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JavaScript: how to Download CSV file containing French text with UTF-8 encoding

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问题 I am trying to download CVS file using JavaScript. That CSV contains text in French language. I am creating file using blob var blob = new Blob([ csv ], { type : 'text/csv;charset=utf-8' }); var csvUrl = window.URL.createObjectURL(blob); But when i open the csv file it shows the content in ANSII format due to which French characters are converted to some unknown characters. But if i open the same file as text, the encoding is ok (UTF-8). Example: Text I am trying to download "Opération" Text

Halcon实现边缘提取

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一、边缘提取 1、设置ROI兴趣区域 2、快速二值化，并连接相邻区域。这样做的目的是进一步减少目标区域，通过二值化将目标区域大概轮廓提取出来 3、提取最接近目标区域的轮廓常用函数有boundary，gen_contour_region_xld 4、根据自己的需求提取需要的初步轮廓 5、将初步提取的初步轮廓进行膨胀操作 6、将膨胀后的区域和原图进行减操作（在这步之前有可能需要对原图进行高斯滤波）。这样就能得到只有边缘的真实图像 7、用canny或其他算子（根据需要）提取亚像素轮廓，一般使用edges_sub_pix函数 8、处理和计算得到真实的边缘XLD后你可能需要进一步处理得到你想要的线、弧等。你可能用到的函数segment_contours_xld（分割） union_collinear_contours_xld（联合相邻或相同角度直线）select_contours_xld（提取想要的轮廓） union_cocircular_contours_xld（联合相同圆）等等得到轮廓后如果你不知道怎么处理后得到你想要的东西（线、弧、圆、角、矩形）你都可以将轮廓转化为点，然后用点集合来拟合任何你想要的东西。二、BLOB分析检测（前面一篇有详细讲解，本骗只讲思路）（1）应用ROI，可以使Blob分析加速。（2）匹配ROI区域或图像

MySQL_的数据类型

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目录整型浮点型定点数类型日期时间型字符型 M为最大值，D为精度值整型数据类型存储范围字节 tinyint 有符号值：-128到127（-2 7 到2 7 -1）无符号值：0到255（0到2 8 -1） 1 smallint 有符号值：-32768到32767（-2 15 到2 15 >-1）无符号值：0到65535（0到2 16 -1） 2 mediuming 有符号值：-8388608到8288607（-2 23 到2 23 -1）无符号值：0到16777215（0到2 24 -1） 3 int 有符号值：-2147483648到2147483647（-2 31 到2 31 -1）无符号值：0到4294967295（0到2 32 -1） 4 bigint 有符号值：-9223372036854775808到9223373036854775807（-2 63 到2 63 -1）无符号值：0到18446744073709551615（0到2 64 -1） 8 浮点型数据类型存储范围字节 float[(M,D)] 有符号值：-3.402823466e+38到-1.175494351e38 无符号值：0到1.175494351e-38到3.402823466e+38 4 double[(M,D)] 有符号值：-1.797693134862315+308到

How to release blobs with hibernate and spring @transactional?

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问题 I have a project with Spring and Hibernate. In my implementation, there are multiple models where I have to read from a file and store it as a Blob. For this purpose, I have an abstract class defined with Blob as follows. All the model that need to store blobs extend this class. @MappedSuperclass public abstract class AbstractContentAwareBean { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id") protected Long id; public AbstractContentAwareBean() {} @Lob @Column(name

Upload files using cakephp 3 and store it in a blob

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问题 I know that storing files in database is a little dirty, but I'm need to upload and store a file into a database BLOB and I haven't found any documentation about it and I haven't find any clue, so any help about it will be appreciated. Thanks in advance, David 回答1: There is nothing special that you'd need to do, simply set the data that you want to store in the appropriate entity property (respectively array key), either as a string, or as a stream. BLOB columns will automatically be

How to represent an image from database in JSON

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问题 I need to create JSON based on a blob from database. To get the blob image, I use the code below and after show in json array: Statement s = connection.createStatement(); ResultSet r = s.executeQuery("select image from images"); while (r.next()) { JSONObject obj = new JSONObject(); obj.put("img", r.getBlob("image")); } I to want return a JSON object for the each image according the image blob. How can I achieve it? 回答1: Binary data in JSON is usually best to be represented in a Base64-encoded

Retrieving BLOB from SQLite database android

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问题 I have a database with some images inside, saved as BLOB. I didn't have any problem with the database until now, I try to retrieve the BLOB as I would do with any other data but it's not working: Cursor c = mDb.query(" ... "); c.moveToFirst(); ByteArrayInputStream inputStream = new ByteArrayInputStream(c.getBlob(0)); Bitmap b = BitmapFactory.decodeStream(inputStream); The problem is that I get an exception when the program is trying to get the information of "c.getBlob(0)". It's also not

Streaming and Linq Blobs

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问题 I have an object I am using to store document meta data into a table. The body text of the document can be very large, sometimes > 2GB so I will be storing it into a nvarchar(max) field in SQL 2008. I'll use SQL 2008 later to index that field. I won't be using filestreams because they are very restrictive to the database and prevents certain types of concurrency locking schemes. This object is exposed to the developer via LinqToSQL. My concern is that the field will be to large and I have

Store file on file system or as varbinary(MAX) in SQL Server

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问题 I understand that there is a lot of controversy over whether it is bad practice to store files as blob's in a database, but I just want to understand whether this would make sense in my case. I am creating an ASP.NET application, used internally at a large company, where the users needs to be able to attach files to a 'job' in the system. These files are generally PDF's or Word documents, probably never exceeding a couple of mb. I am creating a new table like so: ID (int) JobID (int)

How do I index rich-format documents contained as database BLOBs with Solr 4.0+?

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问题 I've found a few related solutions to this problem. The related solutions will not work for me as I'll explain. (I'm using Solr 4.0 and indexing data stored in an Oracle 11g database.) Jonck van der Kogel's related solution (from 2009) is explained here. He describes creating a custom Transformer, sort of like the ClobTransformer that ships with Solr. This is going down the elegant path but is not using Tika which is now integrated with Solr. (He uses external PDFBox and FontBox.) This