problème avec thread

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#!/usr/bin/python
# -*- coding: cp1252 -*-
 
import sys, os
from shutil import copy
from subprocess import Popen
from time import sleep
import threading
from PyQt4 import QtCore, QtGui
 
 
from ximReader import recupInfo
import constante as ct
 
#from DataSet import DataSet
from ui_mainWindow import Ui_MainWindow
 
CODE = ["AUTRES"]
 
class MainWindow(QtGui.QDialog):
    def __init__(self, parent = None):
        QtGui.QDialog.__init__(self, parent)
        self._ui = Ui_MainWindow()
        self._ui.setupUi(self)
        self.settings = QtCore.QSettings("./configuration.ini", QtCore.QSettings.IniFormat) ### revoir la bonne classe
        self.run = True
 
        self.lineEditCodeAcier = {}
        self.lineEditDataCodeAcier = {}
        self._createStackedWidgets()
        self._connectSlots()
 
        self.loadSettings()
        self.show()
 
    def _connectSlots(self):
        self._createToolDirFunc(self._ui.lineEditImg, self._ui.toolButtonImg)
        self._createToolDirFunc(self._ui.lineEditGraph, self._ui.toolButtonGraph)
        self._createToolDirFunc(self._ui.lineEditCastext, self._ui.toolButtonCastext)
        self._createToolDirFunc(self._ui.lineEditPlugCastext, self._ui.toolButtonPlugCastext)
        self._createToolFileRFunc(self._ui.lineEditDataBase, self._ui.toolButtonOpenDataBase)
        self._createToolFileWFunc(self._ui.lineEditDataBase, self._ui.toolButtonDataBase)
 
        self.connect(self._ui.btnLancer, QtCore.SIGNAL("clicked()"), self.start)
        self.connect(self._ui.btnArreter, QtCore.SIGNAL("clicked()"), self.stop)
        self.connect(self._ui.btnQuitter, QtCore.SIGNAL("clicked()"), self.closeApp)
 
    def _createStackedWidgets(self):
        self._ui.stackedWidget.removeWidget(self._ui.stackedWidget.widget(0))
        self._ui.stackedWidget.removeWidget(self._ui.stackedWidget.widget(0))
        for codeAcier in CODE:
            widget = QtGui.QWidget()
            textLabel = QtGui.QLabel("Chemin du surfaceset du code acier : " + codeAcier)
            toolButton = QtGui.QToolButton()
            toolButton.setText("...")
            self.lineEditCodeAcier[codeAcier] = QtGui.QLineEdit()
            self._createToolFileFunc(self.lineEditCodeAcier[codeAcier], toolButton)
 
            textLabel2 = QtGui.QLabel("Chemin du fichier du code acier : " + codeAcier)
            toolButton2 = QtGui.QToolButton()
            toolButton2.setText("...")
            self.lineEditDataCodeAcier[codeAcier] = QtGui.QLineEdit()
            self._createToolFileFunc(self.lineEditDataCodeAcier[codeAcier], toolButton2)
 
            layout = QtGui.QGridLayout()
            layout.addWidget(textLabel, 0, 0, 1, 4)
            layout.addWidget(self.lineEditCodeAcier[codeAcier], 0, 4, 1, 3)
            layout.addWidget(toolButton, 0, 7, 1, 1)
            layout.addWidget(textLabel2, 1, 0, 1, 4)
            layout.addWidget(self.lineEditDataCodeAcier[codeAcier], 1, 4, 1, 3)
            layout.addWidget(toolButton2, 1, 7, 1, 1)
            widget.setLayout(layout)
 
            self._ui.codeAcierComboBox.addItem(codeAcier)
 
            self._ui.stackedWidget.addWidget(widget)
 
    def _createToolFileFunc(self, lineEdit, toolButton):
        def choseFile():
            fileName = QtGui.QFileDialog.getOpenFileName(self, "Choisir le fichier", ".")
            if fileName != "":
                lineEdit.setText(fileName)
        self.connect(toolButton, QtCore.SIGNAL("clicked()"),
                     choseFile)
 
    def _createToolFileWFunc(self, lineEdit, toolButton):
        def choseFile():
            fileName = QtGui.QFileDialog. getSaveFileName(self, "Choisir le fichier", ".")
            if fileName != "":
                if not str(fileName).endswith('.h5'):
                    fileName += '.h5'
                lineEdit.setText(fileName)
        self.connect(toolButton, QtCore.SIGNAL("clicked()"),
                     choseFile)
 
    def _createToolFileRFunc(self, lineEdit, toolButton):
        def choseFile():
            fileName = QtGui.QFileDialog. getOpenFileName(self, "Choisir le fichier", ".")
            if fileName != "":
                lineEdit.setText(fileName)
        self.connect(toolButton, QtCore.SIGNAL("clicked()"),
                     choseFile)
 
