Desktop-as-a-Service Designed for Any Cloud ? Nutanix Frame

from Israel. This article has some information about COMCTL32.DLL and Unimodem/V TAPI drivers in specific and code to determine the version of any DLL through your MFC application.

COMCTL32.DLL versions

This DLL is responsible for all the controls Windows uses. Windows 95 was first shipped with version 4.00 of this DLL. Internet explorer 3.x upgrades this DLL to version 4.70 and Internet explorer 4.0 to version 4.71.

Extended controls features (like List view controls with checkboxes) are supported only in versions bigger than 4.00.

An article about common control versions can be found at:


Unimodem is the standard modem driver used by TAPI. More than 95% percent of the "drivers" supplied with the modem hardware are just parameters files for that driver. Unimodem's 32-bit driver is located in UMDM32.DLL in the SYSTEM directory.

Recently, Microsoft has published an upgrade for Voice modems. This upgrade is called UnimodemV (V for voice). This upgrade supports advanced features like Caller-ID, Distinctive-Ring etc.

The upgrade can be downloaded from:

The original version of Unimodem is UMDM32.DLL version 4.00. UnimodemV replaces this DLL with version 4.10.

How to find the version of a DLL ?

The following class retrieves DLL versions.

Class header file:

/*  For some odd reason, Microsoft published a sample code that uses shlwapi.h 
    (and shlwapi.lib)
    to tinker file versions.

    This header file could not be found anywhere !!!
    Not in Visual C++ 4.2, Visual C++ 5.0 or MSDN versions up to July 97`.

    So, I just took out the interesting structures from scraps I found 
    and re-defined them here.

//  Remember: You must link version.lib to the project for this class to work !!

#ifndef _DLL_VERSION_H_
#define _DLL_VERSION_H_

typedef struct _DllVersionInfo
    DWORD cbSize;
    DWORD dwMajorVersion;
    DWORD dwMinorVersion;
    DWORD dwBuildNumber;
    DWORD dwPlatformID;


class CDLLVersion
    typedef enum {  WIN_DIR, // Windows directory (e.g.: "C:\Windows\")
                    SYS_DIR, // Windows system directory (e.g.: "C:\Windows\System")
                    CUR_DIR, // Current directory (e.g.: ".")
                    NO_DIR}  // No directory (path in file name)
        FileLocationType;   // Possible ways to add a path prefix to a file

    CDLLVersion (LPSTR szDLLFileName) :
        m_dwMajor (0),
        m_dwMinor (0),
        m_dwBuild (0)
        m_bValid = GetDLLVersion (szDLLFileName, m_dwMajor, m_dwMinor, m_dwBuild);

    virtual ~CDLLVersion () {};

    DWORD GetMajorVersion ()
        return m_dwMajor;

    DWORD GetMinorVersion ()
        return m_dwMinor;

    DWORD GetBuildNumber ()
        return m_dwBuild;

    BOOL IsValid ()
        return m_bValid;


    BOOL GetDLLVersion (LPSTR szDLLFileName, 
                        DWORD &dwMajor, DWORD &dwMinor, DWORD &dwBuildNumber);

    BOOL CheckFileVersion (LPSTR szFileName, FileLocationType FileLoc, 
                           DWORD &dwMajor, DWORD &dwMinor, DWORD &dwBuildNumber);

    BOOL ParseVersionString (LPSTR lpVersion, 
                             DWORD &dwMajor, DWORD &dwMinor, DWORD &dwBuildNumber);

    BOOL FixFilePath (char * szFileName, FileLocationType FileLoc);

    DWORD   m_dwMajor,      // Major version number
            m_dwMinor,      // Minor version number
            m_dwBuild;      // Build number
    BOOL    m_bValid;       // Is the DLL version information valid ?


And here's the implementation:

#include "DLLVersion.h"


   Function:   GetDLLVersion

   Purpose:    Retrieves DLL major version, minor version and build numbers

   Input:      DLL file name
               Reference to Major number 
               Reference to Minor number 
               Reference to Build number 

   Output:     TRUE only if successful

   Remarks:    This function first tries to get the DLL version the nice way,
               that is, call the DllGetVersion function in the DLL.

               If this fails, it tries to located the DLL file in the file system,
               read the file information block and retrieve the file version.

BOOL CDLLVersion::GetDLLVersion (LPSTR szDLLFileName, 
                                 DWORD &dwMajor, DWORD &dwMinor, DWORD &dwBuildNumber)
HINSTANCE   hDllInst;           // Instance of loaded DLL
char szFileName [_MAX_PATH];    // Temp file name
BOOL bRes = TRUE;               // Result

    lstrcpy (szFileName, szDLLFileName);    // Save a file name copy for the loading
    hDllInst = LoadLibrary(TEXT(szFileName));   //load the DLL
    if(hDllInst) {  // Could successfully load the DLL
        DLLGETVERSIONPROC pDllGetVersion;
        You must get this function explicitly because earlier versions of the DLL 
        don't implement this function. That makes the lack of implementation of the 
        function a version marker in itself.
        pDllGetVersion = (DLLGETVERSIONPROC) GetProcAddress(hDllInst,
        if(pDllGetVersion) {    // DLL supports version retrieval function
            DLLVERSIONINFO    dvi;

            ZeroMemory(&dvi, sizeof(dvi));
            dvi.cbSize = sizeof(dvi);
            HRESULT hr = (*pDllGetVersion)(&dvi);

            if(SUCCEEDED(hr)) { // Finally, the version is at our hands
                dwMajor = dvi.dwMajorVersion;
                dwMinor = dvi.dwMinorVersion;
                dwBuildNumber = dvi.dwBuildNumber;
            } else
                bRes = FALSE;   // Failure
        } else  // GetProcAddress failed, the DLL cannot tell its version
            bRes = FALSE;       // Failure

