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运行环境：VS2015&Qt5.8

方法一（未能解决）：把C:\Qt\Qt5.8.0\Tools\QtCreator\bin下的libeay32.dll和ssleay32.dll库复制到C:\Qt\Qt5.8.0\5.8\msvc2015_64\bin下。

方法二（解决）：登录网站https://indy.fulgan.com/SSL/下载 openssl-1.0.2i-x64_86-win64.zip，解压后把libeay32.dll和ssleay32.dll库复制到C:\Qt\Qt5.8.0\5.8\msvc2015_64\bin下。

解决qt提示：qt.network.ssl: QSslSocket: cannot call unresolved function DH_free和qt.network.ssl: QSslSocket: cannot call unresolved function d2i_DHparams