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MFC UDP协议服务器接收数据乱码有关问

发布时间： 2013-08-25 10:49:57 作者： rapoo

MFC UDP协议服务器接收数据乱码问题？
本帖最后由 VisualEleven 于 2013-08-14 14:49:52 编辑 我在为我的一个设备做UDP服务器端，设备发送的是16进制数0xAA，我想在服务器端显示出来，可是我的服务器端接收到的数据显示是“？”，下面是我在网上弄来的UDP服务器代码，我还是菜鸟，请哪位大侠帮我改改程序啊。




// UDP_ServerDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "UDP_Server.h"
#include "UDP_ServerDlg.h"



#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

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

// 对话框数据
enum { IDD = IDD_ABOUTBOX };

protected:
virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

// 实现
protected:
DECLARE_MESSAGE_MAP()
};

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

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

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// CUDP_ServerDlg 对话框




CUDP_ServerDlg::CUDP_ServerDlg(CWnd* pParent /*=NULL*/)
: CDialog(CUDP_ServerDlg::IDD, pParent)
, m_gcIP(0)
, tempStr(_T(""))
, m_strTempString(_T(""))
, m_nPortNO(0)
, m_bServerCreated(false)
, m_strReceEdit(_T(""))
, m_strSendData(_T(""))
, m_bTerminateThread(false)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CUDP_ServerDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_EDIT_SERVER_PORT, m_editPortNO);
DDX_Control(pDX, IDC_EDIT_RECEIVE, m_editReceive);
DDX_Text(pDX, IDC_EDIT_RECEIVE, m_strReceEdit);
DDX_Text(pDX, IDC_EDIT_SEND, m_strSendData);
}

BEGIN_MESSAGE_MAP(CUDP_ServerDlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_BN_CLICKED(IDC_BUTTON_CREATE_SERVER, &CUDP_ServerDlg::OnBnClickedButtonCreateServer)
ON_WM_CLOSE()
ON_BN_CLICKED(IDC_BUTTON_SEND, &CUDP_ServerDlg::OnBnClickedButtonSend)
END_MESSAGE_MAP()


// CUDP_ServerDlg 消息处理程序

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

// 将“关于...”菜单项添加到系统菜单中。

// IDM_ABOUTBOX 必须在系统命令范围内。
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);
}
}

// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
//  执行此操作
SetIcon(m_hIcon, TRUE);// 设置大图标
SetIcon(m_hIcon, FALSE);// 设置小图标

// TODO: 在此添加额外的初始化代码
//WSAStartup()
WSADATAwsaData;
PHOSTENT hostinfo;
if(WSAStartup(MAKEWORD(2,2),&wsaData)!=0)
{
MessageBox("WSAStartup ERROR!");
}

//设置服务器IP地址
char gcTemp[255];
char * IP;
if (0 == gethostname(gcTemp, 255))
{
hostinfo = gethostbyname(gcTemp);
//tempStr.Format("%s", gcTemp);
//MessageBox(tempStr);
IP = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list);
tempStr.Format(IP);
//MessageBox(IP);
SetDlgItemText(IDC_STATIC_SERVER_ADDRESS, tempStr);
//m_addServerAddress.SetAddress();
}

//设置服务器默认端口号为100
SetDlgItemText(IDC_EDIT_SERVER_PORT, "100");
m_bServerCreated = false;
m_bTerminateThread = false;
return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}

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

// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。

void CUDP_ServerDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // 用于绘制的设备上下文

SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

// 使图标在工作矩形中居中
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;

// 绘制图标
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

//当用户拖动最小化窗口时系统调用此函数取得光标显示。
//
HCURSOR CUDP_ServerDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}

UINT ServerRecvThread(LPVOID lpParm ) 
 
{
CUDP_ServerDlg *dlg = (CUDP_ServerDlg*)lpParm;
char gcInBuffer[1027];
int lenth;
CByteArray hexdata;
int size = sizeof(sockaddr_in);
CString strReceive, tempStr;
 char*gcClientIP; 
 bool bSendEnable = false;
while(!dlg->m_bTerminateThread)
{
if ((lenth = recvfrom(dlg->m_sockServer, gcInBuffer, 1024, 0, (struct sockaddr *)&dlg->m_clientAddr, &size) )>0)
{
if (!bSendEnable)
{
CWnd *cwnd = dlg->GetDlgItem(IDC_BUTTON_SEND);
cwnd->EnableWindow(TRUE);
bSendEnable = true;
}

gcClientIP = inet_ntoa((dlg->m_clientAddr).sin_addr);
tempStr.Format("%s", gcClientIP);
dlg->SetDlgItemText(IDC_STATIC_CLINET_ADDRESS, tempStr);
tempStr.Format("%hu", dlg->m_clientAddr.sin_port);
dlg->SetDlgItemText(IDC_STATIC_CLIENT_PORTNO, tempStr);
tempStr.Format("%s:%hu: ", gcClientIP, dlg->m_clientAddr.sin_port);
strReceive += tempStr;
gcInBuffer[lenth] = '\r';
gcInBuffer[lenth+1] = '\n';
gcInBuffer[lenth+2] = '\0';
strReceive += gcInBuffer;
//int len=String2Hex(strReceive,hexdata);

