diff --git a/androscalpel/src/annotation.rs b/androscalpel/src/annotation.rs
index 5fc273c..4e2bf82 100644
--- a/androscalpel/src/annotation.rs
+++ b/androscalpel/src/annotation.rs
@@ -1,7 +1,7 @@
 //! Annotations (for class, fields, methods and parameters alike).
+use std::collections::{HashMap, HashSet};
 
 use pyo3::prelude::*;
-use std::collections::HashMap;
 
 use crate::{dex_id::IdType, value::DexValue, DexString};
 
@@ -61,6 +61,11 @@ impl DexAnnotationItem {
         let annotation = self.annotation.__repr__();
         format!("AnnotationItem(visibility: {visibility}, {annotation})")
     }
+
+    /// Return all strings references in the annotation.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.annotation.get_all_strings()
+    }
 }
 
 /// An annotation.
@@ -97,4 +102,15 @@ impl DexAnnotation {
         elts += "}";
         format!("Annotation({type_}, {elts})")
     }
+
+    /// Return all strings references in the annotation.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        strings.extend(self.type_.get_all_strings());
+        for (name, value) in &self.elements {
+            strings.insert(name.clone());
+            strings.extend(value.get_all_strings());
+        }
+        strings
+    }
 }
diff --git a/androscalpel/src/class.rs b/androscalpel/src/class.rs
index 0fc2049..07ae4fa 100644
--- a/androscalpel/src/class.rs
+++ b/androscalpel/src/class.rs
@@ -1,6 +1,6 @@
 //! Representation of a class.
 
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 
 use pyo3::prelude::*;
 
@@ -48,7 +48,6 @@ pub struct Class {
     #[pyo3(get, set)]
     pub source_file: Option<DexString>,
 
-    // TODO: hash map?
     /// The static fields
     #[pyo3(get, set)]
     pub static_fields: HashMap<IdField, Field>,
@@ -68,7 +67,6 @@ pub struct Class {
     /// structutres)
     #[pyo3(get, set)]
     pub annotations: Vec<DexAnnotationItem>,
-    // TODO: mix annotation data to fields / methods / class to make it more practicle
 }
 
 #[pymethods]
@@ -127,4 +125,28 @@ impl Class {
         let name: String = (&self.descriptor.get_name()).into();
         format!("Class({name})")
     }
+
+    /// Return all strings references in the class.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        strings.extend(self.descriptor.get_all_strings());
+        if let Some(ty) = &self.superclass {
+            strings.extend(ty.get_all_strings());
+        }
+        for ty in &self.interfaces {
+            strings.extend(ty.get_all_strings());
+        }
+        if let Some(string) = &self.source_file {
+            strings.insert(string.clone());
+        }
+        for (id, field) in &self.static_fields {
+            strings.extend(id.get_all_strings());
+            strings.extend(field.get_all_strings());
+        }
+        //pub instance_fields: HashMap<IdField, Field>,
+        //pub direct_methods: HashMap<IdMethod, Method>,
+        //pub virtual_methods: HashMap<IdMethod, Method>,
+        //pub annotations: Vec<DexAnnotationItem>,
+        strings
+    }
 }
diff --git a/androscalpel/src/dex_id.rs b/androscalpel/src/dex_id.rs
index 60b1bf1..dd7bf8e 100644
--- a/androscalpel/src/dex_id.rs
+++ b/androscalpel/src/dex_id.rs
@@ -1,6 +1,7 @@
 //! The class identifying dex structure.
 
 use std::collections::hash_map::DefaultHasher;
+use std::collections::HashSet;
 use std::hash::{Hash, Hasher};
 
 use anyhow::anyhow;
@@ -82,6 +83,17 @@ impl IdMethodType {
         }
         shorty.into()
     }
+
+    /// Return all strings references in the Id.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        strings.insert(self.shorty.clone());
+        strings.extend(self.return_type.get_all_strings());
+        for ty in &self.parameters {
+            strings.extend(ty.get_all_strings());
+        }
+        strings
+    }
 }
 
 /// A type.
@@ -337,6 +349,13 @@ impl IdType {
         self == other
     }
 
+    /// Return all strings references in the Id.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        strings.insert(self.0.clone());
+        strings
+    }
+
     // TODO: TESTS
 }
 
