为什么 `[DllImport]` 以 `RtlSecureZeroMemory` 的入口点失败，即使它是一个有据可查的入口点？

Question

尝试使用 kernel32 函数 SecureZeroMemory，使用下面的代码失败，System.EntryPointNotFoundException - 即使它有很好的文档记录 here, on PInvoke, and 。运行完全正常 Windows 10 Pro，在目标 .NET Framework 4.7.2 上。

        /// <summary>
        /// A kernel32 function that destroys all values in a block of memory
        /// </summary>
        /// <param name="destination">The pointer to the start of the block to be zeroed</param>
        /// <param name="length">The number of bytes to zero</param>
        /// <returns></returns>
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, EntryPoint = "RtlSecureZeroMemory")]
        public static extern void SecureZeroMemory(IntPtr destination, IntPtr length);

Answer 1

此功能已记录在案，但您包含的两个链接都不是文档。要了解发生了什么，您应该首先阅读此处的实际文档：https://msdn.microsoft.com/en-us/library/windows/desktop/aa366877(v=vs.85).aspx

它说：

This function is defined as the RtlSecureZeroMemory function (see WinBase.h). The implementation of RtlSecureZeroMemory is provided inline and can be used on any version of Windows (see WinNT.h.)

"provided inline"的意思是函数定义在头文件中，不被任何系统DLL导出。这意味着它不能被 p/invoke.

调用

为什么 `[DllImport]` 以 `RtlSecureZeroMemory` 的入口点失败，即使它是一个有据可查的入口点？

Why does `[DllImport]` fail with an entry point of `RtlSecureZeroMemory`, even though it is a well documented entry point?

c#

windows

dll

pinvoke

kernel32