decode

Swift base64 decoding returns nil

由 佐手、 提交于 2020-01-10 13:07:10
问题 I am trying to decode a base64 string to an image in Swift using the following code: let decodedData=NSData(base64EncodedString: encodedImageData, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters) Unfortunately, the variable decodedData turns out to have a value of nil Debugging through the code, I verified that the variable encodedImageData is not nil and is the correct encoded image data(verified by using an online base64 to image converter). What could possibly be the reason

Invert pixels - zxing

由 百般思念 提交于 2020-01-10 03:14:10
问题 I'm using a zxing library in my iOS project. It's a library for reading and creating QR Codes. From my researching and browsing around the web the process of decoding the image is made of this steps: takes an image from source, converts all the pixels to 255 grayscale decodes the data One thing which is not supported by this specific library is reading/decoding (and I'm pretty sure that this is missing in creating also) of inverted QRCodes. Inverted QR Codes are basicly the same as normal

How to decode PostgreSQL bytea column hex to int16/uint16 in r?

由 心已入冬 提交于 2020-01-09 11:53:07
问题 I have some image data stored in a PostgreSQL database table column as bytea. I also have metadata about the data for use in interpreting it, relevant ones being image dimensions and class. Classes include int16, uint16. I cannot find any information on interpreting signed/unsigned ints correctly in R. I am using RPostgreSQL to pull the data into R and I want to view the image in R. MWE: # fakeDataQuery <- dbGetQuery(conn, # 'select byteArray, ImageSize, ImageClass from table where id = 1') #

How to decode PostgreSQL bytea column hex to int16/uint16 in r?

由 时光怂恿深爱的人放手 提交于 2020-01-09 11:52:46
问题 I have some image data stored in a PostgreSQL database table column as bytea. I also have metadata about the data for use in interpreting it, relevant ones being image dimensions and class. Classes include int16, uint16. I cannot find any information on interpreting signed/unsigned ints correctly in R. I am using RPostgreSQL to pull the data into R and I want to view the image in R. MWE: # fakeDataQuery <- dbGetQuery(conn, # 'select byteArray, ImageSize, ImageClass from table where id = 1') #

python处理一些乱码的中文文本时decode(&apos;utf-8&apos;)报错的处理

由 会有一股神秘感。 提交于 2020-01-07 05:04:48
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 用python写脚本时，遇到处理中文（乱码的中文）时，用decode('utf-8')会发现始终会报错 >>> txt_from = open('/home/love/ex130705.log') >>> txt_from_iter= iter(txt_from) >>> txt_proc = txt_from_iter.next().decode('utf-8', 'ignore') Traceback (most recent call last): File "/tmp/py4049kjX", line 41, in <module> txt_proc = txt_from_iter.next().decode('utf-8') File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode return codecs.utf_8_decode(input, errors, True) UnicodeDecodeError: 'utf8' codec can't decode bytes in position 84-85: invalid continuation byte 欲处理的原文件中部分显示为乱码： 2013-07-05 04

decode h264 raw stream using mediacodec

由 寵の児 提交于 2020-01-06 07:00:33
问题 I recieve h264 data from server, I want to decode this stream using mediacodec and texture view on android.I got the data from the server , parssing it to get the SPS , the PPS and the video frame data, then I passed this data to the mediacodec , but the function dequeueOutputBuffer(info, 100000) always returns -1 and I get dequeueOutputBuffer timed out. Any help please, I'am stucked at this issues from three weeks. this is the code used to decode the video frame. public class

Python3: Decode UTF-8 bytes converted as string

由 ☆樱花仙子☆ 提交于 2020-01-06 05:06:22
问题 Suppose I have something like: a = "Gżegżółka" a = bytes(a, 'utf-8') a = str(a) which returns string in form: b'G\xc5\xbceg\xc5\xbc\xc3\xb3\xc5\x82ka' Now it's send as simple string (I get it as assertion from eval function). How the heck can I now get normal UTF-8 form of starting word? If there is some better compression than str(bytes(x)) then I would be glad to hear. 回答1: If you want to encode and decode text, that's what the encode and decode methods are for: >>> a = "Gżegżółka" >>> b =

python: Invalid base64-encoded string: number of data characters (5) cannot be 1 more than a multiple of 4

由 ╄→尐↘猪︶ㄣ 提交于 2020-01-06 03:23:05
问题 output the following error: Exception Value: Invalid base64-encoded string: number of data characters (5) cannot be 1 more than a multiple of 4 Exception Location: D:\Program Files\Python\lib\base64.py in b64decode, line 87 " I input python like this : key = hashlib.md5("exit_care".encode("ascii")).hexdigest().encode("ascii") key_64 = base64.urlsafe_b64decode(key) cipher_suite = Fernet(key_64) 回答1: Assuming you're using the Fernet class provided by the cryptography python package, you need to

oracle undo表空间爆满处理

由 ▼魔方 西西 提交于 2020-01-05 22:46:15
undo 表空间使用案例分析（UNDOTBS1使用率100%，enq：US-contention,释放undo） 转载 2013年02月20日 16:04:29 12007 问题描述： 近几天发现Oracle10.2.0.4数据库undo tablespace表空间使用率很高（最高时达到100%），报警系统频繁报障undo tablespace表空间使用率过高。 TABLESPACE_NAME TOTAL USED FREE PUSED PFREE UNDOTBS1 6141 % % 查询所有表空间使用情况（今天发现自己创建的表空间在使用完的情况，这个查询语句或者其它查询语句查不出已经使用完的表空间，只能自己删除掉一些使用该表空间的用户，以便释放自己创建的表空间） SELECT UPPER(F.TABLESPACE_NAME) "表空间名", 　　D.TOT_GROOTTE_MB "表空间大小(M)", 　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)", 　　TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB 100,2),'990.99') || '%' "使用比", 　　F.TOTAL_BYTES "空闲空间(M)", 　　F.MAX_BYTES

Decode JSON to PHP

由 五迷三道 提交于 2020-01-05 17:20:32
问题 I have a .txt file called 'test.txt' that is a JSON array like this: [{"email":"chrono@gmail.com","createdate":"2016-03-23","source":"email"}] I'm trying to use PHP to decode this JSON array so I can send my information over to my e-mail database for capture. I've created a PHP file with this code: <?php $url = 'http://www.test.com/sweeps/test.txt'; $content = file_get_contents($url); $json = json_decode($content,true); echo $json; ?> For some reason, it's not echoing the decoded JSON when I
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