From a1192a14c6a52e8ab77e1c84e38b65aa5e250bec Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 27 May 2021 15:13:46 +0800
Subject: import(life): Add computer network experiment.

---
 works/life/computer-network-experiment/client.cpp | 66 +++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 works/life/computer-network-experiment/client.cpp

(limited to 'works/life/computer-network-experiment/client.cpp')

diff --git a/works/life/computer-network-experiment/client.cpp b/works/life/computer-network-experiment/client.cpp
new file mode 100644
index 0000000..926ece6
--- /dev/null
+++ b/works/life/computer-network-experiment/client.cpp
@@ -0,0 +1,66 @@
+/** Created by crupest.
+ *  This is the client program.
+ */
+
+#include <Windows.h>
+#include <iostream>
+#include <string>
+#include <winsock.h>
+
+#pragma comment(lib, "ws2_32.lib")
+
+const auto connect_address = "127.0.0.1"; // control connect address
+const u_short port = 1234;                // control connect port
+
+int main() {
+  WSADATA wsa_data;
+
+  if (WSAStartup(MAKEWORD(2, 2), &wsa_data)) // initialize wsa
+  {
+    std::cerr << "WSA start up error!\n";
+    WSACleanup();
+    return 1;
+  }
+
+  int client_socket;
+
+  if ((client_socket = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
+    std::cerr << "Failed to create socket!\n";
+    WSACleanup();
+    return 1;
+  }
+
+  sockaddr_in server_address;
+
+  server_address.sin_family = AF_INET;
+  server_address.sin_port = htons(port);
+  server_address.sin_addr.s_addr = inet_addr(connect_address);
+  memset(&(server_address.sin_zero), 0, sizeof(server_address.sin_zero));
+
+  if (connect(client_socket, (sockaddr *)&server_address, sizeof(sockaddr)) ==
+      SOCKET_ERROR) {
+    std::cerr << "Failed to connect!";
+    WSACleanup();
+    return 1;
+  }
+
+  const int buffer_size = 100;
+  char * buffer = new char[buffer_size];
+
+  int received_number = recv(client_socket, buffer, buffer_size, 0);
+
+  if (received_number == -1) {
+    std::cerr <<  "Failed to recv.";
+    WSACleanup();
+    return 1;
+  }
+
+  std::string s(buffer, received_number);
+
+  std::cout << "Received message:\n" << s; 
+
+  closesocket(client_socket);
+  WSACleanup();
+
+  return 0;
+}
-- 
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