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Simulink: Find all subsystem paths from SLX

In our previous post we learned that Simulink SLX files are just ZIP-compressed XML files.

The following C++ program can be used to parse model/blockdiagram.xml from the pre-extracted ZIP file and find all subsystem paths in the model.

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <tinyxml2.h>

using namespace tinyxml2;
using namespace std;

void traverseXML(XMLElement* element, const string& parentPath, vector<string>& paths) {
    // Verarbeite das aktuelle Element
    const char* blockType = element->Attribute("BlockType");
    const char* name = element->Attribute("Name");
    
    string currentPath = parentPath;
    if (name) {
        currentPath = parentPath.empty() ? name : parentPath + "/" + name;
    }
    
    // Spezielle Behandlung für Blöcke vom Typ SubSystem
    if (blockType && string(blockType) == "SubSystem") {
        paths.push_back(currentPath);
    }
    
    // Rekursiv durch alle Kindelemente iterieren
    for (XMLElement* child = element->FirstChildElement(); 
         child; 
         child = child->NextSiblingElement()) {
        traverseXML(child, currentPath, paths);
    }
}

vector<string> getSubsystemPaths(const string& xmlFile) {
    vector<string> paths;
    XMLDocument doc;
    if (doc.LoadFile(xmlFile.c_str()) != XML_SUCCESS) {
        cerr << "Error loading XML file!" << endl;
        return paths;
    }
    
    XMLElement* root = doc.RootElement();
    if (root) {
        traverseXML(root, "", paths);
    }
    return paths;
}

int main() {
    string xmlFile = "simulink/blockdiagram.xml";  // Change this to your file path
    vector<string> subsystemPaths = getSubsystemPaths(xmlFile);
    
    for (const string& path : subsystemPaths) {
        cout << path << endl;
    }
    return 0;
}

Compile it using

g++ -o simulink_extract_subsystems simulink_extract_subsystems.cpp -ltinyxml2

It will print all subsystem paths in the model to the console.