mg_get_var( data, data_len, var_name, dst, dst_len );
|Encoded buffer from either POST data or the URI of a GET call|
|Size of the encode buffer including the terminating NULL|
|Name of the variable to search for|
|Output buffer to store the content of the variable|
|Length of the output buffer|
|The length of the variable or an error code|
mg_get_var() returns the value of a variable which is passed to the server with either a POST method, or as a parameter in the URI of a GET call. The data pointer passed to the function points to a form-URI encoded buffer. This can either be POST data or the
request_info.query_string. The name of the searched variable and a buffer to store the results are also parameters to the function.
The function either returns the length of the variable when successful,
-1 if the variable could not be found and
-2 if the destination buffer is NULL, has size zero or is too small to store the resulting variable value.