wxPostscriptDC problems

wxPython Users
1

Quoting Andrew Jones <arjones6@gmail.com>:

I have an application where I create a graph that I need to be able to print
to postscript in order to collate it with some other postscript I generate.
On linux I was able to get this to work by going through the print framework
to print to a file without prompting the user. When I port this to windows
however, the print framework uses a wx.PrinterDC instead of the
wx.PostscriptDC so instead of postscript I get some unusable printer code.
I'm trying to just create my own wx.PostscriptDC and plot directly to that,
but I keep getting an error message complaining of an 'invalid postscript
dc'. Does anybody know how to either force windows to use the PostScriptDC,
or how to use a PostScriptDC directly?

Here is my attempt to use a PostscriptDC directly:

def OnPrint(s, evt):
    printData = wx.PrintData()
    printData.SetPaperId(wx.PAPER_LETTER)
    printData.SetPrintMode(wx.PRINT_MODE_FILE)

    tf = tempfile.mktemp(".ps")
    printData.SetFilename(tf)
    dc = wx.PostScriptDC(printData)

    dc.StartPage()
    s.Plot(dc)
    dc.EndPage()
    s.disp.ViewPSFile(tf)

The wx.PostScriptDC requires that you call dc.StartDoc. That's where
it creates the output file (and assigns it to the m_pstream variable
you see mentioned in the exception message.) Call EndDoc when you are
done, to write the last bits to the file and close it.

···

--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!

2

That fixed it. Thanks a lot!

Andrew

···

On Thu, Apr 24, 2008 at 8:56 PM, Robin Dunn robin@alldunn.com wrote:

Quoting Andrew Jones arjones6@gmail.com:

I have an application where I create a graph that I need to be able to print

to postscript in order to collate it with some other postscript I generate.

On linux I was able to get this to work by going through the print framework

to print to a file without prompting the user. When I port this to windows

however, the print framework uses a wx.PrinterDC instead of the

wx.PostscriptDC so instead of postscript I get some unusable printer code.

I’m trying to just create my own wx.PostscriptDC and plot directly to that,

but I keep getting an error message complaining of an 'invalid postscript

dc’. Does anybody know how to either force windows to use the PostScriptDC,

or how to use a PostScriptDC directly?

Here is my attempt to use a PostscriptDC directly:

def OnPrint(s, evt):

printData = wx.PrintData()

printData.SetPaperId(wx.PAPER_LETTER)

printData.SetPrintMode(wx.PRINT_MODE_FILE)



tf = tempfile.mktemp(".ps")

printData.SetFilename(tf)

dc = wx.PostScriptDC(printData)



dc.StartPage()

s.Plot(dc)

dc.EndPage()

s.disp.ViewPSFile(tf)

The wx.PostScriptDC requires that you call dc.StartDoc. That’s where

it creates the output file (and assigns it to the m_pstream variable

you see mentioned in the exception message.) Call EndDoc when you are

done, to write the last bits to the file and close it.

–

Robin Dunn

Software Craftsman

http://wxPython.org Java give you jitters? Relax with wxPython!

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