如何返回要打印的条目中的内容

Question

我试图在我的输入框中返回要打印的内容，但即使我选择了 tkinter 提出的按钮提醒我选择强制按钮，消息框也会弹出。

挑战：

1. 当我在选择打印按钮之前选择强制按钮时，仍然会弹出消息框。

2. 如果我不输入条目小部件，它的消息会弹出来提醒我，但选择按钮也会弹出两次，而不是只弹出消息框来提醒我。 也将所有功能传递给打印按钮。我的强制按钮是在选择时抬起，然后在执行命令后返回正常状态。

   import tkinter as tk
   
   from tkinter import messagebox
   import win32print, win32ui, win32con
   
   
   def output():
       global choosed
   
       now = new.get()
   
       if not choosed:
           messagebox.showerror("error", "select the buttons")
       elif len(now) == 0:
           messagebox.showerror("error", "entry empty")
       else:
          return (now)
   
   
   def accept_output():
   
       dc = win32ui.CreateDC()
       printername = win32print.GetDefaultPrinter()
       dc.CreatePrinterDC(printername)
       dc.SetMapMode(win32con.MM_TWIPS)
       scale_factor = 20
       dc.StartDoc('Win32print ')
       pen = win32ui.CreatePen(0, int(scale_factor), 0)
       dc.SelectObject(pen)
       font = win32ui.CreateFont({
           "name": "Lucida Console",
           "height": int(scale_factor * 10),
           "weight": 400,
       })
       dc.SelectObject(font)
       dc.TextOut(scale_factor * 72,-1 * scale_factor * 72, output())# to 
   receive the content in the entry widget
       dc.EndDoc()
   
   
   def raised_button(button_object):
       global choosed
   
       if choosed: # previously clicked
           choosed.configure(relief=tk.RAISED, state=tk.ACTIVE)
   
       choosed = button_object
       button_object.configure(relief=tk.SUNKEN, state=tk.DISABLED)
   
   
   def stop():
       global choosed
   
       choosed = None
   
       lot1.configure(relief=tk.RAISED, state=tk.ACTIVE)
   
   
   root = tk.Tk()
   root.geometry("400x400")
   
   
   new = tk.StringVar()
   en = tk.Entry(root, textvariable=new).pack()
   
   choosed = False
   
   lot1 = tk.Button(root, text="compulsory to select")
   lot1.configure(command=lambda button_object=lot1: 
   raised_button(button_object))
   lot1.pack(side="left")
   
   B=tk.Button(root, text="print number", command=lambda:[output(), stop(), 
   accept_output()])
   B.place(x=150, y=300)
   
   root.mainloop()
   

我在 accept_output() 上添加了 output() 函数，但仍然遇到同样的错误。

   def accept_output():

    global choosed

    now = new.get()

    if not choosed:
       messagebox.showerror("error", "select one of the buttons")
    elif len(now) == 0:
       messagebox.showerror("error", "entry empty")
    else:
        return (now)  # when i add the output here it gives select button

欢迎您提出关于返回条目小部件中的内容的建议，以便通过选择强制按钮打印该内容。

Answer 1

我认为你这样做是错误的 - 你在 accept_output() 内执行 output() 所以你无法阻止它。当一切正常时，您必须在output() 中执行accept_output()。

import tkinter as tk

from tkinter import messagebox
import win32print, win32ui, win32con


def output():
    global choosed

    text = new.get()

    if not choosed:
        messagebox.showerror("error", "select the buttons")
    elif len(text) == 0:
        messagebox.showerror("error", "entry empty")
    else:
        accept_output(text)

    choosed = None
    lot1.configure(relief=tk.RAISED, state=tk.ACTIVE)


def accept_output(text):

    print("printing ...", text)

    dc = win32ui.CreateDC()
    printername = win32print.GetDefaultPrinter()
    dc.CreatePrinterDC(printername)
    dc.SetMapMode(win32con.MM_TWIPS)
    scale_factor = 20
    dc.StartDoc('Win32print ')
    pen = win32ui.CreatePen(0, int(scale_factor), 0)
    dc.SelectObject(pen)
    font = win32ui.CreateFont({
        "name": "Lucida Console",
        "height": int(scale_factor * 10),
        "weight": 400,
    })
    dc.SelectObject(font)
    dc.TextOut(scale_factor * 72,-1 * scale_factor * 72, text) # <- text 
    dc.EndDoc()


def raised_button(button_object):
    global choosed

    # function will be not accesible if you use state=tk.DISABLED
    # so I remove state=tk.DISABLED

    if choosed: # previously clicked 
        choosed.configure(relief=tk.RAISED)
        choosed = None
    else:    
        button_object.configure(relief=tk.SUNKEN)
        choosed = button_object

# --- main ---

choosed = False

root = tk.Tk()

new = tk.StringVar()
tk.Entry(root, textvariable=new).pack()

lot1 = tk.Button(root, text="Compulsory to select")
lot1.configure(command=lambda button_object=lot1:raised_button(button_object))
lot1.pack()

tk.Button(root, text="Print number", command=output).pack()

root.mainloop()

---

您可以使用Checkbutton 而不是Button，您将不需要函数choosen 和raised_button。如果您使用indicatoron=False，Checkbutton 甚至可以看起来像普通按钮。

import tkinter as tk

from tkinter import messagebox
import win32print, win32ui, win32con

def output():

    text = new.get()

    if not option1.get() and not option2.get():
        messagebox.showerror("error", "select options")
    elif len(text) == 0:
        messagebox.showerror("error", "entry empty")
    else:
        accept_output(text)

    option1.set(False)
    option2.set(False)

def accept_output(text):

    print("printing ...", text)

    dc = win32ui.CreateDC()
    printername = win32print.GetDefaultPrinter()
    dc.CreatePrinterDC(printername)
    dc.SetMapMode(win32con.MM_TWIPS)
    scale_factor = 20
    dc.StartDoc('Win32print ')
    pen = win32ui.CreatePen(0, int(scale_factor), 0)
    dc.SelectObject(pen)
    font = win32ui.CreateFont({
        "name": "Lucida Console",
        "height": int(scale_factor * 10),
        "weight": 400,
    })
    dc.SelectObject(font)
    dc.TextOut(scale_factor * 72,-1 * scale_factor * 72, text) # <- text 
    dc.EndDoc()

# --- main ---

root = tk.Tk()

new = tk.StringVar()
tk.Entry(root, textvariable=new).pack()

option1 = tk.BooleanVar(value=False)
tk.Checkbutton(root, text="Compulsory to select (option1)", var=option1).pack()

option2 = tk.BooleanVar(value=False)
tk.Checkbutton(root, text="Compulsory to select (option2)", var=option2, indicatoron=False).pack()

tk.Button(root, text="Print number", command=output).pack()

root.mainloop()