How to get the render global information in VC++?

[zrfting]

How to get the render global information in VC++?
Thanks

[joojaa]

They are stored in a few nodes inside maya. teh globals is just a unified ui for that. But if you want to access them via the api you must go to the source. Juat liek you would if you used mel.

Nodes that contain this data are

defaultRenderGlobals,defaultRenderQuality, defaultResolution for sw render (most should be connected torenderGlobalsList1)

For mentalray globals mentalrayGlobals and its history children (sepends on preset).

hardware hardwareRenderGlobals and so on

Youd better look at the mel scripts that build the render globals ui for details.

But baasicaly you read the data from theese nodes just like you would form any other node.

[zrfting]

yes,I know the render global is a node ,then I write these code ,but when compiled,there are error.
MFileIO::open(fileName);
MString renderinfo;
MGlobal::executeCommand("getAttr -asString defaultRenderGlobals.imageFormat",renderinfo);

d:AliasMaya6.0.1includemayaMTypes.h(214) : error C2632: 'char' followed by 'bool' is illegal
d:AliasMaya6.0.1includemayaMTypes.h(214) : warning C4091: 'typedef ' : ignored on left of 'unsigned char' when no variable is declared
d:AliasMaya6.0.1includemayaMTypes.h(218) : error C2143: syntax error : missing '}' before 'constant'
d:AliasMaya6.0.1includemayaMTypes.h(218) : error C2143: syntax error : missing ';' before '}'
d:AliasMaya6.0.1includemayaMTypes.h(218) : error C2059: syntax error : '}'

[joojaa]

Well the error does not seem to be on those lines at all! Tested this and it works fine.

But why do you use mel inside your c code at all? Whats the purpose of the plugin.

[zrfting]

how to evaluate the value of "MString" to "CString"?

[zrfting]

I don't create a Maya Plugin, but I need access the Maya File (etc. mb ma) infomation in my programe.
I only know getAttr command can access the Node attribute, What other way??

[joojaa]

One very easy solution is to allways use ma files thety are very easy to parse.

BUt yeah if you wish to do this in pure api manner then you need to do a LOT of extra work. Since the operations a e very lowlevell.

i mean you need tos tep tru a lot offf stuff to get what mel offers.

MObject obj,attr;
    int enumVal;
MSelectionList list;
list.add(MString("defaultRenderGlobals"));
list.getDependNode(0,obj);
    MFnDependencyNode depend(obj);
    attr=depend.attribute(MString("imageFormat"))
MPlug plug(obj,attr);
plug.getValue(enumVal);
MFnEnumAttribute enumAttr(attr);
MString result=enumAttr.fieldName(enumVal);
MGlobal:: displayInfo(result);

Tough this is nowhere near optimal it does the job. But a total different strategy is in order if you want ALL the attributes of a certain node.

PS you dont happen to make a render dispatcher now do you?

[joojaa]

For the conversion can use the MString::asChar() wich returns a standard c style string cih can be used by CString. Tough to be honest theres realy not much need for this at all.

[zrfting]

Thank you very much, you'r wonderful !!!
I solved the question.