Download from SourceForge/pl: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Download from SourceForge/pl
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| 1 | + | <div style="font-size:1.88em;margin:0.75em 0;"> | |
| 2 | + | ||
| 3 | + | Pobieranie z SourceForge | |
| 4 | + | ||
| 5 | + | </div> | |
| 6 | + | ||
| 7 | + | Możesz użyć biblioteki sieciowej [[Synapse]] do pobierania plików z SourceForge. Ponieważ SourceForge przechowuje pliki na wielu serwerach lustrzanych, musisz poradzić sobie z przekierowaniami. | |
| 8 | + | ||
| 9 | + | ``` pascal | |
| 10 | + | ... | |
| 11 | + | uses httpsend {moduł Synapse} | |
| 12 | + | ... | |
| 13 | + | function DownloadHTTPStream(URL: string; Buffer: TStream): boolean; | |
| 14 | + | // Pobieranie pliku; w razie potrzeby próbuje ponownie. | |
| 15 | + | const | |
| 16 | + | MaxRetries = 3; | |
| 17 | + | var | |
| 18 | + | RetryAttempt: integer; | |
| 19 | + | HTTPGetResult: boolean; | |
| 20 | + | begin | |
| 21 | + | Result:=false; | |
| 22 | + | RetryAttempt := 1; | |
| 23 | + | HTTPGetResult := False; | |
| 24 | + | while ((HTTPGetResult = False) and (RetryAttempt < MaxRetries)) do | |
| 25 | + | begin | |
| 26 | + | HTTPGetResult := HttpGetBinary(URL, Buffer); | |
| 27 | + | //Application.ProcessMessages; | |
| 28 | + | Sleep(100 * RetryAttempt); | |
| 29 | + | RetryAttempt := RetryAttempt + 1; | |
| 30 | + | end; | |
| 31 | + | if HTTPGetResult = False then | |
| 32 | + | raise Exception.Create('Nie można załadować dokumentu ze zdalnego serwera'); | |
| 33 | + | Buffer.Position := 0; | |
| 34 | + | if Buffer.Size = 0 then | |
| 35 | + | raise Exception.Create('Pobrany dokument jest pusty.'); | |
| 36 | + | Result := True; | |
| 37 | + | end; | |
| 38 | + | ||
| 39 | + | function SFDirectLinkURL(URL: string; Document: TMemoryStream): string; | |
| 40 | + | { | |
| 41 | + | Przekształć tę część dokumentu: | |
| 42 | + | <noscript> | |
| 43 | + | <meta http-equiv="refresh" content="5; url=http://downloads.sourceforge.net/project/base64decoder/base64decoder/version%202.0/b64util.zip?r=&ts=1329648745&use_mirror=kent"> | |
| 44 | + | </noscript> | |
| 45 | + | na poprawny adres URL: | |
| 46 | + | http://downloads.sourceforge.net/project/base64decoder/base64decoder/version%202.0/b64util.zip?r=&ts=1329648745&use_mirror=kent | |
| 47 | + | } | |
| 48 | + | const | |
| 49 | + | Refresh='<meta http-equiv="refresh"'; | |
| 50 | + | URLMarker='url='; | |
| 51 | + | var | |
| 52 | + | Counter: integer; | |
| 53 | + | HTMLBody: TStringList; | |
| 54 | + | RefreshStart: integer; | |
| 55 | + | URLStart: integer; | |
| 56 | + | begin | |
| 57 | + | HTMLBody:=TStringList.Create; | |
| 58 | + | try | |
| 59 | + | HTMLBody.LoadFromStream(Document); | |
| 60 | + | for Counter:=0 to HTMLBody.Count-1 do | |
| 61 | + | begin | |
| 62 | + | // Ta linia powinna znajdować się między tagami noscript i podawać bezpośrednią lokalizację pobierania: | |
| 63 | + | RefreshStart:=Ansipos(Refresh, HTMLBody[Counter]); | |
| 64 | + | if RefreshStart>0 then | |
| 65 | + | begin | |
| 66 | + | URLStart:=AnsiPos(URLMarker, HTMLBody[Counter])+Length(URLMarker); | |
| 67 | + | if URLStart>RefreshStart then | |
| 68 | + | begin | |
| 69 | + | // Znajdź cudzysłów zamykający " | |
| 70 | + | URL:=Copy(HTMLBody[Counter], | |
| 71 | + | URLStart, | |
| 72 | + | PosEx('"',HTMLBody[Counter],URLStart+1)-URLStart); | |
| 73 | + | infoln('debug: nowy adres URL po tagu noscript:'); | |
