Full Duplex Communication / Sample / C++/MFC

Question

Full Duplex Communication / Sample / C++/MFC

Markus Freitag 3,791

Hello!

There must be a good example of Socket, Tcp/Ipthat does the following.

Duplex operation between client and server
Automatic reconnection
On 10 failed attempts, error message.
Read until the root element is received.
Read until the element root has been received, if necessary buffer it in a processing list and process it bit by bit

Send from Server to Client or the other way around.

<ROOT>
  <REQUEST>
    <VARIANT name="TEST01022034">
      <PROGRAM name="87.1554.0_87.1554.0" />
    </VARIANT>
    <VARIANT name="TEST01022023">
      <PROGRAM name="99.884.0_M" />
      <PROGRAM name="99.884.0_MR" />
      <PROGRAM name="AAA_AAAAA" />
      <PROGRAM name="BBB_AAAAA" />
    </VARIANT>
  </REQUEST>
</ROOT>

Send from Client to Server or the other way around.

<ROOT>
  <RESPONSE>
    <CURRENT name="TEST01022034">
      <PRODUCT name="Washing_machine_99.8854.0_99.8854.0" />
    </CURRENT>
   </RESPONSE>
</ROOT>

There are many small examples, 1000 variants. Is there a good working example for this use case? Thank you in advance for your help.

C++ / MFC // VS2017/2019

Minxin Yu 13,506 Reputation points Microsoft External Staff

2023-12-26T02:46:04.7333333+00:00

Your question contains multiple requirements. I'm afraid there is no such reference example. Have you tried searching examples on GitHub for each problem individually.
Markus Freitag 3,791 Reputation points

2023-12-26T09:26:53.07+00:00

Have you tried searching examples on GitHub for each problem individually.

Yes, I use Google to help. Unfortunately I couldn't find a good example, which is the reason for my question here. Is difficult. Maybe you can find another example. Thanks in advance.
Minxin Yu 13,506 Reputation points Microsoft External Staff

2023-12-28T08:05:10.8833333+00:00

I searched for examples of chat room and some contain MFC examples. I found very few examples of reconnecting to the server.
https://github.com/search?q=chat+room+language%3AC%2B%2B&type=repositories&p=1
Reconnect : https://github.com/TenfyRoot/SocketReconnect/blob/master/Client/ClientDlg.cpp
In addition, do you want to send the xml file or read the xml and send the content without the xml format?
Markus Freitag 3,791 Reputation points

2023-12-28T14:53:41.7266667+00:00

I have a look at it. Thanks. I'm looking for a kind of chat. (send / receive) Client/Server

In addition, do you want to send the xml file or read the xml and send the content without the xml format?

I create an XML document, convert it to string and send it to the server. It converts the information and sends an answer. Do you understand what I need?
Minxin Yu 13,506 Reputation points Microsoft External Staff

2023-12-29T08:59:47.3833333+00:00

For handling xml, consider using xml related libraries. Such as Get Ready to Work with MSXML
Markus Freitag 3,791 Reputation points

2023-12-29T13:53:20.76+00:00

You have understood my goal, I want to send an XML structure, a request to the server, which also responds with XML.

But the server can also send a request at an indefinite time and that is difficult.

Full duplex operation. In C# that would probably be with TCP/IP Listener.

Minxin Yu 13,506 Microsoft External Staff

Create a thread to receive message.

Simplified server console example:


#include <Winsock2.h>
#include <iostream>
#include <thread>
#pragma comment (lib, "Ws2_32.lib")
void receiveMsg(SOCKET sockClient) {
    while (1) {
        char recvBuf[50];
        recv(sockClient, recvBuf, 50, 0);
        if (recvBuf != NULL)
            printf("receive:%s\n", recvBuf);
       //Add a condition to control the end of the loop
    }
}
int main() {
    setvbuf(stdout, NULL, _IONBF, 0);
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
    wVersionRequested = MAKEWORD(1, 1);
    err = WSAStartup(wVersionRequested, &wsaData);
    if (err != 0)
    {
        return 0;
    }
    if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) {
        WSACleanup();
        return 1;
    }
    SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    addrSrv.sin_family = AF_INET;
    addrSrv.sin_port = htons(6000);
    bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));
    listen(sockSrv, SOMAXCONN);
    printf("waiting connection......\n");
    SOCKADDR_IN addrClient;
    int len = sizeof(SOCKADDR);

    SOCKET sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
    printf("connected\n");
    std::thread t1(receiveMsg, sockConn);
    t1.detach();
    printf("input：\n");
    while (1) {
        char temp[50];
        std::cin >> temp;
        send(sockConn, temp, strlen(temp) + 1, 0);
    }
    closesocket(sockConn);
}

Markus Freitag 3,791 Reputation points

2024-01-05T18:14:49.9566667+00:00
Thanks for your help.
Do you have or know a C++/MFC project like a chat.

