blob

I'm working on a simple multimedia messaging app for Android, and I was trying to use Google AppEngine's BlobStore as my cloud storage for the various image, video, and audio files that will be transferred. However, all of the examples and such that I've seen for uploading to blobstore assume that I'm doing it via an HTTP form, and so I'm kind of at a loss as to what to do. I've seen several people asking the same question, but none of them seem to ever get a satisfactory answer. Can I or should I use AppEngine's blobstore in this way, and if so how do I go about doing it? Thanks, SO.

I'm generating a file client-side, I have the data in hexadecimal and just want to let the user download the generated file. var blob = new Blob([hexData], {type: "application/octet-stream"}); console.log(URL.createObjectURL(blob)); The resulting file is a plain-text file containing hex data in ASCII. How can I force the Blob to contain the binary data as is and not as text? Convert you data to a binary array then create a blob from that. var byteArray = new Uint8Array(hexdata.length/2); for (var x = 0; x < byteArray.length; x++){ byteArray[x] = parseInt(hexdata.substr(x*2,2), 16); } var blob

I need to add jpeg images to firestore db records. My preferred way would be in a Blob as I have used in Sqlite records. I have run into some problems in trying this. The following is my best try so far: public Blob getImage() { Uri uri = Uri.fromFile(new File(mCurrentPhotoPath)); File f1 = new File(mCurrentPhotoPath); URL myURL = null; try { myURL = f1.toURI().toURL(); } catch (MalformedURLException e) { e.printStackTrace(); } Bitmap bitmap = null; BitmapFactory.Options options = new BitmapFactory.Options(); options.inPreferredConfig = Bitmap.Config.ARGB_8888; try { if (myURL != null) {

It is in a shared host and I access with Navicat. I have field with BLOB and I want to convert it into VARCHAR. I've tried in the design screen but everything was lost. I backed up. Luis Nuesi Tejada try using this, I found it some time ago, you can convert it to char , not to Varchar2 or Varchar , haven't test it yet. Try: CAST(a.ar_options AS CHAR(10000) CHARACTER SET utf8) MySQL treat data unique. Hence there is a difference between Blob and Text. Text simply means a text string stored as original, not in binary, whereas a blob is a text string stored as a binary. ilhan try with the below

download & excel & blob Blob https://developer.mozilla.org/en-US/docs/Web/API/Blob FileReader https://developer.mozilla.org/en-US/docs/Web/API/FileReader download & excel backend auto download A response triggering the "Save As" dialog: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition#Examples Content-Type: text/html; charset=utf-8 Content-Disposition: attachment; filename="cool.html" Content-Length: 22 excel & content-type type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", Excel & Content-Type const File = { name: "test.xlsx", lastModified:

最近遇到一个需求，需要将页面中的配置信息下载下来供用户方便使用，以前这个场景的需求有时候会放到后端处理，然后给返回一个下载链接。其实并不需要这么麻烦，这样既增大了服务器的负载，也让用户产生了没有必要的网络请求，现在前端也是可以直接通过 Blob 对象进行前端文件下载了，下面简单记录下相关实现 Blob对象简要介绍 Blob 对象表示一个不可变、原始数据的类文件对象。 Blob 表示的不一定是 JavaScript 原生格式的数据。 File 接口基于 Blob ，继承了 Blob 的功能并将其扩展使其支持用户系统上的文件。 语法 const aBlob = new Blob( array, options ); 参数说明 array 是一个由ArrayBuffer, ArrayBufferView, Blob, DOMString 等对象构成的 Array ，或者其他类似对象的混合体，它将会被放进 Blob。DOMStrings会被编码为UTF-8。 options 是一个可选的BlobPropertyBag字典，它可能会指定如下两个属性： type，默认值为 ""，它代表了将会被放入到blob中的数组内容的MIME类型。 endings，默认值为"transparent"，用于指定包含行结束符\n的字符串如何被写入。 它是以下两个值中的一个： "native"

I have a requirement to store user uploaded files to the database (filesystem is not an option). The files that are uploaded are different types (e.g. PDF, EXCEL, etc). I have a problem on deciding whether or not to use MEDIUMBLOB as type to store these files as binary data. And the confusion arises due to the fact that the size of these files vary with huge difference. Like some of the files are a few hundred KiloBytes (e.g. 114 KB) but some others are upto 1.5 MegaBytes. So I really need to use MEDIUMBLOB as the column type. But I have little confusion as the actually memory taken up depends