According to Baidu's speech recognition example, show how C uses Cjson

The previous article shows how to call C + + method According to Baidu speech recognition example, This article is based on Baidu speech recognition, show how to use Cjson,cjson is a C write JSON parser, very useful, you can use it to generate a json, It can also be used to parse the JSON Value.

In the code I wrote about getting tokens through skey.

Char *token = (char *) malloc (max_buffer_size);

Char host[max_buffer_size];

snprintf (host, sizeof (host),

"https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials&client_id=%s&client_secret=%s ",

apiKey, secretkey);

FILE *FPP = NULL;

Char cmd[max_buffer_size];

Char *result = (char *) malloc (max_result_size);

Char *curl_cmd = "curl-s";

Char *yinhao = "\" ";

strcpy (cmd, curl_cmd);

strcat (cmd, yinhao);

strcat (cmd, host);

strcat (cmd, yinhao);

FPP = Popen (cmd, "r");

printf ("\n%s\n", cmd);

Fgets (result, max_result_size, fpp);

Pclose (fpp);

If (result! = NULL)

{

Cjson *root;

root = Cjson_parse (result);

If (!root)

{

printf ("\nget Root Failed");

return-1;

}

Token1 = Cjson_getobjectitem (root, "access_token")->valuestring;

strcpy (token, token1);

printf ("\n%s\n", token);

Cjson_delete (root);

Free (result);

}

Result is the JSON result, how to get the value of each node after getting json? You need to use the IF (result!=null) code, first Cjson define a root node Cjson *root, and then through the cjson_parse to obtain the root node, the root node, then through the Cjson_getobjectitem ( root, "access_token") Gets the value of the Access_token at the level below the root, and its JSON structure is like this

{

access_tokeen:xxxxxx,

Len:xxxxxxx

}

, after use to Cjson_delete.

Baidu Speech recognition post is submitted by json, so you need to assemble a json, the assembly code is as Follows:

Cjson *buffer;

Buffer = Cjson_createobject ();

Cjson_additemtoobject (buffer, "format", cjson_createstring ("pcm"));

Cjson_additemtoobject (buffer, "rate", cjson_createstring ("8000"));

Cjson_additemtoobject (buffer, "channel", cjson_createstring ("1"));

Cjson_additemtoobject (buffer, "token", cjson_createstring (token));

Cjson_additemtoobject (buffer, "cuid", cjson_createstring (cuid));

Cjson_additemtoobject (buffer, "len", cjson_createstring (content_length));

Cjson_additemtoobject (buffer, "speech", cjson_createstring (decode_data));

A cjson_createobject to bump into an object and then add a node to the object via cjson_additemtoobject, cjson_additemtoobject (buffer, "format", cjson_ Createstring ("pcm")); Format is the node name, and PCM is the value of the Node.

The resulting effect is

According to Baidu's speech recognition example, show how C uses Cjson