@@ -394,6 +413,15 @@ impl IdField {
         self.hash(&mut hasher);
         hasher.finish()
     }
+
+    /// Return all strings references in the Id.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        strings.insert(self.name.clone());
+        strings.extend(self.type_.get_all_strings());
+        strings.extend(self.class_.get_all_strings());
+        strings
+    }
 }
 
 /// The Id of a method.
@@ -454,6 +482,15 @@ impl IdMethod {
         self.hash(&mut hasher);
         hasher.finish()
     }
+
+    /// Return all strings references in the Id.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        strings.insert(self.name.clone());
+        strings.extend(self.proto.get_all_strings());
+        strings.extend(self.class_.get_all_strings());
+        strings
+    }
 }
 
 #[pyclass]
@@ -477,4 +514,9 @@ impl IdEnum {
     pub fn __repr__(&self) -> String {
         format!("DexEnum({})", self.__str__())
     }
+
+    /// Return all strings references in the Id.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
diff --git a/androscalpel/src/dex_string.rs b/androscalpel/src/dex_string.rs
index 28e8bb2..df0f720 100644
--- a/androscalpel/src/dex_string.rs
+++ b/androscalpel/src/dex_string.rs
@@ -1,4 +1,6 @@
+use std::cmp::{Ord, Ordering, PartialOrd};
 use std::collections::hash_map::DefaultHasher;
+use std::collections::HashSet;
 use std::hash::{Hash, Hasher};
 
 use pyo3::class::basic::CompareOp;
@@ -9,6 +11,24 @@ use pyo3::prelude::*;
 #[derive(Clone, PartialEq, Eq, Debug)]
 pub struct DexString(pub androscalpel_serializer::StringDataItem);
 
