Question

我是Streams的新手，在我正在开发的程序中需要从hex文件中读取数据。

文件= level.dat

我正在使用的代码：

    FileStream fs;
    private void Form1_Load(object sender, EventArgs e)
    {
        Main("PCWorld\\level.dat");
        NbtTree nbtTree = new NbtTree();
        Stream s = fs;
        Stream destStream = new MemoryStream();
        nbtTree.ReadFrom(s);
        nbtTree.WriteTo(destStream);
    }

void Main（）：

void Main(string filename)
    {
        // From MSDN Forums, slightly modified by me
        try
        {
            string fileName = filename;

            // Create random data to write to the file. 
            byte[] dataArray = new byte[100000];
            new Random().NextBytes(dataArray);

            using (FileStream
                fileStream = new FileStream(fileName, FileMode.Create))
            {
                // Write the data to the file, byte by byte. 
                for (int i = 0; i < dataArray.Length; i++)
                {
                    fileStream.WriteByte(dataArray[i]);
                }

                // Set the stream position to the beginning of the file.
                fileStream.Seek(0, SeekOrigin.Begin);

                // Read and verify the data. 
                for (int i = 0; i < fileStream.Length; i++)
                {
                    if (dataArray[i] != fileStream.ReadByte())
                    {
                        MessageBox.Show("Failed to load " + fileName + " (MCPC.dll)\n\nReason: Failed to read bytes\nResult: Close();\nSoloution: Try again and/or tell DMP9 Software", "Error");
                        Close();
                        return;
                    }
                    fs = fileStream;
                }
            }
        }
        catch (OutOfMemoryException ex)
        {
            MessageBox.Show("Failed to load NBT++.PC.exe\n\nReason: Out of memory (System.OutOfMemoryException: " + ex.Message + ")\nResult: Close();\nSoloution: Your PC Does not have enough RAM to run NBT++", "Error");
            Close();
        }
    }

我的程序有一个Substrate（https://code.google.com/p/substrate-minecraft/downloads/list）的引用，它完成了大部分工作，但是我的代码给出了 “无法访问已关闭的文件”

有任何帮助吗？感谢...

Answer 1

您的问题出在：

Stream s = fs;

fs文件流在Main方法中关闭（using语句处理文件流）。要解决此问题，您应该打开一个新的文件流来从文件中读取：

Stream s = new FileStream("PCWorld\\level.dat", FileMode.Read);

Answer 2

使用时

    using (FileStream fileStream = new FileStream(fileName, FileMode.Create))
{...}

当你走出范围时，你正在关闭这个文件流。所以你必须重新打开文件才能阅读

http://msdn.microsoft.com/en-us/library/yh598w02.aspx

System.IO.MemoryStream无法访问已关闭的文件

2 个答案: