[DllImport(@".\DLL.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr 函数名();
IntPtr ptr = 函数名();
string result = Marshal.PtrToStringAnsi(ptr);
[DllImport(@".\DLL.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr 函数名();
IntPtr ptr = 函数名();
string result = Marshal.PtrToStringAnsi(ptr);