Tkinter程序经Pyinstaller打包后点击下载按钮弹出多余新窗口如何解决

问题根源 #

Windows系统下multiprocessing模块默认采用spawn模式创建新进程，新进程启动时会重新导入主脚本文件。PyInstaller打包后的exe运行时，新进程没有正确识别入口约束，会重复执行主窗口初始化逻辑，因此每次启动下载进程都会弹出多余的新窗口。

修复步骤 #

仅需要修改主入口代码，新增multiprocessing.freeze_support()调用即可，该调用是PyInstaller适配多进程的标准处理逻辑，不会影响PyCharm本地运行效果。

修改后的完整代码如下：

import tkinter as tk
from download import download_yv as dyv
import multiprocessing

class DownloadPage(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)
        self.grid()
        self.download_flag=True
        self.current_row=0
        self.current_rowspan=0

        self.label1=tk.Label(self,text='Url:',)
        self.label1.grid(row=self.current_row,column=0,)

        self.text1=tk.Entry(self,width=45)
        self.text1.grid(row=self.current_row,column=1,padx=0,pady=0)

        self.current_row+=1
        self.label2=tk.Label(self,text='Save_Dir:',wraplength=200,)
        self.label2.grid(row=self.current_row,column=0)

        self.text2=tk.Entry(self,width=45)
        self.text2.grid(row=self.current_row,column=1,padx=0,pady=0,)

        self.current_row+=1
        self.label3=tk.Label(self,text='Overwrite:',)
        self.label3.grid(row=self.current_row,column=0)

        self.var1=tk.BooleanVar(self)
        self.var1.set('False')
        self.menu1=tk.OptionMenu(self,self.var1,'True','False')
        self.current_rowspan=2
        self.menu1.grid(row=self.current_row,column=1,columnspan=2,rowspan=self.current_rowspan,sticky='news')

        self.current_row+=self.current_rowspan
        self.label4=tk.Label(self,text='Categorize:')
        self.label4.grid(row=self.current_row,column=0)

        self.var2 = tk.BooleanVar(self)
        self.var2.set(True)
        self.menu2=tk.OptionMenu(self,self.var2,'True','False')
        self.menu2.grid(row=self.current_row,column=1,columnspan=2,rowspan=self.current_rowspan,sticky='news')

        self.current_row+=self.current_rowspan
        self.current_rowspan=2
        self.button1=tk.Button(self,text='download',command=self.download)
        self.button1.grid(row=self.current_row,column=1,columnspan=2,rowspan=self.current_rowspan,sticky='news')

        self.current_row+=self.current_rowspan
        self.button2=tk.Button(self,text='Stop Downloading',command=self.stop_download)
        self.button2.grid(row=self.current_row,column=1,columnspan=1,)

    def download(self):
        var1=self.var1.get()
        var2=self.var2.get()
        # print(var1,type(var1),var2,type(var2))
        self.download_process=multiprocessing.Process(target=dyv,args=(self.text1.get(),self.text2.get(),var1,var2))
        self.download_process.start()


    def stop_download(self):

        if self.download_process and self.download_process.is_alive():
            self.download_process.terminate()

if __name__ == '__main__':
    # 新增这一行适配PyInstaller打包多进程场景
    multiprocessing.freeze_support()
    root=tk.Tk()
    app=DownloadPage(root)
    app.mainloop()

修改完成后重新用PyInstaller打包即可解决多余窗口弹出的问题。

内容的提问来源于stack exchange，提问作者user16954854