| 74 | + | infoln(URL); | |
| 75 | + | break; | |
| 76 | + | end; | |
| 77 | + | end; | |
| 78 | + | end; | |
| 79 | + | finally | |
| 80 | + | HTMLBody.Free; | |
| 81 | + | end; | |
| 82 | + | result:=URL; | |
| 83 | + | end; | |
| 84 | + | ||
| 85 | + | function SourceForgeURL(URL: string): string; | |
| 86 | + | // Wykrywa pobieranie z sourceforge i próbuje poradzić sobie | |
| 87 | + | // z przekierowaniami i wyodrębnieniem bezpośredniego linku do pobrania. | |
| 88 | + | // Dziękuję | |
| 89 | + | // Ocye: http://lazarus.freepascal.org/index.php/topic,13425.msg70575.html#msg70575 | |
| 90 | + | ||
| 91 | + | const | |
| 92 | + | SFProjectPart = '//sourceforge.net/projects/'; | |
| 93 | + | SFFilesPart = '/files/'; | |
| 94 | + | SFDownloadPart ='/download'; | |
| 95 | + | var | |
| 96 | + | HTTPSender: THTTPSend; | |
| 97 | + | i, j: integer; | |
| 98 | + | FoundCorrectURL: boolean; | |
| 99 | + | SFDirectory: string; //Katalog Sourceforge | |
| 100 | + | SFDirectoryBegin: integer; | |
| 101 | + | SFFileBegin: integer; | |
| 102 | + | SFFilename: string; //Nazwa pliku Sourceforge | |
| 103 | + | SFProject: string; | |
| 104 | + | SFProjectBegin: integer; | |
| 105 | + | begin | |
| 106 | + | // Wykryj pobieranie SourceForge; np. z adresu URL | |
| 107 | + | // 1 2 3 4 5 6 7 8 9 | |
| 108 | + | // 1234557890123456789012345578901234567890123455789012345678901234557890123456789012345578901234567890 | |
| 109 | + | // http://sourceforge.net/projects/base64decoder/files/base64decoder/version%202.0/b64util.zip/download | |
| 110 | + | // ^^^projekt^^^ ^^^katalog..............^^^ ^^^plik^^^ | |
| 111 | + | FoundCorrectURL:=true; //Załóżmy, że nie jest to pobieranie z SourceForge | |
| 112 | + | i:=Pos(SFProjectPart, URL); | |
| 113 | + | if i>0 then | |
| 114 | + | begin | |
| 115 | + | // Ewentualnie znaleziony projekt; teraz wyodrębnij części projektu, katalogu i nazwy pliku. | |
| 116 | + | SFProjectBegin:=i+Length(SFProjectPart); | |
| 117 | + | j := PosEx(SFFilesPart, URL, SFProjectBegin); | |
| 118 | + | if (j>0) then | |
| 119 | + | begin | |
| 120 | + | SFProject:=Copy(URL, SFProjectBegin, j-SFProjectBegin); | |
| 121 | + | SFDirectoryBegin:=PosEx(SFFilesPart, URL, SFProjectBegin)+Length(SFFilesPart); | |
| 122 | + | if SFDirectoryBegin>0 then | |
| 123 | + | begin | |
| 124 | + | // Znajdź plik | |
| 125 | + | // URL może mieć końcowe argumenty... więc: wyszukaj pierwszą | |
| 126 | + | // napotkaną nazwę z prawej strony, ale powinna być po /files/ | |
| 127 | + | i:=RPos(SFDownloadPart, URL); | |
| 128 | + | // Teraz poszukaj poprzedni ukośnik /, abyśmy mogli rozpoznać plik. | |
| 129 | + | // Może to być końcowy / w /files/ | |
| 130 | + | SFFileBegin:=RPosEx('/',URL,i-1)+1; | |
| 131 | + | ||
| 132 | + | if SFFileBegin>0 then | |
| 133 | + | begin | |
| 134 | + | SFFilename:=Copy(URL,SFFileBegin, i-SFFileBegin); | |
| 135 | + | //Uwzględnij końcowy ukośnik / | |
| 136 | + | SFDirectory:=Copy(URL, SFDirectoryBegin, SFFileBegin-SFDirectoryBegin); | |
| 137 | + | FoundCorrectURL:=false; | |
| 138 | + | end; | |
| 139 | + | end; | |
| 140 | + | end; | |
| 141 | + | end; | |
| 142 | + | ||
| 143 | + | if not FoundCorrectURL then | |
| 144 | + | begin | |
| 145 | + | try | |
| 146 | + | // Przepisz adres URL, jeśli jest to konieczne do przekierowania pobierania Sourceforge | |
| 147 | + | // Wykryj bezpośredni link w treści HTML i uzyskaj z niego adres URL | |
| 148 | + | HTTPSender := THTTPSend.Create; | |
