question: Use of integrated external C/C++ code in matlab coder does not work for coder.varsize?
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When I follow this topic "Call Custom C/C++ Code from the Generated Code" to generate my own external/legacy C++ code, coder.varsize('myvar') does not work. How do I declare 'myvar' to be a variable-length character vector or a variable-length scalar string?
function out = useImageAndString(imagePathList,image1)%#codegen
% generated C++ code, mainly to see the values passed for the input and output parameters
%
% reference:
% [1] coder.ceval
% [2] coder.opaque
arguments
imagePathList (1,1) string = "input.txt"
image1 (100,200) uint8 = zeros(100,200,'uint8')
end
if ~coder.target("MATLAB")
out = zeros(size(image1),"uint8");
% include external C++ functions
coder.cinclude('test1.h');
coder.updateBuildInfo('addSourceFiles', 'test1.cpp');
imgPath = char(imagePathList);% must convert to char???, can't pass string scalar to coder.rref, this is bug!
imgPath = 'input.txt'; % or i directly specify imgPath, also not work.
coder.varsize('imgPath'); % bug
coder.ceval('getImageNames',coder.rref(imgPath));
% call C++ function
coder.ceval('getImage', coder.rref(image1),coder.wref(out));
end
end
my test1.h like this:
void getImageNames(const char* imgList);
void getImage(const unsigned char inImage[20000],unsigned char outImage[20000]);
The input parameter `imgList` to the getImageNames function is a variable-length character vector or a variable-length scalar string. I tried coder.varsize to declare it, but the generated C++ code still fixes the length size with my example, how can I fix it?
codegen -config:mex useImageAndString -args {"111.txt",ones(100,200,"uint8")} -launchreport -lang:c++
For example, the example command above generates C++ code that fixes imagePathList argument the length to 7
run in R2022b
1 个评论
xingxingcui
2023-2-17
编辑：xingxingcui
2023-2-17
I understand that the R2022b is starting to support scalar string variable length input, for example the following solution could be a temporary solution to my problem.
s = "input.txt";
t = coder.typeof(s);
t.StringLength = 255;
t.VariableStringLength = true;
then,
codegen myFunction -args {t}
reference:
--------
when i use a string scalar pass coder.ref or coder.rref directly(ie. not use coder.varsize)，it report error:
run in R2022b
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