From 8cabac1a19b436e9ec3dc0142ec3efb49a48cdd6 Mon Sep 17 00:00:00 2001
From: syntron <syntron@web.de>
Date: Wed, 5 Nov 2025 23:57:58 +0100
Subject: [PATCH 1/2] [OMCSessionZMQ] add method to escape strings

---
 OMPython/ModelicaSystem.py | 2 +-
 OMPython/OMCSession.py     | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/OMPython/ModelicaSystem.py b/OMPython/ModelicaSystem.py
index 241b9ffc..e91d3c52 100644
--- a/OMPython/ModelicaSystem.py
+++ b/OMPython/ModelicaSystem.py
@@ -2037,7 +2037,7 @@ def prepare(self) -> int:
 
                 pk_value = pc_structure[idx_structure]
                 if isinstance(pk_value, str):
-                    pk_value_str = pk_value.replace('"', '\\"')
+                    pk_value_str = self.session().escape_str(pk_value)
                     expression = f"setParameterValue({self._model_name}, {pk_structure}, \"{pk_value_str}\")"
                 elif isinstance(pk_value, bool):
                     pk_value_bool_str = "true" if pk_value else "false"
diff --git a/OMPython/OMCSession.py b/OMPython/OMCSession.py
index fca7c47d..f0c78ef1 100644
--- a/OMPython/OMCSession.py
+++ b/OMPython/OMCSession.py
@@ -336,7 +336,7 @@ def write_text(self, data: str, encoding=None, errors=None, newline=None):
         if not isinstance(data, str):
             raise TypeError(f"data must be str, not {data.__class__.__name__}")
 
-        data_omc = data.replace('"', '\\"')
+        data_omc = self._session.escape_str(data)
         self._session.sendExpression(f'writeFile("{self.as_posix()}", "{data_omc}", false);')
 
         return len(data)
@@ -576,6 +576,13 @@ def __del__(self):
 
         self.omc_zmq = None
 
+    @staticmethod
+    def escape_str(value: str) -> str:
+        """
+        Escape a string such that it can be used as string within OMC expressions, i.e. escape all double quotes.
+        """
+        return value.replace("\\", "\\\\").replace('"', '\\"')
+
     def omcpath(self, *path) -> OMCPath:
         """
         Create an OMCPath object based on the given path segments and the current OMC session.

From cefda6620852bbd808cf3f9ed8f572e62f201a0a Mon Sep 17 00:00:00 2001
From: syntron <syntron@web.de>
Date: Thu, 6 Nov 2025 19:44:46 +0100
Subject: [PATCH 2/2] [test_OMCPath] add test_OMCPath_write_file

test escape of double quotes and backslash in OMCPath.write_text() / .read_text()
---
 tests/test_OMCPath.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/test_OMCPath.py b/tests/test_OMCPath.py
index b8e937f3..00844905 100644
--- a/tests/test_OMCPath.py
+++ b/tests/test_OMCPath.py
@@ -76,3 +76,17 @@ def _run_OMCPath_checks(om: OMPython.OMCSessionZMQ):
     assert p3.parent.is_dir()
     p3.unlink()
     assert p3.is_file() is False
+
+
+def test_OMCPath_write_file(tmpdir):
+    om = OMPython.OMCSessionZMQ()
+
+    data = "abc # \\t # \" # \\n # xyz"
+
+    p1 = om.omcpath_tempdir()
+    p2 = p1 / 'test.txt'
+    p2.write_text(data=data)
+
+    assert data == p2.read_text()
+
+    del om