+impl Ord for DexString {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.0
+            .data
+            .cmp(&other.0.data)
+            .then(self.0.utf16_size.0.cmp(&other.0.utf16_size.0))
+    }
+}
+
+impl PartialOrd for DexString {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        self.0
+            .data
+            .partial_cmp(&other.0.data)
+            .map(|ord| ord.then(self.0.utf16_size.0.cmp(&other.0.utf16_size.0)))
+    }
+}
+
 impl From<DexString> for androscalpel_serializer::StringDataItem {
     fn from(DexString(string): DexString) -> Self {
         string
@@ -107,4 +127,11 @@ impl DexString {
         self.hash(&mut hasher);
         hasher.finish()
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        strings.insert(self.clone());
+        strings
+    }
 }
diff --git a/androscalpel/src/dex_writer.rs b/androscalpel/src/dex_writer.rs
new file mode 100644
index 0000000..69ec526
--- /dev/null
+++ b/androscalpel/src/dex_writer.rs
@@ -0,0 +1,402 @@
+//! The structure that generate a .dex from classes.
+
+use std::collections::HashMap;
+use std::io::{Cursor, Write};
+
+use crate::Result;
+use crate::*;
+use androscalpel_serializer::*;
+
+#[derive(Debug, Clone)]
+pub struct DexWriter {
+    header: HeaderItem,
+    strings: HashMap<DexString, usize>,
+    _types_ids: HashMap<IdType, usize>,
+    _proto_ids: HashMap<IdMethodType, usize>,
+    _field_ids: HashMap<IdField, usize>,
+    _method_ids: HashMap<IdMethod, usize>,
+    // TODO: composite classes need a struct for storing link data
+    // class_defs: HashMap<IdMethod, (Class, u32)>,
+    // call_site_ids: // TODO: parsing code insns
+    // method_handles:
+    // TODO: other structs in data:
+    // **map_list**, prbl generate on write
+    // values
+    // annotations
+    //
+}
+
+impl Default for DexWriter {
+    fn default() -> Self {
+        Self {
+            header: HeaderItem {
+                magic: DexFileMagic {
+                    version: [0x30, 0x33, 0x39],
+                }, // TODO: find a better default version
+                checksum: 0,
+                signature: [0u8; 20],
+                file_size: 0,
+                header_size: 0x70,
+                endian_tag: EndianConstant::EndianConstant,
+                link_size: 0,
+                link_off: 0,
+                map_off: 0,
+                string_ids_size: 0,
+                string_ids_off: 0,
+                type_ids_size: 0, // At most 0xffff
+                type_ids_off: 0,
+                proto_ids_size: 0, // At most 0xffff
+                proto_ids_off: 0,
+                field_ids_size: 0,
+                field_ids_off: 0,
+                method_ids_size: 0,
+                method_ids_off: 0,
+                class_defs_size: 0,
+                class_defs_off: 0,
+                data_size: 0, // Must be an even multiple of sizeof(uint) -> % 8 = 0
+                data_off: 0,
+            },
+            strings: HashMap::new(),
+            _types_ids: HashMap::new(),
+            _proto_ids: HashMap::new(),
+            _field_ids: HashMap::new(),
+            _method_ids: HashMap::new(),
+        }
+    }
+}
+
+impl DexWriter {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn add_class(&mut self, class: &Class) -> Result<()> {
+        // TODO: check size max
+        for string in class.get_all_strings() {
+            self.strings.insert(string, 0);
+        }
+        Ok(())
+    }
+
+    pub fn gen_dex_file_to_vec(&mut self) -> Result<Vec<u8>> {
+        let mut output = Cursor::new(Vec::<u8>::new());
+        self.write_dex_file(&mut output)?;
+        Ok(output.into_inner())
+    }
+
+    fn write_dex_file(&mut self, writer: &mut dyn Write) -> Result<()> {
+        let mut section_manager = SectionManager::default();
+        section_manager.incr_section_size(Section::HeaderItem, 0x70);
+        // TODO:
+        // map_list:
+        // - [x] header_item
+        // - [x] string_id_item
+        // - [ ] type_id_item
+        // - [ ] proto_id_item
+        // - [ ] field_id_item
+        // - [ ] method_id_item
+        // - [ ] class_def_item
+        // - [ ] call_site_id_item
+        // - [ ] method_handle_item
+        // - [ ] map_list
+        // - [ ] type_list
+        // - [ ] annotation_set_ref_list
+        // - [ ] annotation_set_item
+        // - [ ] class_data_item
+        // - [ ] code_item
+        // - [ ] string_data_item
+        // - [ ] debug_info_item
+        // - [ ] annotation_item
+        // - [ ] encoded_array_item
+        // - [ ] annotations_directory_item
+        // - [ ] hiddenapi_class_data_item
+        // Use section_manager for seting the right size/offset afterward
+
+        let mut string_ids_list: Vec<DexString> = self.strings.keys().cloned().collect();
+        string_ids_list.sort();
+        for (idx, string) in string_ids_list.iter().enumerate() {
+            self.strings
+                .entry(string.clone())
+                .and_modify(|val| *val = idx);
+            section_manager.add_elt(Section::StringIdItem, None);
+            section_manager.add_elt(Section::StringDataItem, Some(string.0.size()));
