SHAutoComplete API return fail

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I want to set Auto complete property to my Combobox. For that iam use SHAutoComplete API of windows.I know this api is used for Instructs system edit controls to use AutoComplete to help complete URLs or file system paths. To set autocomplete to combbox, iam use edit control inside the combobox has a control ID 1001. Use the GetDlgItem() function with this ID to get the handle of the edit control. the code section is below.

C++

BOOL CAutocompleteDlg::OnInitDialog()
{
    CWnd* pEditCombo = m_Combo.GetDlgItem( 1001 );
    if( pEditCombo )
    {
        HRESULT hRes = SHAutoComplete( pEditCombo->m_hWnd, SHACF_FILESYSTEM );
        if( S_OK != hRes )
        {
            AfxMessageBox( _T( "Failed" ));
        }
    }
    return TRUE;
}

here m_Combo is the object of CComboBox. But when execute the program SHAutoComplete API return fail. why?

Posted 6-Dec-12 21:52pm

Sajeesh Payolam

Updated 6-Dec-12 21:53pm

v2

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Comments

Jochen Arndt 7-Dec-12 4:20am

What is the value of hRes?

To get the handle of the edit control you can use GetComboBoxInfo().

[no name] 7-Dec-12 4:58am

I think API need some more information also. I also try GetComboBox info. stil it failed. Thanks for your reply

Jochen Arndt 7-Dec-12 5:19am

The note about GetComboBoxInfo() was just a hint. It will not solve your problem.

To solve your problem, check the hRes value. It is an error code that will tell you what is wrong.

A common error is forgetting to call CoInitialize(), OleInitialize(), or AfxOleInit().

[no name] 7-Dec-12 5:41am

thanks jochen. Actualy i forgot to call CoInitialize(). thanks..I think you can add it as a solution. Then it will be usefull for others. thank you very much

Jochen Arndt 7-Dec-12 6:03am

Thank you for your feedback. I have added a solution. You may accept it to mark the question as solved.

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Jochen Arndt · Accepted Answer · 2012-12-07T00:02:00

Solution 1

The discussion from the comments section leads to the solution:

A common error is forgetting to call CoInitialize(), OleInitialize(), or AfxOleInit(). One of these must be called before using functions from COM libraries like SHAutoComplete().

Posted 7-Dec-12 0:02am

Jochen Arndt