URL represent an immutable Uniform Resource Locator.
A Uniform Resource Locator (URL), is used to uniquely identify a resource on the Internet. The URL is a compact text string with a restricted syntax that consists of four main components:
<protocol>://<authority><path>?<query> The <protocol> part is mandatory, the other components may or may not be present in an URL string. For instance the file protocol only use the path component while a http protocol may use all components. Here is an example where all components are used:
http://user:password@www.foo.bar:8080/document/index.csp?querystring#ref
The following URL components are automatically unescaped according to the escaping mechanism defined in RFC 2396; credentials, path and parameter values.
An IPv6 address can be used for host as defined in RFC2732 by enclosing the address in [brackets]. For instance, mysql://[2010:836B:4179::836B:4179]:3306/test
For more information about the URL syntax and specification, see, RFC2396 - Uniform Resource Identifiers (URI): Generic Syntax
Macros | |
| #define | T URL_T |
Typedefs | |
| typedef struct URL_S * | T |
Functions | |
| T | URL_new (const char *url) |
Create a new URL object from the url parameter string. More... | |
| T | URL_create (const char *url,...) |
| Factory method for building an URL object using a variable argument list. More... | |
| void | URL_free (T *U) |
| Destroy a URL object. More... | |
Properties | |
| const char * | URL_getProtocol (T U) |
| Get the protocol of the URL. More... | |
| const char * | URL_getUser (T U) |
| Get the user name from the authority part of the URL. More... | |
| const char * | URL_getPassword (T U) |
| Get the password from the authority part of the URL. More... | |
| const char * | URL_getHost (T U) |
| Get the hostname of the URL. More... | |
| int | URL_getPort (T U) |
| Get the port of the URL. More... | |
| const char * | URL_getPath (T U) |
| Get the path of the URL. More... | |
| const char * | URL_getQueryString (T U) |
| Get the query string of the URL. More... | |
| const char ** | URL_getParameterNames (T U) |
| Returns an array of string objects with the names of the parameters contained in this URL. More... | |
| const char * | URL_getParameter (T U, const char *name) |
| Returns the value of a URL parameter as a string, or NULL if the parameter does not exist. More... | |
| const char * | URL_toString (T U) |
| Returns a string representation of this URL object. More... | |
Class methods | |
| char * | URL_unescape (char *url) |
| Class method, unescape an url string. More... | |
| char * | URL_escape (const char *url) |
| Class method, escape an url string converting unsafe characters to a hex (%HEXHEX) representation. More... | |
| #define T URL_T |
| typedef struct URL_S* T |
| T URL_new | ( | const char * | url | ) |
| T URL_create | ( | const char * | url, |
| ... | |||
| ) |
Factory method for building an URL object using a variable argument list.
Important: since the '%' character is used as a format specifier (e.g. %s for string, %d for integer and so on), submitting an URL escaped string (i.e. a %HEXHEX encoded string) in the url parameter can produce undesired results. In this case, use either the URL_new() method or URL_unescape() the url parameter first.
| url | A string specifying the URL |
url parameter cannot be parsed as an URL. | void URL_free | ( | T * | U | ) |
Destroy a URL object.
| U | A URL object reference |
| const char * URL_getProtocol | ( | T | U | ) |
Get the protocol of the URL.
| U | An URL object |
| const char * URL_getUser | ( | T | U | ) |
Get the user name from the authority part of the URL.
| U | An URL object |
| const char * URL_getPassword | ( | T | U | ) |
Get the password from the authority part of the URL.
| U | An URL object |
| const char * URL_getHost | ( | T | U | ) |
Get the hostname of the URL.
| U | An URL object |
| int URL_getPort | ( | T | U | ) |
Get the port of the URL.
| U | An URL object |
| const char * URL_getPath | ( | T | U | ) |
Get the path of the URL.
| U | An URL object |
| const char * URL_getQueryString | ( | T | U | ) |
Get the query string of the URL.
| U | An URL object |
| const char ** URL_getParameterNames | ( | T | U | ) |
Returns an array of string objects with the names of the parameters contained in this URL.
If the URL has no parameters, the method returns NULL. The last value in the array is NULL. To print all parameter names and their values contained in this URL, the following code can be used:
const char **params = URL_getParameterNames(U);
if (params)
for (int i = 0; params[i]; i++)
printf("%s = %s\n", params[i], URL_getParameter(U, params[i]));
| U | An URL object |
| const char * URL_getParameter | ( | T | U, |
| const char * | name | ||
| ) |
Returns the value of a URL parameter as a string, or NULL if the parameter does not exist.
If you use this method with a multi-valued parameter, the value returned is the first value found. Lookup is case-sensitive.
| U | An URL object |
| name | The parameter name to lookup |
| const char * URL_toString | ( | T | U | ) |
Returns a string representation of this URL object.
| U | An URL object |
| char * URL_unescape | ( | char * | url | ) |
Class method, unescape an url string.
The url parameter is modified by this method.
| url | an escaped url string |
url string | char * URL_escape | ( | const char * | url | ) |
Class method, escape an url string converting unsafe characters to a hex (%HEXHEX) representation.
The following URL unsafe characters are encoded:
<>"#%%{}|\^ [] ` as well as characters in the interval 00-1F hex (0-31 decimal) and in the interval 7F-FF (127-255 decimal) The caller must free the returned string. If the url parameter is NULL then this method returns NULL, if it is the empty string "" a new empty string is returned.
| url | an url string |
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