Obtain variable name in TLC

Question

Alexander Sinn 2022-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/1765700-obtain-variable-name-in-tlc

评论： Alexander Sinn 2022-7-25

I am creating a TLC file for my S-Function and I would like to produce c-code to determine the size of my vector-output-signal array via the sizeof function.

However, both LibBlockInputSignalAddr(0, "", "", 0) and LibBlockInputSignal(0, "", "", 0) only return a reference to the first element of the output signal, thus, sizeof will only return the size of one element of the corrsponding array:

sizeof testModel_Y.Outport[0]

Instead I would like to achieve:

sizeof testModel_Y.Outport

Is it possible generate this statement using a TLC file?

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Answer 1

Andy Bartlett 2022-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/1765700-obtain-variable-name-in-tlc#answer_1013025

Consider doing it in two parts

bytes = LibBlockInputSignalWidth(0) * sizeof( LibBlockInputSignal(0, "", "", 0) )

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Alexander Sinn 2022-7-25

Thank you for the answer.This is the workaround I am currently using.

I was hoping to eliminate the multiplication but this seems not to be possible.

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Answer 2

Walter Roberson 2022-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/1765700-obtain-variable-name-in-tlc#answer_1014255

在 MATLAB Online 中打开

In C,

sizeof testModel_Y.Outport

is the size of the pointer contained in testModel_Y.Outport . Multiplying the size of one element by the number of elements is the standard way to measure size of an array in C.

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Alexander Sinn 2022-7-25

According to https://docs.microsoft.com/en-us/cpp/c-language/sizeof-operator-c?view=msvc-170 above code would return the size of the array instead of the pointer: When you apply the sizeof operator to an array identifier, the result is the size of the entire array rather than the size of the pointer represented by the array identifier.

This is also in accord with my testing of this operator.

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