TTcpClientSendStream (C++)

Description

This example demonstrates the use of the SendStream method and can be used with the example for TTcpServer_(C++).

To build this example, create a VCL Forms Application. Add a button, a memo box, an edit box, and a TTcpClient from the Tool Palette.

Code

Define the default port for the communication and include <memory>.

#define DEFAULT_PORT 2501//The default port for the communication 
#include <memory>  //For the STL auto_ptr class

Add the code below to the OnClick event of the button:

void __fastcall TForm2::Button1Click(TObject *Sender)
{
		//Creating a stream
//	TMemoryStream* myStream = new TMemoryStream();
	std::auto_ptr<TMemoryStream> myStream(new TMemoryStream);
	for (byte i = 0; i < 9; i++)
	{
		myStream->WriteBuffer(&i,1);
	}
	int userValue = StrToIntDef(Edit1->Text, 0);
	myStream->WriteBuffer(&userValue, 1);

	//Resetting the stream position
	myStream->Seek(0, 0);

	//Sending the stream
	TcpClient1->Active = true;
	TcpClient1->SendStream(myStream.get());
	TcpClient1->Active = false;

	//Free the stream.
//	delete myStream;

}

Add the code below to the OnCreate event handler of the form.

void __fastcall TForm2::FormCreate(TObject *Sender)
{
	Edit1->Text = "0";
	Memo1->Lines->Clear();

	TcpClient1 = new TTcpClient(this);
	//TcpClient1->OnSend = TcpClient1Send;
	TcpClient1->RemotePort = DEFAULT_PORT;
	TcpClient1->RemoteHost = "localhost";

}

Add the code below to the OnSend event handler of the TTcpClient.

void __fastcall TForm2::TcpClient1Send(TObject *Sender, PChar Buf, int &DataLen)
{
	TDateTime now = TDateTime::CurrentDateTime();
	Memo1->Lines->Add(DateTimeToStr(now) + " Send data with " + Edit1->Text);

}

Add the code below to the OnCreateHandle event handler of the TTcpClient.

void __fastcall TForm2::TcpClient1CreateHandle(TObject *Sender)
{
// This procedure displays on the memo when the client is ready to send the message or the message was sent to the server

	TDateTime now = TDateTime::CurrentDateTime();
	if (Memo1->Text!= "") {
		Memo1->Lines->Add(DateTimeToStr(now)+ "sending...");
	}
	else
	{
		Memo1->Lines->Add(DateTimeToStr(now)+ "ready");
	}
}

Add the code below to the OnDestroyHandle event handler of the TTcpClient.

void __fastcall TForm2::TcpClient1DestroyHandle(TObject *Sender)
{
//This procedure displays on the memo when the message was send
  TDateTime now = TDateTime::CurrentDateTime();
  if (this->Memo1 != NULL)
	Memo1->Lines->Add(DateTimeToStr(now) + " sent");
  Edit1->Text=" ";
}

Uses

• Web.Win.Sockets.TTcpClient ( fr | de | ja )
• Web.Win.Sockets.TBaseSocket.SendStream ( fr | de | ja )
• Web.Win.Sockets.TBaseSocket.OnSend ( fr | de | ja )
• Web.Win.Sockets.TIpSocket.RemoteHost ( fr | de | ja )
• Web.Win.Sockets.TIpSocket.RemotePort ( fr | de | ja )
• Web.Win.Sockets.TBaseSocket.Active ( fr | de | ja )
• Web.Win.Sockets.TTcpClient.OnCreateHandle ( fr | de | ja )
• Web.Win.Sockets.TTcpClient.OnDestroyHandle ( fr | de | ja )