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

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2.29/5 (8 votes)
2 Apr 2002 99.9K   46   8
The article descibes how can you find the interfaces implemented by a COM object

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

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Comments and Discussions

 
GeneralMy vote of 1 Pin
tha_specializt10-Jan-14 12:55
tha_specializt10-Jan-14 12:55 
GeneralExcellent Utility - Small and Cute Pin
Sharjith2-Apr-09 18:52
professionalSharjith2-Apr-09 18:52 
GeneralCan't query clsid's Pin
René Greiner8-Apr-02 3:42
René Greiner8-Apr-02 3:42 
GeneralRe: Can't query clsid's Pin
Mikelangelo8-Apr-02 8:21
Mikelangelo8-Apr-02 8:21 
GeneralRe: Can't query clsid's Pin
René Greiner9-Apr-02 23:39
René Greiner9-Apr-02 23:39 
GeneralRe: Can't query clsid's Pin
Mikelangelo9-Apr-02 23:44
Mikelangelo9-Apr-02 23:44 
GeneralRe: Can't query clsid's Pin
Mikelangelo9-Apr-02 23:51
Mikelangelo9-Apr-02 23:51 
GeneralRe: Can't query clsid's Pin
René Greiner10-Apr-02 0:01
René Greiner10-Apr-02 0:01 

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