Windows服务程序访问NAS

由于服务程序授权与用户桌面授权互不影响，所以即使在用户桌面映射了NAS盘符，在Windows服务程序下仍然是不可以访问的。

一般来说有这样几种做法来访问NAS或共享盘：
1、加入域，通过“域用户认证”或“通过将NAS资源设置对某台计算机授权”来达到访问NAS的目的
2、不加域，在Windows中添加与NAS相同的用户名及密码，服务程序通过该用户名密码登录，可以访问NAS
3、不加域，通过调阅API的方式来获得访问NAS的权限
A、VC实现如下：

DWORD AcessNetDrtive(TCHAR* szRemotePath, TCHAR* szLocalDriver,  const TCHAR* szUsername, const TCHAR* szPassword)
{
	DWORD dwRetVal;
	DWORD dwFlags;

	NETRESOURCE nr;
	memset(&nr, 0, sizeof(NETRESOURCE));
	nr.dwScope = RESOURCE_GLOBALNET;
	nr.dwType = RESOURCETYPE_ANY;
	nr.lpLocalName = szLocalDriver;
	nr.lpRemoteName = szRemotePath;
	nr.lpProvider = NULL;

	//CONNECT_REDIRECT;CONNECT_UPDATE_PROFILE;
	dwFlags = 0;
	dwRetVal = WNetAddConnection2(&nr, szPassword, szUsername, dwFlags);

	retrun dwRetVal;
}

B、C#实现如下：

    public class NetworkDrive
    {
        public enum ResourceScope
        {
            RESOURCE_CONNECTED = 1,
            RESOURCE_GLOBALNET,
            RESOURCE_REMEMBERED,
            RESOURCE_RECENT,
            RESOURCE_CONTEXT
        }

        public enum ResourceType
        {
            RESOURCETYPE_ANY,
            RESOURCETYPE_DISK,
            RESOURCETYPE_PRINT,
            RESOURCETYPE_RESERVED
        }

        public enum ResourceUsage
        {
            RESOURCEUSAGE_CONNECTABLE = 0x00000001,
            RESOURCEUSAGE_CONTAINER = 0x00000002,
            RESOURCEUSAGE_NOLOCALDEVICE = 0x00000004,
            RESOURCEUSAGE_SIBLING = 0x00000008,
            RESOURCEUSAGE_ATTACHED = 0x00000010,
            RESOURCEUSAGE_ALL = (RESOURCEUSAGE_CONNECTABLE | RESOURCEUSAGE_CONTAINER | RESOURCEUSAGE_ATTACHED),
        }

        public enum ResourceDisplayType
        {
            RESOURCEDISPLAYTYPE_GENERIC,
            RESOURCEDISPLAYTYPE_DOMAIN,
            RESOURCEDISPLAYTYPE_SERVER,
            RESOURCEDISPLAYTYPE_SHARE,
            RESOURCEDISPLAYTYPE_FILE,
            RESOURCEDISPLAYTYPE_GROUP,
            RESOURCEDISPLAYTYPE_NETWORK,
            RESOURCEDISPLAYTYPE_ROOT,
            RESOURCEDISPLAYTYPE_SHAREADMIN,
            RESOURCEDISPLAYTYPE_DIRECTORY,
            RESOURCEDISPLAYTYPE_TREE,
            RESOURCEDISPLAYTYPE_NDSCONTAINER
        }

        [StructLayout(LayoutKind.Sequential)]
        private class NETRESOURCE
        {
            public ResourceScope dwScope = 0;
            public ResourceType dwType = 0;
            public ResourceDisplayType dwDisplayType = 0;
            public ResourceUsage dwUsage = 0;
            public string lpLocalName = null;
            public string lpRemoteName = null;
            public string lpComment = null;
            public string lpProvider = null;
        }

        [DllImport("mpr.dll")]
        private static extern int WNetAddConnection2(NETRESOURCE lpNetResource, string lpPassword, string lpUsername, int dwFlags);

        public static int MapNetworkDrive(string remotePath, string localDrive, string userName, string passWord)
        {
            NETRESOURCE myNetResource = new NETRESOURCE();
            myNetResource.lpLocalName = localDrive;
            myNetResource.lpRemoteName = remotePath;
            myNetResource.lpProvider = null;
            int result = WNetAddConnection2(myNetResource, passWord, userName, 0);
            return result;
        }
    }