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store and retrieve a class object in shared preference
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we can use Outputstream to output our Object to internal memory. And convert to string then save in preference. For example:
mPrefs = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor ed = mPrefs.edit();
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
...
When should you use 'friend' in C++?
...nt this compiler error: error C2440: '<function-style-cast>': cannot convert from 'utils::f::int_type' to 'utils::f' note: No constructor could take the source type, or constructor overload resolution was ambiguous
– Damian
Mar 29 '16 at 7:06
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How to debug a GLSL shader?
...sinf(x)
// undefined otherwise
float significand(float x)
{
// converting int to float so that exp2(genType) gets correctly-typed value
float expo=float(floorLog2(abs(x)));
return abs(x)/exp2(expo);
}
// Input: x\in
Encrypt & Decrypt using PyCrypto AES 256
...se a random, 16-byte IV.
iv = Random.new().read(AES.block_size)
# Convert the IV to a Python integer.
iv_int = int(binascii.hexlify(iv), 16)
# Create a new Counter object with IV = iv_int.
ctr = Counter.new(AES.block_size * 8, initial_value=iv_int)
# Create AES-CTR cipher...
std::cin input with spaces?
...(and tweak accordingly for multi-word input), or use getline and lexically convert to int after-the-fact.
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Obfuscated C Code Contest 2006. Please explain sykes2.c
...amp;8)|i/64]/(i&2?1:8)%8;
putchar(32 | (b & 1));
}
}
Converting the recursion to a loop and sneaking in a bit more simplification:
// please don't pass any command-line arguments
main() {
int i;
for(i=447; i>=0; i--) {
if(i % 64 == 0) {
putchar('...
Google Authenticator implementation in Python
...def Truncate(hmac_sha1):
"""
Truncate represents the function that converts an HMAC-SHA-1
value into an HOTP value as defined in Section 5.3.
http://tools.ietf.org/html/rfc4226#section-5.3
"""
offset = int(hmac_sha1[-1], 16)
binary = int(hmac_sha1[(offset * 2):((offset ...
Android: Getting a file URI from a content URI?
... cover cursor null cases & conversion from content:// to file://
To convert file, read&write the file from gained uri
public static Uri getFilePathFromUri(Uri uri) throws IOException {
String fileName = getFileName(uri);
File file = new File(myContext.getExternalCacheDir(), fileN...
How to use SCNetworkReachability in Swift
I'm trying to convert this code snippet to Swift. I'm struggling on getting off the ground due to some difficulties.
7 An...
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?
...oduces the following compilation error:
Constant value '500500' cannot be converted to a 'char'
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