純C 存取JSON(使用cJSON函式庫) – jashliao部落格

#include

#include

#include

#include “cJSON.h”

char * create1()

{

    
cJSON *root,*dir1,*dir2,*dir3;

    
char *out;

    
//
創建json陣列型結構體

    
root = cJSON_CreateArray();

    
//
為陣列添加物件

    
cJSON_AddItemToArray(root,dir1=cJSON_CreateObject());

    
//
為物件添加字串鍵值對

    
cJSON_AddStringToObject(dir1,”name”,”.”);

    
cJSON_AddStringToObject(dir1,”path”,”uploads/”);

    
cJSON_AddStringToObject(dir1,”flag”,”true”);

    
cJSON_AddItemToArray(root,dir2=cJSON_CreateObject());

    
cJSON_AddStringToObject(dir2,”name”,”..”);

    
cJSON_AddStringToObject(dir2,”path”,”uploads”);

    
cJSON_AddStringToObject(dir2,”flag”,”true”);

    
cJSON_AddItemToArray(root,dir3=cJSON_CreateObject());

    
cJSON_AddStringToObject(dir3,”name”,”wang.txt”);

    
cJSON_AddStringToObject(dir3,”path”,”uploads/wang.txt”);

    
cJSON_AddStringToObject(dir3,”flag”,”false”);

    
//
將json結構體轉換為字串

    
out=cJSON_Print(root);

    
//
刪除

    
cJSON_Delete(root);

    
return out;

}

char * create2()

{

    
cJSON *root,*dir,*subdir,*dir1,*dir2,*dir3;

    
char *out;

    
root=cJSON_CreateObject();

    
cJSON_AddItemToObject(root,”Root”,dir=cJSON_CreateObject());

    
cJSON_AddStringToObject(dir,”name”,”/”);

    
cJSON_AddStringToObject(dir,”path”,”/”);

    
cJSON_AddStringToObject(dir,”flag”,”true”);

    
cJSON_AddItemToObject(root,”Child”,subdir =
cJSON_CreateArray());

    
cJSON_AddItemToObject(subdir,”dira”,dir1=cJSON_CreateObject());

    
cJSON_AddStringToObject(dir1,”name”,”.”);

    
cJSON_AddStringToObject(dir1,”path”,”/./”);

    
cJSON_AddStringToObject(dir1,”flag”,”true”);

    
cJSON_AddItemToObject(subdir,”dira”,dir2=cJSON_CreateObject());

    
cJSON_AddStringToObject(dir2,”name”,”..”);

    
cJSON_AddStringToObject(dir2,”path”,”/../”);

    
cJSON_AddStringToObject(dir2,”flag”,”true”);

    
cJSON_AddItemToObject(subdir,”dira”,dir3=cJSON_CreateObject());

    
cJSON_AddStringToObject(dir3,”name”,”uploads”);

    
cJSON_AddStringToObject(dir3,”path”,”/uploads/”);

    
cJSON_AddStringToObject(dir3,”flag”,”true”);

    
out=cJSON_Print(root);

    
cJSON_Delete(root);

    
return out;

}

char * create3()

{

    
cJSON *root,*img,*thm;

    
char *out;

    
int nums[4]={100,200,300,400};

    
root=cJSON_CreateObject();

    
cJSON_AddItemToObject(root, “Root”,
img=cJSON_CreateObject());

    
cJSON_AddNumberToObject(img,”key”,800);

    
cJSON_AddNumberToObject(img,”value”,600);

    
cJSON_AddStringToObject(img,”Title”,”Sugon”);

    
cJSON_AddItemToObject(img,”child”,thm=cJSON_CreateObject());

    
cJSON_AddNumberToObject(thm,”key”,125);

    
cJSON_AddStringToObject(thm,”value”,”100″);

        
cJSON_AddStringToObject(thm,”Url”,”www.sugon.com”);

    
cJSON_AddItemToObject(img,”nums”,
cJSON_CreateIntArray(nums,4));

    
out=cJSON_Print(root);

    
cJSON_Delete(root);

    
return out;

}

char * create4()

