WNetAddConnection2返回错误1200 - 本地名称有效

Question

我正在尝试将共享(假设为\ server\folder)连接到我的本地设备X:

[DllImport("Mpr.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern int WNetAddConnection2(
            [In] NetResource lpNetResource,
            string lpPassword,
            string lpUsername,
            int flags
        );

public static bool Connect(string remoteName, string localName, bool persistent) {
            if (!IsLocalPathValid(localName)) return false;
            var r = new NetResource
            {
                dwScope = ResourceScope.RESOURCE_GLOBALNET,
                dwType = ResourceType.RESOURCETYPE_ANY,
                dwDisplayType = ResourceDisplayType.RESOURCEDISPLAYTYPE_SHARE,
                dwUsage = ResourceUsage.RESOURCEUSAGE_CONNECTABLE,
                lpRemoteName = remoteName,
                lpLocalName = localName
            };
            return WNetAddConnection2(r, null, null, persistent ? 1 : 0) == 0;
        }

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

打电话的时候

Connect(@"\\server\folder", "X:", true);

函数只返回false - 错误说1200(BAD_DEVICE).NetResource看起来像这样:

lpRemoteName = "\\\\server\\folder"; 
lpProvider = null;
lpLocalName = "X:";
lpComment = null;
dwUsage = Connectable; 
dwType = Any; 
dwScope = GlobalNet; 
dwDisplayType = Share;

我已经检查了几个片段(PInvoke)把我看不出任何区别.也许你可以解开这个谜......

EDIT1

Answer 1

[StructLayout(LayoutKind.Sequential)]

这就是问题开始的地方，属性没有指定CharSet属性。默认值是 CharSet.Ansi，这是一个令人困惑的选择，需要乘坐时光机才能理解，带您回到 1998 年。因此，代码将一个带有字符串的结构体传递给一个函数，该字符串被转换为 8 位字符明确使用该函数的 Unicode 风格。实施过程中不可避免地会出现垃圾。

您可以使用 [MarshalAs] 强制对每个单独的字符串成员进行封送。但使字符类型匹配更简单、更符合逻辑。使固定：

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]