(C++) Settings.xml Reader

[Buck1000]

I've used this function in all of my projects, to make my program settings editable from outside of the source code. It simply reads in values from an XML file, and creates an IrrlichtDevice* from them -

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IrrlichtDevice* Setup(std::string filename, CEventReceiver* receiver)
{
    IrrXMLReader* xml = createIrrXMLReader(filename.c_str());

	std::string d;

	int x,y,z,f,vs,sb,aa;

    while(xml && xml->read())
    {
        switch(xml->getNodeType())
        {
            case EXN_ELEMENT:
            {
                if (!strcmp("Screen", xml->getNodeName()))
                {
                    x = xml->getAttributeValueAsInt("X");
                    y = xml->getAttributeValueAsInt("Y");
                    z = xml->getAttributeValueAsInt("Z");
                    f = xml->getAttributeValueAsInt("F");
                }
                else
                if (!strcmp("Render", xml->getNodeName()))
                {
                    aa = xml->getAttributeValueAsInt("AA");
                    sb = xml->getAttributeValueAsInt("SB");
                    vs = xml->getAttributeValueAsInt("VS");
                    d = xml->getAttributeValue("Driver");
                }
            }
            break;
        }
    }
    delete xml;

    E_DRIVER_TYPE driver;

	if(d!="gl")
#ifdef _IRR_COMPILE_WITH_DIRECT3D_9_ 
		if(d!="dx")
#endif 
			d="so";

    if(d=="gl")
        driver=EDT_OPENGL;
    if(d=="dx")
        driver=EDT_DIRECT3D9;
	if(d=="so")
		driver=EDT_BURNINGSVIDEO;

	SIrrlichtCreationParameters params;
	params.AntiAlias=aa;
	params.Stencilbuffer=sb;
	params.Vsync=vs;
	params.WindowSize=dimension2d<s32>(x,y);
	params.Bits=z;
	params.Fullscreen=f;
	params.EventReceiver=receiver;
	params.DriverType=driver;

	IrrlichtDevice* device=createDeviceEx(params);

	return device;
}

Here is a sample Settings.xml file -

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<!-- Graphics Config -->
<Screen X="1280" Y="1024" Z="32" F="1"/>
<Render AA="1" SB="1" VS="1" Driver="gl"/>

<!--             Valid Values                          -->
<!-- Driver -> gl, dx                                  -->

It is easily expandable, and has many uses. The code can be ported to custom media importers and similar utilities.

Enjoy!

[greenya]

if you will use this code in Linux (where no Direct3D render) and will use "dx" in config, than device will fail to create.
So you can improve small part of your code next way:

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    ...

    if(d!="gl") 
#ifdef _IRR_COMPILE_WITH_DIRECT3D_9_
      if(d!="dx") 
#endif
         d="so";

    ...

It will does not recognize "dx" if Direct3D render not included and fall to "so" automatically.

[Buck1000]

Thanks I haven't actually used this before in anything other than a windows environment, so thats a useful failsafe to add.

EDIT: I edited my original post to include it.