2020.04.15

Note1

使用python获取文件创建时间：

# 获取文件的时间属性
# 用到的知识
#   os.getcwd() 方法用于返回当前工作目录
#   os.path.getatime(file) 输出文件访问时间
#   os.path.getctime(file) 输出文件的创建时间
#   os.path.getmtime(file) 输出文件最近修改时间


import time 
import os

def fileTime(file):
    return [
        time.ctime(os.path.getatime(file)),
        time.ctime(os.path.getmtime(file)),
        time.ctime(os.path.getctime(file))
    ]

times = fileTime(os.getcwd())
print(times)
print(type(times))

把时间戳转化为时间

'''把时间戳转化为时间: 1479264792 to 2016-11-16 10:53:12'''
  def TimeStampToTime(timestamp):
    timeStruct = time.localtime(timestamp)
    return time.strftime('%Y-%m-%d %H:%M:%S', timeStruct)

Note2

在QImage上绘制文本

def drawImage(img,info):
    w, h = img.width(), img.height()
    painter=QPainter()
    painter.begin(img)
    painter.setPen(QColor(255,255,255))
    painter.setFont(QFont('SimSun',12))
    painter.drawText(QRect(w*0.1,h-h*0.15,w*0.8,h*0.1),Qt.AlignCenter,info)
    painter.end()
    return img

Note3

opencv打开保存带路径带中文的图片:

读取

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def cv_imread(filePath="", flags=-1):
    cv_img = cv2.imdecode(numpy.fromfile(filePath, dtype=numpy.uint8), flags)
    return cv_img

flags=-1：使用图片默认通道数
flags=0：打开为灰度图
flags=1：打开为彩色图

保存

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def cv_imwrite(cvimg,filepath):
    ext='.'+filepath.split('.')[-1]
    cv2.imencode(ext, cvimg)[1].tofile(filepath)

Note4

opencv、QImage之间的转换：

def CVMat2QImage(cv_image):
    height, width, bytesPerComponent = cv_image.shape
    bytesPerLine = 3 * width
    cv2.cvtColor(cv_image, cv2.COLOR_BGR2RGB, cv_image)
    qimg = QImage(cv_image.data, width, height, bytesPerLine, QImage.Format_RGB888)
    return qimg

def QImage2CVMat(incomingImage):
    '''  Converts a QImage into an opencv MAT format  '''
    incomingImage = incomingImage.convertToFormat(QImage.Format_RGBA8888)
    width = incomingImage.width()
    height = incomingImage.height()
    ptr = incomingImage.bits()
    ptr.setsize(height * width * 4)
    arr = numpy.frombuffer(ptr, numpy.uint8).reshape((height, width, 4))
    return arr

2020.04.16

Note5

configparser读写带中文的配置信息，需要设置编码：

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self.config = configparser.ConfigParser()
self.config.read("init.ini",encoding="utf8")
self.config.write(open("./init.ini", "w",encoding="utf8"))

Note6

pyqt颜色选择器用法：

1	col = QColorDialog.getColor()

Note7

QLineEdit内容修改事件绑定：

1	self.lineedit_textformat.textChanged.connect(...)

Note8

pyinstaller打包时添加图标，使用-i参数：

1	pyinstaller -F -w -i pictures.ico main.py

Note9

读取图片EXIF信息，首先安装包exifread，然后编写如下代码：

f= open(self.filepath, 'rb')
tags = exifread.process_file(f)
timeinfo=None
if 'EXIF DateTimeOriginal' in tags.keys():
    timestr=tags['EXIF DateTimeOriginal'].printable
    imgctime=time.strptime(tags['EXIF DateTimeOriginal'].printable, "%Y:%m:%d %H:%M:%S")
    timeinfo =[imgctime.tm_year,imgctime.tm_mon,imgctime.tm_mday,imgctime.tm_hour,imgctime.tm_min,imgctime.tm_sec]

2020.04.18

Note10

PIL、QImage之间的转换：

from PIL import Image, ImageQt
 
# QImage转Image
image = ImageQt.fromqimage(qimage)
 
# Image转QImage
qimage = ImageQt.ImageQt(image)

参考资料：pyqt5 QImage与PIL Image互转