- 1 year ago
Cannot assign sin_addr of sockaddr_in
The sin_addr
field of sockaddr_in
structure represents the IP address in the struct sockaddr_in
structure used in socket programming. However, the sin_addr
field is not directly assignable. Instead, you need to use specific functions and data types to manipulate IP addresses. Here's an example of how you can assign an IP address to the sin_addr
field:
cpp#include <iostream>
#include <cstring>
#include <arpa/inet.h> // Required for inet_pton function
int main() {
struct sockaddr_in serverAddress;
std::memset(&serverAddress, 0, sizeof(serverAddress)); // Initialize the structure
serverAddress.sin_family = AF_INET; // Set address family
serverAddress.sin_port = htons(8080); // Set port number
const char* ipAddress = "127.0.0.1"; // IP address as a string
if (inet_pton(AF_INET, ipAddress, &(serverAddress.sin_addr)) <= 0) {
std::cerr << "Failed to assign IP address" << std::endl;
return 1;
}
// Rest of your code
return 0;
}
In this example:
The
inet_pton()
function is used to convert the IP address from the string format (ipAddress
) to binary format (serverAddress.sin_addr
).The
AF_INET
parameter in theinet_pton()
function specifies that the IP address is in IPv4 format.The
htons()
function is used to convert the port number to network byte order.The rest of the code can be added to handle the socket creation, connection, or any other networking operations.
Make sure to include the required headers, such as <cstring>
for memset
and <arpa/inet.h>
for inet_pton
.
By using the inet_pton()
function, you can assign an IP address to the sin_addr
field of the sockaddr_in
structure correctly.