This takes three parameters: the context pointer, the path and the filename of the trust store file, and a path to a directory of certificates.
这里要用到三个参数：上下文指针、可信任库文件的路径和文件名，以及证书所在目录的路径。
If you are going to use a directory to store the trust store, the files must be named in a certain way.
如果打算使用目录存储可信任库，那么必须要以特定的方式命名文件。
One of either the trust store file or directory of certificates must be specified.
必须指定可信任库文件或证书的目录。
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