TCP实现聊天和文件传输

[armacd]

我现在这个程序实现了4k以下的文件传输,要想实现大文件的传输如何添加代码呢

服务器端:
// WinSockServerDlg.cpp : implementation file
//

#include "stdafx.h"
#include "WinSockServer.h"
#include "WinSockServerDlg.h"
#include "Package.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
UINT Thread(LPVOID p);

class CAboutDlg : public CDialog
{
public:
CAboutDlg();

// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWinSockServerDlg dialog

CWinSockServerDlg::CWinSockServerDlg(CWnd* pParent /*=NULL*/)
: CDialog(CWinSockServerDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CWinSockServerDlg)
m_strPath = _T("");
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CWinSockServerDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CWinSockServerDlg)
DDX_Control(pDX, IDC_BUTTON_SEND, m_button);
DDX_Control(pDX, IDC_EDIT_MESSAGE, m_edit);
DDX_Control(pDX, IDC_LIST_INFO, m_listInfo);
DDX_Text(pDX, IDC_EDIT_PATH, m_strPath);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CWinSockServerDlg, CDialog)
//{{AFX_MSG_MAP(CWinSockServerDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON_SEND, OnButtonSend)
ON_BN_CLICKED(IDC_BUTTON_EXIT, OnButtonExit)
ON_BN_CLICKED(IDC_BUTTON_SENDFILE, OnButtonSendfile)
ON_BN_CLICKED(IDC_BUTTON_CHOOSE, OnButtonChoose)
ON_BN_CLICKED(IDC_BUTTON_START, OnButtonStart)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWinSockServerDlg message handlers

BOOL CWinSockServerDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
count=0;
m_listInfo.InsertColumn(0,"消息");
m_listInfo.SetColumnWidth(0,435);
m_edit.SetLimitText(99);


return TRUE; // return TRUE unless you set the focus to a control
}

void CWinSockServerDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.

void CWinSockServerDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CWinSockServerDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

void CWinSockServerDlg::OnButtonSend()
{
// TODO: Add your control notification handler code here

struct send_data sd;
sd.start_flag=0xff00;
sd.cmd=0x7;
m_edit.GetWindowText(sd.msg,256);
m_edit.SetWindowText("");
m_listInfo.InsertItem(count++,sd.msg);
sd.length=strlen(sd.msg);


CSize size;
size.cx=0;
size.cy=30;
m_listInfo.Scroll(size);

send(msgsock,(char*)&sd,sd.length+9,0);
}

UINT Thread(LPVOID p)
{
char buff[100];
CSize size;
size.cx=0;
size.cy=30;
int s=1,flag=0;
CWinSockServerDlg *dlg=(CWinSockServerDlg*)AfxGetApp()->GetMainWnd();

dlg->msgsock=accept(dlg->m_sock,(sockaddr*)&(dlg->serv),&(dlg->addlen));
if (dlg->msgsock==INVALID_SOCKET)
{
dlg->m_edit.SetWindowText("error accept");
}
else
{

dlg->m_listInfo.InsertItem(dlg->count++,"连接成功");
dlg->m_listInfo.InsertItem(dlg->count++,inet_ntoa(dlg->serv.sin_addr));
dlg->m_listInfo.Scroll(size);
dlg->m_button.EnableWindow(TRUE);
while (s!=SOCKET_ERROR)
{
s=recv(dlg->msgsock,buff,100,0);

if (s!=SOCKET_ERROR)
{
dlg->m_listInfo.InsertItem(dlg->count++,buff);
dlg->m_listInfo.Scroll(size);
}
}
send(dlg->msgsock,"Disconnect",100,0);
dlg->m_listInfo.InsertItem(dlg->count++,"Disconnected");
dlg->msgsock=NULL;
if (dlg->msgsock!=NULL)
flag=1;
if (flag!=1)
dlg->m_button.EnableWindow(false);
closesocket(dlg->msgsock);
}

AfxEndThread(0);
return 0;
}

void CWinSockServerDlg::OnButtonExit()
{
// TODO: Add your control notification handler code here
DestroyWindow();
}

void CWinSockServerDlg::OnButtonSendfile()
{
// TODO: Add your control notification handler code here

struct send_data sd;
DWORD dwRead;
CFile m_file(m_strPath,CFile::modeRead|CFile::typeBinary);
sd.start_flag=0xff00;
sd.cmd=0x4;
sd.length=m_file.GetLength();
for (int i=0;i<4096;i++)
{
sd.msg[i]=' ';
}
do
{
dwRead = m_file.Read(sd.msg, 4096);
if(dwRead!=0)
send(msgsock,(char*)&sd,strlen(sd.msg)+9,0);
}
while (dwRead > 0);
}

void CWinSockServerDlg::OnButtonChoose()
{
// TODO: Add your control notification handler code here

