Detect printer change in CPrintDialog
Michael E. Kropp -- mkropp@imagesw1.MV.COM
Tuesday, July 02, 1996
Environment: MSVC 4.1 Win95/Win32s
I'm expanding CPrintDialog to include some options like Fit-to-page, =
etc. When the user clicks the Properties button he has the capability =
of change paper size, orientation, etc. I have yet to find a way to get =
any updated information while the print dialog is still up (I'm trying =
to display the printed size, etc. in the dialog). The DEVMODE structure =
seems to get updated when I leave the print dialog but not when I come =
back to it from a jaunt to Properties...
I haven't been able to find anything on the VC++, MSVC CDs or on the =
Internet. Any suggestions on how this might be done?
Mike Kropp
Image Software
Roger Onslow -- Roger_Onslow@compsys.com.au
Monday, July 08, 1996
>I'm expanding CPrintDialog to include some options like Fit-to-page, etc.
>When the user clicks the Properties button he has the capability of
>change paper size, orientation, etc.
>I have yet to find a way to get any updated information while the print dialog
is still up
>(I'm trying to display the printed size, etc. in the dialog).
>The DEVMODE structure seems to get updated when I leave the print dialog
>but not when I come back to it from a jaunt to Properties...
I have an application that has similar requirements.
Rather that fiddling about with extending CPrintDialog, I took the "easy" way
out and simply pop up a dialog after the standard dialog to specify print
position (shere laziness, I guess).
I'd much rather do it the right way by extending the print dialog (probably
adding a button and popping up my print position dialog, which coincidentally
looks very much like the one used in Microsoft Image from Office CD).
If you find a way of doing this, please let me know how...
If you like, I could let you have a look at my code, but it probably won't
help, as you need the info from within the print dialog (not after).
/|\ Roger Onslow
____|_|.\ ============
_/.........\Senior Software Engineer
/CCC.SSS..A..\
/CC..SS...A.A..\ Computer
/.CC...SS..AAA...\ Systems
/\.CC....SSAA.AA../ Australia
\ \.CCCSSS.AA.AA_/
\ \...........// Ph: +61 49 577155
\ \...._____// Fax: +61 49 675554
\ \__|_/\_// RogerO@compsys.com.au
\/_/ \//
Lee Jonas -- lj@turnpike.com
Friday, July 12, 1996
In message <9607090024.AA7579@acacia.compsys.com.au>, Roger
Onslow/Newcastle/Computer Systems Australia/AU
writes
>>I'm expanding CPrintDialog to include some options like Fit-to-page, etc.
>>When the user clicks the Properties button he has the capability of
>>change paper size, orientation, etc.
>>I have yet to find a way to get any updated information while the print dialog
>is still up
>>(I'm trying to display the printed size, etc. in the dialog).
>>The DEVMODE structure seems to get updated when I leave the print dialog
>>but not when I come back to it from a jaunt to Properties...
>
>I have an application that has similar requirements.
>
>Rather that fiddling about with extending CPrintDialog, I took the "easy" way
>out and simply pop up a dialog after the standard dialog to specify print
>position (shere laziness, I guess).
>
>I'd much rather do it the right way by extending the print dialog (probably
>adding a button and popping up my print position dialog, which coincidentally
>looks very much like the one used in Microsoft Image from Office CD).
>
>If you find a way of doing this, please let me know how...
>
>If you like, I could let you have a look at my code, but it probably won't
>help, as you need the info from within the print dialog (not after).
>
> /|\ Roger Onslow
> ____|_|.\ ============
> _/.........\Senior Software Engineer
> /CCC.SSS..A..\
> /CC..SS...A.A..\ Computer
> /.CC...SS..AAA...\ Systems
>/\.CC....SSAA.AA../ Australia
>\ \.CCCSSS.AA.AA_/
> \ \...........// Ph: +61 49 577155
> \ \...._____// Fax: +61 49 675554
> \ \__|_/\_// RogerO@compsys.com.au
> \/_/ \//
>
>
The problem lies with the implementation of the PRINTDLG common dialog
that CPrintDialog is a wrapper class for.
PRINTDLG takes a DEVMODE struct that it uses to initialise its fields,
displays the modal dialog, then refills the DEVMODE struct with the
user's changes when the user closes the dialog.
This means you cannot get information on the state of the dialog's
controls from the pd.m_pd.hDevMode struct whilst it is running, and as
most of the CPrintDialog member functions retrieve information from this
DEVMODE struct, they are also no good at this point.
Hence you must tap into the print dialog directly: In your
MyPrintDialog class, add control notification handlers for the controls
you are interested in (look in commdlg.rc for their IDs, eg. Paper Size
combo is "cmb2", Orientation Radiobuttons are "rad1" & "rad2", etc).
These handlers can then check to see the states of the relevant common
controls and update your own controls accordingly.
Eg. add ON_CBN_SELCHANGE(cmb2, OnUpdatePrintedSizeDisplay),
ON_BN_CLICKED(rad1, OnUpdatePrintedSizeDisplay), and ON_BN_CLICKED(rad2,
OnUpdatePrintedSizeDisplay). Then:
void MyPrintDialog::OnUpdatePrintedSizeDisplay()
{
// get data from Paper Size & Orientation controls
...
// update display control
...
}
NB: to get the value of the paper size from the selected combobox
string, take a look at DeviceCapabilities with DC_PAPERNAMES, DC_PAPERS,
and DC_PAPERSIZES. These functions are used to fill in three arrays,
one with the name of the paper sizes, one with the dmPaperSize
identifiers, and one with the actual dimensions of these paper sizes
respectively. All three arrays correspond to each other, ie. the same
index value used in all arrays gives you the name, id, and dimensions of
a particular supported paper type. You can match the selected combobox
string to the identifier using the DC_PAPERNAMES and DC_PAPERS arrays.
Furthermore, if the user has selected a non-standard paper type (eg.
"custom" in MS-Word) you can also get information on that paper type's
dimensions from the DC_PAPERSIZES array.
Don't forget to call DeviceCapabilities on the correct driver - the user
may have changed the printer selected in the "Specific Printer"
combobox. In order to do this, look at the pd.m_pd.hDevNames handle.
This is a handle to a DEVNAMES struct which specifies the printer name
currently selected, its associated driver, and the port it is attached
to. The print dialog changes pd.m_pd.hDevMode as soon as the user
changes the printer selection combobox in the dialog, so it is never out
of date.
I hope this helps...
-------------------------------------------------------------------------
Lee Jonas, T U R N P I K E Ltd
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