C / C++ / MFC

void MyApp::InvalidateAllViews()
{

    // Get position of first document template
    POSITION pos = m_pDocManager->GetFirstDocTemplatePosition();
    while( pos )
    {
        // Get pointer to document template
        CDocTemplate* pTemplate = m_pDocManager->GetNextDocTemplate(pos);
        // Get position of first document using template
        POSITION pos2 = pTemplate->GetFirstDocPosition();
        while( pos2 )
        {
            // Get pointer to document
            CMyDoc* pDoc = (CMysDoc*)(pTemplate->GetNextDoc(pos2));
            if( pDoc )
            {
                // Get position of first view
                POSITION pos3 = pDoc->GetFirstViewPosition();
                while( pos3 )
                {
                    // Get pointer of next view
                    CMyView* pView = (CVMyView*)(pDoc->GetNextView(pos3));
                    pView->Invalidate();
                }
            }
        }
    }
}

static UINT indicators[] ={ID_SEPARATOR};

m_wndStatusBar.Create(this);
m_wndStatusBar.SetIndicators(indicators,sizeof(indicators)/sizeof(UINT));

CFileDialog dlg(TRUE);
char szFile[MAX_PATH] = "myfile.txt";
dlg.m_ofn.lpstrFile = szFile;
dlg.m_ofn.nMaxFile = sizeof(szFile);
dlg.DoModal();

TCHAR buffer[256] = {0};
_tcscpy(buffer, _T("MyFile.txt"));
my_file_dlg.m_ofn.lpstrFile = buffer;
my_file_dlg.m_ofn.nMaxFile = 256;