我想提取从HTTP请求中收到的POST参数,该请求已发送到我的NodeMCU。我怎么能做到这一点?我在考虑C#中的以下代码。如何在Lua中实现这个?
我在C#中的代码:
// Response = "<action>Play</action><speed>1</speed><blah>lol</blah>"
// ValuetoSearch = "action"
public static string GetInformationFromResponse(string Response, string ValueToSearch, bool RemoveHtmlCharacters = true) {
string returnValue = "";
if (RemoveHtmlCharacters) {
Response = Response.Replace("<" + ValueToSearch + ">", ValueToSearch);
Response = Response.Replace("</" + ValueToSearch + ">", ValueToSearch);
Response = Response.Replace("<" + ValueToSearch + ">", ValueToSearch);
Response = Response.Replace("</" + ValueToSearch + ">", ValueToSearch);
}
// Response = "actionPlayaction<Speed>1</Speed><blah>lol</blah>"
int indexOfWord = Response.IndexOf(ValueToSearch); // indexOfWord = 0
int start = indexOfWord + ValueToSearch.Length; // start = 6
int end = Response.Length - indexOfWord - 1; // 47
int totalLength = Response.Length; // 48
string newPositionInfo = "";
if (indexOfWord == -1) {
return "";
} else {
newPositionInfo = Response.Substring(start, totalLength - start); // newPositionInfo = "Playaction<Speed>1</Speed><blah>lol</blah>"
indexOfWord = newPositionInfo.IndexOf(ValueToSearch); // indexOfWord = 4
returnValue = newPositionInfo.Substring(0, indexOfWord); // returnValue = "Play"
if (RemoveHtmlCharacters) {
returnValue = returnValue.Replace("<", "");
returnValue = returnValue.Replace(">", "");
returnValue = returnValue.Replace("&", "");
}
return returnValue; // "Play"
}
}
此代码的用法如下: - 我希望获得“#34; action&#34;”之间的所有内容。 - 我有一个包含单词&#34; action&#34;。
的文字string largeText = "<action>Play</action><speed>1</speed><blah>blah</blah>"
string wordToSearch = "action"
string value1 = GetInformationFromResponse(largeText, "action");
string value2 = GetInformationFromResponse(largeText, "speed");
string value3 = GetInformationFromResponse(largeText, "blah");
// Value 1 = "Play"
// Value 2 = "1"
// Value 3 = "blah"
但是我如何在Lua(在我的NodeMCU上)完成同样的事情?
注意:Lua和NodeMCU上的新手
答案 0 :(得分:0)
function GetInformationFromResponse(response, tag)
return
((response:match((("<@>(.-)</@>"):gsub("@",tag))) or "")
:gsub("&(%w+);", {lt = "<", gt = ">", amp = "&"}))
end
local text = "<action>Play</action><speed>1</speed><blah>blah&blah</blah>"
local value1 = GetInformationFromResponse(text, "action"); -- "Play"
local value2 = GetInformationFromResponse(text, "speed"); -- "1"
local value3 = GetInformationFromResponse(text, "blah"); -- "blah&blah"
local value4 = GetInformationFromResponse(text, "foo"); -- ""
答案 1 :(得分:0)
以下是一些可以执行此操作的功能:
function get_text (str, init, term)
local _, start = string.find(str, init)
local stop = string.find(str, term)
local result = nil
if _ and stop then
result = string.sub(str, start + 1, stop - 1)
end
return result
end
function get_tagged (str, tag)
local open_tag = "<" .. tag ..">"
local close_tag = "</" .. tag .. ">"
local _, start = string.find(str, open_tag)
local stop = string.find(str, close_tag)
local result = nil
if _ and stop then
result = string.sub(str, start + 1, stop - 1)
end
return result
end
示例互动:
> largeText = "<action>Play</action><speed>1</speed><blah>blah</blah>"
> -- Using get_text()
> print(get_text(largeText, "<action>", "</action>"))
Play
> -- Using get_tagged()
> print(get_tagged(largeText, "action"))
Play
> print(get_tagged(largeText, "speed"))
1
> print(get_tagged(largeText, "blah"))
blah
> print(get_tagged(largeText, "oops"))
nil