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print call stack in C or C++
...cktrace(3) that simply returns an array of void * (in fact each of these point to the return address from the corresponding stack frame). To translate these to something of use, there's backtrace_symbols(3).
Pay attention to the notes section in backtrace(3):
The symbol names may be unavailable...
Python way of printing: with 'format' or percent form? [duplicate]
...verflow.com/a/3228928/174728. It also lets you do key/index lookups import sys;"{[version]}".format(vars(sys))
– John La Rooy
Dec 7 '14 at 22:24
2
...
Correct format specifier to print pointer or address?
... p The argument shall be a pointer to void. The value of the pointer is
converted to a sequence of printing characters, in an implementation-defined
manner.
(In C11 — ISO/IEC 9899:2011 — the information is in §7.21.6.1 ¶8.)
On some platforms, that will include a leading 0x and on other...
Cannot drop database because it is currently in use
...E'
DECLARE @SQL varchar(max)
SELECT @SQL = COALESCE(@SQL,'') + 'Kill ' + Convert(varchar, SPId) + ';'
FROM MASTER..SysProcesses
WHERE DBId = DB_ID(@DatabaseName) AND SPId <> @@SPId
--SELECT @SQL
EXEC(@SQL)
share
...
Calculate difference between two dates (number of days)?
... answer is obviously correct, but you can also use (a - b).Days if you are interested in the total days as an int rather than a double with a decimal representation of the partial day difference.
– PFranchise
Dec 11 '12 at 15:27
...
libpng warning: iCCP: known incorrect sRGB profile
...ou can do that with any of a variety of PNG editors such as ImageMagick's
convert in.png out.png
To remove the invalid iCCP chunk from all of the PNG files in a folder (directory), you can use mogrify from ImageMagick:
mogrify *.png
This requires that your ImageMagick was built with libpng16. ...
Most efficient way to check for DBNull and then assign to a variable?
....NET alternative to Stevo3000's suggestion:
oSomeObject.IntMember = If(TryConvert(Of Integer)(oRow("Value")), iDefault)
oSomeObject.StringMember = If(TryCast(oRow("Name"), String), sDefault)
Function TryConvert(Of T As Structure)(ByVal obj As Object) As T?
If TypeOf obj Is T Then
Retur...
Change R default library path using .libPaths in Rprofile.site fails to work
...brary why not append the new library (which must already exist in your filesystem) to the existing library path?
.libPaths( c( .libPaths(), "~/userLibrary") )
Or (and this will make the userLibrary the first place to put new packages):
.libPaths( c( "~/userLibrary" , .libPaths() ) )
Then I ge...
Pure JavaScript Send POST Data Without a Form
...
The [new-ish at the time of writing in 2017] Fetch API is intended to make GET requests easy, but it is able to POST as well.
let data = {element: "barium"};
fetch("/post/data/here", {
method: "POST",
body: JSON.stringify(data)
}).then(res => {
console.log("Request compl...
How do I convert from int to String?
...ou ask for concatenation; 3. as you do not have a string, you will finally convert your int into string. The solution of daridoo avoid the first steps.
– Nicolas
Nov 5 '10 at 14:24
...