字符串花了很多时间读取hex文件

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问题描述

嗨

以下代码工作正常，问题是它花了超过15分钟读取数据，因为hex文件有更多2万行。有什么快速的方法吗。

2）我尝试过使用字符串生成器但是我收到了很多错误。 plz给出代码示例如何实现字符串构建器而不是字符串。

hi
the below code is working fine , the problem is that its taking more than 15 min to read data, since the hex file has more 20 thousand line. is there any fast way to do.

2) i have tried using string builder but i am getting lots of error. plz give code example how to implement string builder rather than string.

public void LoadImageSize()
        {
            openFileDialog1.Title = "Select a Hex file";
            openFileDialog1.DefaultExt = "*.hex";
            openFileDialog1.Filter = "HEX Files|*.hex";
            if (openFileDialog1.ShowDialog() != System.Windows.Forms.DialogResult.Cancel &&
               openFileDialog1.FileName.Length > 0)
            {
                richTextBox3.Text = System.IO.Path.GetFullPath(openFileDialog1.FileName);

            }
            string PathofFile = System.IO.Path.GetFullPath(openFileDialog1.FileName);
            StreamReader Sr = new StreamReader(PathofFile);
            string FileReader = Sr.ReadToEnd();
            int CountLines = File.ReadLines(PathofFile).Count();
            for (int i = 1;   i < CountLines-2; i++)
            {
                string[] lines = File.ReadAllLines(PathofFile);
                string line = lines[i];
                 using (StringReader CharReader = new StringReader(line))
                {
                    int offset = 9;
                    int length = line.Length - 11;
                    string Hexdata = line.Substring(offset, length);
                    Int64 lengthHexData = Hexdata.Length;
                    byte[] Hexintobyte = StringToByteArray(Hexdata);
                    Int64 ImageSize = Hexintobyte.Length;
                    TotalImageSize += ImageSize;

               }


             }
            Int64 SizeofDataBlock = TotalImageSize;

            Sr.Close();
            }

        //Methode for converting into 16 Byte Start
        public static byte[] StringToByteArray(String hex)
        {
            int NumberChars = hex.Length;
            byte[] bytes = new byte[NumberChars / 2];
            for (int j = 0; j < NumberChars; j += 2)
                bytes[j / 2] = Convert.ToByte(hex.Substring(j, 2), 16);
            return bytes;
        }

推荐答案

Quote：

for（int i = 1; i< CountLines-2; i ++）

{

string [] lines = File.ReadAllLines（PathofFile）;

for (int i = 1; i < CountLines-2; i++)
{
string[] lines = File.ReadAllLines(PathofFile);

您正在阅读关于 CountLines 次的整个文件。

您应该将之前的最后一行放在<$ i $ c> for 声明。

[更新]

You are reading the whole file about CountLines times.
You should put the last line before the for statement.

[update]

引用：

int offset = 9;

int length = line.Length - 11;

string Hexdata = line.Substring（offset，length）;

Int64 lengthHexData = Hexdata.Length;

byte [] Hexintobyte = StringToByteArray（Hexdata）;

Int64 ImageSize = Hexintobyte.Length;

TotalImageSize + = ImageSize;

int offset = 9;
int length = line.Length - 11;
string Hexdata = line.Substring(offset, length);
Int64 lengthHexData = Hexdata.Length;
byte[] Hexintobyte = StringToByteArray(Hexdata);
Int64 ImageSize = Hexintobyte.Length;
TotalImageSize += ImageSize;

我看着你做了很多不必要的操作。为了获得 ImageSize 值，你可以简单地写

I looks to me you are doing many unnecessary operations. In order to get ImageSize value, you could simply write

ImageSize = (line.Length - 20) / 2;

我错了吗？ br />
[/ update]

Am I wrong?
[/update]

StringBuilder  str = new StringBuilder();
str.Append();

如果它不起作用，请告诉我。

是的你需要实现以下命名空间

Do let me know if it doesn't works.

And yes you need to implement following Namespace

using System.Text;

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