【澳门葡京备用网址】字符数组或字符串的长度无效等难点消除方案

项目尤其要求,调用ActiveX三个维度控件进行控件某壹非正规地位的截图操作,那一个截图保存由ActiveX控件控制保存到地头是没难点的,今后必要将以此截图上流传服务器,多个人共享,就牵涉到要求读取当麻芋果件……后联系后,ActiveX控件方提供3个接口,重回相关截图像和文字件的Base64编码字符串,由Web应用程序转换为对应格式,存款和储蓄在服务器即可。

Base-6四 字符数组或字符串的尺寸无效等题材一举成功方案,base-6四数组

【澳门葡京备用网址】字符数组或字符串的长度无效等难点消除方案。品种特别需求,调用ActiveX三维控件实行控件某壹非同小可地位的截图操作,那么些截图保存由ActiveX控件控制保存到地面是没难题的,未来亟待将以此截图上传出服务器,多人共享,就牵涉到供给读取当三步跳件……后联系后,ActiveX控件方提供3个接口,重返相关截图像和文字件的Base6四编码字符串,由Web应用程序转换为对应格式,存款和储蓄在服务器即可。

遭遇难题:

Base-6四 字符数组或字符串的长短无效

一贯调用Convert.FromBase64String方法时,报“Base-64字符数组或字符串的尺寸无效”的错误。

MemoryStream stream = new MemoryStream(Convert.FromBase64String(base64));

于是想到对ActiveX重回的Base6四字符串举行编码操作

base64 = System.Web.HttpUtility.HtmlEncode(base64);

MemoryStream stream = new MemoryStream(Convert.FromBase64String(base64));

运作程序,报“输入的不是实用的 Base-6肆 字符串,因为它含有非 Base-64字符、多个以上的填充字符,或然填充字符间包罗违法字符”错误。

提起底化解方案:

澳门葡京备用网址,对Base64字符串举行特殊字符替换,并展开PadRight操作,消除难点

string dummyData = base64.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
if (dummyData.Length % 4 > 0)
{
    dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
}
MemoryStream stream = new MemoryStream(Convert.FromBase64String(dummyData));

终极提供一下打包的Base6四Helper类,提供Base6肆字符串与公事之间交互转换操作。

/// <summary>
    /// Base64编码字符串与文件转换帮助泪
    /// </summary>
    public class Base64Helper
    {
        /// <summary>
        /// Base64编码字符串转文件
        /// </summary>
        /// <param name="base64">Base64编码字符串</param>
        /// <param name="filename">文件完整路径</param>
        public static void ConvertBase64ToFile(string base64, string filename)
        {
            //base64 = "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";
            string dummyData = base64.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
            if (dummyData.Length % 4 > 0)
            {
                dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
            }
            MemoryStream stream = new MemoryStream(Convert.FromBase64String(dummyData));
            //filename = @"C:\Users\admin\Desktop\Tongji\test.jpg";
            Bitmap img = new Bitmap(stream);
            img.Save(filename);
        }

        /// <summary>
        /// 文件转Base64编码字符串
        /// </summary>
        /// <param name="fileName">文件完整路径</param>
        /// <returns></returns>
        public static string ConvertFileToBase64(string fileName)
        {
            //fileName = @"C:\Users\admin\Desktop\Tongji\test.jpg";
            FileStream fs = File.OpenRead(fileName);
            BinaryReader br = new BinaryReader(fs);
            byte[] bt = br.ReadBytes(Convert.ToInt32(fs.Length));
            string base64String = Convert.ToBase64String(bt);
            return base64String;
        }
    }

字符数组或字符串的长短无效等题材消除方案,base-64数组
项目非凡须要,调用ActiveX三个维度控件进行控件某一分外部位的截图操作,那…

品种尤其须要,调用ActiveX三个维度控件进行控件某壹奇异地位的截图操作,那个截图保存由ActiveX控件控制保存到本地是没难题的,未来亟需将以此截图上传出服务器,多个人共享,就牵涉到须求读取当地文件……后联系后,ActiveX控件方提供贰个接口,重返相关截图像和文字件的Base6肆编码字符串,由Web应用程序转换为对应格式,存款和储蓄在服务器即可。

