[Delphi] A function that checks if a URL is valid

Source: Internet
Author: User
function Checkurl (url:string): Boolean;var  hsession, hfile, hrequest:hinternet;  Dwindex, Dwcodelen:dword;  DWCODE:ARRAY[1..20] of Char;  Res:pchar;begin  If POS ('/http ', lowercase (url)) = 0 Then    URL: = '/http ' + URL;  Result: = false;  Hsession: = InternetOpen (' ineturl:/1.0 ', internet_open_type_preconfig, nil, nil, 0);  If assigned (hsession) then  begin    Hfile: = InternetOpenUrl (hsession, Pchar (URL), nil, 0, Internet_flag_reload , 0);    Dwindex: = 0;    Dwcodelen: = ten;    HttpQueryInfo (hfile, Http_query_status_code, @dwcode, Dwcodelen, dwindex);    Res: = Pchar (@dwcode);    Result: = (res = ' n ') or (res = ' 302 ');    If assigned (hfile) then      internetclosehandle (hfile);    InternetCloseHandle (hsession);  End;end;

[Delphi] A function that checks if a URL is valid

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