hex

How to get raw jpeg data (but no metatags / proprietary markers)

由 偶尔善良 提交于 2021-02-11 13:03:09
问题 I want to get raw jpeg data - no metadata. I'm very confused looking at the jpeg "standards". How correct is my understanding of the marker "tree"? 0xFFD8 - Identifies the file as an image 0xFFE? - EXIF, JFIF, SPIFF, ICC, etc 0x???? - the length of the tag 0xFFD8 - Start of Image 0xFFE0 - should follow SOI as per spec, but often preceded by comments ??? 0x???? - Matrices, tags, random data ??? There are never other markers in-between these markers? Or these include the matrices and such?

如果没有<form>标签，也没有enctype="multipart/form-data"属性，怎么使用formData对象提交表单呢？如下方式

由 99封情书 提交于 2021-02-10 17:45:23
form标签的enctype属性 enctype 属性规定在发送到服务器之前应该如何对表单数据进行编码。 默认地，表单数据会编码为 "application/x-www-form-urlencoded"。就是说，在发送到服务器之前，所有字符都会进行编码（空格转换为 "+" 加号，特殊符号转换为 ASCII HEX 值）。 如果没使用form表单，用了new Fromdata(),需要enctype属性设置，可以在ajax上设置如下 cache: false ,//不需要缓存 processData: false ,//不需要对数据处理 contentType: false var formData = new FormData(); formData.append( ' name ' , $( ' #name ' ).val()); formData.append( ' file ' , $( ' #file ' )[ 0 ].files[ 0 ]); $.ajax({ url: '' , type: ' POST ' , data: formData, cache: false , processData: false , contentType: false }).done(function(res) { }).fail(function(res) {}); 来源：

SQL Server 2008 saves geography point as hex

由 蹲街弑〆低调 提交于 2021-02-10 05:12:59
问题 I've recorded my track to a text file and now I'd like to insert it into SQL Server 2008 R2 database's table as a Point type. I read my text file using OpenRowSet and insert each line into temporary table. Then I parse every row and insert right values to real table. Each row in file looks like: $GPRMC,101142.415,A,6210.1547,N,02929.2220,E,3.9,231.8,150310,,,A*62 I'm parsing latitude and longitude with such a code: INSERT INTO Track(Point) SELECT geography::Point( SUBSTRING(entry,21,2)+'.'

SQL Server 2008 saves geography point as hex

由 荒凉一梦 提交于 2021-02-10 05:12:01
问题 I've recorded my track to a text file and now I'd like to insert it into SQL Server 2008 R2 database's table as a Point type. I read my text file using OpenRowSet and insert each line into temporary table. Then I parse every row and insert right values to real table. Each row in file looks like: $GPRMC,101142.415,A,6210.1547,N,02929.2220,E,3.9,231.8,150310,,,A*62 I'm parsing latitude and longitude with such a code: INSERT INTO Track(Point) SELECT geography::Point( SUBSTRING(entry,21,2)+'.'

MySQL函数大全及用法

由 僤鯓⒐⒋嵵緔 提交于 2021-02-09 13:54:44
1、字符串函数 ascii(str) 返回字符串str的第一个字符的ascii值(str是空串时返回0) mysql> select ascii('2'); 　　-> 50 mysql> select ascii(2); 　　-> 50 mysql> select ascii('dete'); 　　-> 100 ord(str) 如果字符串str句首是单字节返回与ascii()函数返回的相同值。 如果是一个多字节字符,以格式返回((first byte ascii code)*256+(second byte ascii code))[*256+third byte asciicode...] mysql> select ord('2'); 　　-> 50 conv(n,from_base,to_base) 对数字n进制转换,并转换为字串返回(任何参数为null时返回null,进制范围为2-36进制,当to_base是负数时n作为有符号数否则作无符号数,conv以64位点精度工作) mysql> select conv("a",16,2); 　　-> '1010' mysql> select conv("6e",18,8); 　　-> '172' mysql> select conv(-17,10,-18); 　　-> '-h' mysql> select conv(10+"10"

SQL: Convert an integer into a hex string?

由 走远了吗. 提交于 2021-02-08 14:01:30
问题 How do you convert an integer into a string of hex? I want to convert the int into a format that I can use as a color on my page for example '#ff0000'. So for example: --This converts my int to hex: CONVERT(VARBINARY(8), Color) Color, And I want to do something like this: '#' + CONVERT(NVARCHAR(10), CONVERT(VARBINARY(8), Color)) Color But converting a varbinary string just converts it to an ascii character rather than returning the actual hex string 回答1: There is a built in function to

Conversion of long Hex string to Integer not working as expected (works in SQL)

由 心已入冬 提交于 2021-02-08 10:50:50
问题 I have the need to convert a hex string into an integer using C#. I've tried all of the suggestions on SO including this one and many others. All of them throw the same or roughly the same... error. Value was either too large or too small for an Int32 (same for Int64 ). I can get the desired result in SQL Server 2008 with the following code: select convert(int, 0x1B1D3E1B22176145272C1631282D221D30) However THIS C# code Int64.Parse("1B1D3E1B22176145272C1631282D221D30", NumberStyles.HexNumber)

Conversion of long Hex string to Integer not working as expected (works in SQL)

由 萝らか妹 提交于 2021-02-08 10:50:47
问题 I have the need to convert a hex string into an integer using C#. I've tried all of the suggestions on SO including this one and many others. All of them throw the same or roughly the same... error. Value was either too large or too small for an Int32 (same for Int64 ). I can get the desired result in SQL Server 2008 with the following code: select convert(int, 0x1B1D3E1B22176145272C1631282D221D30) However THIS C# code Int64.Parse("1B1D3E1B22176145272C1631282D221D30", NumberStyles.HexNumber)

Create hex-representation of signed int in PHP

由 眉间皱痕 提交于 2021-02-08 10:18:31
问题 I'm parsing a binary and stumbled upon some 16bit (2 byte) values that I need to convert from hex to dec and vice versa. Positive values look like this "0075" (117) while negative ones look like that "FE75" (-395). I'm using this function to convert from hex to signed int, which works, but I can't seem to find a solution for signed int to hex-representation. function hexdecs($hex) { // ignore non hex characters $hex = preg_replace('/[^0-9A-Fa-f]/', '', $hex); // converted decimal value: $dec

Explanation on Integer to Array

由 家住魔仙堡 提交于 2021-02-08 08:40:22
问题 Please Help I know that you are reading this, and I would appreciate a comment if do not have an answer because I feel that I am alone in trying to figure this out. How Does this Work? I have thoroughly read this document. It mentions an element called TimestampScale. I have downloaded probably thirty WebM example files and seen that the values following the HEX { 0x2AD7B1 or 2A D7 B1 or ['2A','D7','B1'] } or NON-HEX integers { 42 215 177 or [42, 215, 177] } are always the same: HEX {
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