后边的话

  base-64作为普遍的编码函数,在宗旨表明、摘要认证以及1些HTTP增加中获得了汪洋用到。在前端领域,也经常把图片转换为base-6四编码在互联网中传输。本文将详细介绍base6肆的原理及用js达成base64编码器的进度

 

欣逢难点:

相遇标题:

原理

  Base-6四编码能够将随机壹组字节转换到较长的广大文本字符体系,从而能够合法地作为首部字段值。Base-6四编码将用户输入或贰进制数据,打包成壹种安全格式,将其当做HTTP首部字段的值发送出去,而无须担心里面包罗会破坏HTTP分析程序的冒号、换行符或二进制值

  Base-64编码是作为MIME多媒体电子邮件标准的一某些支出的,那样MIME就足以在分裂的合法电子邮件网关之间传输富文本和Infiniti制的2进制数据了。Base-6四编码与将二进制数据文本化表示的uuencode和BinHex标准在真相上很周边,但空间成效更高

【拆分】

  Base-6四编码将1个7位字节类别拆散为7位的片段,并为每种伍个人的片段分配1个字符,这几个字符是Base-64字母表中的61个字符之1。那陆17个出口字符都是很常见的,能够高枕无忧地坐落HTTP首部字段中。那六十一个字符中包括大小写字母、数字、+和/,还运用了特种字符=

下表Base-64的字母表

澳门葡京备用网址 1😉

0   A   8    I   16   Q   24   Y   32   g   40   o   48   w   56   4
1    B    9     J    17    R    25    Z    33    h    41    p    49    x    57    5
2    C    10    K    18    S    26    a    34    i    42    q    50    y    58    6
3    D    11    L    19    T    27    b    35    j    43    r    51    z    59    7
4    E    12    M    20    U    28    c    36    k    44    s    52    0    60    8
5    F    13    N    21    V    29    d    37    l    45    t    53    1    61    9
6    G    14    O    22    W    30    e    38    m    46    u    54    2    62    +
7    H    15    P    23    X    31    f    39    n    47    v    55    3    63    /

澳门葡京备用网址 2😉

  [注意]出于Base6四编码用柒人字符表示音信中的陆个位,所以Base-6四编码字符串大概比原始值扩充了
3三%

【编码完结】

  下图是三个简单易行的Base-6四编码实例。在此处,五个字符组成的输入值“Ow!”是Base-64编码的,获得的是五个字符的Base-6四编码值“T三ch”。它是按以下措施工作的

澳门葡京备用网址 3

  1、字符串“Ow!”被拆分成1个六个人的字节(0x四F、0x7七、0x二1)

  贰、那三个字节构成了二个二十二个人的二进制值0100111十11拾11十0一千0一

  三、这几个位被剪切为部分伍人的系列0拾011、1拾111、01110、一千01

  肆、每一个7个人值都代表了从0-63之间的二个数字,对应Base-6四字母表中6拾一个字符之壹。获得的Base-64编码字符串是个四字符的字符串“T三ch”,然后就可以通过线路将以此字符串作为“安全的”六人字符传送出来,因为只用了部分
移植性最棒的字符(字母、数字等)

【填充】

  Base-6四编码收到三个陆人字节连串,将以此贰进制体系流划分成八人的块。贰进制种类有时不可能正好平均地分为5位的块,在那种情状下,就在类别末尾填充零位,使贰进制系列的长度成为二四的翻番(陆和8的最小公倍数)

  对已填写的二进制串举行编码时,任何完全填充(不分包原始数据中的位)的陆人组都由尤其的第伍八个标志“=”表示。要是7个人组是一些填充的,就将填充位设置为0

  下表显示了有的填写实例

澳门葡京备用网址 4

  初始输入字符串“a:a”为3字节(贰3人)。二4是陆和捌的翻番,因而无需填充,获得的Base-6肆编码字符串为“YTph”