+        }
+
+        // Populate map_list
+        let map_item_size = MapItem {
+            type_: MapItemType::HeaderItem,
+            unused: 0,
+            size: 0,
+            offset: 0,
+        }
+        .size();
+        // Empty map has a size 4, then we add the size of a MapItem for each element
+        section_manager.add_elt(Section::MapList, Some(4));
+        for section in Section::VARIANT_LIST {
+            if !section.is_data() && section_manager.get_nb_elt(*section) != 0 {
+                section_manager.incr_section_size(Section::MapList, map_item_size);
+            }
+        }
+        let mut map_list = MapList::default();
+        for section in Section::VARIANT_LIST {
+            if !section.is_data() && section_manager.get_nb_elt(*section) != 0 {
+                map_list.list.push(MapItem {
+                    type_: section.get_map_item_type(),
+                    unused: 0,
+                    size: section_manager.get_nb_elt(*section) as u32,
+                    offset: section_manager.get_offset(*section),
+                });
+            }
+        }
+
+        // Link Header section:
+        self.header.map_off = section_manager.get_offset(Section::MapList);
+        self.header.string_ids_size = string_ids_list.len() as u32;
+        self.header.string_ids_off = section_manager.get_offset(Section::StringIdItem);
+        self.header.type_ids_size = 0; // TODO
+        self.header.type_ids_off = section_manager.get_offset(Section::TypeIdItem);
+        self.header.proto_ids_size = 0; // TODO
+        self.header.proto_ids_off = section_manager.get_offset(Section::ProtoIdItem);
+        self.header.field_ids_size = 0; // TODO
+        self.header.field_ids_off = section_manager.get_offset(Section::FieldIdItem);
+        self.header.method_ids_size = 0; // TODO
+        self.header.method_ids_off = section_manager.get_offset(Section::MethodIdItem);
+        self.header.class_defs_size = 0; // TODO
+        self.header.class_defs_off = section_manager.get_offset(Section::ClassDefItem);
+        self.header.data_size = section_manager.get_size(Section::Data);
+        self.header.data_off = section_manager.get_offset(Section::Data);
+
+        // TODO: compute checksum, hash, ect
+        self.header.serialize(writer)?;
+        // StringIdItem section
+        let mut string_off = section_manager.get_offset(Section::StringDataItem);
+        for string in string_ids_list {
+            let str_id = StringIdItem {
+                string_data_off: string_off,
+            };
+            str_id.serialize(writer)?;
+            string_off += string.0.size() as u32;
+        }
+        // TODO: TypeIdItem
+        // TODO: ProtoIdItem,
+        // TODO: FieldIdItem,
+        // TODO: MethodIdItem,
+        // TODO: ClassDefItem,
+        // TODO: CallSiteIdItem,
+        // TODO: MethodHandleItem,
+        // TODO: Data,
+        // MapList,
+        map_list.serialize(writer)?;
+        // TODO: TypeList,
+        // TODO: AnnotationSetRefList,
+        // TODO: AnnotationSetItem,
+        // TODO: ClassDataItem,
+        // TODO: CodeItem,
+        // TODO: StringDataItem,
+
+        // TODO
+
+        // TODO: DebugInfoItem,
+        // TODO: AnnotationItem,
+        // TODO: EncodedArrayItem,
+        // TODO: AnnotationsDirectoryItem,
+        // TODO: HiddenapiClassDataItem,
+        Ok(())
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum Section {
+    HeaderItem,
+    StringIdItem,
+    TypeIdItem,
+    ProtoIdItem,
+    FieldIdItem,
+    MethodIdItem,
+    ClassDefItem,
+    CallSiteIdItem,
+    MethodHandleItem,
+    Data,
+    MapList,
+    TypeList,
+    AnnotationSetRefList,
+    AnnotationSetItem,
+    ClassDataItem,
+    CodeItem,
+    StringDataItem,
+    DebugInfoItem,
+    AnnotationItem,
+    EncodedArrayItem,
+    AnnotationsDirectoryItem,
+    HiddenapiClassDataItem,
+}
+
+impl Section {
+    const VARIANT_LIST: &[Self] = &[
+        Self::HeaderItem,
+        Self::StringIdItem,
+        Self::TypeIdItem,
+        Self::ProtoIdItem,
+        Self::FieldIdItem,
+        Self::MethodIdItem,
+        Self::ClassDefItem,
+        Self::CallSiteIdItem,
+        Self::MethodHandleItem,
+        Self::Data,
+        Self::MapList,
+        Self::TypeList,
+        Self::AnnotationSetRefList,
+        Self::AnnotationSetItem,
+        Self::ClassDataItem,
+        Self::CodeItem,
+        Self::StringDataItem,
+        Self::DebugInfoItem,
+        Self::AnnotationItem,
+        Self::EncodedArrayItem,
+        Self::AnnotationsDirectoryItem,
+        Self::HiddenapiClassDataItem,
+    ];
+
+    fn get_index(&self) -> usize {
+        match self {
+            Self::HeaderItem => 0,
+            Self::StringIdItem => 1,
+            Self::TypeIdItem => 2,
+            Self::ProtoIdItem => 3,
+            Self::FieldIdItem => 4,
+            Self::MethodIdItem => 5,
+            Self::ClassDefItem => 6,
+            Self::CallSiteIdItem => 7,
+            Self::MethodHandleItem => 8,
+            Self::Data => 9,
+            Self::MapList => 10,
+            Self::TypeList => 11,
+            Self::AnnotationSetRefList => 12,
+            Self::AnnotationSetItem => 13,
+            Self::ClassDataItem => 14,
+            Self::CodeItem => 15,
+            Self::StringDataItem => 16,
+            Self::DebugInfoItem => 17,
+            Self::AnnotationItem => 18,
+            Self::EncodedArrayItem => 19,
+            Self::AnnotationsDirectoryItem => 20,
+            Self::HiddenapiClassDataItem => 21,
+        }
+    }
+
+    fn get_elt_size(&self, default_size: Option<usize>) -> usize {
+        let fixed_size = match self {
+            Self::HeaderItem => Some(0x70),
+            Self::StringIdItem => Some(4),
+            Self::TypeIdItem => Some(4),
+            Self::ProtoIdItem => Some(0xc),
+            Self::FieldIdItem => Some(8),
+            Self::MethodIdItem => Some(8),
+            Self::ClassDefItem => Some(0x20),
+            Self::CallSiteIdItem => Some(4),
+            Self::MethodHandleItem => Some(8),
+            Self::Data => panic!("Element cannot be inserted in data dirctly"),
+            Self::MapList => None,
+            Self::TypeList => None,
+            Self::AnnotationSetRefList => None,
+            Self::AnnotationSetItem => None,
+            Self::ClassDataItem => None,
+            Self::CodeItem => None,
+            Self::StringDataItem => None,
+            Self::DebugInfoItem => None,
+            Self::AnnotationItem => None,
+            Self::EncodedArrayItem => None,
+            Self::AnnotationsDirectoryItem => None,
+            Self::HiddenapiClassDataItem => None,
+        };
+        if let (Some(fixed_size), Some(default_size)) = (fixed_size, default_size) {
+            if fixed_size == default_size {
+                default_size
+            } else {
+                panic!(
+                    "Element in {:?} have a size of {}, not {}",
+                    self, fixed_size, default_size
+                )
+            }
+        } else {
+            fixed_size.or(default_size).expect(&format!(
+                "Element of {:?} don't have a fixed size, you need to provide one",
+                self
+            ))
+        }
+    }
+
+    fn get_map_item_type(&self) -> MapItemType {
+        match self {
+            Self::HeaderItem => MapItemType::HeaderItem,
+            Self::StringIdItem => MapItemType::StringIdItem,
+            Self::TypeIdItem => MapItemType::TypeIdItem,
+            Self::ProtoIdItem => MapItemType::ProtoIdItem,
+            Self::FieldIdItem => MapItemType::FieldIdItem,
+            Self::MethodIdItem => MapItemType::MethodIdItem,
+            Self::ClassDefItem => MapItemType::ClassDefItem,
+            Self::CallSiteIdItem => MapItemType::CallSiteIdItem,
+            Self::MethodHandleItem => MapItemType::MethodHandleItem,
+            Self::Data => panic!("Data is not a MatItemType"),
+            Self::MapList => MapItemType::MapList,
+            Self::TypeList => MapItemType::TypeList,
+            Self::AnnotationSetRefList => MapItemType::AnnotationSetRefList,
+            Self::AnnotationSetItem => MapItemType::AnnotationSetItem,
+            Self::ClassDataItem => MapItemType::ClassDataItem,
+            Self::CodeItem => MapItemType::CodeItem,
+            Self::StringDataItem => MapItemType::StringDataItem,
+            Self::DebugInfoItem => MapItemType::DebugInfoItem,
+            Self::AnnotationItem => MapItemType::AnnotationItem,
+            Self::EncodedArrayItem => MapItemType::EncodedArrayItem,
+            Self::AnnotationsDirectoryItem => MapItemType::AnnotationsDirectoryItem,
+            Self::HiddenapiClassDataItem => MapItemType::HiddenapiClassDataItem,
+        }
+    }
+
+    fn is_data(&self) -> bool {
+        match self {
+            Self::Data => true,
+            _ => false,
+        }
+    }
+}
+
+#[derive(Debug, Default)]
+struct SectionManager {
+    sizes: [u32; Self::NB_SECTION],
+    nb_elt: [usize; Self::NB_SECTION],
+}
+
+impl SectionManager {
+    const NB_SECTION: usize = 22;
+
+    fn add_elt(&mut self, section: Section, size: Option<usize>) {
+        if section.is_data() {
+            panic!("Cannot add element directly in section data");
+        }
+        self.sizes[section.get_index()] += section.get_elt_size(size) as u32;
+        self.nb_elt[section.get_index()] += 1;
+    }
+
+    fn incr_section_size(&mut self, section: Section, size: usize) {
+        self.sizes[section.get_index()] += size as u32;
+    }
+
+    fn get_offset(&self, section: Section) -> u32 {
+        // TODO: check alignment
+        self.sizes[..section.get_index()].iter().sum()
+    }
+
+    fn get_size(&self, section: Section) -> u32 {
+        // TODO: check alignment
+        if section.is_data() {
+            self.sizes[section.get_index()..].iter().sum()
+        } else {
+            self.sizes[section.get_index()]
+        }
+    }
+
+    fn get_nb_elt(&self, section: Section) -> usize {
+        self.nb_elt[section.get_index()]
+    }
+}
diff --git a/androscalpel/src/field.rs b/androscalpel/src/field.rs
index 5781138..3098a09 100644
--- a/androscalpel/src/field.rs
+++ b/androscalpel/src/field.rs
@@ -1,8 +1,10 @@
 //! Representation of the fields of a class.
 