CFileDialog dlg(TRUE);
if (dlg.DoModal()!=IDOK)
return;
m_strPath=dlg.GetPathName();


UpdateData(FALSE);
}


void CWinSockServerDlg::OnButtonStart()
{
// TODO: Add your control notification handler code here
serv.sin_addr.s_addr=htonl(INADDR_ANY);
serv.sin_family=AF_INET;
serv.sin_port=5000;
addlen=sizeof(serv);
m_button.EnableWindow(FALSE);
m_sock=socket(AF_INET,SOCK_STREAM,0);
if (bind(m_sock,(sockaddr*)&serv,addlen))
{
m_edit.SetWindowText("绑定错误");

}else
{
//m_edit.SetWindowText("服务器创建成功");
listen(m_sock,5);
AfxBeginThread(&Thread,0);
}
}

[armacd]

客户端:
// WinSockClientDlg.cpp : implementation file
//

#include "stdafx.h"
#include "WinSockClient.h"
#include "WinSockClientDlg.h"
#include "Package.h"
#include "Filereceivedlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
UINT Thread(LPVOID p);
/*UINT Thread1(LPVOID p);*/
class CAboutDlg : public CDialog
{
public:
CAboutDlg();

// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWinSockClientDlg dialog

CWinSockClientDlg::CWinSockClientDlg(CWnd* pParent /*=NULL*/)
: CDialog(CWinSockClientDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CWinSockClientDlg)
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CWinSockClientDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CWinSockClientDlg)
DDX_Control(pDX, IDC_BUTTON_DISCONNECT, m_buttonDisconnect);
DDX_Control(pDX, IDC_EDIT_IP, m_editIP);
DDX_Control(pDX, IDC_EDIT_MESSAGE, m_editMessage);
DDX_Control(pDX, IDC_LIST_INFO, m_listInfo);
DDX_Control(pDX, IDC_BUTTON_CONNECT, m_buttonConnect);
DDX_Control(pDX, IDC_BUTTON_SEND, m_buttonSend);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CWinSockClientDlg, CDialog)
//{{AFX_MSG_MAP(CWinSockClientDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON_CONNECT, OnButtonConnect)
ON_BN_CLICKED(IDC_BUTTON_DISCONNECT, OnButtonDisconnect)
ON_BN_CLICKED(IDC_BUTTON_SEND, OnButtonSend)
ON_BN_CLICKED(IDC_BUTTON_RECEIVEFILE, OnButtonReceivefile)
ON_BN_CLICKED(IDC_BUTTON_REFUSEFILE, OnButtonRefusefile)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWinSockClientDlg message handlers

BOOL CWinSockClientDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
m_editMessage.SetLimitText(99);
m_listInfo.InsertColumn(0,"消息");
m_listInfo.SetColumnWidth(0,435);
m_buttonSend.EnableWindow(FALSE);
m_buttonDisconnect.EnableWindow(false);
m_editIP.SetWindowText("127.0.0.1");
count=0;

return TRUE; // return TRUE unless you set the focus to a control
}

void CWinSockClientDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.

void CWinSockClientDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CWinSockClientDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

void CWinSockClientDlg::OnButtonConnect()
{
// TODO: Add your control notification handler code here
char ipaddress[35];
m_editIP.GetWindowText(ipaddress,30);
cli.sin_addr.s_addr=inet_addr(ipaddress);
cli.sin_family=AF_INET;
cli.sin_port=5000;
clisock=socket(AF_INET,SOCK_STREAM,0);
AfxBeginThread(Thread,0);
}

void CWinSockClientDlg::OnButtonDisconnect()
{
// TODO: Add your control notification handler code here
closesocket(clisock);
}

void CWinSockClientDlg::OnButtonSend()
{
// TODO: Add your control notification handler code here
char buff[100];
CSize size;
size.cx=0;
size.cy=30;
//获得发送信息
m_editMessage.GetWindowText(buff,99);
m_editMessage.SetWindowText("");
m_listInfo.InsertItem(count++,buff);
m_listInfo.Scroll(size);
//发送数据
send(clisock,buff,100,0);
}
UINT Thread(LPVOID p)
{