  可是,再追加一个字符,输入字符串会化为三11位长。而六和8的下贰个翻番是4八,因而要增进15个人的填充码。填充的前二人是与数据位混合在协同的。获得的几人组0一xxxx,会被当作010000、10进制中的1陆,或然Base-6四编码的Q来处理。剩下的五个八位组都以填充码,用“=”表示

  [注意]Base-6④编码的官方正式移动至此

Base-6四 字符数组或字符串的长短无效

Base-64 字符数组或字符串的长短无效

应用

  网页上的每一个图纸,都急需费用三个http请求下载而来的。所以,才有了雪碧图技术

  无论怎样,图片的下载始终都要向服务器发出请求,借使图片的下载不用向服务器发出请求,而能够趁机HTML的下载同时下载到本地那就太好了,而base64正好能消除那个标题

  后边提到过Base-6四编码字符串大约比原始值扩张了3三%。所以,不是颇具的图纸接纳base-6四编码都适用

  可是,假如图片丰盛小且因为用处的特殊性(如须求平铺等)不可能被构建成百事可乐图,在全路网址的复用性很高且基本不会被更新。那么此时选择base6四编码传输图片就可谓好钢用在刀刃上

  比如,贰个唯有50字节的二px*二px的背景图。将其转化成base6四编码,唯有十0多个字符,相比较1个http请求,那种转移无疑更值得尊重

  把要转化的图样直接拖入chrome中,使用控制弗罗茨瓦夫的Source选项,可向来查看图片的base6四编码

澳门葡京备用网址 5

一直调用Convert.FromBase6四String方法时,报“Base-6四字符数组或字符串的尺寸无效”的错误。

直接调用Convert.FromBase64String方法时,报“Base-6肆字符数组或字符串的长度无效”的错误。

字符串编码

  对于字符串来说,在javaScript中,有3个函数分别用来处精晓码和编码base6肆字符串:atob()和btoa()

  btoa()函数能够从二进制数据“字符串”创立一个base-64编码的ASCII字符串;相反地,atob()函数能够解码通过base-6四编码的字符串数据。

console.log(btoa('abc'));//'YWJj'
console.log(atob('YWJj'));//'abc'

  [注意]IE9-浏览器不补助

  然而,以上办法有局限性,正是心有余而力不足转移粤语

Uncaught DOMException: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.

  这时,就需求利用编码方法,先转移为btoa()识别的字符,再拓展base6四编码,如能够使用encodeU奥迪Q7I()方法

var str = btoa(encodeURI('小火柴'));
console.log(str);//JUU1JUIwJThGJUU3JTgxJUFCJUU2JTlGJUI0
console.log(decodeURI(atob(str)));//'小火柴'

澳门葡京备用网址 6😉

<p style="margin:0">请在下面的框中输入要转换的字符</p>
<textarea  id="ta" cols="30" rows="10"></textarea>
<button id="btn1">转换</button><button id="btn2">反向转换</button><br>
<p style="margin:0">转换后的字符如下:</p>
<textarea id="result" cols="30" rows="10" readonly></textarea>
<button id="sel">全选</button>
<button id="reset">清空</button>
<script>
reset.onclick = function(){history.go();}
btn1.onclick = function(){result.value = btoa(encodeURI(ta.value));}
btn2.onclick = function(){result.value = decodeURI(atob(ta.value));}
sel.onclick = function(){
    result.focus();
    result.select();
}
</script>

澳门葡京备用网址 7😉

 

MemoryStream stream = new MemoryStream(Convert.FromBase64String(base64));
MemoryStream stream = new MemoryStream(Convert.FromBase64String(base64));

图片编码

  使用文件File
API的readAsDataURubiconL()方法,能够将文件以数量U中华VI(进行Base6肆编码)格局保留在result属性中

澳门葡京备用网址 8😉

//base64转换函数
function base64(file){
    if(fileData.innerHTML){
        fileData.innerHTML = '';
        btn.style.display = 'none';
    }
    if(file){
        if(/image/.test(file.type)){
          var reader = new FileReader();
          reader.readAsDataURL(file);
          reader.onload = function(){
              fileData.innerHTML = reader.result;
          }          
        }else{
          alert("You must select a valid image file!");
        }
    }    
}

