[英]Editing a line in a text file without using pointers?
我正在尝试编辑文本行(.Hex文件),其中包含所有十六进制字符,而不使用指针,并且效率更高。
它花费了很长时间,因为我必须对该程序进行一些编辑(从hex文件的地址值中大约30x4字节或30个浮点值)。
程序每次替换一个字节时,都会搜索整个文件并替换值,然后将新文件再次复制回另一个文件。 此过程重复30次,这非常耗时,因此看起来不合适。
什么是最有效的方法?
public static string putbyteinhexfile(int address, char data, string total)
{
int temph, temphl, tempht;
ushort checksum = 0;
string output = null, hexa = null;
StreamReader hex;
RegistryKey reg = Registry.CurrentUser;
reg = reg.OpenSubKey("Software\\Calibratortest");
hex = new StreamReader(((string)reg.GetValue("Select Input Hex File")));
StreamReader map = new StreamReader((string)reg.GetValue("Select Linker Map File"));
while ((output = hex.ReadLine()) != null)
{
checksum = 0;
temph = Convert.ToInt16(("0x" + output.Substring(3, 4)), 16);
temphl = Convert.ToInt16(("0x" + output.Substring(1, 2)), 16);
tempht = Convert.ToInt16(("0x" + output.Substring(7, 2)), 16);
if (address >= temph &&
address < temph + temphl &&
tempht == 0)
{
output = output.Remove((address - temph) * 2 + 9, 2);
output = output.Insert((address - temph) * 2 + 9,
String.Format("{0:X2}", Convert.ToInt16(data)));
for (int i = 1; i < (output.Length - 1) / 2; i++)
checksum += (ushort)Convert.ToUInt16(output.Substring((i * 2) - 1, 2), 16);
hexa = ((~checksum + 1).ToString("x8")).ToUpper();
output = output.Remove(temphl * 2 + 9, 2);
output = output.Insert(temphl * 2 + 9,
hexa.Substring(hexa.Length - 2, 2));
break;
}
else total = total + output + '\r' + '\n';
}
hex.Close();
map.Close();
return total;
}
假设您不想大量重写现有的逻辑,即“针对每一行,请执行此搜索和替换逻辑”,那么我认为最简单的更改是:
var lines = File.ReadAllLines(filePath);
foreach (change to make)
{
for (int i = 0; i < lines.Length; i++)
{
// read values from line
if (need_to_modify)
{
// whatever change logic you want here.
lines[i] = lines[i].Replace(...);
}
}
}
File.WriteAllLines(filePath, lines);
基本上,您仍然会执行现在的逻辑,除了:
string fileName = "blabla.hex";
StreamReader f1 = File.OpenText(fileName);
StreamWriter f2 = File.CreateText(fileName + ".temp_");
while (!f1.EndOfStream)
{
String s = f1.ReadLine();
//change the content of the variable 's' as you wish
f2.WriteLine(s);
}
f1.Close();
f2.Close();
File.Replace(fileName + ".temp_", fileName, null);
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