added a more full example

coolaj86 · Sep 9, 2010 · c6994e1 · c6994e1
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,22 @@
+*.o
+*.lo
+*.la
+*.m4
+*.cache
+.deps/
+.libs/
+src/Makefile*
+config.guess
+config.h
+config.log
+config.status
+config.sub
+configure
+depcomp
+install-sh
+json.pc
+libtool
+ltmain.sh
+missing
+stamp-h1
+test1
diff --git a/README.md b/README.md
@@ -0,0 +1,16 @@
+Installation on Ubuntu
+====
+
+    apt-get install libtool git-core
+    git clone http://github.com/admp/json-c.git
+    cd json-c/src
+    sh autogen.sh
+    ./configure
+    make
+    sudo make install
+    sudo ldconfig
+
+Installation on OpenEmbedded
+====
+
+    bitbake json-c
diff --git a/examples/glossary/.gitignore b/examples/glossary/.gitignore
@@ -0,0 +1 @@
+example
diff --git a/examples/glossary/Makefile b/examples/glossary/Makefile
@@ -0,0 +1,5 @@
+all:
+	@$(CC) -o example example.c -ljson -Wall -Werror
+	@./example
+
+.PHONY: all
diff --git a/examples/glossary/README.md b/examples/glossary/README.md
@@ -0,0 +1,3 @@
+Practicle Examples with JSON-C
+====
+
diff --git a/examples/glossary/example.c b/examples/glossary/example.c
@@ -0,0 +1,138 @@
+#include <stdio.h> // for fopen, fclose
+#include <stdlib.h> // for exit
+#include <string.h> // for strlen, strcpy
+#include <json/json.h> // for json_object
+
+#include "example.h"
+
+int main (int argc, char** argv) {
+  char* filename = "example.json";
+  char* buffer = NULL;
+  struct json_object *root_obj;
+  struct json_object *glossary_obj;
+  struct json_object *glossList_obj;
+  struct json_object *glossListElement_obj;
+  struct json_object *glossSeeAlso_obj;
+  struct json_object *glossSeeAlsoElement_obj;
+  struct json_object *glossDiv_obj;
+  glossary_s glossary = {};
+  glossDiv_s glossDiv = {};
+  glossList_s* glossList;
+  int glossList_len = 0;
+  int i = 0;
+  int glossSeeAlso_len = 0;
+  int j = 0;
+  char** glossSeeAlso;
+
+  get_file_contents(filename, &buffer);
+  printf("%s",buffer);
+
+  root_obj = json_tokener_parse(buffer);
+  printf("root_obj.to_string():\n%s\n\n", json_object_to_json_string(root_obj));
+
+  glossary_obj = json_object_object_get(root_obj, "glossary");
+    printf("glossary_obj.to_string():\n%s\n\n", json_object_to_json_string(glossary_obj));
+    glossary.title = get_json_string_val(glossary_obj, "title");
+    glossary.pageCount = json_object_get_int(json_object_object_get(glossary_obj, "pageCount"));
+    glossDiv_obj = json_object_object_get(glossary_obj, "GlossDiv");
+      printf("glossDiv_obj.to_string():\n%s\n\n", json_object_to_json_string(glossDiv_obj));
+      glossDiv.title = get_json_string_val(glossDiv_obj, "title");
+        glossList_obj = json_object_object_get(glossDiv_obj, "GlossList");
+        glossList_len = json_object_array_length(glossList_obj);
+        glossList = malloc(sizeof(glossList) * glossList_len);
+        for (i = 0; i < glossList_len; i += 1) {
+          glossListElement_obj = json_object_array_get_idx(glossList_obj, i);
+          glossList[i].id = get_json_string_val(glossListElement_obj, "ID");
+          glossList[i].sortAs = get_json_string_val(glossListElement_obj, "SortAs");
+          glossList[i].glossTerm = get_json_string_val(glossListElement_obj, "GlossTerm");
+          glossList[i].acronym = get_json_string_val(glossListElement_obj, "Acronym");
