Re: Unable to use SetClipboardData.

<shrikant.gura...@gmail.com> ha scritto nel messaggionews:cef1969e-54b2-4=

You may want to develop a couple of methods, one for retrieving text from
the clipboard, and the other one to copy the text to clipboard.
So, your worflow can be:

 1. call the method to get clipboard text data
 2. modify the text
 3. call the method to copy the new text to the clipboard

You might find useful a simple MFC application I developed to test these
concepts here:

http://www.geocities.com/giovanni.dicanio/vc/MfcClipboard.zip

The relevant code for methods implementing copy and paste operations
follows:

<code>

/////////////////////////////////////////////////////////////////////////=

// Copies input string to clipboard.
// Returns TRUE on success, FALSE on error.
/////////////////////////////////////////////////////////////////////////=

BOOL CMfcClipboardDlg::CopyStringToClipboard( IN const CString & str )
{
    // Open the clipboard
    if ( !OpenClipboard() )
        return FALSE;

    // Empty the clipboard
    if ( !EmptyClipboard() )
    {
        CloseClipboard();
        return FALSE;
    }

    // Number of bytes to copy (consider +1 for end-of-string, and
    // properly scale byte size to sizeof(TCHAR))
    SIZE_T textCopySize = (str.GetLength() + 1) * sizeof(TCHAR);

    // Allocate a global memory object for the text
    HGLOBAL hTextCopy = GlobalAlloc( GMEM_MOVEABLE, textCopySize );
    if ( hTextCopy == NULL )
    {
        CloseClipboard();
        return FALSE;
    }

    // Lock the handle, and copy source text to the buffer
    TCHAR * textCopy = reinterpret_cast< TCHAR *>( GlobalLock(
hTextCopy ) );
    ASSERT( textCopy != NULL );
    StringCbCopy( textCopy, textCopySize, str.GetString() );
    GlobalUnlock( hTextCopy );
    textCopy = NULL; // avoid dangling references

    // Place the handle on the clipboard
#if defined( _UNICODE )
    UINT textFormat = CF_UNICODETEXT; // Unicode text
#else
    UINT textFormat = CF_TEXT; // ANSI text
#endif // defined( _UNICODE )

    if (SetClipboardData( textFormat, hTextCopy ) == NULL )
    {
        // Failed
        CloseClipboard();
        return FALSE;
    }

    // Release the clipboard
    CloseClipboard();

    // All right
    return TRUE;

}

/////////////////////////////////////////////////////////////////////////=

// Retrieves clipboard text content.
// Returns TRUE on success, FALSE on error.
/////////////////////////////////////////////////////////////////////////=

BOOL CMfcClipboardDlg::RetreiveStringFromClipboard( OUT CString & str )
{
    // Clear output parameter
    str.Empty();

    // Try opening the clipboard
    if (! OpenClipboard())
    {
        // Error
        return FALSE;
    }

    // Select clipboard text format basing on project Unicode buildin=

#if defined( _UNICODE )
    UINT textFormat = CF_UNICODETEXT; // Unicode text
#else
    UINT textFormat = CF_TEXT; // ANSI text
#endif // defined( _UNICODE )

    // Retrieve clipboard text data
    HANDLE hClipboardData = GetClipboardData(textFormat);
    if (hClipboardData == NULL)
    {
        // Error
        CloseClipboard();
        return FALSE;
    }

    // Get pointer to text
    TCHAR * pszText = reinterpret_cast<TCHAR *>( GlobalLock(
hClipboardData ) );
    if (pszText == NULL)
    {
        // Error
        CloseClipboard();
        return FALSE;
    }

    // Deep copy clipboard text in string instance
    str = pszText;

    // Release the lock on clipboard data handle
    GlobalUnlock( hClipboardData );

    // Release clipboard access
    CloseClipboard();

    // All right
    return TRUE;

}

</code>

HTH,
Giovanni