codegen: Problems using a structure as an input parmeter

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AJ
AJ 2012-2-2
编辑： dpb 2013-10-1
I am developing a codegen project with multiple functions. One function BAR1 returns a structure of type FOO. Another function BAR2 accepts a structure of type FOO. However, the code generator creates two structures, indentical except they have different structure names. The code, as generated, produces a syntax error in my app:
FOO_TYPE foo;
double c;
foo = bar1();
c = bar2(foo);
error C2664: 'bar2' : cannot convert parameter 1 from 'FOO_TYPE' to 'const struct_T'
How can I make bar2() accept a struct of type 'FOO_TYPE' instead of internally generated type 'struct_T'?
A workaround is to use:
c = bar2(*(struct_T*)&foo);
but this is not robust if the structure name is redefined by codegen.
Thanks, AJ
Here is the Matlab code. In the codegen project, for bar2, I specified the input type "by example" using "FOO_TYPE". ====================
function foo = bar1
%bar1 - Code generator test case - Structure as an output
%#codegen
foo = FOO_TYPE;
foo.a = 1.0;
foo.b = 2.0;
====================
function c = bar2(foo)
%bar2 - Code generator test case - Structure as an input
%#codegen
c = double(0);
c = sqrt(foo.a^2 + foo.b^2);
====================
function s = FOO_TYPE
%FOO_TYPE - Defines a structure
%#codegen
s = struct(...
'a', double(0), ...
'b', double(0));
coder.cstructname(s, 'FOO_TYPE');

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采纳的回答

Fred Smith
Fred Smith 2012-2-16
Hi AJ,
Have you looked at coder.cstructname? That command can be used to specify the C name to use for a structure type.
-Fred

更多回答（1 个）

Fred Smith
Fred Smith 2012-2-3
Have you tried compiling both of these files with a single call to the codegen command? You can pass multiple entry points, and MATLAB Coder should ensure that the types are resolved correctly.
  1 个评论
AJ
AJ 2012-2-6
Thanks for the reply.
I did build this project with a single codegen call with multiple entry points.
For defining input types, there seems to be no concept of "named structures". Structures are defined by only their fields. I was hoping there would be some codegen directive and/or method to assign names to input structures. I am not intimately familiar with coder, and have been replying on the user interfaces for project building.
AJ

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