我们目前面临的问题是,我们想通过使用 MonoTouch 将当前在 Android (Monodroid) 和 Wp7 上运行的应用程序移植到 IOS。
这不是问题,但是使用 protobuf-net 框架反序列化数据会不断失败,并出现以下异常:
ProtoBuf.ProtoException: Invalid wire-type; this usually means you have over-written a file without truncating or setting the length; see http://stackoverflow.com/q/2152978/23354
at ProtoBuf.ProtoReader.StartSubItem (ProtoBuf.ProtoReader reader) [0x00000] in <filename unknown>:0
at ProtoBuf.BclHelpers.ReadGuid (ProtoBuf.ProtoReader source) [0x00000] in <filename unknown>:0
at TpSerializer.Read (Application.Mobile.TpDataAccess.TimeEntryLoggingDao.Entities.ActiveTimeEntryDbo , ProtoBuf.ProtoReader ) [0x00000] in <filename unknown>:0
at TpSerializer.Deserialize (Int32 , System.Object , ProtoBuf.ProtoReader ) [0x00000] in <filename unknown>:0
at ProtoBuf.Meta.TypeModel.TryDeserializeAuxiliaryType (ProtoBuf.ProtoReader reader, DataFormat format, Int32 tag, System.Type type, System.Object& value, Boolean skipOtherFields, Boolean asListItem, Boolean autoCreate, Boolean insideList) [0x00000] in <filename unknown>:0
at ProtoBuf.Meta.TypeModel.TryDeserializeList (ProtoBuf.Meta.TypeModel model, ProtoBuf.ProtoReader reader, DataFormat format, Int32 tag, System.Type listType, System.Type itemType, System.Object& value) [0x00000] in <filename unknown>:0
at ProtoBuf.Meta.TypeModel.TryDeserializeAuxiliaryType (ProtoBuf.ProtoReader reader, DataFormat format, Int32 tag, System.Type type, System.Object& value, Boolean skipOtherFields, Boolean asListItem, Boolean autoCreate, Boolean insideList) [0x00000] in <filename unknown>:0
at ProtoBuf.Meta.TypeModel.DeserializeCore (ProtoBuf.ProtoReader reader, System.Type type, System.Object value, Boolean noAutoCreate) [0x00000] in <filename unknown>:0
at ProtoBuf.Meta.TypeModel.Deserialize (System.IO.Stream source, System.Object value, System.Type type, ProtoBuf.SerializationContext context) [0x00000] in <filename unknown>:0
at ProtoBuf.Meta.TypeModel.Deserialize (System.IO.Stream source, System.Object value, System.Type type) [0x00000] in <filename unknown>:0
at Application.Mobile.TpDataAccess.Core.CoreProtobufDao`2[System.Guid,Application.Mobile.TpDataAccess.TimeEntryDao.Entities.TimeEntryDbo].EnsureCollection () [0x00000] in <filename unknown>:0
at Application.Mobile.TpDataAccess.TimeEntryDao.TimeEntryProtobufDao.PrepareAccess () [0x00000] in <filename unknown>:0
at Application.Mobile.TpBusinessComponents.TimeEntryService.TimeEntryService.PrepareAccess () [0x00000] in <filename unknown>:0
at App.TP.Mobile.AppDelegate.FinishedLaunching (MonoTouch.UIKit.UIApplication app, MonoTouch.Foundation.NSDictionary options) [0x00031] in /Users/Developer/Dropbox/Application Mobile/Application Mobile iOS Project/Application_Mobile/AppDelegate.cs:34
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
at App.TP.Mobile.Application.Main (System.String[] args) [0x00000] in /Users/Developer/Dropbox/Application Mobile/Application Mobile iOS Project/Application_Mobile/Main.cs:17
问题是我们没有改变实体,也没有改变我们存储数据的方式。
// and serialize
string file = Path.Combine(StoragePath, dataFileName);
using (var stm = new FileStream(file, FileMode.Create))
{
foreach (var item in list)
Serializer.Serialize(stm, item);
}
不管我们读取哪个实体,它都会失败:
string file = Path.Combine(StoragePath, dataFileName);
if (!File.Exists(file))
return;
using (var stm = new FileStream(file, FileMode.Open))
{
var list = (TClass[]) Serializer.Deserialize(stm, null, typeof(TClass[]));
if (list == null)
return;
// transform array into dictionary
for (int i = 0; i < list.Length; i++)
{
var entity = list[i];
entities[primaryKeyFunction(entity)] = entity;
}
}
我们正在使用以下 Protobuf-NET 环境。
- Protobuf-net r594(统一 dll)
- 预先创建的序列化程序
保存数据不是问题,但加载失败。非常感谢任何帮助。
谢谢 - 格哈德