使用 NuGet 包在 C++ 项目中引用 libssh2 会引发链接器错误

Question

我正在考虑将 libssh2 库用于我正在使用 C++ 进行的项目。在我在我的主应用程序中正确实施它之前，我已经创建了一个非常基本的项目来测试它。

我从 https://www.libssh2.org/examples/direct_tcpip.html 中获取了一个示例，并在 Visual Studio 2015 年使用 NuGet 包管理器安装了 libssh2 库。

我有以下代码

#include <libssh2.h>
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>

using namespace std;

const char *username = "user";
const char *password = "password";
const char *server_ip = "127.0.0.1";
const char *local_listenIP = "127.0.0.1";
unsigned int local_listenport = 2222;
const char *remote_desthost = "127.0.0.1";
unsigned int remote_destport = 22;
enum {
    AUTH_NONE = 0,
    AUTH_PASSWORD,
    AUTH_PUBLICKEY
};

int main()
{
    int rc, i, auth = AUTH_NONE;

    struct sockaddr_in sin;
    socklen_t sinlen;
    const char *fingerprint;
    char *userauthlist;
    LIBSSH2_SESSION *session;
    LIBSSH2_CHANNEL *channel = NULL;
    const char *shost;
    unsigned int sport;
    fd_set fds;
    struct  timeval tv;
    ssize_t len, wr;
    char buf[16384];
    char sockopt;
    SOCKET sock = INVALID_SOCKET;
    SOCKET listenSocket = INVALID_SOCKET, forward_socket = INVALID_SOCKET;
    WSADATA wsadata;
    int err;

    err = WSAStartup(MAKEWORD(2, 0), &wsadata);
    if (err != 0)
    {
        cout << "WSAStartup failed with error " << err << " Msg: " << strerror(err) << endl;
        return EXIT_FAILURE;
    }
rc = libssh2_init(0);
    if (rc != 0)
    {
        cout << "Failed to init libssh2. Error " << rc << " Msg: " << strerror(err) << endl;
        return EXIT_FAILURE;
    }

编译时出现以下错误：

Unresolved external symbol libssh2_init referenced in function main
Unresolved external symbol _imp_WSAStartup referenced in function main

Answer 1

对于第一个错误，我同意harmic，您可以手动将.lib文件添加到您的项目中以解决库link失败：添加.lib文件：Properties>Linker->Input-> Additional Dependencies，添加.lib文件路径：Properties>Linker->General->Additional Dependencies.

对于第二个错误，问题是您没有link针对Ws2_32.lib 库。要解决此问题，您可以将以下代码添加到项目的源文件中。

#pragma comment(lib, "Ws2_32.lib")

使用 NuGet 包在 C++ 项目中引用 libssh2 会引发链接器错误

Referencing libssh2 in C++ project using NuGet package throws a linker error

c++

nuget

libssh2

visual-studio-2015