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作为最流行的C++密钥库，crypto++的文档并不友善

至少我找了一圈，发现最好用的还是其自带的测试

但是在我的环境，测试并不能正常运行，报异常“无法定位GetOverlappedResultEx于动态链接库kernel32.dll上”。

查看kernel32.dll，确实不存在GetOverlappedResultEx，而是有GetOverlappedResult——版本问题

在源代码中查找GetOverlappedResultEx，发现只存在于winpipes.cpp

#if defined(USE_WINDOWS8_API)
        BOOL result = GetOverlappedResultEx(h, &m_overlapped, &m_lastResult, INFINITE, FALSE);
        CheckAndHandleError("GetOverlappedResultEx", result);
#else
        BOOL result = GetOverlappedResult(h, &m_overlapped, &m_lastResult, FALSE);
        CheckAndHandleError("GetOverlappedResult", result);
#endif

USE_WINDOWS8_API宏也在这个文件

// Windows 8, Windows Server 2012, and Windows Phone 8.1 need <synchapi.h> and <ioapiset.h>
#if defined(CRYPTOPP_WIN32_AVAILABLE)
# if ((WINVER >= 0x0602 /*_WIN32_WINNT_WIN8*/) || (_WIN32_WINNT >= 0x0602 /*_WIN32_WINNT_WIN8*/))
#  include <synchapi.h>
#  include <ioapiset.h>
#  define USE_WINDOWS8_API
# endif
#endif

呵呵