WM_COPYDATA between two applications

Hello,

I'm running VC++ 2005.

I have two program and want to exchange some data, a string, between them.

In the sender program I have this function:

BOOL CFSGClientDlg::SendCommand(CString command)
{
    COPYDATASTRUCT cds;
    LRESULT rc;
    TCHAR *buf;

    buf = new TCHAR[MAX_COPY_LENGTH];
    memset(buf,'\0',MAX_COPY_LENGTH);
    _tcscpy_s(buf,MAX_COPY_LENGTH,sOrderno.GetBuffer());
    sOrderno.ReleaseBuffer();

    cds.dwData = 0;
    cds.cbData = sOrderno.GetLength()+1;
    cds.lpData = (void*)buf;

    rc = m_pSCMLaserCWnd->SendMessage(WM_COPYDATA,
        (WPARAM)AfxGetApp()->m_pMainWnd->GetSafeHwnd(),
        (LPARAM)&cds);

    if (rc ==NULL)
    {
        DWORD errcode = GetLastError();
        return false;
    } // if (rc==NULL)
    return true;
}

And in the receiver program I have this:

BOOL CMainFrame::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
{
    CString sData=(TCHAR*)(pCopyDataStruct->lpData);
.... doing stuff with sData...
    return CFrameWnd::OnCopyData(pWnd, pCopyDataStruct);
}

I can see that the string I send is OK, but when I get to the receiving
part I get a couple of characters correkt and then just rubbish...

What have I done wrong?

// Anders
--
English is not my first, or second, language
so anything strange, or insulting, is due to
the translation.
Please correct me so I may improve my English!