Author: Andrea L59044
I used FireDAC because I wanted to make a DB connection to MySQL DB.
Resource and suffix can be obtained with Request-＞PathInfo.
So decompose PathInfo into std::vector＜UnicodeString＞ and put it in.
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//// std::vector＜UnicodeString＞ __fastcall TWebModule1::path_to_vector(String path_) { std::vector＜UnicodeString＞ vector_path; std::wstringstream wss{path_.w_str()}; std::wstring path_item; while (getline(wss, path_item , L'/')) if (!path_item.empty()) { vector_path.push_back(path_item.c_str()); } return vector_path; } |
We made each resource as a member function.
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//// //resource1 void __fastcall WebModule1WebActionResource1(TObject *Sender, TWebRequest *Request, TWebResponse *Response, bool &Handled, std::vector＜UnicodeString＞& path_); //resource2 void __fastcall WebModule1WebActionResource2(TObject *Sender, TWebRequest *Request, TWebResponse *Response, bool &Handled, std::vector＜UnicodeString＞& path_); |
And I set it on the map.
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//// //This std::map is resource management. std::map＜String, TWebModuleHandlerAction>＞resource_action_{ std::make_pair( "resource1", WebModule1WebActionResource1), std::make_pair( "resource2", WebModule1WebActionResource2) }; |
Call from the main action function.
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//// void __fastcall TWebModule1::WebModule1DefaultHandlerAction(TObject *Sender, TWebRequest *Request, TWebResponse *Response, bool &Handled) { //Main function. //Convert Request-＞PathInfo to std::vector. auto v_path = path_to_vector(Request-＞PathInfo); (v_path.size() ＞ 0)? //If the resource name exists, call the function that has been registered. (resource_action_.at(*(v_path.begin())))(Sender, Request, Response, Handled, v_path): Response-＞Content = "＜html＞" "＜head＞＜title＞Web Server Application＜/title＞＜/head＞" "＜building＞Web Server Application＜/building＞" "＜/html＞"; } |
Each resource implementation part.
It is the code below.
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//// void __fastcall TWebModule1::WebModule1WebActionResource1( TObject *Sender, TWebRequest *Request, TWebResponse *Response, bool &Handled, std::vector＜UnicodeString＞& path_) { std::unique_ptr＜TJSONObject＞ jo_{std::make_unique＜TJSONObject＞()}; UnicodeString out="none"; if (path_.size() ＞ 1) { auto pos_ = StrToIntDef(path_.at(1), 0); FDQuery1-＞SQL-＞Text = Format("select * from t_MotoGP where position = %d", ARRAYOFCONST((pos_))); FDQuery1-＞Active = true; while (! FDQuery1-＞Eof) { jo_-＞AddPair("racer_name", FDQuery1-＞FieldByName("racer_name")-＞AsString); FDQuery1-＞Next(); } FDQuery1-＞Active = false; } Response-＞Content = jo_-＞ToJSON(); } void __fastcall TWebModule1::WebModule1WebActionResource2( TObject *Sender, TWebRequest *Request, TWebResponse *Response, bool &Handled, std::vector＜UnicodeString＞& path_) { std::unique_ptr＜TJSONArray＞ ja_{std::make_unique＜TJSONArray＞()}; UnicodeString out; TJSONObject* jo_; int iCount = 0; for (auto s: path_) { jo_ = new TJSONObject(); jo_-＞AddPair(Format("item_%d", ARRAYOFCONST((iCount))), s); ja_-＞AddElement(jo_); iCount++; } Response-＞Content = ja_-＞ToJSON(); } |
http://localhost:8080/resource1/1
Accessing the above URL goes through the function of WebModule1WebActionResource1.
This function connects to DB using FireDAC.
http://localhost:8080/resource2/japan/America/2017
The above URL goes through the function of WebModule1WebActionResource2.
This is just a function to echo the item.
Two resource functions are returned by JSON.
[gist]
https://gist.github.com/mojeld/63592be8f6c371116f2145b37c2a54aa
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