+use std::collections::HashSet;
+
 use pyo3::prelude::*;
 
-use crate::{DexAnnotationItem, DexValue, IdField};
+use crate::{DexAnnotationItem, DexString, DexValue, IdField};
 
 /// Represent a field.
 #[pyclass]
@@ -116,4 +118,18 @@ impl Field {
         // TODO: check type match
         Ok(())
     }
+
+    /// Return all strings references in the field.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+
+        strings.extend(self.descriptor.get_all_strings());
+        if let Some(val) = &self.value {
+            strings.extend(val.get_all_strings());
+        }
+        for annot in &self.annotations {
+            strings.extend(annot.get_all_strings());
+        }
+        strings
+    }
 }
diff --git a/androscalpel/src/method_handle.rs b/androscalpel/src/method_handle.rs
index cfc3a2c..ef86100 100644
--- a/androscalpel/src/method_handle.rs
+++ b/androscalpel/src/method_handle.rs
@@ -1,9 +1,12 @@
 //! The structure use to reference a method invocation.
 
+use std::collections::HashSet;
+
 use pyo3::exceptions::PyTypeError;
 use pyo3::prelude::*;
 
 use crate::dex_id::*;
+use crate::DexString;
 
 /// The structure use to reference a method invocation.
 #[derive(Debug, Clone)]
@@ -41,6 +44,11 @@ impl StaticPut {
     pub fn __repr__(&self) -> String {
         format!("StaticPut({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 #[pyclass]
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -64,6 +72,11 @@ impl StaticGet {
     pub fn __repr__(&self) -> String {
         format!("StaticGet({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 #[pyclass]
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -87,6 +100,11 @@ impl InstancePut {
     pub fn __repr__(&self) -> String {
         format!("InstancePut({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 #[pyclass]
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -110,6 +128,11 @@ impl InstanceGet {
     pub fn __repr__(&self) -> String {
         format!("InstanceGet({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 
 #[pyclass]
@@ -134,6 +157,11 @@ impl InvokeStatic {
     pub fn __repr__(&self) -> String {
         format!("InvokeStatic({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 
 #[pyclass]
@@ -158,6 +186,11 @@ impl InvokeInstance {
     pub fn __repr__(&self) -> String {
         format!("InvokeInstance({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 
 #[pyclass]
@@ -182,6 +215,11 @@ impl InvokeConstructor {
     pub fn __repr__(&self) -> String {
         format!("InvokeConstructor({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 
 #[pyclass]
@@ -206,6 +244,11 @@ impl InvokeDirect {
     pub fn __repr__(&self) -> String {
         format!("InvokeDirect({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 
 #[pyclass]
@@ -230,6 +273,11 @@ impl InvokeInterface {
     pub fn __repr__(&self) -> String {
         format!("InvokeInterface({})", self.0.__str__())
     }
+
+    /// Return all strings references in the handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        self.0.get_all_strings()
+    }
 }
 
 impl<'source> FromPyObject<'source> for MethodHandle {
@@ -292,4 +340,19 @@ impl MethodHandle {
             Self::InvokeInterface(val) => val.__str__(),
         }
     }
+
+    /// Return all strings references in the Handle.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        match self {
+            Self::StaticPut(val) => val.get_all_strings(),
+            Self::StaticGet(val) => val.get_all_strings(),
+            Self::InstancePut(val) => val.get_all_strings(),
+            Self::InstanceGet(val) => val.get_all_strings(),
+            Self::InvokeStatic(val) => val.get_all_strings(),
+            Self::InvokeInstance(val) => val.get_all_strings(),
+            Self::InvokeConstructor(val) => val.get_all_strings(),
+            Self::InvokeDirect(val) => val.get_all_strings(),
+            Self::InvokeInterface(val) => val.get_all_strings(),
+        }
+    }
 }
diff --git a/androscalpel/src/scalar.rs b/androscalpel/src/scalar.rs
index db07b8b..0099832 100644
--- a/androscalpel/src/scalar.rs
+++ b/androscalpel/src/scalar.rs
@@ -1,9 +1,9 @@
 //! The class identifying dex structure.
 
