IrrNewt wont compile.

[pontus.johansson]

hey there.
Ive been looking through options for collision detection in my game.
I wanted something pretty high-level, so that narrowed me down to a wrapper.
then i looked through a couple of wrappers and saw that only IrrNewt had joints. so i choosed that.
i got the last version from svn and tried to compile the hello world project with visual studio 2005 express.
and got a couple of warnings and errors

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------ Build started: Project: hello world, Configuration: Debug Win32 ------
Compiling...
hello world.cpp
f:\c++\irrnewt\include\hidden.hpp(194) : warning C4244: 'argument' : conversion from 'irr::f64' to 'irr::f32', possible loss of data
f:\c++\irrnewt\include\hidden.hpp(194) : warning C4244: 'argument' : conversion from 'irr::f64' to 'irr::f32', possible loss of data
f:\c++\irrnewt\include\hidden.hpp(194) : warning C4244: 'argument' : conversion from 'irr::f64' to 'irr::f32', possible loss of data
f:\c++\irrnewt\include\utils.hpp(93) : warning C4244: 'argument' : conversion from 'irr::s32' to 'irr::f32', possible loss of data
f:\c++\irrnewt\include\utils.hpp(93) : warning C4244: 'argument' : conversion from 'irr::s32' to 'irr::f32', possible loss of data
f:\c++\irrnewt\include\utils.hpp(93) : warning C4244: 'argument' : conversion from 'irr::s32' to 'irr::f32', possible loss of data
f:\c++\irrnewt\include\utils.hpp(195) : error C2668: 'pow' : ambiguous call to overloaded function
        e:\program files\microsoft visual studio 8\vc\include\math.h(575): could be 'long double pow(long double,int)'
        e:\program files\microsoft visual studio 8\vc\include\math.h(573): or 'long double pow(long double,long double)'
        e:\program files\microsoft visual studio 8\vc\include\math.h(527): or 'float pow(float,int)'
        e:\program files\microsoft visual studio 8\vc\include\math.h(525): or 'float pow(float,float)'
        e:\program files\microsoft visual studio 8\vc\include\math.h(489): or 'double pow(double,int)'
        e:\program files\microsoft visual studio 8\vc\include\math.h(123): or 'double pow(double,double)'
        while trying to match the argument list '(int, irr::u32)'
f:\c++\irrnewt\include\world.hpp(284) : warning C4244: '=' : conversion from 'irr::u32' to 'irr::f32', possible loss of data
f:\c++\irrnewt\examples\hello world\hello world.cpp(58) : error C2259: 'MyeventReceiver' : cannot instantiate abstract class
        due to following members:
        'bool irr::IEventReceiver::OnEvent(const irr::SEvent &)' : is abstract
        f:\c++\irrlicht-1.4.1\include\ieventreceiver.h(262) : see declaration of 'irr::IEventReceiver::OnEvent'
Build log was saved at "file://f:\c++\IrrNewt\examples\IDE\visual studio\Debug\BuildLog.htm"
hello world - 2 error(s), 7 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

if anyone could help me i would be glad.

[hybrid]

The OnEvent thing is explained in the FAQ a little above this post. The ambiguous overload is propably a lack of proper casting (pow usually expects a double, use powf for floats, and let integers become one of the two first). And the warnings are just warnings, but might introduce trouble or slowdown if they shouldn't be integers at some point...

[pontus.johansson]

i dont get it, it looks like the event thingie is as it should be.
maby i should just give up and use something else

[hybrid]

Well, compare this line

'bool irr::IEventReceiver::OnEvent(const irr::SEvent &)' : is abstract

with the OnEvent in your code. You should see the difference in the parameter (it needs to be const in Irrlicht 1.4 and later, before it was copied).

[baiqian]

Besides above two errors, when i compile, I got another error

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error C2039: "Textures": is not a member of "irr::video::SMaterial" 

I use VS2008 team suite+ Irrlicht 1.4.2 + Newton 1.53

[aungsithu]

for pow function, update to something like

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irr::f32 save=(irr::f32)pow((double)10,(double)decimal);

for event, update like

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virtual bool OnEvent(const SEvent& event)

for textures error, update like

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material.TextureLayer[0].Texture

[baiqian]

Thanks! Compiling the Lib done! But when I use this LIB to compile the irrnewt example "Demo",
I revise the Demo's OnEvent() as below

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class MyEventReceiver:public IEventReceiver {
public:
	virtual bool OnEvent(const SEvent &event) {

But it shows error

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Error	17	error LNK2001: unresolved external symbol "__declspec(dllimport) class irr::IrrlichtDevice * __cdecl irr::createDeviceEx(struct irr::SIrrlichtCreationParameters const &)" (__imp_?createDeviceEx@irr@@YAPAVIrrlichtDevice@1@ABUSIrrlichtCreationParameters@1@@Z)	demo.obj	Demo

33 unresolved external symbol

Total 33 errors for compling with"unresolved external symbol", I doubt whether my complied LIB has any problems due to OnEvent() ? However, all OnEvent() has been updated, including irrnewt source and example , but seems still can not run.....

[baiqian]

Problem solved by myself , thanks~!

[xtayxkjy]

[/Problem solved by myself , thanks~!]

I have the same trouble.Can you tell me how to solve the problem? Thank you

[zillion42]

me too !
solved... by following instructions in this thread....