Question

Download File with ICS, IdHTTP or InternetReadfile

Asked by: TDS

Hello,
I have a download function for files. It works in BDS 2006, but now I have CodeGear RAD 2009 und it doesn't :-( I think it's a problem that all strings are now in Unicode. I've tried with ICS und IdHTTP too, but there are also the headers (i couldn't strip them).
Can someone help me to have a workling solution in Delphi 2009?

Thx in advance

Bye, TDS

function TMainForm.GetHTML(AUrl: string): string;
var
  databuffer : array[0..4095] of char;
  ResStr : string;
  hSession, hfile: hInternet;
  dwindex,dwcodelen,dwread,dwNumber: cardinal;
  dwcode : array[1..20] of char;
  res    : pchar;
  Str    : pchar;
begin
   ResStr := '';
   Result := '';
  if pos('http://',lowercase(AUrl))=0 then
    AUrl:='http://'+AUrl;
   MainForm.WriteLog('GetHTML(): ' + AUrl);
  hSession:=InternetOpen('InetURL:/1.0', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
   If assigned(hSession) Then
  try
    hfile:=InternetOpenUrl(hsession, pchar(AUrl), nil, 0, INTERNET_FLAG_RELOAD, 0);
      if assigned(hfile) then
      try
      dwIndex  := 0;
      dwCodeLen := 10;
      HttpQueryInfo(hfile, HTTP_QUERY_STATUS_CODE, @dwcode, dwcodeLen, dwIndex);
      res := pchar(@dwcode);
      dwNumber := sizeof(databuffer)-1;
      if (res ='200') or (res ='302') then
      begin
        while (InternetReadfile(hfile,@databuffer,dwNumber,DwRead)) AND (dwRead <>0) do
        begin
          databuffer[dwread]:=#0;
          Str := pchar(@databuffer);
          resStr := resStr + Str;
          Application.ProcessMessages;
        end;
      end
      else
        ResStr := 'Status: '+res;
      finally
        InternetCloseHandle(hfile);
     end;
  finally
    InternetCloseHandle(hsession);
  end;
   MainForm.WriteLog('GetHTML(): ' + ResStr);
   Result := ResStr;
   Result := '';
end;

                                  
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Asked On
2009-01-24 at 03:22:28ID24079994
Topics

Internet and Delphi Programming

,

Delphi Programming

Participating Experts
1
Points
250
Comments
1

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Answers

 

by: smotPosted on 2009-01-24 at 05:15:13ID: 23456230

take Length instead of Sizeof() ->

   dwNumber := Length(databuffer) - 1;

Also see: Delphi 2009: SizeOf and Length:
http://chee-yang.blogspot.com/2008/10/delphi-2009-sizeof-and-length.html

uses
  WinInet;
 
function GetHTML(AUrl: string): string;
var
  databuffer: array[0..4095] of Char;
  resStr: string;
  hSession, hFile: hInternet;
  dwindex, dwcodelen, dwread, dwNumber: cardinal;
  dwcode: array[1..20] of PChar;
  res: PChar;
  Str: PAnsiChar;
begin
  ResStr := '';
  if Ansipos('http://', LowerCase(AUrl)) = 0 then
    AUrl := 'http://' + AUrl;
  hSession := InternetOpen('InetURL:/1.0',
    INTERNET_OPEN_TYPE_PRECONFIG,
    nil,
    nil,
    0);
  if Assigned(hSession) then
  begin
    hfile := InternetOpenUrl(
      hSession,
      PChar(aUrl),
      nil,
      0,
      INTERNET_FLAG_RELOAD,
      0);
    dwIndex := 0;
    dwCodeLen := 10;
    HttpQueryInfo(hfile,
      HTTP_QUERY_STATUS_CODE,
      @dwcode,
      dwcodeLen,
      dwIndex);
    res := PChar(@dwcode);
   dwNumber := Length(databuffer) - 1;
    if (res = '200') or (res = '302') then
    begin
      while (InternetReadfile(hfile,
        @databuffer,
        dwNumber,
        DwRead)) do
      begin
        if dwRead = 0 then Break;
        databuffer[dwread] := #0;
        Str := PAnsiChar(@databuffer);
        resStr := resStr + string(Str);
      end;
    end
    else
      ResStr := 'Status:' + res;
    if assigned(hFile) then
      InternetCloseHandle(hFile);
  end;
  InternetCloseHandle(hSession);
  Result := resStr;
end;

                                              
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