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How can I use optional parameters in a T-SQL stored procedure?
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Dynamically changing searches based on the given parameters is a complicated subject and doing it one way over another, even with only a very slight difference, can have massive performance implications. The key is to use an index, ignore compact code, i...
Use basic authentication with jQuery and Ajax
...ion (xhr) { xhr.setRequestHeader(“Authorization”, “Basic ” + encodeBase64 (“username:password”) );}, succes: function(val) { //alert(val); alert("Thanks for your comment!"); } }); `
– Patrioticcow
Mar 31 '11 at 23:07
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How do you determine the size of a file in C?
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Based on NilObject's code:
#include <sys/stat.h>
#include <sys/types.h>
off_t fsize(const char *filename) {
struct stat st;
if (stat(filename, &st) == 0)
return st.st_size;
return -1; ...
Create thumbnail image
...;
break;
}
return flipType;
}
//== convert image to base64
public string convertImageToBase64(Image image)
{
using (MemoryStream ms = new MemoryStream())
{
//convert the image to byte array
image.Save(ms, ImageFormat.Jpeg);
byte[] bin = ms.ToArr...
Maximum Java heap size of a 32-bit JVM on a 64-bit OS
..." + (freeMem/megs) + " MiB)");
}
}
This will report the "Max Memory" based upon default heap allocation. So you still would need to play with -Xmx (on HotSpot). I found that running on Windows 7 Enterprise 64-bit, my 32-bit HotSpot JVM can allocate up to 1577MiB:
[C:scratch]> java -Xmx16...
Is the size of C “int” 2 bytes or 4 bytes?
...ote that the standard encourages us to consider choosing our integer types based on range rather than size, but for now let's ignore the standard practice, and let our curiosity explore sizeof, bytes and CHAR_BIT, and integer representation... let's burrow down the rabbit hole and see it for ourselv...
Hash String via SHA-256 in Java
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@Sajjad Use your favorite base64 encoding function. I like the one in Apache Commons personally.
– Brendan Long
Oct 22 '13 at 19:34
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how to check the dtype of a column in python pandas
...select_dtypes('bool'). It may be used even for selecting groups of columns based on dtype:
test = pd.DataFrame({'bool' :[False, True], 'int64':[-1,2], 'int32':[-1,2],'float': [-2.5, 3.4],
'compl':np.array([1-1j, 5]),
'dt' :[pd.Timestamp('2013-01-02'), pd....
How to use http.client in Node.js if there is basic authorization
...c in this case and the username:password combination which gets encoded in Base64:
var username = 'Test';
var password = '123';
var auth = 'Basic ' + Buffer.from(username + ':' + password).toString('base64');
// new Buffer() is deprecated from v6
// auth is: 'Basic VGVzdDoxMjM='
var header = {'Ho...
Rounding up to next power of 2
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Check the Bit Twiddling Hacks. You need to get the base 2 logarithm, then add 1 to that. Example for a 32-bit value:
Round up to the next highest power of 2
unsigned int v; // compute the next highest power of 2 of 32-bit v
v--;
v |= v >> 1;
v |= v >> 2;
v ...