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If isset $_POST
...bmits to another page. There, it checks if the input mail is filled. If so then do something and if it is not filled, do something else. I don't understand why it always says that it is set, even if I send an empty form. What is missing or wrong?
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cv2.imshow command doesn't work properly in opencv-python
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You must use cv2.waitKey(0) after cv2.imshow("window",img). Only then will it work.
import cv2
img=cv2.imread('C:/Python27/03323_HD.jpg')
cv2.imshow('Window',img)
cv2.waitKey(0)
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Coloring white space in git-diff's output
...ne tune the type of whitespace errors that are highlighted in red, you can then change core.whitespace, but blank-at-eol is enabled by default so you probably won't need to change that for the example you mention.
A possible source of confusion is that in the output of git diff, whitespace errors a...
Java String array: is there a size of method?
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Oh, then what is it? Some special Array thing?
– jjnguy
May 28 '09 at 15:28
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Windows equivalent to UNIX pwd
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This prints it in the console:
echo %cd%
or paste this command in CMD, then you'll have pwd:
(echo @echo off
echo echo ^%cd^%) > C:\WINDOWS\pwd.bat
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Back to previous page with header( “Location: ” ); in PHP
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Say it's a POST form, just put the current location in a hidden field and then use it in the header() Location.
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How to create and use resources in .NET
...d to change the Persistence settings in the properties of the resource and then I found how to access it via the Resources.Designer.cs file, where it had an automatic getter that let me access the icon, via MyNamespace.Properties.Resources.NameFromAddingTheResource. That returns an object of type I...
Lists: Count vs Count() [duplicate]
...lt;T>), definitely use Count>0. If you're using IEnumerable<T> then Any() is preferred in most cases, unless the underlying source itself is likely to be List<T>.
– Liam Laverty
Nov 7 '16 at 16:35
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SQL command to display history of queries
...up-to-date with your open MySQL CLI so you're likely to have to exit MySQL then read the file.
– Joel Mellon
May 25 '16 at 17:44
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Rails: select unique values from a column
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If you're going to use Model.select, then you might as well just use DISTINCT, as it will return only the unique values. This is better because it means it returns less rows and should be slightly faster than returning a number of rows and then telling Rails to ...