base64 | 易学教程

How to compress data in swift 3?

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问题 I have some files in file manager in Swift 3. I want to upload them, but when I will convert them into base 64, their size will be huge! so I want to compress the data before converting it into base 64. Here is my code for converting: for i in 0...(rows?.count)! - 1 { let filePath = filesurl[fileManagerViewController.selectedFileIndex[i]] do { let fileData = try Data.init(contentsOf: filePath) let fileStream:String = fileData.base64EncodedString(options: NSData.Base64EncodingOptions.init

JS 图片转Base64

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JS 图片转Base64 有时候需要向HTML中插入一张图片，可苦于上线后找不到一个合适的网盘来存储这些图片，有没有一种办法能将图片转换成文字，然后直接插入HTML中呢，通过 Base64 编码就可以解决这个问题。废话不多说直接上代码。不知道什么是 Base64 的请自行百度。 JS 图片转Base64 图片转Base64 示例代码 <!DOCTYPE html > <html> <head> <meta charset = "UTF-8" > <title> JS 图片转Base64 </title> <script src = "//cdn.bootcss.com/jquery/2.2.0/jquery.min.js" ></script> <script> function run ( input_file , get_data ){ /*input_file：文件按钮对象*/ /*get_data: 转换成功后执行的方法*/ if ( typeof ( FileReader ) === 'undefined' ){ alert ( "抱歉，你的浏览器不支持 FileReader，不能将图片转换为Base64，请使用现代浏览器操作！" ); } else { try { /*图片转Base64 核心代码*/ var file = input_file . files [

html image blob to base64

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问题 I've got some problems about to fileinputjs.The images' src are blob.But i want to use images' src to do something.So i use readAsDataURL to get base64.But there are any problems about it 。 <script type="text/javascript"> $("#last").click(function(){ var blob=document.querySelector(".file-preview-image").src; var reader = new FileReader(); //通过 FileReader 读取blob类型 reader.onload = function(){ this.result === dataURI; //base64编码 } console.log(reader.readAsDataURL(blob)); }) </script> Then there

correct way to embed base64 in json payload with afnetworking

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问题 thanks in advance for any help. I am working with a web service that only takes json payloads and this service is setup for submitting photos. So I am trying to figure out the proper way to embed an image in a json payload. This is my approach. //convert image to nsdata NSData *originalPhoto = UIImageJPEGRepresentation(self.photo.image,.9); //convert the data to a base64 string using NSData+Base64 category extension (Matt Gallagher version) NSString *base64photoString = [originalPhoto

Base64 Encoding: Illegal base64 character 3c

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问题 I am trying to decode data in an xml format into bytes base64 and I am having an issues. My method is in java which takes a String data and converts it into bytes like as bellow. String data = "......"; //string of data in xml format byte[] dataBytes = Base64.getDecoder().decode(data); Which failed and gave the exception like bellow. java.lang.IllegalArgumentException: Illegal base64 character 3c at java.util.Base64$Decoder.decode0(Base64.java:714) at java.util.Base64$Decoder.decode(Base64

Base64-encode a file and compress it

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问题 My goal is to encode a file and zip it in a folder in java. I have to use the Apache's Commons-codec library. I am able to encode and zip it and it works fine but when i decode it back to its original form, it looks like the file has not completely been encoded. Looks like a few parts are missing. Can anybody tell me why this happens? I am also attaching the part of my code for your reference so that you can guide me accordingly. private void zip() { int BUFFER_SIZE = 4096; byte[] buffer =

Python使用base64加密与解密

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import base64 # 输入字符串 ptr = ( 'Python使用base64加密与解密' ) . encode ( encoding = 'utf-8' ) # 加密 p = base64 . b64encode ( ptr ) # 将字节转换位字符串 pp = str ( p , encoding = 'utf-8' ) # 打印 print ( pp ) # 输出结果为：UHl0aG9u5L2/55SoYmFzZTY05Yqg5a+G5LiO6Kej5a+G # base64解密 Q = base64 . b64decode ( pp ) # 将字节转换位字符串 QQ = str ( Q , encoding = 'utf-8' ) # 打印 print ( QQ ) # 输出结果为：Python使用base64加密与解密来源： CSDN 作者： Jacks-os火狐链接： https://blog.csdn.net/jackos521627/article/details/103647951

Base64 encoding for Sec-WebSocket-Accept value

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问题 A while ago, I started experimenting with WebSockets with Node.js taking care of the backend. It was working fine, but now when I return the protocol has been updated and I can't get it to work properly anymore. Specifically, the problem is the Sec-WebSocket-Accept header. I seem to be doing something wrong when calculating it, although I can't really fathom what that might be. As far as I can tell, I'm following the instructions on Wikipedia to the dot. Here's my code: var magicString =

Base64 encoding for Sec-WebSocket-Accept value

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Encoding strings to and from base-64

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问题 I'm trying to encode some strings back and forth from base-64 string and I'm having truble to get the right result. string text = base64string.... //Here I have a base-64 string. byte[] encodedByte = System.Text.ASCIIEncoding.ASCII.GetBytes(text); string base64Encoded = Convert.ToBase64String(encodedByte); if (text == base64Encoded) //If the new encoded string is equal to its original value return base64Encoded; I have tried my ways to do this and I don't seem to get the right result. I have