| 149 | + | //Kto wie, może to pomóc: | |
| 150 | + | HTTPSender.UserAgent:='curl/7.21.0 (i686-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.18'; | |
| 151 | + | while not FoundCorrectURL do | |
| 152 | + | begin | |
| 153 | + | HTTPSender.HTTPMethod('GET', URL); | |
| 154 | + | infoln('debug: headers:'); | |
| 155 | + | infoln(HTTPSender.Headers.Text); | |
| 156 | + | case HTTPSender.Resultcode of | |
| 157 | + | 301, 302, 307: | |
| 158 | + | begin | |
| 159 | + | for i := 0 to HTTPSender.Headers.Count - 1 do | |
| 160 | + | if (Pos('Location: ', HTTPSender.Headers.Strings[i]) > 0) or | |
| 161 | + | (Pos('location: ', HTTPSender.Headers.Strings[i]) > 0) then | |
| 162 | + | begin | |
| 163 | + | j := Pos('use_mirror=', HTTPSender.Headers.Strings[i]); | |
| 164 | + | if j > 0 then | |
| 165 | + | URL := | |
| 166 | + | 'http://' + RightStr(HTTPSender.Headers.Strings[i], | |
| 167 | + | length(HTTPSender.Headers.Strings[i]) - j - 10) + | |
| 168 | + | '.dl.sourceforge.net/project/' + | |
| 169 | + | SFProject + '/' + SFDirectory + SFFilename | |
| 170 | + | else | |
| 171 | + | URL:=StringReplace( | |
| 172 | + | HTTPSender.Headers.Strings[i], 'Location: ', '', []); | |
| 173 | + | HTTPSender.Clear;//httpsend | |
| 174 | + | FoundCorrectURL:=true; | |
| 175 | + | break; // opuść pętlę przepisywania | |
| 176 | + | end; | |
| 177 | + | end; | |
| 178 | + | 100..200: | |
| 179 | + | begin | |
| 180 | + | //Pobierz stronę sourceforge z bezpośredniego linku | |
| 181 | + | URL:=SFDirectLinkURL(URL, HTTPSender.Document); //Zapytaj | |
| 182 | + | FoundCorrectURL:=true; //Już skończyliśmy | |
| 183 | + | end; | |
| 184 | + | 500: raise Exception.Create('Brak połączenia internetowego'); | |
| 185 | + | //Internal Server Error ('+aURL+')'); | |
| 186 | + | else | |
| 187 | + | raise Exception.Create('Pobieranie nie powiodło się. Kod błędu ' + | |
| 188 | + | IntToStr(HTTPSender.ResultCode) + ' (' + HTTPSender.ResultString + ')'); | |
| 189 | + | end;//case | |
| 190 | + | end;//while | |
| 191 | + | infoln('debug: wynikowy adres URL po przekierowaniu sf: *' + URL + '*'); | |
| 192 | + | finally | |
| 193 | + | HTTPSender.Free; | |
| 194 | + | end; | |
| 195 | + | end; | |
| 196 | + | result:=URL; | |
| 197 | + | end; | |
| 198 | + | ``` | |
| 199 | + | ||
| 200 | + | Następnie możesz pobrać plik standardową metodą. | |
| 201 | + | ||
| 202 | + | ``` pascal | |
| 203 | + | ... | |
| 204 | + | function DownloadHTTP(URL, TargetFile: string): boolean; | |
| 205 | + | // Pobieranie pliku; w razie potrzeby spróbuj ponownie. | |
| 206 | + | // Oferty z linkami do pobierania SourceForge | |
| 207 | + | var | |
| 208 | + | Buffer: TMemoryStream; | |
| 209 | + | begin | |
| 210 | + | result:=false; | |
| 211 | + | URL:=SourceForgeURL(URL); //Zajmij się adresami URL Sourceforge | |
| 212 | + | try | |
| 213 | + | Buffer := TMemoryStream.Create; | |
| 214 | + | DownloadHTTPStream(URL, Buffer); | |
| 215 | + | Buffer.SaveToFile(TargetFile); | |
| 216 | + | result:=true; | |
| 217 | + | finally | |
| 218 | + | FreeAndNil(Buffer); | |
| 219 | + | end; | |
| 220 | + | end; | |
| 221 | + | ``` | |
| 222 | + | ||
| 223 | + | ## Zobacz także | |
| 224 | + | ||
| 225 | + | - [[Synapse/pl|Synapse]] | |
| 226 | + | ||
| 227 | + | --- | |
| 228 | + | *From the Free Pascal wiki, page "Download from SourceForge/pl", as it stood on 2022-07-06 after a change by Slawek, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* |
