How Multiple Processes Interact

[monkeycc]

import dearpygui.dearpygui as dpg
from multiprocessing import Process

def example_process():

    print("Hello DearPyGui!")

    dpg.set_value("hello_text", "Hello DearPyGui!")

def start_process(sender, data):
    test_process = Process(target=example_process)
    test_process.start()

dpg.create_context()
dpg.create_viewport(title='Custom Title', width=600, height=300)

with dpg.window(label="Example Window"):
    dpg.add_text("Hello, world",tag="hello_text",)
    dpg.add_button(label="button1", callback=start_process,width=100,height=100)

if __name__ == "__main__":

    dpg.setup_dearpygui()
    dpg.show_viewport()
    dpg.start_dearpygui()
    dpg.destroy_context()

Subprocess How to Control GUI Framework

[v-ein]

Since the main program and the subprocess are separate processes, you can only send messages from the subprocess to the main process and then do all the UI work in the main process. Use whatever inter-process communication (IPC) mechanism you find convenient. The doc on the multiprocessing module has a couple of sections on IPC - start with this one:

https://docs.python.org/3/library/multiprocessing.html#exchanging-objects-between-processes