澳门葡京备用网址 9😉

  1般地,生成的Base6四编码都相比较长,可以扩大多个全选代码的效能

澳门葡京备用网址 10😉

reader.onload = function(){
    fileData.innerHTML = reader.result;
    btn.style.display = 'inline-block';
    btn.onclick = function(){
        fileData.focus();    
        fileData.select();
   }
}     

澳门葡京备用网址 11😉

  可以行使文件File API选拔图片文件

澳门葡京备用网址 12😉

//点击事件替代
targetArea.onclick = function(){file1.click();}
//控件选中
file1.onchange = function(){
    var file = file1.files[0];
    base64(file);    
}

澳门葡京备用网址 13😉

  当然也能够使用原生拖拽,达成图片拖拽,在某些区域显示Base6四编码的效应

澳门葡京备用网址 14😉

targetArea.ondragenter = function(e){this.style.outline = "1px solid black";}
targetArea.ondragleave = function(e){this.style.outline = "";}
//拖拽选中
targetArea.ondrop = function(e){
    e = e || event;
    this.style.outline = "";
    var file = e.dataTransfer.files[0];
    base64(file);
}

澳门葡京备用网址 15😉

  由于File API的包容性限制,以下代码在IE玖-浏览器中不可能符合规律运作

澳门葡京备用网址 16😉

<input id="file1" type="file" accept="image/gif,image/jpeg,image/jpg,image/png,image/x-icon"  style="display:none">
<div id="targetArea" style="display:inline-block;vertical-align:middle;height:100px;line-height:50px;width:210px;background:lightblue;">将图片文件拖放到该区域内<br>或者点击该区域选择本地文件</div>
<textarea id="fileData" style="vertical-align:middle;width:400px;height:200px;overflow:auto;word-wrap: break-word;"></textarea>
<button id="btn" style="display:none;position:absolute;margin:220px 0 0 -80px">全选代码</button>
<script>
//base64转换函数
function base64(file){
    if(fileData.innerHTML){
        fileData.innerHTML = '';
        btn.style.display = 'none';
    }
    if(file){
        if(/image/.test(file.type)){
          var reader = new FileReader();
          reader.readAsDataURL(file);
          reader.onload = function(){
              fileData.innerHTML = reader.result;
              btn.style.display = 'inline-block';
              btn.onclick = function(){
                  fileData.focus();    
                  fileData.select();
             }
          }          
        }else{
          alert("You must select a valid image file!");
        }
    }    
}
//点击事件替代
targetArea.onclick = function(){file1.click();}
//控件选中
file1.onchange = function(){
    var file = file1.files[0];
    base64(file);    
}
//兼容事件处理程序
function addEvent(target,type,handler){
    if(target.addEventListener){
        target.addEventListener(type,handler,false);
    }else{
        target.attachEvent('on'+type,function(event){
            return handler.call(target,event);
        });
    }
}
//兼容阻止默认事件
function preventDefault(e){
    e = e || event;
    if(e.preventDefault){
        e.preventDefault();
    }else{
        e.returnValue = false;
    }
}
addEvent(document,'dragover',preventDefault);
addEvent(document,'drop',preventDefault);
addEvent(targetArea,'dragenter',preventDefault);
addEvent(targetArea,'dragover',preventDefault);
addEvent(targetArea,'dragleave',preventDefault);
addEvent(targetArea,'drop',preventDefault);
targetArea.ondragenter = function(e){this.style.outline = "1px solid black";}
targetArea.ondragleave = function(e){this.style.outline = "";}
//拖拽选中
targetArea.ondrop = function(e){
    e = e || event;
    this.style.outline = "";
    var file = e.dataTransfer.files[0];
    base64(file);
}
</script>  

澳门葡京备用网址 17😉

 

 

出处:

于是乎想到对ActiveX再次回到的Base6四字符串进行编码操作

于是想到对ActiveX重返的Base6四字符串进行编码操作

base64 = System.Web.HttpUtility.HtmlEncode(base64);

