Passing structures through mex

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Justin 2012-1-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26059-passing-structures-through-mex

Ok. I have a structure I want to have access to in my mex file (which I'm writing in C). The values are located in a field within a field (fieldception). Here's an explicit example:

I want to access:

sys.gen.window_size

Where window_size contains an array with the x and y size of a picture (i.e. sys.gen.window_size = size(picture)).

I know you're supposed to use mxGetField. Matlab help says I need to write the field name when sending a structure as an argument, but since the field is a subfield, would I just enter "gen.window_size?"

Or... should I just make life easier and rewrite the structure contain no subfields?

Thanks

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采纳的回答

James Tursa 2012-1-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26059-passing-structures-through-mex#answer_34053

在 MATLAB Online 中打开

E.g., the following code snippet w/o any argument checking, assuming you pass in the structure sys as the first argument:

mxArray *gen, *window_size;
double *pr;
   :
gen = mxGetField(prhs[0],0,"gen");
window_size = mxGetField(gen,0,"window_size");
pr = mxGetPr(window_size);

pr[0] and pr[1] are your window size values.

NOTE: gen and window_size are pointers to the original fields of your workspace variable. They are not copies, so be sure that you do not call mxDestroyArray on them when you are done.