src/msw/urlmsw.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/urlmsw.cpp
   3 // Purpose:     MS-Windows native URL support based on WinINet
   4 // Author:      Hajo Kirchhoff
   5 // Modified by:
   6 // Created:     06/11/2003
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Hajo Kirchhoff
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_URL_NATIVE
  20
  21 #if !wxUSE_PROTOCOL_HTTP
  22 #include <wx/protocol/protocol.h>
  23
  24 // empty http protocol replacement (for now)
  25 // so that wxUSE_URL_NATIVE can be used with
  26 // wxSOCKETS==0 and wxUSE_PROTOCOL_HTTP==0
  27 class wxHTTPDummyProto : public wxProtocol
  28 {
  29 public:
  30     wxHTTPDummyProto() : wxProtocol() { }
  31
  32     wxProtocolError GetError() { return m_error; }
  33
  34     virtual bool Abort() { return true; }
  35
  36     wxInputStream *GetInputStream(const wxString& WXUNUSED(path))
  37     {
  38         return 0;   // input stream is returned by wxURLNativeImp
  39     }
  40
  41 protected:
  42     wxProtocolError m_error;
  43
  44     DECLARE_DYNAMIC_CLASS_NO_COPY(wxHTTPDummyProto)
  45     DECLARE_PROTOCOL(wxHTTPDummyProto)
  46 };
  47
  48 // the only "reason for being" for this class is to tell
  49 // wxURL that there is someone dealing with the http protocol
  50 IMPLEMENT_DYNAMIC_CLASS(wxHTTPDummyProto, wxProtocol)
  51 IMPLEMENT_PROTOCOL(wxHTTPDummyProto, wxT("http"), NULL, FALSE)
  52 USE_PROTOCOL(wxHTTPDummyProto)
  53
  54 #endif // !wxUSE_PROTOCOL_HTTP
  55
  56
  57 #ifdef __VISUALC__  // be conservative about this pragma
  58     // tell the linker to include wininet.lib automatically
  59     #pragma comment(lib, "wininet.lib")
  60 #endif
  61
  62 #include "wx/string.h"
  63 #include "wx/list.h"
  64 #include "wx/utils.h"
  65 #include "wx/module.h"
  66 #include "wx/url.h"
  67
  68 #include <string.h>
  69 #include <ctype.h>
  70 #include <wininet.h>
  71
  72 // this class needn't be exported
  73 class wxWinINetURL:public wxURLNativeImp
  74 {
  75 public:
  76     wxInputStream *GetInputStream(wxURL *owner);
  77
  78 protected:
  79     // return the WinINet session handle
  80     static HINTERNET GetSessionHandle();
  81 };
  82
  83 HINTERNET wxWinINetURL::GetSessionHandle()
  84 {
  85     // this struct ensures that the session is opened when the
  86     // first call to GetSessionHandle is made
  87     // it also ensures that the session is closed when the program
  88     // terminates
  89     static struct INetSession
  90     {
  91         INetSession()
  92         {
  93             DWORD rc = InternetAttemptConnect(0);
  94
  95             m_handle = InternetOpen
  96                        (
  97                         wxVERSION_STRING,
  98                         INTERNET_OPEN_TYPE_PRECONFIG,
  99                         NULL,
 100                         NULL,
 101                         rc == ERROR_SUCCESS ? 0 : INTERNET_FLAG_OFFLINE
 102                        );
 103         }
 104
 105         ~INetSession()
 106         {
 107             InternetCloseHandle(m_handle);
 108         }
 109
 110         HINTERNET m_handle;
 111     } session;
 112
 113    return session.m_handle;
 114 }
 115
 116 // this class needn't be exported
 117 class /*WXDLLIMPEXP_NET */ wxWinINetInputStream : public wxInputStream
 118 {
 119 public:
 120     wxWinINetInputStream(HINTERNET hFile=0);
 121     ~wxWinINetInputStream();
 122
 123     void Attach(HINTERNET hFile);
 124
 125     off_t SeekI( off_t WXUNUSED(pos), wxSeekMode WXUNUSED(mode) )
 126         { return -1; }
 127     off_t TellI() const
 128         { return -1; }
 129
 130 protected:
 131     void SetError(wxStreamError err) { m_lasterror=err; }
 132     HINTERNET m_hFile;
 133     size_t OnSysRead(void *buffer, size_t bufsize);
 134
 135     DECLARE_NO_COPY_CLASS(wxWinINetInputStream)
 136 };
 137
 138 size_t wxWinINetInputStream::OnSysRead(void *buffer, size_t bufsize)
 139 {
 140     DWORD bytesread = 0;
 141     if ( !InternetReadFile(m_hFile, buffer, bufsize, &bytesread) )
 142     {
 143         DWORD lError = ::GetLastError();
 144         if ( lError != ERROR_SUCCESS )
 145             SetError(wxSTREAM_READ_ERROR);
 146
 147         DWORD iError, bLength;
 148         InternetGetLastResponseInfo(&iError, NULL, &bLength);
 149         if ( bLength > 0 )
 150         {
 151             wxString errorString;
 152             InternetGetLastResponseInfo
 153             (
 154                 &iError,
 155                 wxStringBuffer(errorString, bLength),
 156                 &bLength
 157             );
 158
 159             wxLogError(wxT("Read failed with error %d: %s"),
 160                        iError, errorString);
 161         }
 162     }
 163
 164     if ( bytesread == 0 )
 165     {
 166         SetError(wxSTREAM_EOF);
 167     }
 168
 169     return bytesread;
 170 }
 171
 172 wxWinINetInputStream::wxWinINetInputStream(HINTERNET hFile)
 173                     : m_hFile(hFile)
 174 {
 175 }
 176
 177 void wxWinINetInputStream::Attach(HINTERNET newHFile)
 178 {
 179     wxCHECK_RET(m_hFile==NULL,
 180         wxT("cannot attach new stream when stream already exists"));
 181     m_hFile=newHFile;
 182     SetError(m_hFile!=NULL ? wxSTREAM_NO_ERROR : wxSTREAM_READ_ERROR);
 183 }
 184
 185 wxWinINetInputStream::~wxWinINetInputStream()
 186 {
 187     if ( m_hFile )
 188     {
 189         InternetCloseHandle(m_hFile);
 190         m_hFile=0;
 191     }
 192 }
 193
 194 wxURLNativeImp *wxURL::CreateNativeImpObject()
 195 {
 196     return new wxWinINetURL;
 197 }
 198
 199 wxInputStream *wxWinINetURL::GetInputStream(wxURL *owner)
 200 {
 201     DWORD service;
 202     if ( owner->GetProtocolName() == wxT("http") )
 203     {
 204         service = INTERNET_SERVICE_HTTP;
 205     }
 206     else if ( owner->GetProtocolName() == wxT("ftp") )
 207     {
 208         service = INTERNET_SERVICE_FTP;
 209     }
 210     else
 211     {
 212         // unknown protocol. Let wxURL try another method.
 213         return 0;
 214     }
 215
 216     wxWinINetInputStream *newStream = new wxWinINetInputStream;
 217     HINTERNET newStreamHandle = InternetOpenUrl
 218                                 (
 219                                     GetSessionHandle(),
 220                                     owner->GetURL(),
 221                                     NULL,
 222                                     0,
 223                                     INTERNET_FLAG_KEEP_CONNECTION |
 224                                     INTERNET_FLAG_PASSIVE,
 225                                     (DWORD_PTR)newStream
 226                                 );
 227     newStream->Attach(newStreamHandle);
 228
 229     return newStream;
 230 }
 231
 232 #endif // wxUSE_URL_NATIVE
 233