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在日常办公中，ppt文件往往因为图片过大而导致文件体积过大，不便于传输和存储。为了应对这一问题，我们可以使用python的wxpython图形界面库结合python-pptx和pillow，开发一个简单的pptx压缩工具。本文将详细介绍如何实现这一功能。
全部代码
import wx
import os
from pptx import presentation
from pil import image
import io
class compressorframe(wx.frame):
def __init__(self):
super().__init__(parent=none, title='pptx压缩工具')
self.panel = wx.panel(self)
self.create_ui()
def create_ui(self):
vbox = wx.boxsizer(wx.vertical)
# 文件选择部分
hbox1 = wx.boxsizer(wx.horizontal)
self.file_path = wx.textctrl(self.panel, size=(300, -1))
browse_btn = wx.button(self.panel, label='选择文件')
browse_btn.bind(wx.evt_button, self.on_browse)
hbox1.add(self.file_path, proportion=1, flag=wx.expand|wx.all, border=5)
hbox1.add(browse_btn, flag=wx.all, border=5)
# 压缩按钮
compress_btn = wx.button(self.panel, label='开始压缩')
compress_btn.bind(wx.evt_button, self.on_compress)
# 进度条
self.progress = wx.gauge(self.panel, range=100, size=(400, 25))
# 状态文本
self.status_text = wx.statictext(self.panel, label="")
vbox.add(hbox1, flag=wx.expand|wx.all, border=5)
vbox.add(compress_btn, flag=wx.align_center|wx.all, border=5)
vbox.add(self.progress, flag=wx.expand|wx.all, border=5)
vbox.add(self.status_text, flag=wx.expand|wx.all, border=5)
self.panel.setsizer(vbox)
self.fit()
def on_browse(self, event):
with wx.filedialog(self, "选择pptx文件", wildcard="powerpoint files (*.pptx)|*.pptx",
style=wx.fd_open | wx.fd_file_must_exist) as filedialog:
if filedialog.showmodal() == wx.id_cancel:
return
path = filedialog.getpath()
path = os.path.normpath(path.strip('"'))
self.file_path.setvalue(path)
def update_status(self, text):
wx.callafter(self.status_text.setlabel, text)
def on_compress(self, event):
if not self.file_path.getvalue():
wx.messagebox('请先选择文件', '提示', wx.ok | wx.icon_information)
return
input_path = self.file_path.getvalue().strip('"')
input_path = os.path.normpath(input_path)
if not os.path.exists(input_path):
wx.messagebox('文件不存在，请检查路径', '错误', wx.ok | wx.icon_error)
return
output_path = self._get_output_path(input_path)
try:
self._compress_pptx(input_path, output_path)
wx.messagebox('压缩完成！\n保存路径：' + output_path,
'成功', wx.ok | wx.icon_information)
except exception as e:
wx.messagebox(f'压缩过程中出错：{str(e)}',
'错误', wx.ok | wx.icon_error)
finally:
self.progress.setvalue(0)
self.update_status("")
def _get_output_path(self, input_path):
directory = os.path.dirname(input_path)
filename = os.path.basename(input_path)
name, ext = os.path.splitext(filename)
return os.path.join(directory, f"{name}_compressed{ext}")
def _compress_pptx(self, input_path, output_path):
try:
prs = presentation(input_path)
except exception as e:
raise exception(f"无法打开pptx文件: {str(e)}")
total_slides = len(prs.slides)
processed_images = 0
skipped_images = 0
for i, slide in enumerate(prs.slides):
self.update_status(f"正在处理第 {i+1}/{total_slides} 张幻灯片")
shapes_with_images = []
for shape in slide.shapes:
if hasattr(shape, "image"):
shapes_with_images.append(shape)
for shape in shapes_with_images:
try:
# 获取图片数据
image_bytes = shape.image.blob
# 使用pil压缩图片
with image.open(io.bytesio(image_bytes)) as img:
# 转换rgba为rgb
if img.mode == 'rgba':
img = img.convert('rgb')
# 压缩图片
# 如果图片较大，调整尺寸
max_size = 800 # 最大尺寸为1024像素
if img.width > max_size or img.height > max_size:
ratio = min(max_size/img.width, max_size/img.height)
new_size = (int(img.width * ratio), int(img.height * ratio))
img = img.resize(new_size, image.lanczos)
output_buffer = io.bytesio()
img.save(output_buffer, format='jpeg', quality=10, optimize=true)
# 替换原图片
shape._element.blip.embed.rid = shape._element.blip.embed.rid
new_image = output_buffer.getvalue()
# 更新图片数据
image_part = shape.image
