Printable View
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
I have found out the reason to cause this problom.
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 .Code: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 );
}
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
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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Right. you always need to paint onto the DC passed to you by Windows as andytim has suggested.