MemoryStream stream = new MemoryStream(Convert.FromBase64String(base64));
base64 = System.Web.HttpUtility.HtmlEncode(base64);

MemoryStream stream = new MemoryStream(Convert.FromBase64String(base64));

运营程序,报“输入的不是有效的 Base-6四 字符串,因为它包罗非 Base-6肆字符、几个以上的填充字符,可能填充字符间蕴含违规字符”错误。

运作程序,报“输入的不是实惠的 Base-6肆 字符串,因为它蕴涵非 Base-6四字符、几个以上的填充字符,也许填充字符间包括违法字符”错误。

末尾消除方案:

最终化解方案:

对Base6四字符串实行特殊字符替换,并开展PadRight操作,化解难题

对Base64字符串实行特殊字符替换,并进行PadRight操作,消除难点

string dummyData = base64.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
if (dummyData.Length % 4 > 0)
{
    dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
}
MemoryStream stream = new MemoryStream(Convert.FromBase64String(dummyData));
string dummyData = base64.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
if (dummyData.Length % 4 > 0)
{
    dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
}
MemoryStream stream = new MemoryStream(Convert.FromBase64String(dummyData));

最后提供一下包装的Base6四Helper类,提供Base6四字符串与公事之间相互转换操作。

末段提供一下装进的Base6四Helper类,提供Base6肆字符串与公事之间相互转换操作。

/// <summary>
    /// Base64编码字符串与文件转换帮助泪
    /// </summary>
    public class Base64Helper
    {
        /// <summary>
        /// Base64编码字符串转文件
        /// </summary>
        /// <param name="base64">Base64编码字符串</param>
        /// <param name="filename">文件完整路径</param>
        public static void ConvertBase64ToFile(string base64, string filename)
        {
            //base64 = "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";
            string dummyData = base64.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
            if (dummyData.Length % 4 > 0)
            {
                dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
            }
            MemoryStream stream = new MemoryStream(Convert.FromBase64String(dummyData));
            //filename = @"C:\Users\admin\Desktop\Tongji\test.jpg";
            Bitmap img = new Bitmap(stream);
            img.Save(filename);
        }

        /// <summary>
        /// 文件转Base64编码字符串
        /// </summary>
        /// <param name="fileName">文件完整路径</param>
        /// <returns></returns>
        public static string ConvertFileToBase64(string fileName)
        {
            //fileName = @"C:\Users\admin\Desktop\Tongji\test.jpg";
            FileStream fs = File.OpenRead(fileName);
            BinaryReader br = new BinaryReader(fs);
            byte[] bt = br.ReadBytes(Convert.ToInt32(fs.Length));
            string base64String = Convert.ToBase64String(bt);
            return base64String;
        }
    }
/// <summary>
    /// Base64编码字符串与文件转换帮助泪
    /// </summary>
    public class Base64Helper
    {
        /// <summary>
        /// Base64编码字符串转文件
        /// </summary>
        /// <param name="base64">Base64编码字符串</param>
        /// <param name="filename">文件完整路径</param>
        public static void ConvertBase64ToFile(string base64, string filename)
        {
            //base64 = "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";
            string dummyData = base64.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
            if (dummyData.Length % 4 > 0)
            {
                dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
            }
            MemoryStream stream = new MemoryStream(Convert.FromBase64String(dummyData));
            //filename = @"C:\Users\admin\Desktop\Tongji\test.jpg";
            Bitmap img = new Bitmap(stream);
            img.Save(filename);
        }

        /// <summary>
        /// 文件转Base64编码字符串
        /// </summary>
        /// <param name="fileName">文件完整路径</param>
        /// <returns></returns>
        public static string ConvertFileToBase64(string fileName)
        {
            //fileName = @"C:\Users\admin\Desktop\Tongji\test.jpg";
            FileStream fs = File.OpenRead(fileName);
            BinaryReader br = new BinaryReader(fs);
            byte[] bt = br.ReadBytes(Convert.ToInt32(fs.Length));
            string base64String = Convert.ToBase64String(bt);
            return base64String;
        }
    }

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