problems with Image() in wxPDFdocument

BlitzMax Forums/Brucey's Modules/problems with Image() in wxPDFdocument

nadia

(Posted 2008) [#1]

When I run this code I get an 'Unhandled Memory Exception' Error. But the pdfdocument.bmx in the samples folder runs fine. I just can't get my head around this :-(

SuperStrict

Import wx.wxPdfDocument
Import wx.wxApp
Import brl.filesystem

Extern "win32"
	'Function WinExec(lpCmdLine$z, nCmdShow)
	Function ShellExecuteA(hwnd:Int, op:Byte Ptr, file:Byte Ptr, param:Byte Ptr, dir:Byte Ptr, show:Int) 
End Extern

' run the test
test() 

Function test() 
	Local doc:wxPdfDocument = New wxPdfDocument.Create() 
	doc.AddPage() 
	doc.SetFont("Arial", "B", 24) 
	doc.Cell(0, 20, "Testing Image drawing", 0, 0, wxPDF_ALIGN_CENTER) 
	
	' image width
	Local w:Double = 25
	
	' image file name
	Local sImg:String = "apple.gif"

	' draw a testing rectangle - this works
	'doc.Rect((doc.GetPageWidth() - w) / 2, doc.GetY() + 20, w, w) 
	
	' check if the file exists
	If Not FileExists(sImg) 
		DebugLog "Can't find image file: " + sImg
	Else
		' draw an image which is located in the same folder as this testing file
		' this produces a 'Unhandled Memory Exception Error' in wxPDFdocument.bmx
		doc.Image(sImg, (doc.GetPageWidth() - w) / 2, doc.GetY() + 20, w) 
	End If
	
	' save the pdf file
	Local fn:String = "image-test.pdf"
	doc.SaveAsFile(fn) 
	
	' open the pdf file with the default reader
	ShellExecuteA(0, "open", "~q" + fn + "~q", "", Null, 1) 
End Function

Function FileExists:Int(fn:String) 
	If FileType(fn) = 1 Return True
	Return False
End Function

Thanx for any help!

Brucey

(Posted 2008) [#2]

Rather than running test() like that, you should probably do it from inside wxMax :

New MyApp.run()


Type MyApp Extends wxApp

	Method OnInit:Int()
		test()
	End Method
	
End Type

I imagine that wxWidgets has things it needs to initialize, and without kicking off a wxApp instance it never gets the chance to.

Oh, and interestingly, if your gif has alpha transparency Acrobat Reader won't show it (at least on my v7 it won't).

:o)

nadia

(Posted 2008) [#3]

Wow!!! Thanx so much, it works now! Brucey, your support is just fantastic!

I've tried a gif with alpha and another with index transparency but my version of Acrobat Reader (v8) won't show any of them. PNG pics with alpha works fine.

Brucey

(Posted 2008) [#4]

Try a gif with no transparency at all - worked fine here.

Mind you, these days you probably want to stay away from gifs altogether. You can always convert them to something better ;-)

nadia

(Posted 2008) [#5]

Yup, gif's with no transparency work ok but as you say, gif's are not worth the trouble anymore and I converted that beautiful green apple into a PNG32 file, drilled a big whole into it and alpha masked the shadow and it renders great in the pdf doc!

Brucey

(Posted 2008) [#6]

Nadia, you could, btw, use OpenURL() to open the PDF for you. This should work on Linux and Mac too.
...rather than tying yourself to platform specific code ;-)

nadia

(Posted 2008) [#7]

Thanx for the tip about OpenURL()! The nice part about ShellExecuteA(), which I used in the code above is, that I can replace the "open" parameter with "print" and it will send my pdf file direct to the default printer (via Acrobat Reader). But yes, it is win32 specific code :-(