如何多次更新 python 中的 windowText？

Question

我一直在寻找代码来帮助解决这个问题。这是我能在下面找到的最佳答案。

import win32api
import win32con
import win32gui
import time
import threading

#Code example modified from:
#Christophe Keller
#Hello World in Python using Win32

# New code: Define global
windowText = 'Hello send by Python via Win32!'

def main():
    #get instance handle
    hInstance = win32api.GetModuleHandle()

    # the class name
    className = 'SimpleWin32'

    # create and initialize window class
    wndClass                = win32gui.WNDCLASS()
    wndClass.style          = win32con.CS_HREDRAW | win32con.CS_VREDRAW
    wndClass.lpfnWndProc    = wndProc
    wndClass.hInstance      = hInstance
    wndClass.hIcon          = win32gui.LoadIcon(0, win32con.IDI_APPLICATION)
    wndClass.hCursor        = win32gui.LoadCursor(0, win32con.IDC_ARROW)
    wndClass.hbrBackground  = win32gui.GetStockObject(win32con.WHITE_BRUSH)
    wndClass.lpszClassName  = className

    # register window class
    wndClassAtom = None
    try:
        wndClassAtom = win32gui.RegisterClass(wndClass)
    except Exception as e:
        print (e)
        raise e

    hWindow = win32gui.CreateWindow(
        wndClassAtom,                   #it seems message dispatching only works with the atom, not the class name
        'Python Win32 Window',
        win32con.WS_OVERLAPPEDWINDOW,
        win32con.CW_USEDEFAULT,
        win32con.CW_USEDEFAULT,
        win32con.CW_USEDEFAULT,
        win32con.CW_USEDEFAULT,
        0,
        0,
        hInstance,
        None)

    # Show & update the window
    win32gui.ShowWindow(hWindow, win32con.SW_SHOWNORMAL)
    win32gui.UpdateWindow(hWindow)

    # New code: Create and start the thread
    thr = threading.Thread(target=customDraw, args=(hWindow,))
    thr.setDaemon(False)
    thr.start()

    # Dispatch messages
    win32gui.PumpMessages()


# New code: Attempt to change the text 1 second later
def customDraw(hWindow):
    global windowText
    time.sleep(1.0)
    windowText = 'Something new'
    win32gui.RedrawWindow(hWindow, None, None, win32con.RDW_INVALIDATE | win32con.RDW_ERASE)


def wndProc(hWnd, message, wParam, lParam):

    if message == win32con.WM_PAINT:
        hDC, paintStruct = win32gui.BeginPaint(hWnd)

        rect = win32gui.GetClientRect(hWnd)
        win32gui.DrawText(
            hDC,
            windowText,
            -1,
            rect,
            win32con.DT_SINGLELINE | win32con.DT_CENTER | win32con.DT_VCENTER)

        win32gui.EndPaint(hWnd, paintStruct)
        return 0

    elif message == win32con.WM_DESTROY:
        print('Being destroyed')
        win32gui.PostQuitMessage(0)
        return 0

    else:
        return win32gui.DefWindowProc(hWnd, message, wParam, lParam)

if __name__ == '__main__':
    main()

不幸的是输出是"Hello send by Python via Win32!"然后是"something new"

这是一个好的开始，但我需要 "something new" 更新到 "something new 2" 和 "something new 3" 等

我是否可以从包含 "something new" "something new 2" "something new 3" 等的文本文件中显示 "something new 2" 和 "something new 3" 等？

更新 "windowText = something new" 如果我不得不一遍又一遍地输入，那么更新会很长，所以也许最好逐行显示文本文件。

所以我的问题是如何一次一行显示文本文件中的文本 "something new"

或者如何使用当前代码轻松显示 "something new 2" "something new 3" 等？

Answer 1

使用 SetTimer 而不是创建额外的线程。示例：

import win32api, win32con, win32gui
import timer

windowText = 'Hello send by Python via Win32!'
hWindow = 0

def main():
    hInstance = win32api.GetModuleHandle()
    className = 'SimpleWin32'

    wndClass                = win32gui.WNDCLASS()
    wndClass.style          = win32con.CS_HREDRAW | win32con.CS_VREDRAW
    wndClass.lpfnWndProc    = wndProc
    wndClass.hInstance      = hInstance
    wndClass.hIcon          = win32gui.LoadIcon(0, win32con.IDI_APPLICATION)
    wndClass.hCursor        = win32gui.LoadCursor(0, win32con.IDC_ARROW)
    wndClass.hbrBackground  = win32gui.GetStockObject(win32con.WHITE_BRUSH)
    wndClass.lpszClassName  = className
    wndClassAtom = win32gui.RegisterClass(wndClass)

    hWindow = win32gui.CreateWindow(wndClassAtom,                   
        'Python Win32 Window',
        win32con.WS_OVERLAPPEDWINDOW, 0, 0, 600, 400, 0, 0, hInstance, None)

    win32gui.ShowWindow(hWindow, win32con.SW_SHOWNORMAL)
    win32gui.UpdateWindow(hWindow)
    timer.set_timer(1000, customDraw)
    win32gui.PumpMessages()

counter = 0
def customDraw(timer_id, time):
    global hWindow
    global counter
    global windowText
    if counter > 2:
        counter = 0
    text = ["test 0", "test 1", "test 2"]
    windowText = text[counter]
    counter = counter + 1
    win32gui.InvalidateRect(hWindow, None, True)

def wndProc(hWnd, message, wParam, lParam):
    if message == win32con.WM_PAINT:
        hDC, paintStruct = win32gui.BeginPaint(hWnd)
        rect = win32gui.GetClientRect(hWnd)
        win32gui.DrawText(hDC, windowText, -1, rect,
            win32con.DT_SINGLELINE | win32con.DT_CENTER | win32con.DT_VCENTER)
        win32gui.EndPaint(hWnd, paintStruct)
        return 0

    elif message == win32con.WM_DESTROY:
        print('Being destroyed')
        win32gui.PostQuitMessage(0)
        return 0

    else:
        return win32gui.DefWindowProc(hWnd, message, wParam, lParam)

if __name__ == '__main__':
    main()

如何多次更新 python 中的 windowText？

how to update windowText in python multiple times?

python

pywin32

pywin