类型错误：内存视图：需要类似字节的对象，而不是“JpegImageFile”

Question

以下代码给我一个错误：

def save(self):
    self.filePath, _ = QFileDialog.getOpenFileName(self, "Open File ", "", "JPEG(*.JPEG *.jpeg *.JPG *.jpg)")
    img =Image.open(self.filePath)
    conn.execute("INSERT INTO DriverInfo(driverImg)VALUES(?)", repr(memoryview(img)))
    conn.commit()

错误是：

TypeError: memoryview: a bytes-like object is required, not 'JpegImageFile'

Answer 1

正如错误消息所示，内存视图期望接收原始字节。要获取组成图像的字节，请执行以下操作：

from io import BytesIO
img = Image.open('1x1.jpg')

# Create a buffer to hold the bytes
buf = BytesIO()

# Save the image as jpeg to the buffer
img.save(buf, 'jpeg')

# Rewind the buffer's file pointer
buf.seek(0)

# Read the bytes from the buffer
image_bytes = buf.read()

# Close the buffer
buf.close()

或者更简洁地说：

from io import BytesIO
img = Image.open('1x1.jpg')

# Create a buffer to hold the bytes
buf = BytesIO()

# Save the image as jpeg to the buffer
img.save(buf, 'jpeg')

# Rewind the buffer's file pointer
buf.seek(0)

# Read the bytes from the buffer
image_bytes = buf.read()

# Close the buffer
buf.close()