如果不用此字符串，那么所捕捉到的仅仅是正确的信息，错误信息会被忽略。
If you do not use this string, then you will be capturing only the good messages, and the error messages will not be captured.
dlerror以字符串的形式返回任何错误，这些错误信息字符串描述dl函数碰到的最后一个错误。
Any errors are returned in strings, by dlerror, which describe the last error encountered by a dl function.
字符串转换：架构验证失败；参见扩展错误信息。
String Transform: Schema validation failed; see Extended Error information.
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