QT SSL QSslSocket: cannot call unresolved function SSLv23_client_method

今天在QT项目中，需要用到和https协议来访问服务器，然而在调用服务器时却发现程序运行时，QT控制台报错如下：

qt.network.ssl: QSslSocket: cannot call unresolved function SSLv23_client_method 
qt.network.ssl: QSslSocket: cannot call unresolved function SSL_CTX_new 
qt.network.ssl: QSslSocket: cannot call unresolved function SSL_library_init 
qt.network.ssl: QSslSocket: cannot call unresolved function ERR_get_error 
qt.network.ssl: QSslSocket: cannot call unresolved function ERR_get_error

查了一下发现遇到此类问题的人还是蛮多的。解决方法很简单：

1. 在ssl官网下载安装包，运行安装。

2. 在安装目录找到libeay32.dll和ssleay32.dll，将其拷贝到exe的运行目录，或者xxx\Qt5.4.2\5.4\mingw491_32\bin(其中xxx为QT的安装目录）.

参考：

Qt 5.4错误"qt.network.ssl: QSslSocket: cannot call"

Qt 之 使用 https:// 发送 HTTP请求