User32__DATETIMEPICK_CLASS.py

import win32gui
import win32con
import win32api
import commctrl
import struct
import math
from ctypes import windll, wintypes, Structure, c_ushort, sizeof, create_unicode_buffer
# the code that process data from SendMessage is generated by AI and edit by me

# fix win32timezone.SYSTEMTIME https://stackoverflow.com/questions/51566069/python-ctypes-sizeof-always-returns-0
class SYSTEMTIME(Structure):
    _fields_ = [
        ('wYear', c_ushort),
        ('wMonth', c_ushort),
        ('wDayOfWeek', c_ushort),
        ('wDay', c_ushort),
        ('wHour', c_ushort),
        ('wMinute', c_ushort),
        ('wSecond', c_ushort),
        ('wMilliseconds', c_ushort),
    ]

# Define the GetDeviceCaps function signature
GetDeviceCaps = windll.gdi32.GetDeviceCaps
GetDeviceCaps.argtypes = [wintypes.HDC, wintypes.INT]
GetDeviceCaps.restype = wintypes.INT

dp_hwnd = int()  # Store the combobox handle

def WndProc(hwnd, msg, wParam, lParam):
    global dp_hwnd
    if msg == win32con.WM_COMMAND and wParam == 102:  # Assuming 102 is the ID of the submit button
        # Get selected item from the combobox
        st = SYSTEMTIME()
        buf = create_unicode_buffer(sizeof(st))
        # Send DTM_GETSYSTEMTIME message to get the system time
        system_time = win32gui.SendMessage(dp_hwnd, commctrl.DTM_GETSYSTEMTIME, 0, buf)
        bytes_data = bytes(buf)[:16]
        unpacked_data = struct.unpack('<HHHHHHHH', bytes_data) # '<' for little-endian, 8 H (unsigned shorts)

        st.wYear = unpacked_data[0]
        st.wMonth = unpacked_data[1]
        st.wDayOfWeek = unpacked_data[2]
        st.wDay = unpacked_data[3]
        st.wHour = unpacked_data[4]
        st.wMinute = unpacked_data[5]
        st.wSecond = unpacked_data[6]
        st.wMilliseconds = unpacked_data[7]
        date_str = f"{st.wYear}-{st.wMonth}-{st.wDay}"
        print(date_str)

    elif msg == win32con.WM_DESTROY:
        win32gui.PostQuitMessage(0)
    return win32gui.DefWindowProc(hwnd, msg, wParam, lParam)

def main():
    dpiX = 0
    dpiY = 0
    hdc = win32gui.GetDC(0)  # 0 represents the entire screen
    if hdc:
        dpiX = GetDeviceCaps(hdc, win32con.LOGPIXELSX)
        dpiY = GetDeviceCaps(hdc, win32con.LOGPIXELSY)
        win32gui.ReleaseDC(0, hdc)

    width = int(math.ceil(640.0 * dpiX / 96.0))
    height = int(math.ceil(480.0 * dpiY / 96.0))
    
    wc = win32gui.WNDCLASS()
    wc.lpszClassName = "MyWindowClass"
    wc.lpfnWndProc = WndProc
    class_atom = win32gui.RegisterClass(wc)
    hwnd = win32gui.CreateWindow(class_atom, "My Window", win32con.WS_OVERLAPPEDWINDOW,
                                win32con.CW_USEDEFAULT, win32con.CW_USEDEFAULT, width, height, 0, 0, 0, None)

    # Example combobox creation (adjust xpos, ypos, nwidth, nheight, hwndParent)
    xpos, ypos = 10, 10  # Example position
    nwidth, nheight = 200, 20 # Example size
    hwndParent = hwnd # Set parent to the main window
    
    # Create a listbox control
    global dp_hwnd
    dp_hwnd = win32gui.CreateWindow(commctrl.DATETIMEPICK_CLASS, "",
                                            win32con.WS_BORDER | win32con.WS_CHILD | win32con.WS_VISIBLE | win32con.WS_OVERLAPPED | commctrl.DTS_SHOWNONE, # Style
                                            xpos, ypos, nwidth, nheight, hwndParent, 101, 0, None)
    
    # Create a button
    button_hwnd = win32gui.CreateWindow("BUTTON", "Submit", win32con.WS_VISIBLE | win32con.WS_CHILD,
                                       20, 120, 80, 25, hwnd, 102, 0, None)

    win32gui.ShowWindow(hwnd, win32con.SW_SHOWNORMAL)
    win32gui.UpdateWindow(hwnd)
    win32gui.PumpMessages()

if __name__ == "__main__":
    main()