DLL load failed: The specified module could not be found.

• OS and version used: <VERSION> Windows 10

• Python runtime used: <VERSION> 3.5.5 (Anaconda)

• SDK version used: <VERSION> 1.4.1

Description of the issue:

I am trying to run the sample SimulatedDevice.py to send telemetry data to my IoThub but I am getting DLL load Failed error

Code sample exhibiting the issue:

import random
import time
import sys

import iothub_client
from iothub_client import IoTHubClient, IoTHubClientError, IoTHubTransportProvider, IoTHubClientResult
from iothub_client import IoTHubMessage, IoTHubMessageDispositionResult, IoTHubError, DeviceMethodReturnValue

MyNodeDevice --output table
CONNECTION_STRING = "REMOVED"

PROTOCOL = IoTHubTransportProvider.MQTT
MESSAGE_TIMEOUT = 10000

TEMPERATURE = 20.0
HUMIDITY = 60
MSG_TXT = "{\"temperature\": %.2f,\"humidity\": %.2f}"

def send_confirmation_callback(message, result, user_context):
    print ( "IoT Hub responded to message with status: %s" % (result) )

def iothub_client_init():
   
    client = IoTHubClient(CONNECTION_STRING, PROTOCOL)
    return client

def iothub_client_telemetry_sample_run():

    try:
        client = iothub_client_init()
        print ( "IoT Hub device sending periodic messages, press Ctrl-C to exit" )

        while True:
           
            temperature = TEMPERATURE + (random.random() * 15)
            humidity = HUMIDITY + (random.random() * 20)
            msg_txt_formatted = MSG_TXT % (temperature, humidity)
            message = IoTHubMessage(msg_txt_formatted)

            prop_map = message.properties()
            if temperature > 30:
              prop_map.add("temperatureAlert", "true")
            else:
              prop_map.add("temperatureAlert", "false")

            print( "Sending message: %s" % message.get_string() )
            client.send_event_async(message, send_confirmation_callback, None)
            time.sleep(1)

    except IoTHubError as iothub_error:
        print ( "Unexpected error %s from IoTHub" % iothub_error )
        return
    except KeyboardInterrupt:
        print ( "IoTHubClient sample stopped" )

if __name__ == '__main__':
    print ( "IoT Hub Quickstart #1 - Simulated device" )
    print ( "Press Ctrl-C to exit" )
    iothub_client_telemetry_sample_run()

Console log of the issue:

 Traceback (most recent call last):
  File "SimulatedDevice.py", line 11, in <module>
    import iothub_client
  File "C:\Users\Waleed\AppData\Local\Programs\Python\Python35\lib\site-packages\iothub_client\__init__.py", line 1, in <module>
    from .iothub_client import *
ImportError: DLL load failed: The specified module could not be found. 

[edit:pierreca:2018-8-12] formatting

[WaleedSehgal]

@pierreca Yes seems like there is an issue with python versions other than 3.6. Between I was able to run the sample successfully upon setting my environment to python 3.6

[pierreca]

@tpenland thanks for reporting this. this all seems to confirm we have a problem with python versions that are not 3.6. we’re looking into it.