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Convert a bitmap into a byte array
...an code. The simplest way is to pin the array: GCHandle handle = GCHandle.Alloc(bufferarray, GCHandleType.Pinned); get the pointer to the array IntPtr iptr = Marshal.UnsafeAddrOfPinnedArrayElement(bufferarray, 0); then create a new bitmap using the IntPtr: bitmap = new Bitmap(width, height, (width ...
Read entire file in Scala?
...than other patterns (e.g. getLines().mkString("\n")) due to more efficient allocation patterns.
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list.clear() vs list = new ArrayList(); [duplicate]
... one way holds onto memory, the other one throws out its memory and gets reallocated from scratch (with the default capacity). Which is better depends on whether you want to reduce garbage-collection churn or minimize the current amount of unused memory. Whether the list sticks around long enough to...
Large, persistent DataFrame in pandas
...(here's a tedious one: you could transcribe the file row-by-row into a pre-allocated NumPy array or memory-mapped file--np.mmap), but it's one I'll be working on in the near future. Another solution is to read the file in smaller pieces (use iterator=True, chunksize=1000) then concatenate then with ...
Keystore type: which one to use?
...S11, for PKCS#11 libraries, typically for accessing hardware cryptographic tokens, but the Sun provider implementation also supports NSS stores (from Mozilla) through this.
BKS, using the BouncyCastle provider (commonly used for Android).
Windows-MY/Windows-ROOT, if you want to access the Windows ce...
How to access maven.build.timestamp for resource filtering
...lt;/resources>
</build>
When packaging, Maven will replace any token timestamp in /resources folder, e.g. resources/version.properties :
build.timestamp=${timestamp}
You can then load this properties file in your Application.
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How to display nodejs raw Buffer data as Hex string
... is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead. So now it should be Buffer.from( buf.toString('hex'),'hex');
– flob
Mar 12 '19 at 12:47
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Move assignment operator and `if (this != &rhs)`
...ll you need to do is a memcpy (hidden under std::copy). You don't want to allocate a new array of the same size and then deallocate the old one of the same size!
Now for your clients who actually want strong exception safety:
template <class C>
C&
strong_assign(C& lhs, C rhs)
{
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When should I create a destructor?
...en would the fourth field initializer run? Never. But the object is still allocated and must be finalized. Heck, you don't even have a guarantee that fields of type double were fully initialized when the dtor runs. There could have been a thread abort halfway through writing the double and now the ...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
... of the inserted record from the trigger.
IdentCurrent: The last identity allocated for the table.
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