Compile, link and execute some simple demos of libwebsockets 3.1 with VS 2010 on Windows 7 (3)

本文链接：https://blog.youkuaiyun.com/henter/article/details/89322800

本文详细介绍如何在'lws-demos'目录下创建并运行一个简易的WebSocket回声服务器。通过修改必要的源文件和编译设置，使用Makefile进行编译，最终运行服务器并测试其功能。同时，介绍了一个简单的客户端HTML页面，用于测试服务器的回声功能。

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Example 3: minimal websocket echo server
A minimal websocket echo server demo is put into the directory 'minimal-examples\ws-server\minimal-ws-server-echo'.

Create a subfolder 'minimal-ws-server-echo' below the directory 'lws-demos'. Copy such files to the path 'lws-demos\minimal-ws-server-echo': minimal-ws-server-echo.c, protocol_lws_minimal_server_echo.c, websockets.dll, libcrypto-1_1.dll, libssl-1_1.dll.
Errors will be reported if compilation is done directly. The file 'protocol_lws_minimal_server_echo.c' and 'lws-demos\include\libwebsockets\lws-protocols-plugins.h' should be modified as follows:

1. Add

#include "libwebsockets/lws-protocols-plugins.h"

to the beginning of the file 'protocol_lws_minimal_server_echo.c', just before the line #include <string.h>;

2. Add the following programming statements to the file 'lws-demos\include\libwebsockets\lws-protocols-plugins.h' in order to prevent the header file from being included multiple times.
Add to the beginning of the file:

#ifndef HEADER_LWS_PROTOCOLS_PLUGINS_H
  #define HEADER_LWS_PROTOCOLS_PLUGINS_H

Add to the endo of the file:

#endif

3. Search the programming statement of #ifdef LWS_WITH_PLUGINS in the file 'lws-demos\include\libwebsockets\lws-protocols-plugins.h', and add the macro definition to the line before that statement:

#define LWS_WITH_PLUGINS

Use any text editor to create a file named by 'Makefile'. Its content is:

SRC=minimal-ws-server-echo.c protocol_lws_minimal_server_echo.c
OBJ=minimal-ws-server-echo.obj protocol_lws_minimal_server_echo.obj
PROG=minimal-ws-server-echo.exe

CFLAGS=/I "../include" /I "../openssl-1.1.1/include" /c /ZI /nologo /W3 /WX- /Od /Oy- /D "WIN32" /D "_CONSOLE" /Gm /EHsc /RTC1 /GS /fp:precise /Zc:forScope  /Gd /analyze- /ERRORREPORT:QUEUE
LINKER=link.exe
LFLAGS=/LIBPATH:"../lib" /INCREMENTAL /NOLOGO "websockets.lib" "kernel32.lib" "user32.lib" "advapi32.lib"  /SUBSYSTEM:CONSOLE /DYNAMICBASE /NXCOMPAT /MACHINE:X86 /ERRORREPORT:QUEUE

$(PROG):$(OBJ)
    $(LINKER) $(LFLAGS) $(OBJ) /OUT:$(PROG)
$(OBJ):$(SRC)
    $(CC) $(CFLAGS) $(SRC)

clean:
    del $(OBJ)
    del $(PROG)
    del *.idb
    del *.pdb
    del *.ilk
    del *.exp
    del *.lib

Open a command-line window, execute the following instructions:

cd/d C:\Microsoft Visual Studio 10.0\VC
vcvarsall.bat x86
cd Temp\lws-demos\minimal-ws-server-echo
nmake

The file 'minimal-ws-server-echo.exe' is created.

When you want to delete the exe file and other intermediary files for re-creation, execute the instruction:
nmake clean

Run the file 'minimal-ws-server-echo.exe' and allow it to be accessed through the Windows firewall. The minimal websocket echo server is running!

It cannot be accessed by a web browser. Next how to make a simple client is introduced. Use text editor to create a HTML file 'ws-server-test.html'. Its content is as follows:

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" >
    <title>WebSocket</title>
</head>
<body>
    <h1>Echo Test</h1>
    <input id="sendTxt" type="text"/>
    <button id="sendBtn">Send</button>
    <div id="recv"></div>
    <script type="text/javascript">
        var WebSocket = new WebSocket("ws://localhost:7681");
        WebSocket.onopen = function(){
            document.getElementById("recv").innerHTML = "Websocket open!\nConnected";
        }
        WebSocket.onclose = function(){
            document.getElementById("recv").innerHTML = "Websocket close!";
        }
        WebSocket.onmessage = function(e){
            document.getElementById("recv").innerHTML = e.data;
        }
        document.getElementById("sendBtn").onclick = function(){
            var txt = document.getElementById("sendTxt").value;
            WebSocket.send(txt);
        }
    </script>
</body>
</html>

Use a web browser to open 'ws-server-test.html', the web page is shown as follows:

Input 'Hello, world!' in the input box, then click the 'send' button. The input will be shown below the text box: