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Cannot push to Heroku because key fingerprint
I am new to Rails, and I was trying to deploy a very simple app to Heroku. This is the second app that I deploy, and the first one I was able to do it just fine. However I am having some issues with this one. Whenever I " git push heroku master ", I get this error:
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Show filename and line number in grep output
I am trying to search my rails directory using grep. I am looking for a specific word and I want to grep to print out the file name and line number.
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Getting the first and last day of a month, using a given DateTime object
I want to get the first day and last day of the month where a given date lies in. The date comes from a value in a UI field.
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Apache: “AuthType not set!” 500 Error
It's been a while since I used the Apache httpd web server. I'm firing up a local server for a project and when I try to request localhost/index.html, I get a 500 error and I see this in the error log:
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pdf2htmlEX实现pdf转html - 开源 & Github - 清泛网 - 专注C/C++及内核技术
pdf2htmlEX实现pdf转html首先要感谢pdf2htmlEX的作者Lu Wang，该软件是一个pdf转html的开源软件，效果非常理想。下面两张图片是html和pdf视图下的截图：windows下...首先要感谢pdf2htmlEX的作者Lu Wang，该软件是一个pdf转html的开源软件，效果...
How can I prevent Visual Studio 2013 from closing my IIS Express app when I end debugging?
Previously in 2012, if I debugged in Chrome (for example), and then stopped the debugger, the website would remain running in IIS Express. This no longer seems to be the case in 2013.
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What is object serialization?
What is meant by "object serialization"? Can you please explain it with some examples?
14 Answers
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How to set a stroke-width:1 on only certain sides of SVG shapes?
Setting a stroke-width: 1 on a <rect> element in SVG places a stroke on every side of the rectangle.
3 Answers
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Can virtual functions have default parameters?
If I declare a base class (or interface class) and specify a default value for one or more of its parameters, do the derived classes have to specify the same defaults and if not, which defaults will manifest in the derived classes?
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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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关于QR Code Specification，可参看这个PDF：http://raidenii.net/files/datasheets/misc/qr_code.pdf
基础知识
首先，我们先说一下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每...