C# 代码访问远程服务器共享目录

使用MS的API WNetAddConnection2A，WNetCancelConnection2A 通过用户名和密码访问不了。代码如下：
string sharePath = @"//192.168.1.1/Log";
string userName = @"test";
string psw = "test";

int status = NetworkConnection.Connect(sharePath, null, userName, psw);

调用的方法如下：
public static int Connect(string remotePath, string localPath, string username, string password)
{
NETRESOURCE[] share_driver = new NETRESOURCE[1];
share_driver[0].dwScope = RESOURCE_SCOPE.RESOURCE_GLOBALNET;
share_driver[0].dwType = RESOURCE_TYPE.RESOURCETYPE_DISK;
share_driver[0].dwDisplayType = RESOURCE_DISPLAYTYPE.RESOURCEDISPLAYTYPE_SHARE;
share_driver[0].dwUsage = RESOURCE_USAGE.RESOURCEUSAGE_ALL;
share_driver[0].lpLocalName = localPath;
share_driver[0].lpRemoteName = remotePath;

Disconnect(localPath);
int ret = WNetAddConnection2A(share_driver, password, username, 1);

return ret;
}

返回的状态为 67，实验在win7 32位机器上 vs2010，求教各路大神。