如何从URL获取(提取)/设置参数? [英] How to get(extract)/set parameters from URL?
问题描述
我有这样的URL(例如):
I have URL like this (for example):
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=delphi+url+parameters+
我需要按名称( sourceid, ion,...)获取/设置参数的值。我怎样才能做到这一点?
Delphi具有TIdURI类,它有助于解析URL,但不能解析参数,它将所有参数作为单个字符串(属性Params)返回。当然我可以创建自己的解析器,但是它是如此基本的功能,应该有一些标准方法(我希望)。我很惊讶TIdURI没有它。
I need to get/set value of parameter by name ("sourceid", "ion", ...). How can i do this? Delphi has TIdURI class, it helps to parse URL but not parameters, it returns all parameters as single string (property Params). Of course i can create my own parser but it is so basic functionality, there should be some standard way (i hope). I surprised that TIdURI doesn't have it.
推荐答案
您需要先将URL解析为其组件,然后才能对其进行解码参数。
You need to parse the URL into its components first, then you can decode the parameters.
Url := 'https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=delphi+url+parameters+';
Params := TStringList.Create;
try
Params.Delimiter := '&';
Params.StrictDelimiter := true;
Uri := TIdURI.Create(Url);
try
Params.DelimitedText := Uri.Params;
finally
Uri.Free;
end;
for i := 0 to Params.Count -1 do
begin
Params.Strings[i] := StringReplace(Params.Strings[i], '+', ' ', [rfReplaceAll]);
Params.Strings[i] := TIdURI.URLDecode(Params.Strings[i], enUtf8);
end;
// use Params as needed...
finally
Params.Free;
end;
要创建新的URL,只需逆向执行以下过程:
To create a new URL, just reverse the process:
Params := TStringList.Create;
try
// fill Params as needed...
for i := 0 to Params.Count -1 do
begin
Params.Strings[i] := TIdURI.ParamsEncode(Params.Names[i], enUtf8) + '=' + TIdURI.ParamsEncode(Params.ValueFromIndex[i], enUtf8);
Params.Strings[i] := StringReplace(Params.Strings[i], ' ', '+', [rfReplaceAll]);
end;
Params.Delimiter := '&';
Params.StrictDelimiter := true;
Uri := TIdURI.Create('');
try
// fill other Uri properties as needed...
Uri.Params := Params.DelimitedText;
URL := Uri.URI;
finally
Uri.Free;
end;
finally
Params.Free;
end;
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