基于python实现图片处理与pdf生成小程序

import wx                    # GUI框架
import os                    # 操作系统接口
import zipfile              # ZIP文件处理
import tempfile, shutil     # 临时文件和文件操作
import sys                  # 系统相关参数
from PIL import Image       # 图像处理
from reportlab.pdfgen import canvas  # PDF生成
from reportlab.lib.pagesizes import A4  # PDF页面规格
import locale               # 本地化支持

class ImagePDFFrame(wx.Frame):  # 主窗口类
class ImagePDFApp(wx.App):      # 应用程序类

main_sizer = wx.BoxSizer(wx.VERTICAL)    # 主垂直布局
file_sizer = wx.StaticBoxSizer(...)      # 文件操作区域
work_sizer = wx.BoxSizer(wx.HORIZONTAL)  # 工作区域水平布局

def on_extract_zip(self, event):
    with zipfile.ZipFile(self.zip_path, 'r') as zip_ref:
        for member in zip_ref.infolist():
            try:
                # 多层编码尝试机制
                member.filename = member.filename.encode('cp437').decode('utf-8')
            except:
                try:
                    member.filename = member.filename.encode('cp437').decode('gbk')
                except:
                    pass  # 保持原文件名
            zip_ref.extract(member, extract_dir)

def preview_image(self, image_path):
    pil_image = Image.open(image_path)
    
    # 智能缩放算法
    preview_size = (300, 300)
    pil_image.thumbnail(preview_size, Image.Resampling.LANCZOS)
    
    # 格式转换链
    wx_image = wx.Image(pil_image.size[0], pil_image.size[1])
    wx_image.SetData(pil_image.convert('RGB').tobytes())
    
    # 显示更新
    bitmap = wx.Bitmap(wx_image)
    self.image_preview.SetBitmap(bitmap)

def on_generate_pdf(self, event):
    c = canvas.Canvas(pdf_path, pagesize=A4)
    page_width, page_height = A4
    
    for i in range(self.selected_listbox.GetCount()):
        pil_image = Image.open(image_path)
        img_width, img_height = pil_image.size
        
        # 智能缩放计算
        margin = 50
        max_width = page_width - 2 * margin
        max_height = page_height - 2 * margin
        
        scale_w = max_width / img_width
        scale_h = max_height / img_height
        scale = min(scale_w, scale_h, 1.0)  # 不放大原则
        
        # 居中对齐计算
        new_width = img_width * scale
        new_height = img_height * scale
        x = (page_width - new_width) / 2
        y = (page_height - new_height) / 2
        
        c.drawImage(image_path, x, y, width=new_width, height=new_height)
        c.showPage()  # 新页面
    
    c.save()

self.select_zip_btn.Bind(wx.EVT_BUTTON, self.on_select_zip)
self.image_listbox.Bind(wx.EVT_LISTBOX, self.on_image_select)

try:
    # 核心操作
    pil_image = Image.open(image_path)
except Exception as e:
    self.log(f"预览图片失败: {str(e)}")
    # 优雅降级，不影响主流程

def log(self, message):
    if isinstance(message, bytes):
        message = message.decode('utf-8', errors='ignore')
    self.status_text.AppendText(f"{message}\n")

def __del__(self):
    if hasattr(self, 'temp_dir') and self.temp_dir:
        try:
            shutil.rmtree(self.temp_dir)
        except:
            pass

if sys.version_info[0] >= 3:
    import locale
    encoding = locale.getpreferredencoding() if hasattr(locale, 'getpreferredencoding') else 'utf-8'