// ReadOtherCmdLineDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ReadOtherCmdLine.h"
#include "ReadOtherCmdLineDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CReadOtherCmdLineDlg dialog

CReadOtherCmdLineDlg::CReadOtherCmdLineDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CReadOtherCmdLineDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CReadOtherCmdLineDlg)
	m_szCmdLine = _T("");
	m_nPID = 0;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CReadOtherCmdLineDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CReadOtherCmdLineDlg)
	DDX_Text(pDX, IDC_CMDLINE, m_szCmdLine);
	DDX_Text(pDX, IDC_PID, m_nPID);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CReadOtherCmdLineDlg, CDialog)
	//{{AFX_MSG_MAP(CReadOtherCmdLineDlg)
	ON_WM_PAINT()
	ON_BN_CLICKED(IDC_GET, OnGet)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CReadOtherCmdLineDlg message handlers

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

	// 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
	
	m_nPID = GetCurrentProcessId();
	UpdateData(FALSE);

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

// 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 CReadOtherCmdLineDlg::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();
	}
}

DWORD g_GetCmdLine(DWORD dwPID,TCHAR* pCmdLine,DWORD dwBufLen)
{
#define BUFFER_LEN    512        //reading buffer for the commandline

    HANDLE hProc = OpenProcess(PROCESS_VM_READ,FALSE,dwPID);
    if(hProc == NULL)
    {
        return GetLastError();
    }
    
    DWORD dwRet = -1;
    DWORD dwAddr = *(DWORD*)((DWORD)GetCommandLine + 1);//第2個字節開始才是我們要讀的地址
    TCHAR tcBuf[BUFFER_LEN] = {0};
    DWORD dwRead = 0;
    
    //判斷平臺
    DWORD dwVer = GetVersion();
    try
    {
        if(dwVer < 0x80000000)        // Windows NT/2000/XP
        {
            if(ReadProcessMemory(hProc,(LPVOID)dwAddr,&dwAddr,4,&dwRead))
            {
                if(ReadProcessMemory(hProc,(LPVOID)dwAddr,tcBuf,BUFFER_LEN,&dwRead))
                {
                    _tcsncpy(pCmdLine,tcBuf,dwBufLen);    //最好檢查一下dwRead和dwBufLen的大小，使用較小的那個
                    dwRet = 0;
                }
            }        
        }
        else                        // Windows 95/98/Me    and Win32s
        {
            while(true)                //使用while是為了出錯時方便跳出循環
            {
                if(!ReadProcessMemory(hProc,(LPVOID)dwAddr,&dwAddr,4,&dwRead)) break;
                if(!ReadProcessMemory(hProc,(LPVOID)dwAddr,&dwAddr,4,&dwRead)) break;
                
                if(!ReadProcessMemory(hProc,(LPVOID)(dwAddr + 0xC0),tcBuf,BUFFER_LEN,&dwRead)) break;
                if(*tcBuf == 0)
                {
                    if(!ReadProcessMemory(hProc,(LPVOID)(dwAddr + 0x40),&dwAddr,4,&dwRead)) break;
                    if(!ReadProcessMemory(hProc,(LPVOID)(dwAddr + 0x8),&dwAddr,4,&dwRead)) break;
                    if(!ReadProcessMemory(hProc,(LPVOID)dwAddr,tcBuf,BUFFER_LEN,&dwRead)) break;
                }
                
                _tcsncpy(pCmdLine,tcBuf,dwBufLen);    //最好檢查一下dwRead和dwBufLen的大小，使用較小的那個
                dwRet = 0;
                break;
            }
        }
    }
    catch(...)
    {
        dwRet = ERROR_INVALID_ACCESS;    //exception
    }
    CloseHandle(hProc);
    
    return dwRet;
}

void CReadOtherCmdLineDlg::OnGet() 
{
	UpdateData();
	if(m_nPID < 0)
	{
		AfxMessageBox("pid not valid");return;
	}
	const int BUF_LEN =	512;
	if(g_GetCmdLine(m_nPID,m_szCmdLine.GetBuffer(BUF_LEN),BUF_LEN)!= 0)
	{
		AfxMessageBox("error occured.");return;
	}
	m_szCmdLine.ReleaseBuffer();
	UpdateData(FALSE);
}