Python: Message Box in Windows

Current post is on how to show message box in Python 3.2 running on Microsoft Windows OS.

First import the 'ctypes' module. ctypes module provides C compatible data types and allows calling functions in DLLs or shared libraries.

import ctypes

Next we need is the messagebox function pointer

messageBox = ctypes.windll.user32.MessageBoxW  *

After having the function pointer, we just need to call the function with required arguments.

returnValue = messageBox(ParentHandle,Error Text,Title Text,ButtonEnumValue)

where,
           ParentHandle = Handle to parent window
           Error Text = Text one wants to show to end user
           Title Text = Text that will appear on Title bar of message box
           ButtonEnumValue = Which button one needs to show

Detailed information can be found on Microsoft MessageBox Documentation

Based on return value, one can take the required action.

Example 1: Message Box with OK button.

      import ctypes

      messageBox = ctypes.windll.user32.MessageBoxW

      returnValue = messageBox(None,"Message Box!!!","Hello",0x40 | 0x0)

 

Example 2: Message Box with OK-Cancel button & ReturnValue Check

      import ctypes

      messageBox = ctypes.windll.user32.MessageBoxW

      returnValue = messageBox(None,"Message Box!!!","Hello",0x40 | 0x1)

      if returnValue = = 1:
            print("Pressed OK")
     elif returnValue = = 2:
           print("Pressed Cancel")

* Python 3.x takes unicode only.