OpenEuphoria

Re: wxPrint

• Posted by jacques deschênes <desja at globetro?t?r.net> Oct 03, 2007
• 703 views

Brian Clark wrote:
> 
> 
> Can someone post a simple (non-win32lib) example of printing to a printer?
> Also, I saw wxHtmlEasyPrinting in the wxWidgets doc.  How can I get this
> wrapped
> for use in wxEuphoria?

Hi Brian,
Printing under windows is quite involved, it can't be done in a few lines as the
following demo shows.
And this demo does the very basic as it doesn't implement a cancel dialog as it
should.
It doesn't compute the text metrics and doesn't get all the usefull printer
device capacities needed to format printed text proprerly.
But it works.

-- printing demo

include dll.e
include machine.e
constant gdi32 = open_dll("gdi32.dll")
constant comdlg32 = open_dll("comdlg32.dll")
--constant user32 = open_dll("user32.dll")


constant iDeleteDC =  define_c_func(gdi32,"DeleteDC",{C_UINT},C_UINT) --
argument = hdc
constant iPrintDlg =  define_c_func(comdlg32,"PrintDlgA",{C_POINTER},C_INT) --
argument is pointer PRINTDLG structure
constant iStartDoc =  define_c_func(gdi32,"StartDocA",{C_UINT,C_POINTER},C_INT)
-- argument1 is hdc, argument2 is pointer to DOCINFO
constant iStartPage = define_c_func(gdi32,"StartPage",{C_UINT},C_INT) --
argument is printer hdc
constant iEndPage =   define_c_func(gdi32,"EndPage",{C_UINT},C_INT) -- argument
is printer hdc
constant iEndDoc =    define_c_func(gdi32,"EndDoc",{C_UINT},C_INT) -- argument
is printer hdc
constant iGetDeviceCaps =
define_c_func(gdi32,"GetDeviceCaps",{C_UINT,C_INT},C_INT) -- argument1 is printer
hdc, argument2 one of dev. cap. constant
constant iTextOut =  
define_c_func(gdi32,"TextOutA",{C_UINT,C_INT,C_INT,C_POINTER,C_INT},C_INT) --
hdc, x,y, pString, nChar

constant PDLG_SIZE =  66 -- PRINTDLG structure size
constant  PD_USEDEVMODECOPIESANDCOLLATE=262144,PD_RETURNDC= 256

constant DOCINFO_SIZE =  20

constant HORZRES =8 ,  VERTRES = 10, LOGPIXELSY = 90

function GetDeviceCaps(atom hdc, atom Cap)
   return c_func(iGetDeviceCaps,{hdc,Cap})
end function

procedure StartDoc(atom hdc, sequence DocTitle)
object fnVal, pDocInfo, pTitle
  pTitle = allocate_string(DocTitle)
  pDocInfo = allocate(DOCINFO_SIZE)
  mem_set(pDocInfo,0,DOCINFO_SIZE)
  poke4(pDocInfo,DOCINFO_SIZE)
  poke4(pDocInfo+4,pTitle)
  fnVal = c_func(iStartDoc,{hdc,pDocInfo})
  free(pTitle)
  free(pDocInfo)
end procedure

procedure StartPage(atom hdc)
object fnVal
   fnVal = c_func(iStartPage,{hdc})
end procedure

procedure EndPage(atom hdc)
object fnVal
   fnVal = c_func(iEndPage,{hdc})
end procedure

procedure EndDoc(atom hdc)
object fnVal
   fnVal = c_func(iEndDoc,{hdc})
end procedure

procedure TextOut(atom hdc,integer x, integer y, sequence text)
atom fnVal, pText
  pText = allocate_string(text)
  fnVal = c_func(iTextOut,{hdc,x,y,pText,length(text)})
  free(pText)
end procedure

function PrinterSelect() -- this return the display context of printer.
atom fnVal,pPRINTDLG, hPrinterHdc

   pPRINTDLG= allocate(PDLG_SIZE)
   mem_set(pPRINTDLG,0,PDLG_SIZE)
   poke4(pPRINTDLG,PDLG_SIZE)
poke4(pPRINTDLG+20,or_bits(PD_USEDEVMODECOPIESANDCOLLATE,PD_RETURNDC)) --
   Flags
   fnVal = c_func(iPrintDlg,{pPRINTDLG})
   hPrinterHdc = 0
   if fnVal then 
     hPrinterHdc = peek4u(pPRINTDLG+16)--PRINTDLG.hdc
   end if
   free(pPRINTDLG)
   return hPrinterHdc  
end function 

constant TEXT="The quick brown fox jump over the lazy dog"
object void

integer vppi -- printer  pixel per inch vertical
atom hPrnDc 

-- 1) let the user select printer
hPrnDc = PrinterSelect()
if hPrnDc then
-- 2) Get printer vertical resolution in pixel per inch.
  vppi = GetDeviceCaps(hPrnDc,LOGPIXELSY)
-- 3) open document
  StartDoc(hPrnDc,"printing demo")
  StartPage(hPrnDc)  
-- 4) Begin a new page
  StartPage(hPrnDc)
-- 5) send data to printer
  for i = 1 to 10 do -- print 10 lines of text 6 lines per inches
    TextOut(hPrnDc,10,i*vppi/6,TEXT)
  end for
-- 6) end page
  EndPage(hPrnDc)
-- 7) Close Document
  EndDoc(hPrnDc)
-- 8) release printer DC
  void = c_func(iDeleteDC,{hPrnDc})
end if

regards,
Jacques Deschênes