+          glossList[i].abbrev = get_json_string_val(glossListElement_obj, "Abbrev");
+          glossList[i].glossDef = get_json_string_val(glossListElement_obj, "GlossDef");
+          // GlossSeeAlso is a string Array
+          glossSeeAlso_obj = json_object_object_get(glossListElement_obj,"GlossSeeAlso");
+          glossSeeAlso_len = json_object_array_length(glossSeeAlso_obj);
+          glossSeeAlso = malloc(sizeof(char*) * glossSeeAlso_len);
+          for (j = 0; j < glossSeeAlso_len; j += 1) {
+            glossSeeAlsoElement_obj = json_object_array_get_idx(glossSeeAlso_obj, j);
+            glossSeeAlso[j] = memstrcpy(json_object_get_string(glossSeeAlsoElement_obj));
+          }
+          glossList[i].glossSeeAlso = glossSeeAlso;
+        }
+      glossDiv.glossList = glossList;
+    glossary.glossDiv = glossDiv;
+
+  // returns null
+  root_obj = json_object_object_get(root_obj, "doesn't exist");
+  printf("root_obj[\"doesn't exist\"].to_string():\n%s\n", json_object_to_json_string(root_obj));
+
+  // causes segfault
+  printf("root_obj[\"doesn't exist\"][\"key of null\"].to_string():\nNOTE: this will segfault\n\n");
+  root_obj = json_object_object_get(root_obj, "key of null");
+  printf("%s",json_object_to_json_string(root_obj));
+
+
+  free(buffer);
+  return EXIT_SUCCESS;
+}
+
+inline char* get_json_string_val(json_object* json_obj, const char* key) {
+  return memstrcpy(json_object_get_string(json_object_object_get(json_obj, key)));
+}
+
+inline char* memstrcpy(const char* in) {
+  char * out;
+
+  out = malloc(strlen(in) + 1);
+  strcpy(out, in);
+
+  return out;
+}
+
+/**
+ * Place the contents of the specified file into a memory buffer
+ *
+ * @param[in] filename The path and name of the file to read
+ * @param[out] filebuffer A pointer to the contents in memory
+ * @return status 0 success, 1 on failure
+ */
+int get_file_contents(const char* filename, char** outbuffer) {
+  FILE* file = NULL;
+  long filesize;
+  const int blocksize = 1;
+  size_t readsize;
+  char* filebuffer;
+
+  // Open the file
+  file = fopen(filename, "r");
+  if (NULL == file)
+  {
+    printf("'%s' not opened\n", filename);
+    exit(EXIT_FAILURE);
+  }
+
+  // Determine the file size
+  fseek(file, 0, SEEK_END);
+  filesize = ftell(file);
+  rewind (file);
+
+  // Allocate memory for the file contents
+  filebuffer = (char*) malloc(sizeof(char) * filesize);
+  *outbuffer = filebuffer;
+  if (filebuffer == NULL)
+  {
+    fputs ("malloc out-of-memory", stderr);
+    exit(EXIT_FAILURE);
+  }
+
+  // Read in the file
+  readsize = fread(filebuffer, blocksize, filesize, file);
+  if (readsize != filesize)
+  {
+    fputs ("didn't read file completely",stderr);
+    exit(EXIT_FAILURE);
+  }
+
+  // Clean exit
+  fclose(file);
+  return EXIT_SUCCESS;
+}
diff --git a/examples/glossary/example.h b/examples/glossary/example.h
@@ -0,0 +1,24 @@
+int get_file_contents(const char* filename, char** outbuffer);
+inline char* get_json_string_val(json_object* json_obj, const char* key);
+inline char* memstrcpy(const char* in);
+
+typedef struct {
+  char* id;
+  char* sortAs;
+  char* glossTerm;
+  char* acronym;
+  char* abbrev;
+  char* glossDef;
+  char** glossSeeAlso;
+} glossList_s;
+
+typedef struct {
+  char* title;
+  glossList_s* glossList;
+} glossDiv_s;
+
+typedef struct {
+  char* title;
+  int pageCount;
