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Convert integer into byte array (Java)
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Have a look at the ByteBuffer class.
ByteBuffer b = ByteBuffer.allocate(4);
//b.order(ByteOrder.BIG_ENDIAN); // optional, the initial order of a byte buffer is always BIG_ENDIAN.
b.putInt(0xAABBCCDD);
byte[] result = b.array();
Setting the byte order ensures that result[0] == 0xAA, re...
Programmatically align a toolbar on top of the iPhone keyboard
...ther with a "done" button on the right:
UIToolbar *toolbar = [[[UIToolbar alloc] init] autorelease];
[toolbar setBarStyle:UIBarStyleBlackTranslucent];
[toolbar sizeToFit];
UIBarButtonItem *flexButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:s...
strdup() - what does it do in C?
...e as the following code:
char *strdup(const char *src) {
char *dst = malloc(strlen (src) + 1); // Space for length plus nul
if (dst == NULL) return NULL; // No memory
strcpy(dst, src); // Copy the characters
return dst; // Re...
Add UIPickerView & a Button in Action sheet - How?
...segmented control (eyecandy)
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil
delegate:nil
cancelButtonTitle:nil
destruct...
Formatting NSDate into particular styles for both year, month, day, and hour, minute, seconds
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this is what i used:
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd"];
NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:@"HH:mm:ss"];
NSDate *now = [[NSDate alloc] init];
NSString *theDate = [dateFo...
What is meant by Resource Acquisition is Initialization (RAII)?
...object.
** Update2: as @sbi pointed out, the resource - although often is allocated inside the constructor - may also be allocated outside and passed in as a parameter.
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In C++, is it still bad practice to return a vector from a function?
...end(), sum2);
}
In the first example, there are many unnecessary dynamic allocations/deallocations happening, which are prevented in the second example by using an output parameter the old way, reusing already allocated memory. Whether or not this optimization is worth doing depends on the relativ...
Does delete on a pointer to a subclass call the base class destructor?
I have an class A which uses a heap memory allocation for one of its fields. Class A is instantiated and stored as a pointer field in another class ( class B .
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Most lightweight way to create a random string and a random hexadecimal number
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Is this random/unique enough to be used in, say, session tokens?
– moraes
Jul 4 '11 at 12:31
1
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MySQL high CPU usage [closed]
...db_buffer_pool_size (if you're using innodb tables) as all of these memory allocations can have an affect on query performance which can cause MySQL to eat up CPU.
You'll also probably want to give the following a read over as they contain some good information.
How MySQL Uses Memory
MySQL System...