在.NETMF 4.0解析RFC822，日期时间 [英] Parsing an RFC822-Datetime in .NETMF 4.0

问题描述

我已经写在.NETMF一个应用程序，需要我能够解析RFC822，日期时间。

I have an application written in .NETMF that requires that I be able to parse an RFC822-Datetime.

通常情况下，这将是容易的，但NETMF没有一个DateTime.parse（）方法，也不会有某种匹配的实施模式，所以我：M几乎卡住

Normally, this would be easy, but NETMF does not have a DateTime.parse() method, nor does it have some sort of a pattern matching implementation, so I'm pretty much stuck.

任何想法

编辑：很可能需要智能的解决方案。部分原因，这是困难的是，有问题的日期时间必须有多余的空格中（但只是有时）的倾向。一个简单的解决方案子可能工作一天，但失败时，旁边的日期时间有一个额外的空间某处部分之间。我没有在日期时间的控制，是从NOAA。

"Intelligent" solutions are probably needed. Part of the reason this is difficult is that the datetime in question has a tendency to have extra spaces in it (but only sometimes). A simple substring solution might work one day, but fail the next when the datetime has an extra space somewhere between the parts. I do not have control over the datetime, it is from the NOAA.

推荐答案

好醇'字符串操作：

Sun, 06 Jun 2010 20:07:44 +0000
          1         2         3
0123456789012345678901234567890

string x = Sanitize("  Sun,  06 \t Jun 2010 \r\n 20:07:44 +0000  ");

int day    = int.Parse(x.Substring(5, 2));
int month  = Array.IndexOf(months, x.Substring(8, 3)) + 1;
int year   = int.Parse(x.Substring(12, 4));

int hour   = int.Parse(x.Substring(17, 2));
int minute = int.Parse(x.Substring(20, 2));
int second = int.Parse(x.Substring(23, 2));

int offsetSgn    = (x[26] == "-") ? -1 : 1;
int offsetHour   = int.Parse(x.Substring(27, 2));
int offsetMinute = int.Parse(x.Substring(29, 2));

DateTime result = new DateTime(year, month, day, hour, minute, second, 0);
TimeSpan offset = new TimeSpan(offsetHour, offsetMinute, 0);

// TODO: add offset...

与

with

string[] months = new string[12];
months[0] = "Jan";
months[1] = "Feb";
months[2] = "Mar";
months[3] = "Apr";
months[4] = "May";
months[5] = "Jun";
months[6] = "Jul";
months[7] = "Aug";
months[8] = "Sep";
months[9] = "Oct";
months[10] = "Nov";
months[11] = "Dec";

和

string Sanitize(string s)
{
    if (s == null)
    {
        return null;
    }

    char[] buffer = new char[s.Length];
    int pos = 0;
    bool inSpace = true;

    for (int i = 0; i < s.Length; i++)
    {
        if (s[i] == ' ' || s[i] == '\t' || s[i] == '\r' || s[i] == '\n')
        {
            if (!inSpace)
            {
                buffer[pos] = ' ';
                pos++;
                inSpace = true;
            }
        }
        else
        {
            buffer[pos] = s[i];
            pos++;
            inSpace = false;
        }
    }

    return new string(buffer, 0, pos);
}

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