CString str ;
str.Format(_T("%s"), gcInBuffer);
AfxMessageBox(str);

dlg->m_editReceive.SetWindowText(strReceive);
}
}
return 0;
}

void CUDP_ServerDlg::OnBnClickedButtonCreateServer()
{
// TODO: 在此添加控件通知处理程序代码
if (m_bServerCreated)
{
//终止线程
m_bTerminateThread = true;

m_bServerCreated = false;
m_editPortNO.EnableWindow(TRUE);
SetDlgItemText(IDC_BUTTON_CREATE_SERVER, "Create");
//disable send 按钮
CWnd * cwnd = GetDlgItem(IDC_BUTTON_SEND);
cwnd->EnableWindow(FALSE);

} 
else//创建服务器端
{
//读取服务器地址以及端口号
GetDlgItemText(IDC_EDIT_SERVER_PORT, m_strTempString);
m_nPortNO = atoi(m_strTempString.GetBuffer());
//MessageBox(m_strTempString);

//socket
if ((m_sockServer = socket(AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET)
{
MessageBox("ERROR: Create Server Socket Error!");
exit(-1);
}
//bind
struct sockaddr_in serAddr;
serAddr.sin_family = AF_INET;
serAddr.sin_port = htons(m_nPortNO);
(serAddr.sin_addr).s_addr = htonl(INADDR_ANY);
if ((bind(m_sockServer, (LPSOCKADDR)&serAddr, sizeof(serAddr)))==SOCKET_ERROR) 
 
{
MessageBox("ERROR: Bind Socket Error!");
exit(-1);
}
//disable portno
m_editPortNO.EnableWindow(FALSE);
SetDlgItemText(IDC_BUTTON_CREATE_SERVER, "Close");
m_bServerCreated = true;

//创建线程等待
m_bTerminateThread = false;
AfxBeginThread(ServerRecvThread, this, THREAD_PRIORITY_NORMAL, 0, 0, NULL);
}


}


void CUDP_ServerDlg::OnClose()
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
m_bTerminateThread = true;
closesocket(m_sockServer);
WSACleanup();
//Disable close按钮,enable create按钮
CWnd * cwnd = (GetDlgItem(IDC_BUTTON_CREATE_SERVER));
cwnd->EnableWindow(TRUE);
CDialog::OnClose();
}

void CUDP_ServerDlg::OnBnClickedButtonSend()
{
// TODO: 在此添加控件通知处理程序代码
UpdateData(TRUE);
//MessageBox(m_strSendData);
sendto(m_sockServer, m_strSendData, strlen(m_strSendData), 0, (struct sockaddr*)&m_clientAddr, sizeof(sockaddr));
}
int CUDP_ServerDlg::String2Hex(CString str, CByteArray &senddata)
{
int hexdata,lowhexdata;
int hexdatalen=0;
int len=str.GetLength();
senddata.SetSize(len/2);
for(int i=0;i<len;)
{
char lstr,hstr=str[i];
if(hstr==' ')
{
i++;
continue;
}
i++;
if(i>=len)
break;
lstr=str[i];
hexdata=ConvertHexChar(hstr);
lowhexdata=ConvertHexChar(lstr);
if((hexdata==16)||(lowhexdata==16))
break;
else 
hexdata=hexdata*16+lowhexdata;
i++;
senddata[hexdatalen]=(char)hexdata;
hexdatalen++;
}
senddata.SetSize(hexdatalen);
return hexdatalen;
}
char CUDP_ServerDlg::ConvertHexChar(char ch) 
{
if((ch>='0')&&(ch<='9'))
return ch-0x30;
else if((ch>='A')&&(ch<='F'))
return ch-'A'+10;
else if((ch>='a')&&(ch<='f'))
return ch-'a'+10;
else return (-1);
}
UDP 服务器 MFC 乱码
------解决方案--------------------


gcInBuffer 定义为了 char 型, 所以非正常的ASC码就会显示为乱码

数据转换为十六进制的 ASC 码
[解决办法]
BYTE buf[XXX] = {0xAA, xxx};
比如发送端: sendto(SOCKET, (char*)buf, ....);
那么接收端: recvfrom(SOCKET, (chat*)buf, ...);

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