Installation and use of Linux under Jansson

1. Installing Jansson

./configure

Make

Make install

2. Generate the Help document

Cd doc

Make HTML

Spinx-build not a command when compiling and installing doc

Execute the following statement to install Sphinx

Easy_install-u Sphinx

Generate _build Folder

Cd _build/html/

Start the Help document using Firefox browser

Firefox index.html

3. Programming

Include header files: #include <jansson.h>

Add library-ljansson When compiling the connection:

Gcc–o Source Source.c–ljansson

If the execution program appears: Error while loading shared Libraries:libjansson.so.4:cannot open Shared object file:no such file or directory

Libjansson.so.4 This library is not found when the following method to solve

Find out where Libjansson.so.4 is located

Whereis Libjansson

Display: Libjansson:/usr/local/lib/libjansson.a/usr/local/lib/libjansson.la/usr/local/lib/libjansson.so

Your libjansson.so is located at:/usr/local/lib/libjansson.so

Determine if there is a real

Cd/usr/local/lib

Ls

If there is an execution of the following statement, create a libjansson.so symbol to link to the/usr/lib directory

Ln-s/usr/local/lib/libjansson.so/usr/lib/libjansson.so.4

Reload Library

Ldconfig

{"Jsonstr": "{\" incid\ ": Null,\" srcip\ ": Null,\" desip\ ": Null,\" protocol\ ": Null,\" policyid\ ": Null,\" snapshoot\ ": Null,\ "filename\": Null,\ "filetype\": Null,\ "filepath\": Null,\ "domain\": null} "," Commandkey ":" 11100112 "}

json_t *json_string(const char *value)

Returns the data type of a JSON string, converted to a format that the library can recognize. The error returns null, which must be in UTF-8 format.

Return value:new Reference.

Returns a new JSON string, or NULL on error. value must is a valid UTF-8 encoded Unicode string.

json_t *json_string_nocheck(const char *value)

Same as json_string (), does not check the validity of value

Return value:new Reference.

Like json_string (), but doesn ' t check the value is valid UTF-8. The use of this function only if your is certain, this really was the case (e.g. you has already checked it by other means).

const char *json_string_value(const json_t *string)

Returns a string in JSON string, which is a C-language string.

Returns The associated value of string as a null terminated UTF-8 encoded string, or null if string< /c7> is a JSON string.

The retuned value is read-only and must are not being modified or freed by the user. It is valid as long as a string exists, i.e. as long as its reference count have not dropped to zero.

int json_string_set(const json_t *string, const char *value)

Sets the value of string, if value is an invalid UTF-8 value, the setting fails.

Sets the associated value of string to value. value must is a valid UTF-8 encoded Unicode string. Returns 0 on Success and-1 on error.

int Json_string_set_nocheck(const json_t *string, const char *value)

Same as Json_string_set (), but does not check if value is a valid UTF-8 type

Like Json_string_set (), but doesn ' t check the value is valid UTF-8. The use of this function only if your is certain, this really was the case (e.g. you has already checked it by other means).