我正在尝试用winsock2编写一个简单的服务器。我没有把它编译好。
#define _WIN32_WINNT 0x0501
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include "dump.h"
#pragma comment(lib,"WS2_32.lib")
#define PORT 7890
int main(void)
{
//fd --> file descriptor
int sockfd, new_sockfd; //warten an sockfd, neue Verbindung an new_sockfd
struct sockaddr_in host_addr, client_addr; //Addressinformationen
//sockaddr_in aus winsock.h
//Laenge des Inputs --> winsock Alternative suchen
socklen_t sin_size;
int recv_length = 1, yes = 1;
char buffer[1024];
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
//PF_INET --> Protocol family
//AF_INET --> Addres family
printf("%s\n", "in socket");
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char *)&yes, sizeof(int)) == -1)
printf("%s\n", "setting socket option SO_REUSEADDR");
//vorbereiten auf den bind-Befehl
host_addr.sin_family = AF_INET;
host_addr.sin_port = htons(PORT);
//htons --> host to network short
//Wandelt bei 16 Bit int Hostbytereihenfolge in Netzwerkbytereihenfolge
host_addr.sin_addr.s_addr = 0; //Automatisch mit meiner IP fuellen
memset(&(host_addr.sin_zero), '\0', 8); // Rest der Struktur mit 0 fuellen
if (bind(sockfd, (struct sockaddr *) &host_addr, sizeof(struct sockaddr)) == -1)
printf("%s\n", "binding to socket");
if (listen(sockfd, 5) == -1)
{
printf("%s\n", "listening on socket");
}
//Schleife um am PORT zu lauschen und Verbindungen zu akzeptieren
while (1)
{
sin_size = sizeof(struct sockaddr_in);
//accept gibt neuen sockfd zurueck !
new_sockfd =
accept(sockfd, (struct sockaddr *) &client_addr, &sin_size);
if (new_sockfd == -1)
{
printf("%s\n", "accepting connection");
}
printf("server: got connection from %s port %d\n",
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
send(new_sockfd, "Hello, world!\n", 13, 0);
recv_length = recv(new_sockfd, buffer, 1024, 0);
while (recv_length > 0)
{
printf("RECV: %d bytes \n", recv_length);
dump(buffer, recv_length);
recv_length = recv(new_sockfd, buffer, 1024, 0);
}
closesocket(new_sockfd);
}
return 0;
}
这是第一次使用socket.h的Linux，但我尝试在windows7下使用winsock2实现它。我手动安装了Windows SDK，找到了我必须链接的库Ws2_32.lib。 我正在使用CLION中的gcc（mingw32）进行编译。我设置了参数标志
-lws2_32 -lwsock32
我知道这里有很多帖子回答这个问题，但似乎没有什么对我有用。
CLION的输出：
"C:\Program Files\JetBrains\CLion 2017.2.2\bin\cmake\bin\cmake.exe" --build C:\Users\Marcel\Desktop\Projekte\C-Projekte\Sequenz-Uebungen\Simple_Server\cmake-build-debug --target Simple_Server -- -j 2
[ 50%] Linking C executable Simple_Server.exe
CMakeFiles\Simple_Server.dir/objects.a(main.c.obj): In function `main':
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:49: undefined reference to `socket@12'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:53: undefined reference to `setsockopt@20'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:58: undefined reference to `htons@4'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:64: undefined reference to `bind@12'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:66: undefined reference to `listen@8'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:78: undefined reference to `accept@12'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:84: undefined reference to `ntohs@4'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:83: undefined reference to `inet_ntoa@4'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:85: undefined reference to `send@16'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:86: undefined reference to `recv@16'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:91: undefined reference to `recv@16'
C:/Users/Marcel/Desktop/Projekte/C-Projekte/Sequenz-Uebungen/Simple_Server/main.c:93: undefined reference to `closesocket@4'
collect2.exe: error: ld returned 1 exit status
CMakeFiles\Simple_Server.dir\build.make:95: recipe for target 'Simple_Server.exe' failed
CMakeFiles\Makefile2:66: recipe for target 'CMakeFiles/Simple_Server.dir/all' failed
CMakeFiles\Makefile2:78: recipe for target 'CMakeFiles/Simple_Server.dir/rule' failed
mingw32-make.exe[3]: *** [Simple_Server.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles/Simple_Server.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles/Simple_Server.dir/rule] Error 2
Makefile:117: recipe for target 'Simple_Server' failed
mingw32-make.exe: *** [Simple_Server] Error 2
我现在使用以下命令来编译gcc：
gcc -Wl,-verbose -lws2_32 -lwsock32 -o simple_server main.c > linker.txt
它提供以下输出：
==================================================
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../crt2.o succeeded
c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../crt2.o
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/crtbegin.o succeeded
c:/mingw/bin/../lib/gcc/mingw32/6.3.0/crtbegin.o
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/libws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/ws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/libws2_32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/ws2_32.lib failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/libws2_32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/ws2_32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0\libws2_32.a failed
attempt to open c:/mingw/bin/../lib/gcc/libws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/ws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/libws2_32.a failed
attempt to open c:/mingw/bin/../lib/gcc/ws2_32.lib failed
attempt to open c:/mingw/bin/../lib/gcc/libws2_32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/ws2_32.dll failed
attempt to open c:/mingw/bin/../lib/gcc\libws2_32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/libws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/ws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/libws2_32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/ws2_32.lib failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/libws2_32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/ws2_32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib\libws2_32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../ws2_32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libws2_32.a succeeded
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/libwsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/wsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/libwsock32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/wsock32.lib failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/libwsock32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/wsock32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0\libwsock32.a failed
attempt to open c:/mingw/bin/../lib/gcc/libwsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/wsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/libwsock32.a failed
attempt to open c:/mingw/bin/../lib/gcc/wsock32.lib failed
attempt to open c:/mingw/bin/../lib/gcc/libwsock32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/wsock32.dll failed
attempt to open c:/mingw/bin/../lib/gcc\libwsock32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/libwsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/wsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/libwsock32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/wsock32.lib failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/libwsock32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib/wsock32.dll failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/lib\libwsock32.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libwsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../wsock32.dll.a failed
attempt to open c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libwsock32.a succeeded
并且在开头：
using internal linker script:
==================================================
/* Default linker script, for normal executables */
/* Copyright (C) 2014-2017 Free Software Foundation, Inc.
Copying and distribution of this script, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. */
OUTPUT_FORMAT(pei-i386)
SEARCH_DIR("/mingw/mingw32/lib"); SEARCH_DIR("/mingw/lib"); SEARCH_DIR("/usr/local/lib"); SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib");
答案 0 :(得分：2)
首先删除#pragma comment(lib, "WS2_32.lib")这只是Visual C ++编译器指令。
第二个，你没有提供CMakeLists.txt，你知道吗，CLion的目标是跨平台解决方案，并为CMake的指定环境（toolchain标签）配置make文件。这意味着您无需手动调用gcc和链接库，只需target_link_libraries(myexecutable ws2_32)之后add_executable(myexecutable)即可。
第三，您不需要wsock32.lib实际链接到您的项目，除非您想要与Win95向后兼容（我确定您没有）。有关详细信息，请查看this answer。
您的顶级CMake文件应如下所示：
# system
cmake_minimum_required(VERSION 3.6)
set(CMAKE_C_STANDARD 99)
# project
project(WinsockExample C)
# sources
set(source_files
main.c
)
# build
add_executable(${CMAKE_PROJECT_NAME} ${source_files})
target_link_libraries(${CMAKE_PROJECT_NAME} ws2_32)