[F.A.S.T]

I'm finally beginning to understand the Networking on Winsock. I was following this tutorial ; https://www.binarytides.com/winsock-sock...-tutorial/
But the way I'm doing is taking on reference and writing my own version of it.

I've came across a problem.

a value of type "const char " cannot be used to initialize an entity of type "char

Error Line :

PHP Code


<?php 
char* msg = "GET / HTTP/1.1\r\n\r\n"; 


And this is the part where that Variable is being used :

PHP Code


<?php 
// Send Data
 cout << "Sending Get request.." << endl;

 if (send(sock, msg, strlen(msg), 0) < 0) {
 cout << "Failed to Send.. " << endl;
 getchar();
 return 1;
 }
 cout << "Request Sent yo!" << endl;
 getchar();
 return 0; 


Other Information :
- IDE : Visual Studio Community.
- OS : Windows 10.

[3DES]

change

Code

char* msg = "GET / HTTP/1.1\r\n\r\n";

to

Code

const char* msg = "GET / HTTP/1.1\r\n\r\n";

const means the variable is not going to get modified during the execution of program, it will be read only.

[vmcall]

Because the variable is const (constant at after initialization, but unlike constexpr doesn't have to be compile-time constant), trying to pass it to a function that takes a non-const variable would essentially remove said constant protection.

You can either call const_cast<char*>(var) to remove the respective const modifier, or simply define the original value as const char* ('auto' would do that)

[F.A.S.T]

change

Code

char* msg = "GET / HTTP/1.1\r\n\r\n";

to

Code

const char* msg = "GET / HTTP/1.1\r\n\r\n";

const means the variable is not going to get modified during the execution of program, it will be read only.

Dang I already tried that when the Error Occurred. It does not send the data then.



FULL CODE (Click to View)

PHP Code


<?php 
#include "stdafx.h"
#include <iostream>
#include <string>
#include <Windows.h>
#include <stdio.h>
#include <winsock.h>

#pragma comment(lib, "ws2_32.lib")

using namespace std;

int main()
{
 WSADATA wsa;
 SOCKET sock;
 struct sockaddr_in server;
 const char* msg = "GET / HTTP/1.1\r\n\r\n";

 // Start up Winsock
 cout << "Starting Winsock" << endl;

 if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
 cout << "Winsock Startup Failed.";
 return 1;
 }

 cout << "Winsock Started." << endl;
 
 // Create a Network Socket.
 if (sock = socket(AF_INET, SOCK_STREAM, 0) == INVALID_SOCKET)
 {
 cout << "Server Socket was unable to start." << endl;
 }
 cout << "Socket created!" << endl;
 
 server.sin_addr.s_addr = inet_addr("www.google.com");
 server.sin_family = AF_INET;
 server.sin_port = htons(80);

 // Try to Connect to Server, Server data is defined above.
 if (connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
 cout << "Connection Failure" << endl;
 }
 cout << "Connected yo!" << endl;
 
 // Send Data
 cout << "Sending Get request.." << endl;

 if (send(sock, msg, strlen(msg), 0) < 0) {
 cout << "Failed to Send.. " << endl;
 getchar();
 return 1;
 }
 cout << "Request Sent yo!" << endl;
 getchar();
 return 0;
} 


[Mr. Kim]

Dang I already tried that when the Error Occurred. It does not send the data then.



FULL CODE (Click to View)

PHP Code


<?php 
#include "stdafx.h"
#include <iostream>
#include <string>
#include <Windows.h>
#include <stdio.h>
#include <winsock.h>

#pragma comment(lib, "ws2_32.lib")

using namespace std;

int main()
{
 WSADATA wsa;
 SOCKET sock;
 struct sockaddr_in server;
 const char* msg = "GET / HTTP/1.1\r\n\r\n";

 // Start up Winsock
 cout << "Starting Winsock" << endl;

 if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
 cout << "Winsock Startup Failed.";
 return 1;
 }

 cout << "Winsock Started." << endl;
 
 // Create a Network Socket.
 if (sock = socket(AF_INET, SOCK_STREAM, 0) == INVALID_SOCKET)
 {
 cout << "Server Socket was unable to start." << endl;
 }
 cout << "Socket created!" << endl;
 
 server.sin_addr.s_addr = inet_addr("www.google.com");
 server.sin_family = AF_INET;
 server.sin_port = htons(80);

 // Try to Connect to Server, Server data is defined above.
 if (connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
 cout << "Connection Failure" << endl;
 }
 cout << "Connected yo!" << endl;
 
 // Send Data
 cout << "Sending Get request.." << endl;

 if (send(sock, msg, strlen(msg), 0) < 0) {
 cout << "Failed to Send.. " << endl;
 getchar();
 return 1;
 }
 cout << "Request Sent yo!" << endl;
 getchar();
 return 0;
} 


Change this

Code

if (connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
cout << "Connection Failure" << endl;
}

To

Code

if (connect(sock, (struct sockaddr*)&server, sizeof(server)) != SOCK_ERROR) {
cout << "Connection Failure" << endl;
}

and call WSAGetLastError() to get the actual error

[F.A.S.T]

Change this

Code

if (connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
cout << "Connection Failure" << endl;
}

To

Code

if (connect(sock, (struct sockaddr*)&server, sizeof(server)) != SOCK_ERROR) {
cout << "Connection Failure" << endl;
}

and call WSAGetLastError() to get the actual error

Nevermind thanks alot I fixed it :) (Click to View)Thanks Mr.Kim it works. No more Connection error but It still gives an Error when sending Data.

PHP Code


<?php 
// Send Data
    cout << "Sending Get request.." << endl;

    if (send(sock, msg, strlen(msg), 0) < 0) {
        cout << "Failed to Send.. " << WSAGetLastError() <<  endl;
        getchar();
        return 1;
    }
    cout << "Request Sent yo!" << endl; 


---

Also, How do you receive an answer from the server properly.

[Hoodie+]

C++ requires you to specify const while C doesn't.

[aeiro]

Also, How do you receive an answer from the server properly.

define properly