blob

I'm trying to implement a PDF file download functionality with JavaScript. As a response to a POST request I get a PDF file, in Chrome DevTools console it looks like (the oResult data container, fragment): "%PDF-1.4↵%����↵4 0 obj↵<>stream↵x�� Now I'm trying to initialize the download process: let blob = new Blob([oResult], {type: "application/pdf"}); let link = document.createElement('a'); link.href = window.URL.createObjectURL(blob); link.download = "tstPDF"; link.click(); As a result, upon a click on a button I get tstPDF.pdf , it contains the correct number of pages, but the PDF itself is

I have a django app (from which I get some html as a client), and a base64-encoded PDF which needs to be displayed. I've tried multiple approaches, which work as expected in Chrome/Firefox. I'm working with django, so there will be some templates and some JavaScript. pdf_preview_embed is a div Embed DataURL <embed width=100% height=100% type="application/pdf" src="data:application/pdf;base64, {{ pdf }}"></embed> Unacceptable solution, because it may require inlining megs of data. Works in IE11 under Windows 7, doesn't work on Edge and IE11 under Windows 10. Embed Blob base64binary

//url:文件地址 filename:想要修改为的名称 function download(url, filename) { getBlob(url, function (blob) { saveAs(blob, filename); }); }; function getBlob(url, cb) { var xhr = new XMLHttpRequest(); xhr.open('GET', url, true); xhr.responseType = 'blob'; xhr.onload = function () { if (xhr.status === 200) { cb(xhr.response); } }; xhr.send(); } function saveAs(blob, filename) { if (window.navigator.msSaveOrOpenBlob) { navigator.msSaveBlob(blob, filename); } else { var link = document.createElement('a'); var body = document.querySelector('body'); link.href = window.URL.createObjectURL(blob); link.download =

I have a certain table in mySQL which has a field called "image" with a datatype of "BLOB". I was wondering if it is possible to upload an image in that field directly from the Command Line Client rather than doing it through php...If it is possible, then where exactly should I place my image files? Try using the LOAD_FILE() function. UPDATE `certain_table` SET image = LOAD_FILE('/full/path/to/new/image.jpg') WHERE id = 1234; See the manual for requirements about the path to the filename, privileges, etc. LOAD_FILE works only with certain privileges and if the file is on the server. I've found

I have searched about this matter a lot but, I didn't get a proper solution for my problem, I have following method for storing a file using java, private void uploadFile() throws Exception { Class.forName("com.mysql.jdbc.Driver").newInstance(); connection = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/FileDb?autoReconnect=true", "user1", "123789"); System.out.println("DB connection extablished!"); PreparedStatement statement = connection.prepareStatement("INSERT INTO FilesTb(`FileData`) VAULES(?)"); File file = new File(txtDir.getText() + "/" + txtFile.getText());// get path and

I have identified a random series of bytes inserted into any blob field when the database is manipulated via Adobe AIR. (from my results it appear to always start with bytes[12, ...] but I'm not sure of that) I think it's a sizeinfo of the bytes, let me explain how I came to this conclusion. First my context : I manipulate sqlite databases through Adobe AIR (client-side) and System.data.sqlite (C# server-side) With System.data.sqlite if I read a Sqlite db filled with BLOB by Adobe AIR I have to get ride of those bytes appended in the beginning by AIR and then I have the binary data all well

项目中难免会遇到预览文件或者下载文件的场景，如果后台返回的是base64或者图片格式还好说，文件信息直接放在返回body里，作为对象属性给到前端，很直观，也方便取用。 但后台给到的是文件流就要麻烦一些了，一般来说文件流会直接凡在res.data里 处理这种特殊返回值时需要设置axios的responseType为blob，防止axios内部默认处理返回值，导致无法解析： axios.get({ url: 'xxxxxx', method: 'get', data:{}, responseType: 'blob' }).then(res => { console.log(res); }); 当后台解析错误的时候，返回的就是正常的错误对象，包含错误码和错误信息，如果不做处理，那么错误状态和成功状态都是blob类型，无法捕获 但实际上错误状态是这样的形式： 所以需要对返回值做特殊处理，尝试把blob转换为json格式，如果转换成功则说明返回的数据不是文档流，后台出错，反之则文档转换正常，继续下载或预览： axios.get({ url: 'xxxxxx', method: 'get', data:{}, responseType: 'blob' }).then(res => { let data = res.data; let fileReader = new FileReader();

本文转自: http://www.cnblogs.com/zbseoag/archive/2013/03/19/2970004.html 1、整型 MySQL数据类型 含义（有符号） tinyint(m) 1个字节 范围(-128~127) smallint(m) 2个字节 范围(-32768~32767) mediumint(m) 3个字节 范围(-8388608~8388607) int(m) 4个字节 范围(-2147483648~2147483647) bigint(m) 8个字节 范围(+-9.22*10的18次方) 取值范围如果加了unsigned，则最大值翻倍，如tinyint unsigned的取值范围为(0~256)。 int(m)里的m是表示SELECT查询结果集中的显示宽度，并不影响实际的取值范围，没有影响到显示的宽度，不知道这个m有什么用。 2、浮点型(float和double) MySQL数据类型 含义 float(m,d) 单精度浮点型 8位精度(4字节) m总个数，d小数位 double(m,d) 双精度浮点型 16位精度(8字节) m总个数，d小数位 设一个字段定义为float(5,3)，如果插入一个数123.45678,实际数据库里存的是123.457，但总个数还以实际为准，即6位。 3、定点数 浮点型在数据库中存放的是近似值

In my Firebird database I have a Blob field that contain a Bitmap. I'll have to load and display in a TImage located on my Form. Subsequently I'll have to save in the same field the image selected by a OpenDialog. Procedure LoadBitmapFromBlob(Bitmap: TBitmap; Blob: TBlobField); var ms, ms2: TMemoryStream; begin ms := TMemoryStream.Create; try Blob.SaveToStream(ms); ms.Position := 0; Bitmap.LoadFromStream(ms); finally ms.Free; end; end; example usage procedure TForm4.Button1Click(Sender: TObject); var bmp: TBitmap; begin bmp := TBitmap.Create; try LoadBitmapFromBlob(bmp, TBlobField(Dataset