Fix first_samp_timestamp_val property does not work due to missing method in LibraryInterpreter

CHANGELOG.md

@@ -30,6 +30,7 @@ All notable changes to this project will be documented in this file.
 
 * ### Resolved Issues
     * [843: read methods use task.in_stream.channels_to_read, which is slow](https://github.com/ni/nidaqmx-python/issues/843)
+    * [639: first_samp_timestamp_val property does not work because LibraryInterpreter is missing a method](https://github.com/ni/nidaqmx-python/issues/639)
 
 * ### Major Changes
     * (IN PROGRESS behind "WAVEFORM_SUPPORT" feature toggle) Added support for reading and writing Waveform data. 

generated/nidaqmx/_base_interpreter.py

@@ -1093,6 +1093,10 @@ def get_timing_attribute_int32(self, task, attribute):
     def get_timing_attribute_string(self, task, attribute):
         raise NotImplementedError
 
+    @abc.abstractmethod
+    def get_timing_attribute_timestamp(self, task, attribute):
+        raise NotImplementedError
+
     @abc.abstractmethod
     def get_timing_attribute_uint32(self, task, attribute):
         raise NotImplementedError

generated/nidaqmx/_grpc_interpreter.py

@@ -2181,6 +2181,12 @@ def get_timing_attribute_string(self, task, attribute):
             grpc_types.GetTimingAttributeStringRequest(task=task, attribute_raw=attribute))
         return response.value
 
+    def get_timing_attribute_timestamp(self, task, attribute):
+        response = self._invoke(
+            self._client.GetTimingAttributeTimestamp,
+            grpc_types.GetTimingAttributeTimestampRequest(task=task, attribute_raw=attribute))
+        return convert_timestamp_to_time(response.value)
+
     def get_timing_attribute_uint32(self, task, attribute):
         response = self._invoke(
             self._client.GetTimingAttributeUInt32,

generated/nidaqmx/_library_interpreter.py

@@ -3730,6 +3730,21 @@ def get_timing_attribute_string(self, task, attribute):
         self.check_for_error(size_or_code)
         return value.value.decode(lib_importer.encoding)
 
+    def get_timing_attribute_timestamp(self, task, attribute):
+        value = AbsoluteTime()
+
+        cfunc = lib_importer.cdll.DAQmxGetTimingAttribute
+        if cfunc.argtypes is None:
+            with cfunc.arglock:
+                if cfunc.argtypes is None:
+                    cfunc.argtypes = [
+                        lib_importer.task_handle, ctypes.c_int32]
+
+        error_code = cfunc(
+            task, attribute, ctypes.byref(value))
+        self.check_for_error(error_code)
+        return value.to_datetime()
+
     def get_timing_attribute_uint32(self, task, attribute):
         value = ctypes.c_uint32()
 

src/codegen/utilities/interpreter_helpers.py

@@ -44,6 +44,8 @@
     "SetRealTimeAttributeUInt32",
     "WaitForNextSampleClock",
     # Time triggers
+    # Single-attribute get/set functions are not used
+    # Generic Get/SetTimingAttribute{Type} functions are used instead
     "GetArmStartTrigTimestampVal",
     "GetArmStartTrigTrigWhen",
     "GetFirstSampClkWhen",
@@ -53,7 +55,6 @@
     "GetStartTrigTrigWhen",
     "GetSyncPulseTimeWhen",
     "GetTimingAttributeExTimestamp",
-    "GetTimingAttributeTimestamp",
     "SetArmStartTrigTrigWhen",
     "SetFirstSampClkWhen",
     "SetStartTrigTrigWhen",

tests/component/task/test_timing_properties.py

@@ -1,3 +1,5 @@
+from datetime import datetime as std_datetime
+
 import pytest
 
 from nidaqmx import DaqError
@@ -470,3 +472,30 @@ def test___timing___set_unint64_property_out_of_range_value___throws_daqerror(
     with pytest.raises(DaqError) as e:
         _ = task.timing.samp_quant_samp_per_chan
     assert e.value.error_type == DAQmxErrors.INVALID_ATTRIBUTE_VALUE
+
+
+def test___timing___get_timestamp_property___returns_value(task, sim_9205_device):
+    task.ai_channels.add_ai_voltage_chan(sim_9205_device.ai_physical_chans[0].name)
+    task.timing.cfg_samp_clk_timing(1000, samps_per_chan=100)
+
+    task.start()
+    timestamp = task.timing.first_samp_timestamp_val
+
+    assert isinstance(timestamp, std_datetime)
+
+    task.stop()
+
+
+def test___timing___get_timestamp_property_with_device_context___throws_daqerror(
+    task, sim_9205_device
+):
+    task.ai_channels.add_ai_voltage_chan(sim_9205_device.ai_physical_chans[0].name)
+    task.timing.cfg_samp_clk_timing(1000, samps_per_chan=100)
+    task.start()
+
+    with pytest.raises(DaqError) as e:
+        _ = task.timing[sim_9205_device].first_samp_timestamp_val
+
+    assert e.value.error_type == DAQmxErrors.M_STUDIO_OPERATION_DOES_NOT_SUPPORT_DEVICE_CONTEXT
+
+    task.stop()