VC2010 implementation of Modbus transmission based on TCP/IP

No more nonsense, the whole program and code will be released later.

Tool Download: http://download.csdn.net/detail/stevenking55/5186848

Tool source code Download:

It's basically three functions:

1.OnButtonjoin () Establishing a connection

void Cclientdlg::onbuttonjoin () 
{
	//Todo:add your control notification handler code here
	UpdateData (True) ;
	CString servername = m_server_addr; Get the server address
	int port = atoi (M_port);//Get Port
	
	if (pmysocket! = NULL)
	{
		//delete pmysocket;
		Pmysocket = NULL;
	}
	Pmysocket = new Cmysocket (this); Create socket Object
	if (!pmysocket->create ())//Create socket
	{
		delete pmysocket;
		Pmysocket = NULL;
		MessageBox ("Socket creation failed.");
		return;
	}
	if (!pmysocket->connect (Servername,port))//Connect server
	{
		MessageBox ("Connection server failed!");
		return;
	}
	flag = 1;
	Success shows the connected
	CString str;
	Str. Format ("Modbus TCP/IP device%s port%s is connected. ", m_server_addr,m_port);
	int getcount = M_send. GetCount ();
	M_send. Insertstring (m_send. GetCount (), str);

}

2.ReceiveData () Accept function

void Cclientdlg::receivedata ()
{
	unsigned char receivebuf[200];
	Received data from
	int receive_data_num =  pmysocket->receive (receivebuf,200);
	int i=0,j=0;
	CString str,str1,temp;

	while (I < receive_data_num)
	{
		temp. Format ("%02x", Receivebuf[i]);
		if (receivebuf[i] = = 0xff)
			j = i;
		str = str + temp + ";
		i++;
	}
	Add 16 binary data to the list box
	//int getcount = m_receive. GetCount ();
	M_receive. Insertstring (m_receive. GetCount (), str);
	
	hexadecimal to decimal output
	j = j + 3;
	while (J < Receive_data_num)
	{
		int temp_num = (int) (RECEIVEBUF[J]<<8);
		Temp_num = temp_num + (int) receivebuf[j+1];
		Temp. Format ("%d", temp_num);
		STR1 = str1 + temp + ";
		j = j + 2;
	}
	int getcount1 = m_receive. GetCount ();
	M_receive. Insertstring (m_receive. GetCount (), str1);
}

3.OnButtonsend () Send function

void Cclientdlg::onbuttonsend () {UpdateData (true);
	Todo:add your control notification handler code here CString str,temp;
	int i = 0;
	unsigned char sendbuf[12] = {0};
		Check for error if (Pmysocket = = NULL | | flag = = 0) {MessageBox ("Please make a connection first!");
	Return } if (m_server_addr. IsEmpty () |m_port.
		IsEmpty ()) {MessageBox ("Please check server address and port number!");
	Return
	}//Processing data M_DATA_ADDR = ((m_data_addr-1) & 0xFFFF);
	M_data_addr_low = (unsigned char) ((M_DATA_ADDR) & 0X00FF);
	M_data_addr_high = (unsigned char) (((M_DATA_ADDR) >>8) & 0X00FF);
	M_data_num = (M_data_num & 0xFFFF);
	M_data_num_low = (unsigned char) ((m_data_num) & 0X00FF);
	M_data_num_high = (unsigned char) (((M_data_num) >>8) & 0X00FF); i = M_cmdword.
	GetCurSel ();
		switch (i) {case 0:sendbuf[7] = 0x01;
	Break
		Case 1:sendbuf[7] = 0x02;
	Break
		Case 2:sendbuf[7] = 0x03;
	Break
		Case 3:sendbuf[7] = 0x04;
	Break
		Case 4:sendbuf[7] = 0x05;
	Break
		Case 5:sendbuf[7] = 0x06; BReak;
		Case 6:sendbuf[7] = 0x0f;
	Break
		Case 7:sendbuf[7] = 0x10;
	Break
		Case 8:sendbuf[7] = 0x14;
	Break
		Case 9:sendbuf[7] = 0x15;
	Break
		Case 10:sendbuf[7] = 0x16;
	Break
		Case 11:sendbuf[7] = 0x17;
	Break
		Case 12:sendbuf[7] = 0x2B;
	Break Default:messagebox ("Command word error.
		");
	Break
	}//Generate Modbus Format data sendbuf[0] = m_1;//transaction meta identifier, high byte in front, low byte at rear sendbuf[1] = m_2;
	SENDBUF[2] = m_3;//protocol identifier, high byte in front, low byte at rear sendbuf[3] = M_4;
	SENDBUF[4] = 0x00;//Subsequent byte length, high byte in front, low byte at rear sendbuf[5] = 0x06; SENDBUF[6] = m_7;//cell identifier//sendbuf[7] = 0x03;//m_cmdword;//command word sendbuf[8] = m_data_addr_high;//data start address, high byte in front, low byte behind sendb
	UF[9] = M_data_addr_low;
	
	SENDBUF[10] = m_data_num_high;//data length, high byte in front, low byte at rear sendbuf[11] = M_data_num_low;

	int num = pmysocket->send (sendbuf,12);
	Success shows the sent data i = 0; while (i <=) {temp.
		Format ("%02x", Sendbuf[i]);
		str = str + temp + ";
	i++; } int getcount = M_send.
	GetCount (); M_send. Insertstring (m_send.

	GetCount (), str); M_receiVe.
	SetWindowText (""); M_receive.
SetFocus (); }