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Create app.py
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app.py
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| 1 |
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# app.py
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# Hugging Face Spaces (Gradio / CPU) 单文件应用:
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# 上传图片 -> 点击按钮 -> 输出 Base64 字符串(可选 data URI 前缀、可选换行)
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import base64
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import mimetypes
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import textwrap
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from pathlib import Path
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import gradio as gr
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def image_to_base64(
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image_path: str | None,
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add_data_uri_prefix: bool,
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wrap_lines: bool,
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wrap_width: int,
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) -> tuple[str, int]:
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"""
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将图片文件转换为 Base64 字符串。
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- image_path: gr.Image(type="filepath") 传入的本地临时文件路径
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- add_data_uri_prefix: 是否加 data:{mime};base64, 前缀
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- wrap_lines: 是否按固定宽度换行(便于复制到某些工具/配置文件)
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- wrap_width: 换行宽度(常见 76/80)
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"""
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if not image_path:
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return "请先上传一张图片。", 0
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p = Path(image_path)
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if not p.exists():
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return f"文件不存在:{image_path}", 0
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# 读入原始二进制数据(保持原格式,不做重编码)
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data = p.read_bytes()
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# 猜测 MIME(无法识别时给一个保守默认值)
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mime, _ = mimetypes.guess_type(str(p))
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if not mime:
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mime = "image/png"
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# Base64 编码
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b64 = base64.b64encode(data).decode("utf-8")
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# 是否加 data URI 前缀
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result = f"data:{mime};base64,{b64}" if add_data_uri_prefix else b64
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# 是否换行(注意:若加了 data URI 前缀,换行也会一起换行)
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if wrap_lines:
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w = int(wrap_width) if wrap_width else 76
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w = max(20, min(w, 500)) # 做个合理范围保护
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result = "\n".join(textwrap.wrap(result, width=w))
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return result, len(result)
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with gr.Blocks(title="Image → Base64 (CPU)") as demo:
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gr.Markdown(
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"# Image → Base64\n"
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"上传图片后点击 **转换**,即可得到 Base64 字符串。\n\n"
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"- 支持可选 `data:image/...;base64,` 前缀\n"
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"- 支持可选按固定宽度换行\n\n"
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"提示:图片较大时,Base64 字符串会非常长(体积约增加 1/3)。"
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)
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with gr.Row():
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inp = gr.Image(
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label="上传图片",
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type="filepath", # 关键:回调函数收到的是文件路径字符串
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sources=["upload"],
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)
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with gr.Row():
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add_prefix = gr.Checkbox(value=False, label="添加 data URI 前缀(data:image/...;base64,)")
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wrap = gr.Checkbox(value=False, label="按固定宽度换行")
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width = gr.Slider(
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minimum=40,
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maximum=200,
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value=76,
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step=1,
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label="换行宽度(wrap width)",
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)
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with gr.Row():
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btn = gr.Button("转换", variant="primary")
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clear = gr.Button("清空")
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out = gr.Textbox(
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label="Base64 输出(可直接复制)",
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lines=14,
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interactive=False,
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placeholder="这里会显示 Base64 字符串……",
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)
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out_len = gr.Number(label="输出字符数", value=0, interactive=False)
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btn.click(
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fn=image_to_base64,
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inputs=[inp, add_prefix, wrap, width],
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outputs=[out, out_len],
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)
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def _clear():
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return None, False, False, 76, "", 0
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clear.click(
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fn=_clear,
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inputs=[],
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outputs=[inp, add_prefix, wrap, width, out, out_len],
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)
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if __name__ == "__main__":
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demo.launch()
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