I am facing invalid simulink object name error while executing text to char conversion

I want to perform a read operation from a text file line by line and create a constant block based out of each line name.

The created constant block to be connected to a already created display block in my simulink model, Below is the code for the same, But I am facing an error called as "invalid simulink object name"

% Open the text file

fileID = fopen('Test.txt', 'r');

model_name = 'Script_Test';

bl = find_system('Script_Test', 'Type', 'block');

position = [100 100 200 200];

% Initialize an empty cell array to store the lines

lines = {};

% Read the file line by line

while ~feof(fileID)

line = fgets(fileID); % Read one line

if ischar(line) % Check if line is a character array

lines = convertStringsToChars(line);

m = extractBefore(lines, '_');

constantBlockName = append(m);

constantBlockPosition = position;

% add_block('simulink/Sources/Constant', ['Script_Test/', constantBlockName],'position', constantBlockPosition, 'Value', num2str(0));

add_block('simulink/Sources/Constant',['Script_Test/', constantBlockName], 'position', constantBlockPosition, 'Value', num2str(0));

end

for d = 1:length(bl)

blockname = extractAfter(char(bl(d)),'Script_Test/Display_');

Constantname = extractAfter(constantBlockName,'Constant_');

if contains (blockname, Constantname) == 1

add_line('Script_Test', constantBlockName, char(bl(d)));

end

end

% Read the next line

line = fgets(fileID);

end

[Daniel]

Could you provide the full error, please?

[vignesh sainath]

Hi Daniel

Please find the error below

>> LDF_Script

Error using LDF_Script

Invalid Simulink object name: 'CrashInput'.

Answer 1

[Ramtej]

Hi,

The error you are encountering is due to the invalid outport and inport in the function "add_line".

Replace the code inside your if statement with the code below:

% Here blockNames are the exact names that you see below your blocks in
% Simulink model
% Your outport and inport should be in the format: The block name, a slash, and the port number

outport=constantBlockName + "/1"; % Since the Constant block only has one output port, the only port number you specify is 1.
inport=displayBlockName + "/1"; % Since the Display block only has one input port, the only port number you specify is 1.

add_line('Script_Test', outport, inport);

Refer to the below documention on the detailed instructions on how to use "add_line" function:

add_line: www.mathworks.com/help/simulink/slref/add_line.html

[vignesh sainath]

Hi Ramtej

I have updated my script with your updated code snippet, But I am unable to see the error resolving can you check please.

fileID = fopen('TXT_Test.txt', 'r');

model_name = 'Test_SLX';

bl = find_system('Test_SLX', 'Type', 'block');

position = [100 100 200 200];

% Initialize an empty cell array to store the lines

lines = {};

% Read the file line by line

while ~feof(fileID)

line = fgets(fileID); % Read one line

if ischar(line) % Check if line is a character array

lines = convertStringsToChars(line);

m = extractBefore(lines, '_');

constantBlockName = append(m);

constantBlockPosition = position;

% add_block('simulink/Sources/Constant', ['Test_SLX/', constantBlockName],'position', constantBlockPosition, 'Value', num2str(0));

add_block('simulink/Sources/Constant',['Test_SLX/', constantBlockName], 'position', constantBlockPosition, 'Value', num2str(0));

end

for d = 1:length(bl)

blockname = extractAfter(char(bl(d)),'Test_SLX/Display_');

Constantname = append(constantBlockName);

if contains (blockname, Constantname) == 1

outport=constantBlockName + "/1"; % Since the Constant block only has one output port, the only port number you specify is 1.

inport= blockname + "/1"; % Since the Display block only has one input port, the only port number you specify is 1.

add_line('Test_SLX', constantBlockName, blockname);

end

end

% Read the next line

line = fgets(fileID);

end