image_persistence_demo

Image Persistence Demo

This demo demonstrates the fix for the image disappearance issue when modifying and saving Word documents.

Problem

Previously, when you:

1. Opened a Word document containing images
2. Modified the document (added text, paragraphs, etc.)
3. Saved it as a new file

The images would disappear from the new file.

Solution

The issue has been fixed by:

• Parsing the word/_rels/document.xml.rels file when opening documents
• Preserving existing image relationships
• Updating the image ID counter to prevent conflicts

Running the Demo

go run ./examples/image_persistence_demo/main.go

What the Demo Does

1. Creates an original document with 2 images (red and blue)
2. Opens the document and verifies the images are loaded
3. Modifies the document by adding a new paragraph and a 3rd image (green)
4. Saves the modified document to a new file
5. Verifies all 3 images are present in the final document

Output Files

The demo creates two files in examples/output/:

• image_persistence_original.docx - Original document with 2 images
• image_persistence_modified.docx - Modified document with all 3 images

You can open these files in Microsoft Word or any compatible word processor to verify that all images are correctly preserved.

Expected Result

✓ 图片持久性测试成功！

演示结果：
  - 原始文档: examples/output/image_persistence_original.docx (包含2张图片)
  - 修改后的文档: examples/output/image_persistence_modified.docx (包含3张图片)

说明：
  1. 原有的2张图片（红色和蓝色）在打开和重新保存后没有丢失
  2. 新添加的1张图片（绿色）正确保存
  3. 所有图片在Word中可以正常显示

Related Issue

This demo addresses the issue: "修改后图片消失了" (Images disappear after modification)

Technical Details

The fix involves:

1. parseDocumentRelationships(): Parses existing image and resource relationships
2. updateNextImageID(): Updates the image ID counter based on existing images
3. Enhanced Open() and OpenFromMemory(): Both functions now preserve image relationships

See the commit message and PR description for more details.