使用Python开发PPTX压缩工具

引言

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。
C:\pythoncode\new\compresspptx.py

全部代码

import wx
import os
from pptx import Presentation
from PIL import Image
import ioclass 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:returnpath = 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)returninput_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)returnoutput_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 = 0skipped_images = 0for 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RGBif 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.rIdnew_image = output_buffer.getvalue()# 更新图片数据image_part = shape.imageimage_part._blob = new_imageprocessed_images += 1except Exception as e:print(f"处理图片时出错: {str(e)}")skipped_images += 1continue# 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：

1. 图形界面设计
2. 文件选择与压缩功能
3. 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:returnpath = fileDialog.GetPath()self.file_path.SetValue(os.path.normpath(path.strip('"')))

压缩功能实现

1. 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。

2. 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 = 0skipped_images = 0for 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.blobwith Image.open(io.BytesIO(image_bytes)) as img:if img.mode == 'RGBA':img = img.convert('RGB')max_size = 800if 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_imageprocessed_images += 1except Exception as e:print(f"处理图片时出错: {str(e)}")skipped_images += 1wx.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