项目实战篇-餐馆管理系统—MFC,PHP,MySql:2.登陆功能的实现
1.mysql 数据库的建立
首先在虚拟机终端上利用 ifconfig 获取虚拟机IP。
然后在本地计算机浏览器地址栏输入 http://192.168.200.128/phpmyadmin 如果载入不成功检查Ubuntu是否安装phpmyadmin。
输入mysql的账号和密码进入。并且新建一个名为 sdb 的数据库
及其对应的表：
privilege
users
2.后端PHP代码
db_info.php
/**
* Created by PhpStorm.
* User: pldq
* Date: 16-12-13
* Time: 下午8:31
*/
#echo "From db_info.php";
# databases infomation
static $DB_HOST="localhost";
static $DB_NAME="sdb";
static $DB_USER="root";
static $DB_PASS="******";
global $con;
$con = mysqli_connect($DB_HOST, $DB_USER, $DB_PASS);
if ($con == null) {
die("FAILED|Could not connect:" . mysqli_error() . "
");
}
if (!mysqli_select_db($con, "sdb")) {
die("FAILED|Could't use foo: " . mysqli_error());
}
?>login.php
'db_info.php');
// echo "Hello World!";
// echo $_REQUEST["username"];
// echo $_REQUEST["psd"];
$username = $_POST["username"];
$psd = $_POST["psd"];
// $phone = $_POST["phone"];
// $email = $_POST["email"];
$sql_username = "Select * from users WHERE username = '" . $username . "'";
$mysqli_result = mysqli_query($con, $sql_username);
$row = mysqli_fetch_array($mysqli_result);
if (mysqli_num_rows($mysqli_result) == 0) {
die("FAILED|The username is not existed!");
}
if ($row['password'] === $psd and strlen($psd) > 6)
{
$str_ret = "SUCCEED|SUCCEED LOGIN IN THE SYSTEM!|";
$sql_get_privilege = "Select * from privilege WHERE username = '" . $username . "'";
$mysqli_privilege_result = mysqli_query($con, $sql_get_privilege);
if (mysqli_num_rows($mysqli_result) == 0) {
$_SESSION['user'] = $username;
die($str_ret);
} else {
$row = mysqli_fetch_array($mysqli_privilege_result);
$_SESSION['user'] = $username;
$_SESSION['rightstr'] = $row['rightstr'];
die($str_ret . $row['rightstr']);
}
} else {
die("FAILED|The password is incorrect!");
}
mysqli_close($con); // close db connect
?>然后将代码上传到Ubuntu 站点目录下
这样网页后端就编写成功了！
3.MFC 端
1、利用 MFC 生成向导生成一个基于对话框的程序。
使用GDI绘图：
#include <gdiplus.h>
#pragma comment(lib, "gdiplus.lib")
using namespace Gdiplus;
// Bitmap* m_mainImage; // 声明为类成员
BOOL CManagementSystemDlg::OnInitDialog()
{
// 初始化 GDI+
GdiplusStartupInput gdiplusStartupInput;
GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
// ！其余代码没有进行修改、删除
}
void CManagementSystemDlg::OnClose()
{
// 释放GDI+
GdiplusShutdown(m_gdiplusToken);
}绘制图片：
#define IMAGE_MAIN_FILENAME L"Important\\res_login\\main.jpg"
BOOL CManagementSystemDlg::OnInitDialog()
{
// 加载图片到内存
m_mainImage = Bitmap::FromFile(IMAGE_MAIN_FILENAME);
}
void CManagementSystemDlg::OnPaint()
{
CClientDC Clientdc(this);
Graphics graphics(Clientdc.GetSafeHdc());
// 绘制图片
graphics.DrawImage(m_mainImage, 0, 0, m_mainImage->GetWidth(), m_mainImage->GetHeight());
}然后编译运行、、、
但是运行后发现窗口并不能实现拖动。为了实现窗口拖动我们还需要让对话框响应 WM_NCHITTEST 消息。让它把点击再窗口客户区的消息响应为在标题栏点击的消息。
LRESULT CManagementSystemDlg::OnNcHitTest(CPoint point)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
CRect rc;
GetClientRect(&rc);
ClientToScreen(&rc);
int x = point.x;
int y = point.y;
if (x >= rc.left && x <= rc.right && y >= rc.top && y <= rc.bottom)
{
return HTCAPTION;
}
else {
return CDialogEx::OnNcHitTest(point);
}
}退出按钮的事件代码：
void CManagementSystemDlg::OnBnClickedButtonExit()
{
// TODO: 在此添加控件通知处理程序代码
this->SendMessage(WM_CLOSE, 0, 0);
}登陆按钮的事件代码：
HTTP访问：
1. 利用MFC 里面的CSession、CHttpConnection等函数：（实现失败！）
#include 这个 Bug 很奇怪，当我打开 Fiddler 进行抓包时 SendRequest 可以成功使用，当我关闭 Fiddler 的抓包功能时它会弹出 “无法与服务器建立连接的信息框”
2. 利用WinHttp 的 com 组件智能指针编程（实现简单、现使用）
#import "C:\\windows\\system32\\winhttp.dll"
#define STRING_LOGIN_HOST_ADDRESS L"http://192.168.200.128/myAdminSystem/login.php"
void CManagementSystemDlg::OnBnClickedButtonLogin()
{
// TODO: 在此添加控件通知处理程序代码
UpdateData(TRUE);
CString strPostData = L"username=" + strUSER + L"&psd=" + strPsd;
// using com programming winhttp
WinHttp::IWinHttpRequestPtr ptrHttp = nullptr;
ptrHttp.CreateInstance(__uuidof(WinHttp::WinHttpRequest));
if (0 != ptrHttp->Open(L"POST", STRING_LOGIN_HOST_ADDRESS))
{
MessageBox(L"服务器连接失败！", L"Info", MB_OK | MB_ICONSTOP);
return;
}
ptrHttp->SetRequestHeader(L"User-Agent", L" Mozilla / 5.0 (Windows NT 6.1; WOW64) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 50.0.2661.102 Safari / 537.36");
ptrHttp->SetRequestHeader(L"Content-Type", L"application/x-www-form-urlencoded");
ptrHttp->Send(strPostData.GetBuffer());
strPostData.ReleaseBuffer();
CString strResult = ptrHttp->GetResponseText();
CString strCookie = ptrHttp->GetResponseHeader(L"Set-Cookie"); // get http post cookie
strCookie.Replace(L"; path=/", L"");
}
对HTTP返回消息的处理：
if (strResult.GetLength() <= 0)
{
MessageBox(L"获取数据失败！", L"Info", MB_OK | MB_ICONWARNING);
return;
}
if (-1 == strResult.Find(L"FAILED"))
{
int index = 0;
CString strCaption = strResult.Mid(index, strResult.Find(L"|", index) - index);
index = strResult.Find(L"|", index) + 1;
CString strInformation = strResult.Mid(index, strResult.Find(L"|", index) - index);
index = strResult.Find(L"|", index) + 1;
CString session = strResult.Mid(index, strResult.GetLength() - index);
MessageBox(strInformation, strCaption, MB_OK | MB_ICONINFORMATION);
// TODO
} else {
int index = 0;
CString strCaption = strResult.Mid(index, strResult.Find(L"|", index) - index);
index = strResult.Find(L"|", index) + 1;
CString strInformation = strResult.Mid(index, strResult.GetLength() - index);
MessageBox(strInformation, strCaption, MB_OK | MB_ICONSTOP);
return;
}这样一个登陆功能就成功实现了！
