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API JSON-RPC connection with C: A Guide
JSON-RPC (calling the notation procedure of JavaScript objects) is a light and open standard for remote procedural call, which allows programmers to interact with servers via HTTP. Although the JSON-RPC protocol has become more and more popular in recent years, you can always call these API interfaces from languages other than JavaScript, including C.
In this article, we will explain how to make RPC connections with C, focusing on calling the API JSON-RPC interface using the «Cur» command line and its counterpart for Windows: ‘Cur’.
Why use C for RPC connections?
Although it is possible to call JSON-RPC API interfaces in other languages, such as Python or Ruby, C offers several advantages:
* Performance : It is a low level language that allows direct access to material resources, which leads to faster performance.
* Memory management
: C has manual memory management, which can be more effective than the mechanisms of collecting garbage in other languages.
* Portability : Code C can work on any platform that supports the standard and «curl library, which makes it a great choice to create multiplatform.
Step 1: Configure the API JSON-RPC interface
First you will have to configure the API JSON-RPC interface. Basically, this requires creating application on the server side using languages such as node.js, Python or Ruby, which show an interface with specific methods and parameters.
In this example, we will use the «Cur» poem tool to interact with our API JSON-RPC.
Step 2: Save the C code for the API
Here is an example of how you can write a simple JSON-RPC API interface using C:
`C
#include
#include
// Define the API structure
Typedef Struct {
Char Method *;
Void ( Func) (Void );
} RPC_API;
// Management function of incoming RPC demands
Rpc_api handle_rpc_request (RPC_API API, Consta Char * Method) {
// Check if the request is correct
If (StrCMP (method, «example_method»)! = 0) {
Printf («unos important request:% s \ n», method);
Turn Null;
}
// Call a function with the reserved value of the space argument
Char * arg = «hello world!»;
API-> FUNC (Arg);
API Return;
}
// Works on the management of upcoming RPC answers
void handle_rpc_respons (void answer, int status_code) {
Switch (status_code) {
Case 200:
// returns the answer as the JSON channel
fprintf (sterr, «answer:% s \ n», answer);
break;
Default:
fprintf (sterr, «error:% d \ n», status_code);
Turn Null;
}
}
// Main function for managing the upcoming RPC demands
int hand () {
RPC_API API;
// Initiate the API interface using the reserved space function
Api.method = «example_method»;
API.FUC = CAND_RPC_request;
// configurates HTTP server headphones
int server_fd, new_socket;
Struct Sockaddr_in Address;
Socklen_T Addrlen = SIZEOF (address);
// connect the 8080 port to the plugin
If ((server_fd = socket (af_inet, social_stream, 0)) == 0) {
Perror («nest»);
trip (1);
}
Address.sin_family = af_inet;
Address.sin_Port = htons (8080);
INET_PTON (AF_INET, «127.0.0.1», and address.sin_addr);
// Listen to incoming calls
If (bind (server_fd, (Struct Sockaddr *) and address, sizeof (address)) == -1) {
Perror («bond»);
trip (1);
}
// accept incoming calls
If (new_socket = accept (server_fd, (Struct Sockaddr *) and address and Addrlen)) <0) {
Perror («accept»);
trip (1);
}
Printf («server listening to the port of 8080 …
