本文共 1116 字，大约阅读时间需要 3 分钟。

public string DoSomething(string plain, string signatureAlgorithm)        {            int nRet = 0;            IntPtr hSE = new IntPtr();            byte[] bytes = Encoding.Default.GetBytes(plain);            int length = bytes.Length;            IntPtr destination = Marshal.AllocCoTaskMem(length);            Marshal.Copy(bytes, 0, destination, bytes.Length);            int cb = 0x800;            IntPtr signature = Marshal.AllocCoTaskMem(cb);            nRet = DO_SOMETHING(hSE, destination, length, signatureAlgorithm, signature, ref cb);            if (nRet != 0)            {                throw new Exception("NOT OK!", nRet);            }            byte[] buffer2 = new byte[cb];            Marshal.Copy(signature, buffer2, 0, cb);            Marshal.FreeCoTaskMem(destination);            Marshal.FreeCoTaskMem(signature);            return Convert.ToBase64String(buffer2);        }        [DllImport("some.dll", CallingConvention = CallingConvention.Cdecl)]        public static extern int DO_SOMETHING(IntPtr hSE, IntPtr plain, int plainLen, string signmethod, IntPtr signature, ref int signatureLen);

转载地址：http://gwucn.baihongyu.com/