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   <TITLE>Misc - Retrieving version information from module resources (2)</TITLE>
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Retrieving version information from module resources (2)
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This article was contributed by <A HREF="mailto:mlaflamm@total.net">Manuel Laflamme </A>.

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<p>Roberto Rocco already give us a class to get version information from module
resources (.exe, .dll, etc.) it works great for the fixed information but
you have to know the language-charset of the module for retrieving language
dependant information.

<p>My class, CFileVersion, allow you to get fixed and the language dependant
information. The class use the first language-charset available from the
module, so you don't have to worry about it.

<p>Some of the most use information have predefined method like
GetFileVersion(), GetCompanyName(), etc. You can also use QueryValue() if
you need to get uncommon or custom data, or if you really want to get data
from a specific language-charset.

<p>You don't have to explicitly add version.lib on your project setting, a
pragma directive take care of it.

<p>And now the class:

<FONT COLOR="#990000"><TT><PRE>
// FileVersion.h: interface for the CFileVersion class.
// by Manuel Laflamme
//////////////////////////////////////////////////////////////////////

#ifndef __FILEVERSION_H_
#define __FILEVERSION_H_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

class CFileVersion
{ 
// Construction
public: 
    CFileVersion();

// Operations	
public: 
    BOOL    Open(LPCTSTR lpszModuleName);
    void    Close();

    CString QueryValue(LPCTSTR lpszValueName, DWORD dwLangCharset = 0);
    CString GetFileDescription()  {return QueryValue(_T("FileDescription")); };
    CString GetFileVersion()      {return QueryValue(_T("FileVersion"));     };
    CString GetInternalName()     {return QueryValue(_T("InternalName"));    };
    CString GetCompanyName()      {return QueryValue(_T("CompanyName"));     }; 
    CString GetLegalCopyright()   {return QueryValue(_T("LegalCopyright"));  };
    CString GetOriginalFilename() {return QueryValue(_T("OriginalFilename"));};
    CString GetProductName()      {return QueryValue(_T("ProductName"));     };
    CString GetProductVersion()   {return QueryValue(_T("ProductVersion"));  };

    BOOL    GetFixedInfo(VS_FIXEDFILEINFO& vsffi);
    CString GetFixedFileVersion();
    CString GetFixedProductVersion();

// Attributes
protected:
    LPBYTE  m_lpVersionData; 
    DWORD   m_dwLangCharset; 

// Implementation
public:
    ~CFileVersion(); 
}; 

#endif  // __FILEVERSION_H_




// FileVersion.cpp: implementation of the CFileVersion class.
// by Manuel Laflamme 
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "FileVersion.h"

#pragma comment(lib, "version")

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

//////////////////////////////////////////////////////////////////////

CFileVersion::CFileVersion() 
{ 
    m_lpVersionData = NULL;
    m_dwLangCharset = 0;
}

CFileVersion::~CFileVersion() 
{ 
    Close();
} 

void CFileVersion::Close()
{
    delete[] m_lpVersionData; 
    m_lpVersionData = NULL;
    m_dwLangCharset = 0;
}

BOOL CFileVersion::Open(LPCTSTR lpszModuleName)
{
    ASSERT(_tcslen(lpszModuleName) > 0);
    ASSERT(m_lpVersionData == NULL);

    // Get the version information size for allocate the buffer
    DWORD dwHandle;     
    DWORD dwDataSize = ::GetFileVersionInfoSize((LPTSTR)lpszModuleName, &dwHandle); 
    if ( dwDataSize == 0 ) 
        return FALSE;

    // Allocate buffer and retrieve version information
    m_lpVersionData = new BYTE[dwDataSize]; 
    if (!::GetFileVersionInfo((LPTSTR)lpszModuleName, dwHandle, dwDataSize, 
	                          (void**)m_lpVersionData) )
    {
        Close();
        return FALSE;
    }

    // Retrieve the first language and character-set identifier
    UINT nQuerySize;
    DWORD* pTransTable;
    if (!::VerQueryValue(m_lpVersionData, _T("\\VarFileInfo\\Translation"),
                         (void **)&pTransTable, &nQuerySize) )
    {
        Close();
        return FALSE;
    }

    // Swap the words to have lang-charset in the correct format
    m_dwLangCharset = MAKELONG(HIWORD(pTransTable[0]), LOWORD(pTransTable[0]));

    return TRUE;
}

CString CFileVersion::QueryValue(LPCTSTR lpszValueName, 
                                 DWORD dwLangCharset /* = 0*/)
{
    // Must call Open() first
    ASSERT(m_lpVersionData != NULL);
    if ( m_lpVersionData == NULL )
        return (CString)_T("");

    // If no lang-charset specified use default
    if ( dwLangCharset == 0 )
        dwLangCharset = m_dwLangCharset;

    // Query version information value
    UINT nQuerySize;
    LPVOID lpData;
    CString strValue, strBlockName;
    strBlockName.Format(_T("\\StringFileInfo\\%08lx\\%s"), 
	                     dwLangCharset, lpszValueName);
    if ( ::VerQueryValue((void **)m_lpVersionData, strBlockName.GetBuffer(0), 
	                     &lpData, &nQuerySize) )
        strValue = (LPCTSTR)lpData;

    strBlockName.ReleaseBuffer();

    return strValue;
}

BOOL CFileVersion::GetFixedInfo(VS_FIXEDFILEINFO& vsffi)
{
    // Must call Open() first
    ASSERT(m_lpVersionData != NULL);
    if ( m_lpVersionData == NULL )
        return FALSE;

    UINT nQuerySize;
	VS_FIXEDFILEINFO* pVsffi;
    if ( ::VerQueryValue((void **)m_lpVersionData, _T("\\"),
                         (void**)&pVsffi, &nQuerySize) )
    {
        vsffi = *pVsffi;
        return TRUE;
    }

    return FALSE;
}

CString CFileVersion::GetFixedFileVersion()
{
    CString strVersion;
	VS_FIXEDFILEINFO vsffi;

    if ( GetFixedInfo(vsffi) )
    {
        strVersion.Format ("%u,%u,%u,%u",HIWORD(vsffi.dwFileVersionMS),
            LOWORD(vsffi.dwFileVersionMS),
            HIWORD(vsffi.dwFileVersionLS),
            LOWORD(vsffi.dwFileVersionLS));
    }
    return strVersion;
}

CString CFileVersion::GetFixedProductVersion()
{
    CString strVersion;
	VS_FIXEDFILEINFO vsffi;

    if ( GetFixedInfo(vsffi) )
    {
        strVersion.Format ("%u,%u,%u,%u", HIWORD(vsffi.dwProductVersionMS),
            LOWORD(vsffi.dwProductVersionMS),
            HIWORD(vsffi.dwProductVersionLS),
            LOWORD(vsffi.dwProductVersionLS));
    }
    return strVersion;
}
</tt></PRE></FONT>

 
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<p>Last updated: 2 April 1998

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