Send and receive from both sides. User input.
Requests

Client

Server

Response

Client

Server
Markus Freitag 3,791 Reputation points

2024-01-10T19:35:38.4033333+00:00

Do you have another good tip for me? A good example with operator input, send and receive? Thanks for your feedback in advance.

Your answer

Minxin Yu 13,506 Reputation points Microsoft External Staff

2023-12-26T02:46:04.7333333+00:00

Your question contains multiple requirements. I'm afraid there is no such reference example. Have you tried searching examples on GitHub for each problem individually.
Markus Freitag 3,791 Reputation points

2023-12-26T09:26:53.07+00:00

Have you tried searching examples on GitHub for each problem individually.

Yes, I use Google to help. Unfortunately I couldn't find a good example, which is the reason for my question here. Is difficult. Maybe you can find another example. Thanks in advance.
Minxin Yu 13,506 Reputation points Microsoft External Staff

2023-12-28T08:05:10.8833333+00:00

I searched for examples of chat room and some contain MFC examples. I found very few examples of reconnecting to the server.
https://github.com/search?q=chat+room+language%3AC%2B%2B&type=repositories&p=1
Reconnect : https://github.com/TenfyRoot/SocketReconnect/blob/master/Client/ClientDlg.cpp
In addition, do you want to send the xml file or read the xml and send the content without the xml format?
Markus Freitag 3,791 Reputation points

2023-12-28T14:53:41.7266667+00:00

I have a look at it. Thanks. I'm looking for a kind of chat. (send / receive) Client/Server

In addition, do you want to send the xml file or read the xml and send the content without the xml format?

I create an XML document, convert it to string and send it to the server. It converts the information and sends an answer. Do you understand what I need?
Minxin Yu 13,506 Reputation points Microsoft External Staff

2023-12-29T08:59:47.3833333+00:00

For handling xml, consider using xml related libraries. Such as Get Ready to Work with MSXML
Markus Freitag 3,791 Reputation points

2023-12-29T13:53:20.76+00:00

You have understood my goal, I want to send an XML structure, a request to the server, which also responds with XML.

But the server can also send a request at an indefinite time and that is difficult.

Full duplex operation. In C# that would probably be with TCP/IP Listener.
Minxin Yu 13,506 Reputation points Microsoft External Staff

2024-01-04T02:56:25.2266667+00:00

Create a thread to receive message.

Simplified server console example:

#include <Winsock2.h> #include <iostream> #include <thread> #pragma comment (lib, "Ws2_32.lib") void receiveMsg(SOCKET sockClient) { while (1) { char recvBuf[50]; recv(sockClient, recvBuf, 50, 0); if (recvBuf != NULL) printf("receive:%s\n", recvBuf); //Add a condition to control the end of the loop } } int main() { setvbuf(stdout, NULL, _IONBF, 0); WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD(1, 1); err = WSAStartup(wVersionRequested, &wsaData); if (err != 0) { return 0; } if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) { WSACleanup(); return 1; } SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(6000); bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR)); listen(sockSrv, SOMAXCONN); printf("waiting connection......\n"); SOCKADDR_IN addrClient; int len = sizeof(SOCKADDR); SOCKET sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len); printf("connected\n"); std::thread t1(receiveMsg, sockConn); t1.detach(); printf("input：\n"); while (1) { char temp[50]; std::cin >> temp; send(sockConn, temp, strlen(temp) + 1, 0); } closesocket(sockConn); }
Markus Freitag 3,791 Reputation points

2024-01-05T18:14:49.9566667+00:00

Thanks for your help.
Do you have or know a C++/MFC project like a chat.

Send and receive from both sides. User input.
Requests

Client

Server

Response

Client

Server
Markus Freitag 3,791 Reputation points

2024-01-10T19:35:38.4033333+00:00

Do you have another good tip for me? A good example with operator input, send and receive? Thanks for your feedback in advance.

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Full Duplex Communication / Sample / C++/MFC

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