image_part._blob = new_image
processed_images += 1
except exception as e:
print(f"处理图片时出错: {str(e)}")
skipped_images += 1
continue
# 更新进度条
progress = int((i + 1) / total_slides * 100)
wx.callafter(self.progress.setvalue, progress)
self.update_status(f"完成！成功处理 {processed_images} 张图片，跳过 {skipped_images} 张图片")
try:
prs.save(output_path)
except exception as e:
raise exception(f"保存文件时出错: {str(e)}")
def main():
app = wx.app()
frame = compressorframe()
frame.show()
app.mainloop()
if __name__ == '__main__':
main()
环境准备
在开始之前，我们需要安装以下python库：
- wxpython：用于创建图形用户界面
- python-pptx：用于处理pptx文件
- pillow：用于图片压缩
安装命令：
pip install wxpython python-pptx pillow
代码结构
代码主要包括以下几个部分：
- 图形界面设计
- 文件选择与压缩功能
- 图片压缩逻辑
代码实现
导入必要模块
import wx import os from pptx import presentation from pil import image import io
创建主窗口
主窗口compressorframe继承自wx.frame，用于展示ui组件。
class compressorframe(wx.frame):
def __init__(self):
super().__init__(parent=none, title='pptx压缩工具')
self.panel = wx.panel(self)
self.create_ui()
def create_ui(self):
vbox = wx.boxsizer(wx.vertical)
# 文件选择部分
hbox1 = wx.boxsizer(wx.horizontal)
self.file_path = wx.textctrl(self.panel, size=(300, -1))
browse_btn = wx.button(self.panel, label='选择文件')
browse_btn.bind(wx.evt_button, self.on_browse)
hbox1.add(self.file_path, proportion=1, flag=wx.expand|wx.all, border=5)
hbox1.add(browse_btn, flag=wx.all, border=5)
# 压缩按钮
compress_btn = wx.button(self.panel, label='开始压缩')
compress_btn.bind(wx.evt_button, self.on_compress)
# 进度条
self.progress = wx.gauge(self.panel, range=100, size=(400, 25))
# 状态文本
self.status_text = wx.statictext(self.panel, label="")
vbox.add(hbox1, flag=wx.expand|wx.all, border=5)
vbox.add(compress_btn, flag=wx.align_center|wx.all, border=5)
vbox.add(self.progress, flag=wx.expand|wx.all, border=5)
vbox.add(self.status_text, flag=wx.expand|wx.all, border=5)
self.panel.setsizer(vbox)
self.fit()文件选择功能
通过文件对话框让用户选择pptx文件。
def on_browse(self, event):
with wx.filedialog(self, "选择pptx文件", wildcard="powerpoint files (*.pptx)|*.pptx",
style=wx.fd_open | wx.fd_file_must_exist) as filedialog:
if filedialog.showmodal() == wx.id_cancel:
return
path = filedialog.getpath()
self.file_path.setvalue(os.path.normpath(path.strip('"')))
压缩功能实现
压缩图片逻辑：
- 使用pillow库压缩ppt中的图片，将其转换为jpeg格式，并降低质量以减少文件大小。
- 限制图片的最大尺寸，保持图片的可视质量。
更新进度条与状态：
使用wx.gauge展示处理进度。
实时更新处理状态。
def _compress_pptx(self, input_path, output_path):
prs = presentation(input_path)
total_slides = len(prs.slides)
processed_images = 0
skipped_images = 0
for i, slide in enumerate(prs.slides):
self.update_status(f"正在处理第 {i+1}/{total_slides} 张幻灯片")
shapes_with_images = [shape for shape in slide.shapes if hasattr(shape, "image")]
for shape in shapes_with_images:
try:
image_bytes = shape.image.blob
with image.open(io.bytesio(image_bytes)) as img:
if img.mode == 'rgba':
img = img.convert('rgb')
max_size = 800
if img.width > max_size or img.height > max_size:
ratio = min(max_size/img.width, max_size/img.height)
new_size = (int(img.width * ratio), int(img.height * ratio))
img = img.resize(new_size, image.lanczos)
output_buffer = io.bytesio()
img.save(output_buffer, format='jpeg', quality=10, optimize=true)
new_image = output_buffer.getvalue()
shape.image._blob = new_image
processed_images += 1
except exception as e:
print(f"处理图片时出错: {str(e)}")
skipped_images += 1
wx.callafter(self.progress.setvalue, int((i + 1) / total_slides * 100))
self.update_status(f"完成！成功处理 {processed_images} 张图片，跳过 {skipped_images} 张图片")
prs.save(output_path)主函数
启动wxpython应用程序。
def main():
app = wx.app()
frame = compressorframe()
frame.show()
app.mainloop()
if __name__ == '__main__':
main()
运行结果
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