我正在尝试创建一个能够将图像上传到https://www.google.de/searchbyimage/upload的应用程序。我做到了这一点(通过C#发布multipart / form-data)
我现在唯一需要知道的是: 浏览器发送的图像通常如何?在multipart / form-data中,我在嗅探请求中找到了一个名为“image_content”的东西,它存储了图像数据。 但我不知道图像的存储格式。
------WebKitFormBoundaryumAjUbPr6ymfh8hM
Content-Disposition: form-data; name="image_content"
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------WebKitFormBoundaryumAjUbPr6ymfh8hM
有什么建议吗?
答案 0 :(得分:1)
默认编码为base64。您应该形成一个与您的嗅探请求相匹配的请求,但以下情况除外:
WebKitFormBoundaryumAj...
字符串应附加一个随机字符串以确保其唯一性_9j_
行应替换为您要上传的图片的base64编码内容。服务器会自动检测文件类型(JPG,PNG等),因此您不必担心。
答案 1 :(得分:0)
这是base64编码的图像。实际上,您可以在许多地方使用它,例如CSS和JavaScript。您基本上可以将它放在任何需要通常URI的地方。您也可以用这种方式编码许多不同的东西(例如@ font-face中使用的字体)。
在大多数现代计算机语言中,都有内置的base64编码功能 - 只需谷歌用于C#中的一个,如果你正在使用它。
您可以在此处详细了解数据URI的使用情况:https://developer.mozilla.org/en-US/docs/data_URIs,也许在这里:http://css-tricks.com/data-uris/