#!/usr/bin/env python
#-*- coding: utf-8 -*-

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from ctypes import *
from ctypes import cdll

QTextCodec.setCodecForTr(QTextCodec.codecForName("utf8"))

class Calc_MD5:
    md5_dll = cdll.LoadLibrary("md5.dll")

    def calc_md5(self, filename, val):
        new_filename = c_char_p(filename)
        return md5_dll.calc_md5(new_filename)

class InputDlg(QWidget):
    def __init__(self, parent=None):
        super(InputDlg, self).__init__(parent)

        self.setWindowTitle("FileMD5")
        label1 = QLabel(self.tr("文件"))
        self.LineEdit1 = QLineEdit(self)
        label2 = QLabel(self.tr("MD5"))
        self.LineEdit2 = QLineEdit(self)
        self.PushButtonFile = QPushButton(self.tr("..."))
        self.PushButtonData = QPushButton(self.tr("计算"))

        Layout = QGridLayout()
        Layout.addWidget(label1, 0, 0)
        Layout.addWidget(self.LineEdit1, 0, 1)
        Layout.addWidget(self.PushButtonFile, 0, 2)
        Layout.addWidget(label2, 1, 0)
        Layout.addWidget(self.LineEdit2, 1, 1)
        Layout.addWidget(self.PushButtonData, 2, 0)
        self.setLayout(Layout)        
        self.connect(self.PushButtonFile, SIGNAL("clicked()"), self.openFile)
        self.connect(self.PushButtonData, SIGNAL("clicked()"), self.slotData)
        self.Calc = Calc_MD5()
              
    def openFile(self):
        s = QFileDialog.getOpenFileName(self, "Open file dialog", "/")
        self.LineEdit1.setText(str(s))
        new_filename = s
    def slotData(self):
        self.val = self.Calc.calc_md5()  
        self.LineEdit2.setText(str(self.val))

app = QApplication(sys.argv)
M = InputDlg()
M.show()
app.exec_()