You will need to work with the Status event, capturing data read and then
deciding a threshold to flush the buffer to a file and clear it
I made a custom class/wrapper for this
Type
TOnReceiveData = procedure(Len,Max: Int64) of object;
Var
DownloadSize: Int64;
xOnReceiveData: TOnReceiveData;
Type TSynHTTP = class(TObject)
Sock.OnStatus := Status;
//Callback function for status events
procedure TSynHTTP.Status(Sender: TObject; Reason: THookSocketReason; const
Value: String; const ValueInt: Int64);
Var V, currentHeader: String;
i: integer;
function GetSizeFromHeader(Header: String): integer;
Var item: TStringList;
begin
//the download size is contained in the header (e.g.: Content-Length:
3737722)
Result := -1;
if Pos('Content-Length:', Header) <> 0 then begin
item := TStringList.Create();
item.Delimiter := ':';
item.StrictDelimiter :=true;
item.DelimitedText :=Header;
if item.Count = 2 then begin
Result:= StrToInt(Trim(item[1]));
end;
end;
end;
begin
//try to get filesize from headers
if Assigned(xOnReceiveData) then
if (DownloadSize < 1) then begin
for i := 0 to hSock.Headers.Count - 1 do begin
currentHeader := hSock.Headers[i];
DownloadSize := GetSizeFromHeader(currentHeader);
if DownloadSize <> -1 then break;
end;
end;
//HR_ReadCount contains the number of bytes since the last event
if Reason = THookSocketReason.HR_WriteCount then begin
if Assigned(xOnSendData) then xOnSendData(ValueInt);
end;
if DownloadSize > 0 then
if Reason = THookSocketReason.HR_ReadCount then begin
if Assigned(xOnReceiveData) then xOnReceiveData(ValueInt,DownloadSize);
end;
end;
So with this you will get a trigger as received data piles up, ValueInt =
amount of data received on this trigger, let's say 8 KB, then you capture
the event and sum up until you reach something like 50 MB, then write to a
file and clear the HTTPSend.Document stream, repeat until download is
finished.
On 23 January 2017 at 17:45, Rainer Backes <rbac...@bond.de> wrote:
> Hi,
>
> I would need a function/method to download a file via http/https directly
> to disk, without using the memory stream inside the THTTPSend class - the
> files that I have to download can be quite large (some GBs). Does anyone
> already have such a function ?
>
> Thanks
>
> Rainer
>
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