "Address", fields[i].address);
cJSON_AddStringToObject(fld, "City", fields[i].city);
cJSON_AddStringToObject(fld, "State", fields[i].state);
cJSON_AddStringToObject(fld, "Zip", fields[i].zip);
cJSON_AddStringToObject(fld, "Country", fields[i].country);
}
/* cJSON_ReplaceItemInObject(cJSON_GetArrayItem(root,1),"City",cJSON_CreateIntArray(ids,4)); */
out=cJSON_Print(root); cJSON_Delete(root); printf("%s
",out); free(out);
}
int main (int argc, const char * argv[]) {
/* a bunch of json: */
char text1[]="{
\"name\": \"Jack (\\\"Bee\\\") Nimble\",
\"format\": {\"type\": \"rect\",
\"width\": 1920,
\"height\": 1080,
\"interlace\": false,\"frame rate\": 24
}
}";
char text2[]="[\"Sunday\", \"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\"]";
char text3[]="[
[0, -1, 0],
[1, 0, 0],
[0, 0, 1]
]
";
char text4[]="{
\"Image\": {
\"Width\": 800,
\"Height\": 600,
\"Title\": \"View from 15th Floor\",
\"Thumbnail\": {
\"Url\": \"http:/*www.example.com/image/481989943\",
\"Height\": 125,
\"Width\": \"100\"
},
\"IDs\": [116, 943, 234, 38793]
}
}";
char text5[]="[
{
\"precision\": \"zip\",
\"Latitude\": 37.7668,
\"Longitude\": -122.3959,
\"Address\": \"\",
\"City\": \"SAN FRANCISCO\",
\"State\": \"CA\",
\"Zip\": \"94107\",
\"Country\": \"US\"
},
{
\"precision\": \"zip\",
\"Latitude\": 37.371991,
\"Longitude\": -122.026020,
\"Address\": \"\",
\"City\": \"SUNNYVALE\",
\"State\": \"CA\",
\"Zip\": \"94085\",
\"Country\": \"US\"
}
]";
/* Process each json textblock by parsing, then rebuilding: */
doit(text1);
doit(text2);
doit(text3);
doit(text4);
doit(text5);
/* Parse standard testfiles: */
/* dofile("../../tests/test1"); */
/* dofile("../../tests/test2"); */
/* dofile("../../tests/test3"); */
/* dofile("../../tests/test4"); */
/* dofile("../../tests/test5"); */
/* Now some samplecode for building objects concisely: */
create_objects();
return 0;
}