    def _createToolDirFunc(self, lineEdit, toolButton):
        def choseDirectory():
            dirName = QtGui.QFileDialog.getExistingDirectory(self)
            if dirName != "":
                dirName+='/'
                lineEdit.setText(dirName)
        self.connect(toolButton, QtCore.SIGNAL("clicked()"),
                     choseDirectory)
 
 
    def saveSettings(self):
        self.settings.setValue("castextDir", QtCore.QVariant(self._ui.lineEditCastext.text()))
        self.settings.setValue("plugCastextDir", QtCore.QVariant(self._ui.lineEditPlugCastext.text()))
        self.settings.setValue("nbImage", QtCore.QVariant(str(self._ui.spinBoxNumberImg.value())))
        for code in CODE:
            self.settings.setValue("code" + code, QtCore.QVariant(self.lineEditCode[ code].text()))
            self.settings.setValue("codeData" + code, QtCore.QVariant(self.lineEditDataCode[ code].text()))
 
    def loadSettings(self):
        self._ui.lineEditCastext.setText(self.settings.value("castextDir").toString())
        self._ui.lineEditPlugCastext.setText(self.settings.value("plugCastextDir").toString())
        numberImage = self.settings.value("nbImage").toString()
        if numberImage == "":
            numberImage = 3
        self._ui.spinBoxNumberImg.setValue(int(numberImage))
        for code in CODE:
            self.lineEditCode[ code].setText(self.settings.value("code" + code).toString())
            self.lineEditDataCode[ code].setText(self.settings.value("codeData" + code).toString())
 
    def start(self):
        self.saveSettings()
    thread = threading.Thread(target = self.calcul)
        thread.start()
 
    def calcul(self):
        if not os.path.isfile("imageTraite.txt"):
            procImFile = open("imageTraite.txt", "w")
            procImFile.close()
        procImFile = open("imageTraite.txt", "r")
        processedImages = [f[:-1] for f in procImFile.readlines()]
        procImFile.close()
        procImFile = open("imageTraite.txt", "a")
        arguments = [self._ui.lineEditImg.text(),
                     self._ui.lineEditGraph.text(),
                     self._ui.lineEditDataBase.text(),
                     self._ui.lineEditCastext.text(),
                     self._ui.lineEditPlugCastext.text()]
        if "" in arguments[:4]:
            # A refaire avec une boîte de dialogue
            print "ERROR : argument non valide"
            return
        arguments = ' '.join(map(str, arguments))
 
        for code in CODE:
            arguments += ' ' + ' '.join([ code,
                                         str(self.lineEditCodeAcier[ code].text()),
                                         str(self.lineEditDataCode[ code].text())])
 
        self.run = True
        while self.run:
            files = [f for f in os.listdir(str(self._ui.lineEditImg.text())) \
                     if f.startswith("dei") and f.endswith(".xim") and f not in processedImages]
            cp = 0
            viderTemp2()
            for f in files:
                print str(self._ui.lineEditImg.text()) + f, processedImages
                readDone = False
                while not readDone:
                    try:
                        if isValid(str(self._ui.lineEditImg.text()) + f, processedImages) :#and f not in traitedFile :
                            print "INFO : copie started : " + f
                            copy(str(self._ui.lineEditImg.text()) + f, "temp2/" + f)
                            processedImages.append(f)
                            procImFile.write(f + '\n')
                            readDone = True
                            cp+=1
                            print "INFO : copie finished"
                    except IOError:
                        sleep(1) # On attend une seconde pour laisser le temps à l'image d'être recopier, en supposant que l'exception venait bien de là...
                        print "impossible de lire ", f, " nouvelle tentative"
                if cp == self._ui.spinBoxNumberImg.value():
                    directory = os.path.dirname(sys.argv[0]) ###Je m'arete la, il faut redef le process, et avant, stop[0]
 
                    process = Popen('\"' + directory + "\\mainProc.py " + arguments + '\"',
                                    shell = True, cwd = directory) # a mettre a jour en fonction de la machine
                    process.wait()
                    viderTemp2()
                    cp = 0
 
                if cp > 0 and cp < self._ui.spinBoxNumberImg.value():
                    directory = os.path.dirname(sys.argv[0])
                    process = Popen('\"' + directory + "\\mainProc.py " + arguments + '\"', shell = True, cwd = directory) # a mettre a jour en fonction de la machine
                    process.wait()
                    viderTemp2()
                    cp = 0
                if not self.run:
                    break
            if not self.run:
                print "***********PROGRAMME TERMINE AVEC SUCCES***********"
 
 
 
        procImFile.close()
 
    def stop(self):
        self.run = False
 
    def closeApp(self):
        pass
        self.close()
 
### rajouter le nom du coil dans ll'image de la projection
### Rajouter dans le bouton d'interogation une aide d'utilisation
 
if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
 
    window = MainWindow()
 
    sys.exit(app.exec_())