+  glossDiv_s glossDiv;
+} glossary_s;
diff --git a/examples/glossary/example.json b/examples/glossary/example.json
@@ -0,0 +1,25 @@
+/* more difficult test case */
+{ 
+  "glossary": {
+    "title": "example glossary",
+    "pageCount": 100,
+    "GlossDiv": {
+      "title": "S",
+      "GlossList": [
+        { 
+          "ID": "SGML",
+          "SortAs": "SGML",
+          "GlossTerm": "Standard Generalized Markup Language",
+          "Acronym": "SGML",
+          "Abbrev": "ISO 8879:1986",
+          "GlossDef": "A meta-markup language, used to create markup languages such as DocBook.",
+          "GlossSeeAlso": [
+            "GML",
+            "XML",
+            "markup"
+          ]
+        }
+      ]
+    } 
+  } 
+}
diff --git a/AUTHORS → src/AUTHORS b/AUTHORS → src/AUTHORS
diff --git a/COPYING → src/COPYING b/COPYING → src/COPYING
diff --git a/ChangeLog → src/ChangeLog b/ChangeLog → src/ChangeLog
diff --git a/Doxyfile → src/Doxyfile b/Doxyfile → src/Doxyfile
diff --git a/INSTALL → src/INSTALL b/INSTALL → src/INSTALL
diff --git a/Makefile.am → src/Makefile.am b/Makefile.am → src/Makefile.am
diff --git a/NEWS → src/NEWS b/NEWS → src/NEWS
diff --git a/README → src/README b/README → src/README
diff --git a/README-WIN32.html → src/README-WIN32.html b/README-WIN32.html → src/README-WIN32.html
diff --git a/README.html → src/README.html b/README.html → src/README.html
diff --git a/arraylist.c → src/arraylist.c b/arraylist.c → src/arraylist.c
diff --git a/arraylist.h → src/arraylist.h b/arraylist.h → src/arraylist.h
diff --git a/autogen.sh → src/autogen.sh b/autogen.sh → src/autogen.sh
diff --git a/bits.h → src/bits.h b/bits.h → src/bits.h
diff --git a/config.h.in → src/config.h.in b/config.h.in → src/config.h.in
diff --git a/config.h.win32 → src/config.h.win32 b/config.h.win32 → src/config.h.win32
diff --git a/configure.in → src/configure.in b/configure.in → src/configure.in
diff --git a/debug.c → src/debug.c b/debug.c → src/debug.c
diff --git a/debug.h → src/debug.h b/debug.h → src/debug.h
diff --git a/json-c.vcproj → src/json-c.vcproj b/json-c.vcproj → src/json-c.vcproj
diff --git a/json.h → src/json.h b/json.h → src/json.h
diff --git a/json.pc.in → src/json.pc.in b/json.pc.in → src/json.pc.in
diff --git a/json_object.c → src/json_object.c b/json_object.c → src/json_object.c
diff --git a/json_object.h → src/json_object.h b/json_object.h → src/json_object.h
diff --git a/json_object_private.h → src/json_object_private.h b/json_object_private.h → src/json_object_private.h
diff --git a/json_tokener.c → src/json_tokener.c b/json_tokener.c → src/json_tokener.c
diff --git a/json_tokener.h → src/json_tokener.h b/json_tokener.h → src/json_tokener.h
diff --git a/json_util.c → src/json_util.c b/json_util.c → src/json_util.c
diff --git a/json_util.h → src/json_util.h b/json_util.h → src/json_util.h
diff --git a/linkhash.c → src/linkhash.c b/linkhash.c → src/linkhash.c
diff --git a/linkhash.h → src/linkhash.h b/linkhash.h → src/linkhash.h
diff --git a/printbuf.c → src/printbuf.c b/printbuf.c → src/printbuf.c
diff --git a/printbuf.h → src/printbuf.h b/printbuf.h → src/printbuf.h
diff --git a/test1.c → src/test1.c b/test1.c → src/test1.c
diff --git a/test2.c → src/test2.c b/test2.c → src/test2.c
diff --git a/test4.c → src/test4.c b/test4.c → src/test4.c
diff --git a/test5.c → src/test5.c b/test5.c → src/test5.c