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MFC OnEraseBkgnd浅析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...工重载
在要重载的类（通常为CView的子类）声明部分(.h文件)添加虚函数的声明：
virtual BOOL OnEraseBkgnd(CDC* pDC);
注意添加在//{{AFX_VIRTUAL(CMyView)和//}}AFX_VIRTUAL之间。
在类的定义文件(.cpp)中的MESSAFE_MAP部分，//{{AFX_MSG_MAP(CMyView)和 //...
Linux 进程卡住了怎么办？ - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...程来模拟一下（因为 JuiceFS 客户端基于 FUSE，是用户态的文件系统，比较容易模拟 I/O 故障）。
先将 JuiceFS 挂载到前台（在 ./juicefs mount 命令中加一个 -f 参数），然后用 Cltr+Z 把这个进程停掉，这时候用 ls /jfs 去访问挂载点，会...
How to run SQL script in MySQL?
...to file is taking data dump, I guess SELECT ... INTO OUTFILE /path/to/file.csv is more efficient way. See options and syntax here - dev.mysql.com/doc/refman/5.7/en/select-into.html
– Anis
Feb 21 '18 at 6:43
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What is a vertical tab?
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And some data providers like TechData use it in CSV files to replace \n.
– Wiliam
Nov 12 '13 at 9:05
2
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Define variable to use with IN operator (T-SQL)
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There are two ways to tackle dynamic csv lists for TSQL queries:
1) Using an inner select
SELECT * FROM myTable WHERE myColumn in (SELECT id FROM myIdTable WHERE id > 10)
2) Using dynamically concatenated TSQL
DECLARE @sql varchar(max)
declare @list va...
Eclipse count lines of code
...the Eclipse Metrics Plugin. To create a HTML report (with optional XML and CSV) right-click a project -> Export -> Other -> Metrics.
You can adjust the Lines of Code metrics by ignoring blank and comment-only lines or exclude Javadoc if you want. To do this check the tab at Preferences -&g...
How do I use $scope.$watch and $scope.$apply in AngularJS?
... Using this.myVar puts myVar on the scope.
– Marcus Rådell
Oct 3 '14 at 12:15
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ImageUtil 扩展：图像工具扩展，提供图像处理和变换功能 · App Inventor 2 中文网
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从指定路径创建图像。
路径：文本类型，图像文件路径
返回值：组件类型，创建的图像组件
HFlip 水平翻转(组件)
水平翻转图像。
组件：组件类型，要翻转的图像组件
VFlip 垂直翻...
Remove duplicated rows
I have read a CSV file into an R data.frame. Some of the rows have the same element in one of the columns. I would like to remove rows that are duplicates in that column. For example:
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Simple way to encode a string according to a password?
...re cipher. It is one of the strongest of the simple ancient ciphers.
Vigenère cipher
It's quick and easy to implement. Something like:
import base64
def encode(key, string):
encoded_chars = []
for i in xrange(len(string)):
key_c = key[i % len(key)]
encoded_c = chr(ord(st...