        FreeLibrary(hDllInst);  // Release DLL
    } else  
        bRes = FALSE;   // DLL could not be loaded

    if (!bRes) // Cannot read DLL version the nice way 
        return CheckFileVersion (szFileName, SYS_DIR, 
                                 dwMajor, dwMinor, dwBuildNumber); // Try the ugly way
        return TRUE;


   Function:   CheckFileVersion

   Purpose:    Check the version information of a given file

   Input:      File name
               File location (Windows dir, System dir, Current dir or none)
               Reference to Major number 
               Reference to Minor number 
               Reference to Build number 

   Output:     TRUE only if successful

   Remarks:    Trashes original file name

BOOL CDLLVersion::CheckFileVersion (LPSTR szFileName, FileLocationType FileLoc, 
                                    DWORD &dwMajor, DWORD &dwMinor, 
                                    DWORD &dwBuildNumber)
LPSTR   lpVersion;			            // String pointer to 'version' text
UINT    uVersionLen;
DWORD   dwVerHnd=0;			            // An 'ignored' parameter, always '0'

    FixFilePath (szFileName, FileLoc);  // Add necessary path prefix to file name

    DWORD dwVerInfoSize = GetFileVersionInfoSize (szFileName, &dwVerHnd);
    if (!dwVerInfoSize)     // Cannot reach the DLL file
        return FALSE;

    LPSTR lpstrVffInfo = 
           (LPSTR) malloc (dwVerInfoSize);  // Alloc memory for file info
    if (lpstrVffInfo == NULL)
        return FALSE;   // Allocation failed

        // Try to get the info
    if (!GetFileVersionInfo(szFileName, dwVerHnd, dwVerInfoSize, lpstrVffInfo)) {
        free (lpstrVffInfo);
        return FALSE;   // Cannot read the file information - 
                        // wierd, since we could read the information size
		/* The below 'hex' value looks a little confusing, but
		   essentially what it is, is the hexidecimal representation
		   of a couple different values that represent the language
		   and character set that we are wanting string values for.
		   040904E4 is a very common one, because it means:
			 US English, Windows MultiLingual characterset
		   Or to pull it all apart:
		   04------        = SUBLANG_ENGLISH_USA
		   --09----        = LANG_ENGLISH
		   ----04E4 = 1252 = Codepage for Windows:Multilingual

    if (!VerQueryValue (    lpstrVffInfo,  
                (LPSTR) (TEXT("\\StringFileInfo\\040904E4\\FileVersion")), 
                (LPVOID *)&lpVersion, (UINT *)&uVersionLen)) {
        free (lpstrVffInfo);
        return FALSE;     // Query was unsuccessful

    // Now we have a string that looks like this :
    // "MajorVersion.MinorVersion.BuildNumber", so let's parse it

    BOOL bRes = ParseVersionString (lpVersion, dwMajor, dwMinor, dwBuildNumber);
    free (lpstrVffInfo);
    return bRes;


   Function:   ParseVersionString

   Purpose:    Parse version information string into 3 different numbers

   Input:      The version string formatted as "MajorVersion.MinorVersion.BuildNumber"
               Reference to Major number 
               Reference to Minor number 
               Reference to Build number 

   Output:     TRUE only if successful


BOOL CDLLVersion::ParseVersionString (LPSTR lpVersion, 
                                      DWORD &dwMajor, DWORD &dwMinor, 
                                      DWORD &dwBuildNumber)
        // Get first token (Major version number)
    LPSTR token = strtok( lpVersion, TEXT (".") );  
    if (token == NULL)  // End of string
        return FALSE;       // String ended prematurely
    dwMajor = atoi (token);

    token = strtok (NULL, TEXT ("."));  // Get second token (Minor version number)
    if (token == NULL)  // End of string
        return FALSE;       // String ended prematurely
    dwMinor = atoi (token);

    token = strtok (NULL, TEXT ("."));  // Get third token (Build number)
    if (token == NULL)  // End of string
        return FALSE;       // String ended prematurely
    dwBuildNumber = atoi (token);

    return TRUE;


   Function:   FixFilePath

   Purpose:    Adds the correct path string to a file name according 
               to given file location 

   Input:      Original file name
               File location (Windows dir, System dir, Current dir or none)

   Output:     TRUE only if successful

   Remarks:    Trashes original file name

BOOL CDLLVersion::FixFilePath (char * szFileName, FileLocationType FileLoc)
    char    szPathStr [_MAX_PATH];      // Holds path prefix
    switch (FileLoc) {
        case WIN_DIR:
                // Get the name of the windows directory
            if (GetWindowsDirectory (szPathStr, _MAX_PATH) ==  0)  
                return FALSE;   // Cannot get windows directory

        case SYS_DIR:
                // Get the name of the windows SYSTEM directory
            if (GetSystemDirectory (szPathStr, _MAX_PATH) ==  0)  
                return FALSE;   // Cannot get system directory

        case CUR_DIR:
                // Get the name of the current directory
            if (GetCurrentDirectory (_MAX_PATH, szPathStr) ==  0)  
                return FALSE;   // Cannot get current directory

        case NO_DIR:
            lstrcpy (szPathStr,"");

            return FALSE;
    lstrcat (szPathStr, _T("\\"));
    lstrcat (szPathStr, szFileName);
    lstrcpy (szFileName, szPathStr);
    return TRUE;

Email address for Eran Yariv updated on: April 11, 98.


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