Easy Installer

// About.cpp : implementation file
//

#include "stdafx.h"
#include "CreateInstaller.h"
#include "About.h"
#include ".\about.h"

struct VS_VERSIONINFO
{
    WORD                wLength;
    WORD                wValueLength;
    WORD                wType;
    WCHAR               szKey[1];
    WORD                wPadding1[1];
    VS_FIXEDFILEINFO    Value;
    WORD                wPadding2[1];
    WORD                wChildren[1];
};


// CAbout dialog

IMPLEMENT_DYNAMIC(CAbout, CDialog)
CAbout::CAbout(CWnd* pParent /*=NULL*/)
	: CDialog(CAbout::IDD, pParent)
{
}

CAbout::~CAbout()
{
}

void CAbout::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_EDIT1, m_edtVer);
}


BEGIN_MESSAGE_MAP(CAbout, CDialog)
END_MESSAGE_MAP()


// CAbout message handlers

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

	CString verStr;
	LPCTSTR lpszFilename = _T("EasyInstaller.exe");
	DWORD   dwHandle, dwSize;

	// determine the size of the resource information
	dwSize = GetFileVersionInfoSize((LPTSTR)lpszFilename, &dwHandle);
	if (0 < dwSize)
	{
		LPBYTE lpBuffer = new BYTE[dwSize];

		#define roundoffs(a,b,r) (((BYTE *) (b) - (BYTE *) (a) + ((r) - 1)) & ~((r) - 1))
		#define roundpos(a,b,r) (((BYTE *) (a)) + roundoffs(a,b,r))

		GetFileVersionInfo((LPTSTR)lpszFilename, 0, dwSize, lpBuffer);
		VS_VERSIONINFO *pVerInfo = (VS_VERSIONINFO *) lpBuffer;
		// the fixed section starts right after the 'VS_VERSION_INFO' string
//		LPBYTE pOffsetBytes = (BYTE *) &pVerInfo->szKey[_tcslen(pVerInfo->szKey) + 1];
		LPBYTE pOffsetBytes = (BYTE *) &pVerInfo->szKey[wcslen(pVerInfo->szKey) + 1];
		VS_FIXEDFILEINFO *pFixedInfo = (VS_FIXEDFILEINFO *) roundpos(pVerInfo, pOffsetBytes, 4);

		int pvMS = pFixedInfo->dwFileVersionMS;
		int pvLS = pFixedInfo->dwFileVersionLS;
		int loLS = LOWORD(pvLS);
		int hiLS = HIWORD(pvLS);
		int loMS = LOWORD(pvMS);
		int hiMS = HIWORD(pvMS);

		delete [] lpBuffer;

		verStr.Format(_T("Version %d.%d.%d (build %d)"), hiMS, loMS, hiLS, loLS);
		m_edtVer.SetWindowText(verStr);
	}

	return TRUE;  // return TRUE unless you set the focus to a control
	// EXCEPTION: OCX Property Pages should return FALSE
}