Re: [twsocket] TWsocket transfer TmemoryStream
> Always is needed use the OnDataSent event ? > I need only transfer the tmemorystream off a Timage1 to Timage2 over twsocket. You may send a huge block of data in one Send call. An entire image if you like. BUT remember TWSocket is asynchronous and transmitting data over the network takes time. You call to the Send method will return almost instantly, way long before the data is actually sent: TWSocket will automatically buffer the data in memory and send it in the background for you. This may take a lot of memory if you send large data. This may be of no importance for your application, or it IS important... When using OnDataSent event, you have control on the size of data that is memorized. For example you can read your stream 4KB (Any value is OK) at a time, send that chunk of data and then read the next chunk from the OnDataSent event, that is the next chunk will be read and put in internal TWSocket buffer only when previous chunk is sent. This is how the HTTP component (both client and server) are working to send data. This way it doesn't matters if a multi GB file is sent. The memory used is always the size of the chunk your application read. -- francois.pie...@overbyte.be The author of the freeware multi-tier middleware MidWare The author of the freeware Internet Component Suite (ICS) http://www.overbyte.be -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] TWsocket transfer TmemoryStream
> Always is needed use the OnDataSent event ? > I need only transfer the tmemorystream off a Timage1 to Timage2 > over twsocket. It will probably work on a LAN, as long as BLOCK_SIZE is no more than 64 KBytes, and the server accepts the data immediately it's sent. But the proper way is to send chunks in OnDataSent, then you know the other end is accepting the data. The sample OverbyteIcsSender.dpr illustrates how to use OnDataSent to send the next block. Or you could just use my ICS TMagIpLog component, that will send and receive a stream. https://www.magsys.co.uk/delphi/magics.asp That component also uses OnDataSent to send a stream, if you want to borrow the code, but using the proper component would be faster. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] TWsocket transfer TmemoryStream
Always is needed use the OnDataSent event ?
I need only transfer the tmemorystream off a Timage1 to Timage2 over twsocket.
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Original Message
Subject: Re: [twsocket] TWsocket transfer TmemoryStream
Local Time: 5 de Dezembro de 2016 5:31 PM
UTC Time: 5 de Dezembro de 2016 19:31
From: fatim...@protonmail.com
To: ICS support mailing <twsocket@lists.elists.org>
procedure TForm1.SendClick(Sender: TObject);
var
Buffer: array [1..BLOCK_SIZE] of char;
Count: Integer;
MemoryStream : TMemoryStream;
begin
try
MemoryStream := TMemoryStream.Create;
img1.Picture.Graphic.SaveToStream(MemoryStream);
MemoryStream.Seek(0, soFromBeginning);
WSocketServer1.Client[0].SendStr(IntToStr(MemoryStream.Size) + #13#10);
Count := MemoryStream.Read(Buffer[1], BLOCK_SIZE);
if Count > 0 then
WSocketServer1.Client[0].Send(@Buffer[1], Count);
if Count < BLOCK_SIZE then ShowMessage('Sended');
except end;
end;
Its Ok ?
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Original Message
Subject: Re: [twsocket] TWsocket transfer TmemoryStream
Local Time: 5 de Dezembro de 2016 3:19 PM
UTC Time: 5 de Dezembro de 2016 17:19
From: an...@magsys.co.uk
To: twsocket@lists.elists.org
> I need help to send text and stream in same socket
Sending text and stream data is simple, just use Send, although if your
stream is larger than a few kilobytes you need to send it in chunks,
check whether it's been sent, then send the next chunk.
This is how the HTTP client component works.
Receiving mixed text and stream data is much harder, because you don't
generally know where one stops and the other starts. So you design a
protocol, an example being HTTP again, where a blank line says text
stops and stream starts, the stream length being content-length long or
when the socket closes.
Angus
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Visit our website at http://www.overbyte.be
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Re: [twsocket] TWsocket transfer TmemoryStream
procedure TForm1.SendClick(Sender: TObject);
var
Buffer: array [1..BLOCK_SIZE] of char;
Count: Integer;
MemoryStream : TMemoryStream;
begin
try
MemoryStream := TMemoryStream.Create;
img1.Picture.Graphic.SaveToStream(MemoryStream);
MemoryStream.Seek(0, soFromBeginning);
WSocketServer1.Client[0].SendStr(IntToStr(MemoryStream.Size) + #13#10);
Count := MemoryStream.Read(Buffer[1], BLOCK_SIZE);
if Count > 0 then
WSocketServer1.Client[0].Send(@Buffer[1], Count);
if Count < BLOCK_SIZE then ShowMessage('Sended');
except end;
end;
Its Ok ?
Sent from [ProtonMail](https://protonmail.ch), encrypted email based in
Switzerland.
Original Message
Subject: Re: [twsocket] TWsocket transfer TmemoryStream
Local Time: 5 de Dezembro de 2016 3:19 PM
UTC Time: 5 de Dezembro de 2016 17:19
From: an...@magsys.co.uk
To: twsocket@lists.elists.org
> I need help to send text and stream in same socket
Sending text and stream data is simple, just use Send, although if your
stream is larger than a few kilobytes you need to send it in chunks,
check whether it's been sent, then send the next chunk.
This is how the HTTP client component works.
Receiving mixed text and stream data is much harder, because you don't
generally know where one stops and the other starts. So you design a
protocol, an example being HTTP again, where a blank line says text
stops and stream starts, the stream length being content-length long or
when the socket closes.
Angus
--
To unsubscribe or change your settings for TWSocket mailing list
please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket
Visit our website at http://www.overbyte.be
--
To unsubscribe or change your settings for TWSocket mailing list
please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket
Visit our website at http://www.overbyte.be
Re: [twsocket] TWsocket transfer TmemoryStream
> I need help to send text and stream in same socket Sending text and stream data is simple, just use Send, although if your stream is larger than a few kilobytes you need to send it in chunks, check whether it's been sent, then send the next chunk. This is how the HTTP client component works. Receiving mixed text and stream data is much harder, because you don't generally know where one stops and the other starts. So you design a protocol, an example being HTTP again, where a blank line says text stops and stream starts, the stream length being content-length long or when the socket closes. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