-use crate::DexValue;
-use pyo3::prelude::*;
+use std::collections::HashSet;
 
-// TODO: move DexString here
+use crate::{DexString, DexValue};
+use pyo3::prelude::*;
 
 #[pyclass]
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -26,6 +26,11 @@ impl DexByte {
     pub fn __repr__(&self) -> String {
         format!("DexByte({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -49,6 +54,11 @@ impl DexShort {
     pub fn __repr__(&self) -> String {
         format!("DexShort({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -72,6 +82,11 @@ impl DexChar {
     pub fn __repr__(&self) -> String {
         format!("DexChar({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -95,6 +110,11 @@ impl DexInt {
     pub fn __repr__(&self) -> String {
         format!("DexInt({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -118,6 +138,11 @@ impl DexLong {
     pub fn __repr__(&self) -> String {
         format!("DexLong({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -141,6 +166,11 @@ impl DexFloat {
     pub fn __repr__(&self) -> String {
         format!("DexFloat({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -164,6 +194,11 @@ impl DexDouble {
     pub fn __repr__(&self) -> String {
         format!("DexDouble({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 /* DexString is already define in lib.rs, TODO: move the version in lib.rs here
@@ -208,6 +243,11 @@ impl DexNull {
     pub fn __repr__(&self) -> String {
         "DexNull".into()
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -231,6 +271,11 @@ impl DexBoolean {
     pub fn __repr__(&self) -> String {
         format!("DexBoolean({})", self.0)
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        HashSet::new()
+    }
 }
 
 #[pyclass]
@@ -261,4 +306,13 @@ impl DexArray {
     pub fn __repr__(&self) -> String {
         "DexArray(...)".into()
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        let mut strings = HashSet::new();
+        for val in &self.0 {
+            strings.extend(val.get_all_strings());
+        }
+        strings
+    }
 }
diff --git a/androscalpel/src/value.rs b/androscalpel/src/value.rs
index aa0e969..9fc9d56 100644
--- a/androscalpel/src/value.rs
+++ b/androscalpel/src/value.rs
@@ -1,5 +1,7 @@
 //! The class identifying dex structure.
 
+use std::collections::HashSet;
+
 use pyo3::exceptions::PyTypeError;
 use pyo3::prelude::*;
 
@@ -98,6 +100,30 @@ impl DexValue {
             DexValue::Boolean(val) => val.__str__(),
         }
     }
+
+    /// Return all strings references in the value.
+    pub fn get_all_strings(&self) -> HashSet<DexString> {
+        match self {
+            DexValue::Byte(val) => val.get_all_strings(),
+            DexValue::Short(val) => val.get_all_strings(),
+            DexValue::Char(val) => val.get_all_strings(),
+            DexValue::Int(val) => val.get_all_strings(),
+            DexValue::Long(val) => val.get_all_strings(),
+            DexValue::Float(val) => val.get_all_strings(),
+            DexValue::Double(val) => val.get_all_strings(),
+            DexValue::MethodType(val) => val.get_all_strings(),
+            DexValue::MethodHandle(val) => val.get_all_strings(),
+            DexValue::String(val) => val.get_all_strings(),
+            DexValue::Type(val) => val.get_all_strings(),
+            DexValue::Field(val) => val.get_all_strings(),
+            DexValue::Method(val) => val.get_all_strings(),
+            DexValue::Enum(val) => val.get_all_strings(),
+            DexValue::Array(val) => val.get_all_strings(),
+            DexValue::Annotation(val) => val.get_all_strings(),
+            DexValue::Null(val) => val.get_all_strings(),
+            DexValue::Boolean(val) => val.get_all_strings(),
+        }
+    }
 }
 
 impl IntoPy<PyObject> for DexValue {