Documens was'n printed out but could preview?

[v120160]

I made a simple Single Doc-View application and let the VC++ to handle the printing job.
when I select [Print] command from the menu , and select a printer to print out the document , nothing came out from the printer. but I can preview the document by select the buildin [print preview] command from the menu.
what may cause this kind of problom?

Thanks for any reply


Jeff

[v120160]

I have found out the reason to cause this problom.

void CCBCView::OnDraw(CDC* pDC)
{
    CCADIODoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    // TODO: add draw code for native data here
    drawsomething( pDC->m_hDC );
}

void void CCBCView::drawsomething(  HDC hdc )
{
    CDC dc;
    dc.Attach( hdc );   // <<------ this cause error !!!!
    dc.TextOut( hdc , "PRINT TEST" , 10 );
}

Once I construct a new CDC , and attach to the original CDC's handle that pass into OnDraw function . This App display in right way on the screen, but cannot print out any more .

[Roger Allen]

You probably need to call Detach() on the CDC object as by default CDC destructor is probbaly trying to delete teh DC, thus invalidating the print job in some way

[andytim]

I think you should also consider to change the param of method drawsomething( HDC hdc ) from HDC hdc to CDC *pDC.

Jack

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[kirants]

Right. you always need to paint onto the DC passed to you by Windows as andytim has suggested.