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How to find the name for interfaces implemented by a COM object

By , 2 Apr 2002
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Introduction

This is a class that helps you to find the interfaces implemented by a COM object. Here's how you can use that MsgBox method

QI::MsgBox( yourCOMObject ); 

Code Listing

#include <atlbase.h>
#include <string>
#include <sstream>
class QI : protected CRegKey,
#ifdef _UNICODE
    public std::wstringstream
#else
    public std::stringstream
#endif
{
protected:
    virtual tstring Query( IUnknown* pUnk )
    {
        if ( pUnk != NULL && ( ERROR_SUCCESS == 
            Open( HKEY_CLASSES_ROOT, _T("Interface") ) ) )
        {
            TCHAR szKeyName[1024] = _T("");
            for ( int i = 0; ERROR_SUCCESS == 
                RegEnumKey( m_hKey, i, szKeyName, 1024 ); i++ )
            {
                USES_CONVERSION;
                CLSID clsID = CLSID_NULL;
                if ( SUCCEEDED( CLSIDFromString( T2OLE(szKeyName), 
                    &clsID ) ) )
                {
                    CComPtr<IUnknown> spObject = NULL;
                    if ( SUCCEEDED( pUnk->QueryInterface( clsID, 
                        (void**)&spObject ) ) )
                    {
                        TCHAR szValue[1024] = _T(""); 
                        LONG ncbValue = 1024;
                        if ( ERROR_SUCCESS == RegQueryValue( m_hKey, 
                            szKeyName, szValue, &ncbValue ) )
                            *this << tstring(szValue) + _T("\r\n");
                    }
                }
            }
            Close();
        }
        return str();
    }

public:
    static void MsgBox( IUnknown* pUnk )
    {
        QI objQI;
        MessageBox( NULL, objQI.Query( pUnk ).c_str(),
            _T("The object implements:"), MB_ICONINFORMATION );
    }
};

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Mikelangelo
Web Developer
Romania Romania
No Biography provided

Comments and Discussions

 
GeneralMy vote of 1 Pinmembertha_specializt10-Jan-14 12:55 
GeneralExcellent Utility - Small and Cute PinmemberSharjith2-Apr-09 18:52 
GeneralCan't query clsid's PinmemberRené Greiner8-Apr-02 3:42 
GeneralRe: Can't query clsid's PinmemberMikelangelo8-Apr-02 8:21 
GeneralRe: Can't query clsid's PinmemberRené Greiner9-Apr-02 23:39 
*lol*
I don't think that IIDFromString gets the list of interfaces but I know that QueryInterface shouldn't be used with clsids like you use it!
You have to use IIDs, which are being asked by using IIDFromString, and not CLSIDFromString !
GeneralRe: Can't query clsid's PinmemberMikelangelo9-Apr-02 23:44 
GeneralRe: Can't query clsid's PinmemberMikelangelo9-Apr-02 23:51 
GeneralRe: Can't query clsid's PinmemberRené Greiner10-Apr-02 0:01 

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