序列化 - 反序列化(二进制)



我正在创建一个查看器。首次转到目录时,通过处理文件、精确映像并将数据序列化为数据文件来创建数据文件。然后,我将新创建的文件反序列化为要查看的表单。第二次转到目录时,它会看到该文件尝试反序列化它以填充表单。当系统必须首先创建它时,它工作正常,但如果它已经在那里,我会收到一个未引用的对象错误。我错过了什么?

 private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            listView1.Items.Clear();
            fileInfoList.Clear();
            //fileNameList.Clear();
            ClearFlowPanel();
            TreeNode newSelected = e.Node;
            DirectoryInfo nodeDirInfo = (DirectoryInfo)newSelected.Tag;
            dirPath = nodeDirInfo.FullName;
            label_selectedPath.Text = dirPath;
            foreach (FileInfo file in nodeDirInfo.GetFiles("*.sbs", option))
            {
                if (file.Extension == ".sbs")
                {
                    fileInfoList.Add(file);
                }
            }
            foreach (FileInfo info in fileInfoList)
            {
                ListViewItem i = listView1.Items.Add(info.Name, 1);
                i.SubItems.Add(SizeInKB(info.Length));
                i.SubItems.Add(info.LastWriteTime.ToShortDateString());
            }
            listView1.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);
            string binData = dirPath + "\" + ".browser" + "\" + "_browser.bin";
            if (File.Exists(binData))
            {
                DeserializeData(binData); //creates error
            }
        }
        private void DeserializeData(string binPath)
        {
            FileStream fs = new FileStream(binPath, FileMode.Open);
            BinaryFormatter bin = new BinaryFormatter();
            int length = (int)bin.Deserialize(fs);
            MessageBox.Show(length.ToString());
            for (int i = 0; i < length; i++)
            {
                viewerData[i] = (ViewerData)bin.Deserialize(fs); //problem
            }
            for (int i = 0; i < viewerData.Length; i++)
            {
                PopulateFlowControl(viewerData[i]);
                viewerNameList.Add(viewerData[i].name);
            }
        }
        private void UpdateDirectory()
        {
            thumbPath = dirPath + "\" + ".browser";
            if (!Directory.Exists(thumbPath))
            {
                Directory.CreateDirectory(thumbPath);
            }
            fileInfoArray = fileInfoList.ToArray();
            viewerData = new ViewerData[fileInfoArray.Length];
            string binData = thumbPath + "\" + "_browser.bin";
            Stream stream = File.Open(binData, FileMode.Create);
            BinaryFormatter bin = new BinaryFormatter();
            bin.Serialize(stream, fileInfoArray.Length);
            ProgressBar_Form progressBar = new ProgressBar_Form(fileInfoArray.Length);
            progressBar.Show();
            for (int i = 0; i < fileInfoArray.Length; i++)
            {
                viewerData[i] = new ViewerData(fileInfoArray[i]);
                bin.Serialize(stream, viewerData[i]);
                progressBar.progressBar1.PerformStep();
                progressBar.label_progress.Text = "Processing : " + fileInfoArray[i].Name;
                viewerData[i].image.Dispose();
                if (File.Exists(viewerData[i].imagePath))
                {
                    File.Delete(viewerData[i].imagePath);
                }
            }
            stream.Close();
            progressBar.Close();
            DeserializeData(binData); //works fine
        }

编辑:

错误:对象引用未设置为对象的实例 - 在反序列化数据(字符串 binPath)中的第一个 for 循环中注释了"问题";

堆栈跟踪...

在 X:\Visual Studio 2010\Projects\Substance Designer\Substance_Browser_12\Substance_Browser_12\Form1.cs:line 151 中的 Substance_Browser_12.Form1.DeserializeData(String binPath) 在 X:\Visual Studio 2010\Projects\Substance Designer\Substance_Browser_12\Substance_Browser_12\Form1.cs:line 133 中的 Substance_Browser_12.Form1.treeView1_NodeMouseClick(Object sender, TreeNodeMouseClickEventArgs e) at System.Windows.Forms.TreeView.OnNodeMouseClick(TreeNodeMouseClickEventArgs e) at System.Windows.Forms.TreeView.WmNotify(Message& m) at System.Windows.Forms.TreeView.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message&m) at System.Windows.Forms.Control.WmNotify(Message& m) at System.Windows.Forms.Control.WndProc(Message&m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at System.Windows.Forms.NativeWindow.DefWndProc(Message& m) at System.Windows.Forms.Control.DefWndProc(Message& m) at System.Windows.Forms.TreeView.WmMouseDown(Message&m, MouseButton button, Int32 clicks) at System.Windows.Forms.TreeView.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at Substance_Browser_12.Program.Main() in X:\Visual Studio 2010\Projects\Substance Designer\Substance_Browser_12\Substance_Browser_12\Program.cs:line 18 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() 在System.Threading.ThreadHelper.ThreadStart_Context(对象状态) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart

()

in msdn BinaryFormatter.Deserialize Method (Stream)

若要成功反序列化,流中的当前位置必须位于对象图的开头。

因此,当您尝试反序列化流中的当前位置时,可能不会在对象图的开头。

您正在将多个 ViewerData 对象序列化为一个文件,但文件中没有这些对象的容器。我认为BinaryFormatter不支持这种用法。序列化这些对象的替代方法:

  • 为每个文件序列化一个查看器数据。
  • 将所有 ViewerData 对象添加到集合,然后序列化该集合。如果有许多大图像,则此方法可能会出现内存不足错误。
  • 开发一种将BinaryFormatter与手动写入/读取相结合的算法,以避免使用过多的内存。这可能需要一个中间流,例如 MemoryStream用于序列化每个查看器数据。请参阅下面的伪代码步骤。

将对象写入文件流的计数。
对于每个对象。 使用 BinaryFormatter 序列化为 MemoryStream。 将内存流写入文件流的长度。 将内存流写入文件流

然后执行反向操作以反序列化对象。

我需要在反序列化数据(字符串binPath)中重新初始化viewerData。如果它来自UpdateDirectory(),它已经是了。

viewerData = new ViewerData[length];

感谢大家的投入!

你只需要改成这个

private void DeserializeData(string binPath)
    {
        FileStream fs = new FileStream(binPath, FileMode.Open);
       fs.Seek(0, SeekOrigin.Begin);
        BinaryFormatter bin = new BinaryFormatter();
        int length = (int)bin.Deserialize(fs);
        MessageBox.Show(length.ToString());
        for (int i = 0; i < length; i++)
        {
            viewerData[i] = (ViewerData)bin.Deserialize(fs); //problem
        }
        for (int i = 0; i < viewerData.Length; i++)
        {
            PopulateFlowControl(viewerData[i]);
            viewerNameList.Add(viewerData[i].name);
        }
    }

public static System.IO.MemoryStream Serialize(object _Object)
{
    System.IO.MemoryStream _Return = new System.IO.MemoryStream();
    Serialize(ref _Return, _Object);
    return _Return;
}
public static void Serialize(ref System.IO.Stream Stream, object _Object)
{
    BinaryFormatter BF = new BinaryFormatter();
    BF.Serialize(Stream, _Object);
}
public static objType Deserialize<objType>(ref System.IO.Stream Stream)
{
    object _Return = null;
    Stream.Seek(0, SeekOrigin.Begin);
    BinaryFormatter BF = new BinaryFormatter();
    _Return = BF.Deserialize(Stream);
    return (objType)_Return;
}

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