Traverse cell array of structures of ... in mex

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Peter Cotton
Peter Cotton 2011-3-15
Does anyone have a nice .mex example where we pass in a cell array of struct, and interrogate fields in each structure?
This mex newby is baffled as to why mxIsStruct returns false when the following is passed a cell array of struct:
void blah(mxArray* X)
mxArray* pm;
mwIndex i;
i = 1;
pm = mxGetCell(X,i);
if (~mxIsStruct(pm)) {
mexErrMsgTxt("Not a structure");
}

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采纳的回答

Jan
Jan 2011-3-16
You are talking about C, not Matlab. In C the NOT operator is "!", not "~".
if (~mxIsStruct(pm)) % Bad
if (!mxIsStruct(pm)) % Good
The tilde ~ is the bitwise complement in C.

更多回答（3 个）

Jan
Jan 2011-3-16
I've published two different C-Mex function which access cells and struct fields: frmfield and cstrainbp. Perhaps they help.
Kaustubha Govind
Kaustubha Govind 2011-3-15
The example phonebook.c accepts an array of structs and returns a cell array - this should serve as a good starting point.
James Tursa
James Tursa 2011-3-16
C is 0-based indexing. You have this in your code:
i = 1;
Are you sure you have two elements in X? Or did you mean:
i = 0;

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