{

    
cJSON *root,*dir1,*dir2;

    
char *out;

    
const char *ro = “Root”;

    
root=cJSON_CreateObject();

    
cJSON_AddItemToObject(root,ro,dir1=cJSON_CreateArray());

    
cJSON_AddNumberToObject(dir1,”key”,800);

    
cJSON_AddNumberToObject(dir1,”value”,600);

    
cJSON_AddStringToObject(dir1,”Title”,”key and
value”);

    
cJSON_AddItemToObject(root,ro,dir2=cJSON_CreateArray());

    
cJSON_AddNumberToObject(dir2,”value”,125);

    
cJSON_AddStringToObject(dir2,”key”,”100″);

    
cJSON_AddStringToObject(dir2,”Title”,”value and
key”);

    
out=cJSON_Print(root);

    
cJSON_Delete(root);

    
return out;

}

void parse1(char *out)

{

    
cJSON * root,*arrayItem,*item,*name,*path,*flag;

    
int i = 0,size = 0;

    
char *pr = NULL,*na = NULL,*pa = NULL,*fl = NULL;

    
//
將字串解析成json結構體

 
   root = cJSON_Parse(out);

    
//
根據結構體獲取陣列大小

    
size = cJSON_GetArraySize(root);

    
//printf(“%d\n”,size);

    
//
遍歷數組

    
for(i=0;i

    
{

         //獲取第i個陣列項

         arrayItem =
cJSON_GetArrayItem(root,i);

         if(arrayItem)

         {

             
//printf(“%s\n”,”start……”);

              //講json結構體轉換成字串

              pr = cJSON_Print(arrayItem);

              item = cJSON_Parse(pr);

              name =
cJSON_GetObjectItem(item,”name”);

              path =
cJSON_GetObjectItem(item,”path”);

              flag =
cJSON_GetObjectItem(item,”flag”);

              na = cJSON_Print(name);

              pa = cJSON_Print(path);

              fl = cJSON_Print(flag);

              //printf(“%s\n”,pr);

             
printf(“name:%s\n”,na);

             
printf(“path:%s\n”,pa);

             
printf(“flag:%s\n\n”,fl);

         }

    
}

}

void parse2(char *out)

{

    
cJSON * root,*Root,*Child,*arrayItem,*item,*name,*path,*flag;

    
int i = 0,size = 0;

    
char *pr = NULL,*na = NULL,*pa = NULL,*fl = NULL;

    
root = cJSON_Parse(out);

    
if(root)

    
{

         Root =
cJSON_GetObjectItem(root,”Root”);

         if(Root)

         {

              name =
cJSON_GetObjectItem(Root,”name”);

              path =
cJSON_GetObjectItem(Root,”path”);

              flag =
cJSON_GetObjectItem(Root,”flag”);

              na = cJSON_Print(name);

              pa = cJSON_Print(path);

              fl = cJSON_Print(flag);

              printf(“Root:\n”);

             
printf(“name:%s\n”,na);

             
printf(“path:%s\n”,pa);

             
printf(“flag:%s\n\n”,fl);

         }

         Child =
cJSON_GetObjectItem(root,”Child”);

         if(Child)

         {

              size =
cJSON_GetArraySize(Child);

             
//printf(“%d\n”,size);

              printf(“Child:\n”);

              for(i=0;i

              {

                   arrayItem =
cJSON_GetArrayItem(Child,i);

                   if(arrayItem)

                   {

                       //printf(“%s\n”,”start……”);

                       pr =
cJSON_Print(arrayItem);

                       item =
cJSON_Parse(pr);

                       name =
cJSON_GetObjectItem(item,”name”);

                       path =
cJSON_GetObjectItem(item,”path”);

                       flag =
cJSON_GetObjectItem(item,”flag”);

                       na =
cJSON_Print(name);

                       pa =
cJSON_Print(path);

                       fl =
cJSON_Print(flag);

                      
//printf(“%s\n”,pr);

                      
printf(“name:%s\n”,na);

                      
printf(“path:%s\n”,pa);

                      
printf(“flag:%s\n\n”,fl);

                   }

              }

         }

    
}

}

int main()

{

    
char *out1 = create1();

    
char *out2 = create2();

    
char *out3 = create3();

    
char *out4 = create4();

    
printf(“%s\n\n\n”,out1);

    
parse1(out1);

    
printf(“%s\n\n\n”,out2);

    
parse2(out2);

    
printf(“%s\n\n\n”,out3);

    
printf(“%s\n\n\n”,out4);

    
return 0;

}