webkit-image compilation under MacOS X

[axel.roeslein@…]

I tried to use the wsmplugin with josm running under MacOS X (Java 1.5 or Java 1.6).
This doesn't work properly with Yahoo images because of a missing "webkit-image"
installation.

No I tried to build this myself. I got Apple's Developer Tools plus a fresh download of Qt 4.5

This run's fine:

moc webkit-image.cpp >webkit-image.h

This doesn't work though:

g++ webkit-image.cpp -o webkit-image -lQtCore -lQtWebKit -lQtGui -O2 \
-L/Developer/Applications/Qt/QtCreator.app/Contents/Frameworks

Undefined symbols:

"QNetworkAccessManager::setProxy(QNetworkProxy const&)", referenced from:

_main in ccIMD9Hd.o

"QNetworkProxy::setType(QNetworkProxy::ProxyType)", referenced from:

_main in ccIMD9Hd.o

"QNetworkProxy::~QNetworkProxy()", referenced from:

_main in ccIMD9Hd.o
_main in ccIMD9Hd.o

"QNetworkProxy::setHostName(QString const&)", referenced from:

_main in ccIMD9Hd.o

"QNetworkProxy::setPort(unsigned short)", referenced from:

_main in ccIMD9Hd.o

"QNetworkProxy::QNetworkProxy()", referenced from:

_main in ccIMD9Hd.o

ld: symbol(s) not found
collect2: ld returned 1 exit status

What else do I need?

I managed to create an executable with the QtCreator but when installed
this has other problems. josm-tested.jar doesn't work at all, josm-latest
will use my "webkit-image" but runs anå endless loop, spitting out
in == null! messages.

Thanks for any guidance
Axel

[stoecker]

Try adding -lQtNetwork to add the required library.

[stoecker]

BTW ​http://www.dstoecker.eu/webkit-image is a macos-version without the QT libs which you need to install yourself.

[axel.roeslein@…]

Fine, one step further

g++ webkit-image.cpp -o webkit-image -lQtCore -lQtWebKit -lQtGui -lQtNetwork -O2 \
  -L/Developer/Applications/Qt/QtCreator.app/Contents/Frameworks

now compiles fine.

The dynamic libraries aren't found at runtime though.

~/work/josm > ./webkit-image "file:////Users/ar/.josm/plugins/wmsplugin/ymap.html?bbox=10.00,53.52,10.01,53.53&srs=EPSG:4326&width=500&height=500"
dyld: Library not loaded: @executable_path/../Frameworks/libQtCore.dylib
  Referenced from: /Users/ar/work/josm/./webkit-image
  Reason: image not found
Trace/BPT trap

~/work/josm > otool -L webkit-image
webkit-image:
        @executable_path/../Frameworks/libQtCore.dylib (compatibility version 4.5.0, current version 4.5.0)
        @executable_path/../Frameworks/libQtWebKit.dylib (compatibility version 4.5.0, current version 4.5.0)
        @executable_path/../Frameworks/libQtGui.dylib (compatibility version 4.5.0, current version 4.5.0)
        @executable_path/../Frameworks/libQtNetwork.dylib (compatibility version 4.5.0, current version 4.5.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.3)

I wouldn't like to setup those @executable_path/../Frameworks files.
Is there a way to statically link?

OTOH: The webkit-image build with QtCreator works and uses static libs.
I'd just prefer the building by a script which should make it easier for
others to build, debug their own.

Regards,

Axel

[stoecker]

Option -static?

[anonymous]

unfortunately not

FATAL:incompatible feature used: section type non_lazy_symbol_pointers (must specify "-dynamic" to be used)

[axel.roeslein@…]

Hello

from reading the Qt documentation I learned that I'd need to recompile Qt itself
in order to build a statically linked app.

I guess this is all overkill. webkit-image would have a full load of libraries for
a seemingly simple task.

I would like to reimplement webkit-image with Perl, Ruby, Java or even AppleScript.
The current problem is just my poor knowledge of C++ and the used libraries.

If anybody could give me functional desription I'd port it to another base.

Regards,

Axel

[stoecker]

Well, that's easy. You need to make a tool which downloads a webpage and supplies it as picture of correct size. You need a HTML rendering engine supporting complex JavaScript for this. That's why I choose webkit, as this is available on the major plattforms.

[axel.roeslein@…]

Understood.

It looks to me as if just the ObjC binding of WebKit is a viable solution.
WebKit could be assumed instaleld by default on any Mac, Qt is currently
an extra installation, right?

Java would fit better but I haven't found a good binding yet. Anybody?

[axel.roeslein@…]

I have trouble in understanding the necessary procedure.

A sample request sent out from a browser

ymap.html?bbox=...&width=500&height=500

will give me back e.g. 24 JPEG images, each 256x265 Pixel.
The included JavaScript code somehow reduces the number of displayed images.

In ~/.josm/plugins/wmsplugin/cache I find 9 images, each 400x672 Pixel

Would webkit-image just extract every JPEG from the webkit view and wmsplugins
cares for the rest? Do I need to use the JavaScript set window use?

[stoecker]

Yes, you need to output the JavaScript window. This is reduced to the dimensions of the requested geographic coordinates.