Octave 5.1.0中如何将urlread输出转换为struct？

Hey there! I totally get it—relying on regexp to yank data from raw strings is messy, error-prone, and just not sustainable for structured formats like JSON or XML. Luckily, Octave has built-in or easily accessible tools to replicate Matlab's webread behavior cleanly. Here's how to do it right:

For JSON Data #

Octave includes a jsondecode function (available since version 4.0, so your 5.1.0 release supports it perfectly) that converts JSON strings directly into usable Octave structures—exactly like Matlab's webread does. Here's the straightforward workflow:

# Fetch the raw JSON string from the URL
urlString = "your_json_url_here";
raw_json = urlread(urlString);

# Convert the string to a struct you can work with directly
data = jsondecode(raw_json);

Once you run this, data will be a struct with fields matching the JSON hierarchy. You can access values just like in Matlab (e.g., data.user.name or data.items(3)).

For XML Data #

XML handling takes a few extra steps, but it’s still way better than regexp. Octave uses Java under the hood for XML parsing, and you can use the Octave Forge xml package to convert XML documents to familiar structs:

Step 1: Install and load the XML package (if you haven’t already) #

pkg install -forge xml
pkg load xml

Step 2: Fetch and parse the XML into a struct #

# Grab the raw XML string from the URL
urlString = "your_xml_url_here";
raw_xml = urlread(urlString);

# Parse the string into an XML document object
xml_doc = xmlread(java.io.StringReader(raw_xml));

# Convert the document to a nested struct (using the xml package)
data_struct = xml2struct(xml_doc);

The resulting data_struct will mirror the XML’s hierarchy as nested structures, making it easy to navigate and extract values without manual string hacking.

Why This Beats Regexp #

Dedicated parsers automatically handle edge cases like escaped characters, nested structures, or minor syntax quirks that regexp would choke on. Your code will be cleaner, more maintainable, and far less likely to break if the API’s response format changes slightly.

内容的提问来源于stack exchange，提问作者Marcallus