Implement function to get metadata by name

src/calibre/devices/mtp/windows/content_enumeration.cpp

@@ -493,6 +493,16 @@ list_folder(IPortableDevice *device, CComPtr<IPortableDeviceContent> &content, I
     return ans.detach();
 }
 
+PyObject*
+get_metadata(CComPtr<IPortableDeviceContent> &content, const wchar_t *object_id) {
+    CComPtr<IPortableDeviceKeyCollection> properties(create_filesystem_properties_collection());
+    if (!properties) return NULL;
+    CComPtr<IPortableDeviceProperties> devprops;
+    HRESULT hr = content->Properties(&devprops);
+    if (FAILED(hr)) { hresult_set_exc("Failed to get IPortableDeviceProperties interface", hr); return NULL; }
+    return get_object_properties(devprops, properties, object_id);
+}
+
 PyObject*
 find_in_parent(CComPtr<IPortableDeviceContent> &content, const wchar_t *parent_id, PyObject *name) {
     HRESULT hr;

src/calibre/devices/mtp/windows/device.cpp

@@ -109,6 +109,37 @@ list_folder_by_name(Device *self, PyObject *args) {
     return wpd::list_folder(self->device, content, self->bulk_properties, parent_id.ptr());
 } // }}}
 
+// get_metadata_by_name() {{{
+
+static PyObject*
+get_metadata_by_name(Device *self, PyObject *args) {
+    wchar_raii parent_id; PyObject *names;
+    CComPtr<IPortableDeviceContent> content;
+    HRESULT hr; bool found = false;
+
+    Py_BEGIN_ALLOW_THREADS;
+    hr = self->device->Content(&content);
+    Py_END_ALLOW_THREADS;
+    if (FAILED(hr)) { hresult_set_exc("Failed to create content interface", hr); return NULL; }
+
+
+    if (!PyArg_ParseTuple(args, "O&O!", py_to_wchar, &parent_id, &PyTuple_Type, &names)) return NULL;
+    for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(names); i++) {
+        PyObject *k = PyTuple_GET_ITEM(names, i);
+        if (!PyUnicode_Check(k)) { PyErr_SetString(PyExc_TypeError, "names must contain only unicode strings"); return NULL; }
+        pyobject_raii l(PyObject_CallMethod(k, "lower", NULL)); if (!l) return NULL;
+        pyobject_raii object_id(wpd::find_in_parent(content, parent_id.ptr(), l.ptr()));
+        if (!object_id) {
+            if (PyErr_Occurred()) return NULL;
+            Py_RETURN_NONE;
+        }
+        if (!py_to_wchar_(object_id.ptr(), &parent_id)) return NULL;
+        found = true;
+    }
+    if (!found) Py_RETURN_NONE;
+    return wpd::get_metadata(content, parent_id.ptr());
+} // }}}
+
 // create_folder() {{{
 static PyObject*
 py_create_folder(Device *self, PyObject *args) {
@@ -151,6 +182,10 @@ static PyMethodDef Device_methods[] = {
      "list_folder_by_name(parent_id, names) -> List the folder specified by names (a tuple of name components) relative to parent_id from the device. Return None or a list of entries."
     },
 
+    {"get_metadata_by_name", (PyCFunction)get_metadata_by_name, METH_VARARGS,
+     "get_metadata_by_name(parent_id, names) -> get metadata for the file or folder folder specified by names (a tuple of name components) relative to parent_id from the device. Return None or metadata."
+    },
+
     {"get_file", (PyCFunction)py_get_file, METH_VARARGS,
      "get_file(object_id, stream, callback=None) -> Get the file identified by object_id from the device. The file is written to the stream object, which must be a file like object. If callback is not None, it must be a callable that accepts two arguments: (bytes_read, total_size). It will be called after each chunk is read from the device. Note that it can be called multiple times with the same values."
     },

src/calibre/devices/mtp/windows/driver.py

@@ -400,6 +400,15 @@ class MTP_DEVICE(MTPDeviceBase):
             raise DeviceError(f'Could not find folder named: {"/".join(names)} in {parent.full_path}')
         return list(x.values())
 
+    @same_thread
+    def get_mtp_metadata_by_name(self, parent, *names: str):
+        if not parent.is_folder:
+            raise ValueError(f'{parent.full_path} is not a folder')
+        x = self.dev.get_metadata_by_name(parent.object_id, names)
+        if x is None:
+            raise DeviceError(f'Could not find folder named: {"/".join(names)} in {parent.full_path}')
+        return x
+
     @same_thread
     def get_mtp_file(self, f, stream=None, callback=None):
         if f.is_folder:

src/calibre/devices/mtp/windows/global.h

@@ -54,4 +54,5 @@ extern PyObject* find_in_parent(
 extern PyObject* list_folder(
         IPortableDevice *device, CComPtr<IPortableDeviceContent> &content, IPortableDevicePropertiesBulk *bulk_properties,
         const wchar_t *folder_id);
+extern PyObject* get_metadata(CComPtr<IPortableDeviceContent> &content, const wchar_t *object_id);
 }