Function works fine in MATLAB, however, when I get to MATLAB coder, it fails with error does not terminate due to an infinite loop

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Alexander Dumont
Alexander Dumont 2023-12-5
评论： Alexander Dumont 2023-12-6
Hi all
I've got a function I've made in MATLAB, attached to this passage.
function [undistortedImage] = imwarpingImageFromFilenamesCoder(ImageFile,movingPoints,fixedPoints) %#codegen
fid = fopen(movingPoints);
tline = fgetl(fid);
c = 2;
while(ischar(tline))
tline = fgetl(fid);
c = c + 1;
end
fclose(fid);
mP = zeros(c-2,2);
fid = fopen(movingPoints);
s = fgetl(fid);
d = {','};
l = {};
while (length(s) > 0)
[t,s] = strtok(s,d);
l = {l{:}, t};
l = string(l);
end
l = double(l);
mP(1,:) = l;
c = 2;
while(ischar(s))
s = fgetl(fid);
l = {};
while (length(s) > 0)
[t,s] = strtok(s,d);
l = {l{:}, t};
l = string(l);
end
mP(c,:) = double((l));
c = c + 1;
end
movingPoints = mP(1:end-1,:);
mP = zeros(c-2,2);
fid = fopen(fixedPoints);
s = fgetl(fid);
d = {','};
l = {};
while (length(s) > 0)
[t,s] = strtok(s,d);
l = {l{:}, t};
l = string(l);
end
l = double(l);
mP(1,:) = l;
c = 2;
while(ischar(s))
s = fgetl(fid);
l = {};
while (length(s) > 0)
[t,s] = strtok(s,d);
l = {l{:}, t};
l = string(l);
end
mP(c,:) = double((l));
c = c + 1;
end
fixedPoints = mP(1:end-1,:);
I = imread(ImageFile);
tform = fitgeotform2d(movingPoints,fixedPoints,"projective");
undistortedImage = imwarp(I,tform);
fclose(fid);
end
This function runs fine on MATLAB (sorry for how messy it is, I've been changing functions that don't work in coder with one's that do, such as readmatrix with fgetl, etc...). Now, though, it seems too run in coder (kind of) I get the source code in c, but I get an error that says this fx does not terminate due to an infinite loop. I went to the main c file, and there is indeed this line
while (1) {
fgetl(fid, c_fid);
}
Which is an infinite loop, but I don't have any idea how the MATLAB code produces this line in C, and my C skill is not the strongest, so I'm struggling to figure out how I can fix it in C.

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采纳的回答

Steven Lord
Steven Lord 2023-12-5
Rather than checking if s is a char vector or has positive length, if you want to stop when the file has been read in I'd use feof instead. Or since you calculate how many lines the file has (the c variable) use that in a for loop instead of using while.

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