[Mono-list] GDI+ and Mono 2.0.1

[Sebastien Pouliot]

On Wed, 2009-02-04 at 19:27 +0100, Bálint Kardos wrote:
> Hi Sebastien,
> 
> 
> thanks for your reply!
> I only want to deploy it on the Linux server, so I'm working on this
> part first.
> 
> 
> I found the solution, it had no rights to write to a given folder.

Yep, a bit lame but this is how GDI+/SD reports such permission issues.

>  It now executes, but the output file is just 192 bytes long, and only
> has the header of the PNG stream.

My previous suggestion still applies. Once you have a small EXE it will
be much easier to debug (and/or trace) to see what's going on.

> The whole process is the following:
> 
> 
> 1)  open a 24bit PNG file
> 2)  add the text
> 3)  save the file to a given directory
> 4)  send it to the out stream
> 
> 
> Image.FromFile would throw an exception if it would not find the
> original file,
> the TextWriter would throw an exception if it would not find the font,

TextWriter / font ? not likely ;-)

> so I can't find any reason why it's not working.

Try to remove step 2 (adding the text) and see if a copy of the original
file is saved (or just an header).

> 
> I don't know, possibly I'm missing some required .so files?
> I installed everything from the mono packages, and have libpng
> installed as well.

Possible but unlikely, since you would have hit an exception (or a
crash).

> 
> 
> 
> 
> üdvözlettel
> with regards
> 
> Kardos Bálint
> _______________________________________
> http://skaelede.hu 10 (0xA) év a magyar weben
> 
> 
> On Wed, Feb 4, 2009 at 19:12, Sebastien Pouliot
> <sebastien.pouliot at gmail.com> wrote:
>         On Wed, 2009-02-04 at 18:55 +0100, Bálint Kardos wrote:
>         > Hi,
>         >
>         >
>         > I have written a small HttpHandler which automatically
>         generates text
>         > on the fly with a custom font, added to the
>         > System.Drawing.Font.PrivateFontCollection.
>         >
>         >
>         > with Ms.net 3.5sp1, it works fine.
>         >
>         >
>         > with Mono 2.0.1,
>         > on Vista, it dies with:
>         >
>         >
>         > Stacktrace:
>         >
>         >
>         >   at (wrapper managed-to-native)
>         > System.Drawing.GDIPlus.GdipDeletePrivateFontCollection
>         (intptr&)
>         > <0x00004>
>         >   at (wrapper managed-to-native)
>         > System.Drawing.GDIPlus.GdipDeletePrivateFontCollection
>         (intptr&)
>         > <0xffffffff>
>         >   at System.Drawing.Text.PrivateFontCollection.Dispose
>         (bool)
>         > [0x00015] in C:\cygwin\tmp\monobuild\build\BUILD\mono-2.0.1
>         \mcs\class
>         > \System.Drawing\System.Drawing.Text
>         \PrivateFontCollection.cs:80
>         >
>         >
>         >
>         >
>         > on Linux, it dies with:
>         >
>         >
>         > System.Exception: Generic Error [GDI+ status: GenericError]
>         >   at System.Drawing.GDIPlus.CheckStatus (Status status)
>         [0x00000]
>         >   at System.Drawing.Image.Save (System.String filename,
>         System.Drawing.Imaging.ImageCodecInfo encoder,
>         System.Drawing.Imaging.EncoderParameters encoderParams)
>         [0x00000]
>         >   at System.Drawing.Image.Save (System.String filename,
>         System.Drawing.Imaging.ImageFormat format) [0x00000]
>         >
>         > none of the which are further traceable.
>         
>         
>         This is likely two different issues. I recall (it was a
>         _long_ time
>         ago) some win32 specific behavior wrt PrivateFontCollection -
>         explaining the first case.
>         
>         I suspect the later error (on Linux) is due to something else.
>         
>         > Any clues on how to further debug?
>         > thank you,
>         
>         
>         Try to create a test case outside your HTTP handler (i.e. a
>         small EXE).
>         Then use "mono --debug app.exe" to get a bit more information
>         and fill a
>         bug report on http://bugzilla.novell.com
>         
>         Thanks,
>         Sebastien
>         
>         
> 
>