UINT get=0;
struct receive_data rd;
CSize size;
size.cx=0;
size.cy=30;
int s=1,addcount=0;
CWinSockClientDlg *dlg=(CWinSockClientDlg*) AfxGetApp()->GetMainWnd();
dlg->m_buttonConnect.EnableWindow(FALSE);
dlg->m_buttonDisconnect.EnableWindow(TRUE);
//连接到服务器
if(connect(dlg->clisock,(sockaddr*)&(dlg->cli),sizeof(dlg->cli)))
{
dlg->m_listInfo.InsertItem(dlg->count++,"连接服务器失败");
return -1;
}

dlg->m_listInfo.InsertItem(dlg->count++,"连接服务器成功");
dlg->m_buttonSend.EnableWindow(TRUE);
dlg->SetForegroundWindow();
for (int i=0;i<4096;i++)
{
rd.msg[i]=' ';
}


//循环获得数据
while(s!=SOCKET_ERROR)
{
//调用recv函数接收数据

s=recv(dlg->clisock,(char*)&rd,sizeof(rd),0);
if (rd.cmd==0x7)
{
if (s!=SOCKET_ERROR)
dlg->m_listInfo.InsertItem(dlg->count++,rd.msg);
dlg->m_listInfo.Scroll(size);
for (int i=0;i<strlen(rd.msg);i++)
{
rd.msg[i]=' ';
}
}
else if (rd.cmd==0x4)
{

if(IDOK == AfxMessageBox(_T("您收到一个文件请确定是否接收?"), MB_OKCANCEL | MB_ICONQUESTION))
{


CFileDialog fileDlg(FALSE);

if(IDOK == fileDlg.DoModal())

{
CFile destFile(fileDlg.GetPathName()+"."+"txt",CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);

UINT dwRead = 1;

destFile.Write(rd.msg, strlen(rd.msg));
destFile.Close();
AfxMessageBox("接收完毕！");
for (int i;i<strlen(rd.msg);i++)
{
rd.msg[i]=' ';
}

}

else
{
AfxMessageBox(_T("CANCEL"));
}


}


}

}

//发送断开命令
send(dlg->clisock,"Disconnected",100,0);
dlg->m_buttonSend.EnableWindow(FALSE);
dlg->m_buttonConnect.EnableWindow(TRUE);
dlg->m_buttonDisconnect.EnableWindow(FALSE);
closesocket(dlg->clisock);
AfxEndThread(0);
return 0;
}


void CWinSockClientDlg::OnButtonReceivefile()
{
// TODO: Add your control notification handler code here
/* AfxBeginThread(Thread1,0);*/

}


void CWinSockClientDlg::OnButtonRefusefile()
{
// TODO: Add your control notification handler code here

}

[smwhotjay]

分块.

[armacd]

数据包结构:
#define filesize 4096

struct send_data
{
short start_flag;
char cmd;
int length;
char msg[filesize];
short end_flag;
};

[大地七枷社]

是不是有个传输文件的类来着，试试CSocketFile类。或者分块，设置开始标志或者结束标志，开始时候标注这包文件的大小

[armacd]

我用的是socket套结字 现在就想少改动能实现大文件的传输,能根据程序给点思路 或者写点代码吗 给加分

[roeast]

给recv函数加个while循环，就可以实现大文件的传输了~
比如：
while(-1 != recv(buf,*,*,* ))
{
//continue receive;

//将缓冲区收到的数据写入文件

memset(buf, 0, sizeof(buf)); //记得每收一次清空一次缓冲区
}

[armacd]

在哪写接受循环呢 因为循环还要考虑来的如果是消息的处理

[King_hhuang]

打文件传输，先传文件长度

然后读文件的时候，读一段传输一包

接收的时候，接收到一包就写入一段到文件，直到接收到的总数据等于文件长度的时候就结束

[wmnmtm]

大文件的传输是不断的发送定长的数据包实现的，

个人猜测：

第一次发送文件总长度，然后建一个初始化为000000000000000000的文件，
后续包，包头指定本次的长度，偏移文件头的位置，收到后存到准确位置。

这样可以多线程来收发。

稍加修改可以实现断点续传

[wmnmtm]

[Quote=引用 7 楼 armacd 的回复:]
在哪写接受循环呢 因为循环还要考虑来的如果是消息的处理
[/Quote]

同一个套接字收不同的类型包，就要构造信息头，收到时根据本包类型选择处理。

[wmnmtm]

补充一下，收发大文件，要先修改一下发送数据缓冲区，昨天在一本书上看的。

[armacd]

没人给写点代码呀