flags | 易学教程

Bash if statement with multiple conditions throws an error

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问题 I'm trying to write a script that will check two error flags, and in case one flag (or both) are changed it'll echo-- error happened. My script: my_error_flag=0 my_error_flag_o=0 do something..... if [[ "$my_error_flag"=="1" || "$my_error_flag_o"=="2" ] || [ "$my_error_flag"="1" && "$my_error_flag_o"="2" ]]; then echo "$my_error_flag" else echo "no flag" fi Basically, it should be, something along: if ((a=1 or b=2) or (a=1 and b=2)) then display error else no error fi The error I get is: line

Making only one column of a QTreeWidgetItem editable

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问题 I have a QTreeWidgetItem with two columns of data, is there any way to make only the second column editable? When I do the following: QTreeWidgetItem* item = new QTreeWidgetItem(); item->setFlags(item->flags() | Qt::ItemIsEditable); all columns become editable. 回答1: Looks like you will have to forgo using QTreeWidget and QTreeWidgetItem and go with QTreeView and QAbstractItemModel . The "Widget" classes are convenience classes that are concrete implementations of the more abstract but more

Chart : displaying boolean flags in a time plot as filled rectangles (instead of as lines)

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问题 I use the C# Chart in WinForms to plot a variety of variables in real time using the "line" chart type. That works well for analog values, but it's less than ideal for on/off flags. I'd like to plot multiple flags as horizontal bars that are filled when the value is '1" and clear when the value is '0'. Before I start coding a solution from scratch, do you have any suggestion on how I could take advantage of any features of the "chart" object to implement this more effectively? EDIT: I am

qt read ready signal

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问题 I'm trying to set up a serial connection with a device which runs on a 1996 processor. This means that it can take several second for the data to be transmitted back to me. I know that the readyRead signal is generated every time new data is available, but my question is how long is generated for. Also is their a way that I can test for the ready read being low because if it stops being emitted when their is no longer any data left to read in, that would be really helpful. do{ ui->label_5-

x86 assembly Language - TEST operation and its effect on flags

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问题 I'm working on an x86 assembly language homework assignment and do not understand how exactly the test operation effects the carry, zero and sign flags. As I understand it, we are doing a bitwise comparison AND on two operands. In the first example, bits 1,2,3,4, and 7 match up. Does this mean that the result of the AND is 11110010? This would set the sign flag to negative right? Zero flag would not be set because this binary result is not 0. And the carry flag? I'm not really sure how to

Using flag to identify spoken language

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问题 In the webapp I am doing, I need to identify language people are speaking. I wanted to use flag to do that. But I have some problems. For example, if you speak French, you can put the French flag. But if you speak English you can put either the US or UK flag or a mix of both. Which flag to choose for Arabic language ? Saudi Arabian flag ? Algeria ? Morocco ? 回答1: I think it's usual to use fragments of the language as a kind of graphic (text, instead of flags), for example: english français

Python全栈正则表达式（re模块正则接口全方位详解）

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re模块是Python的标准库模块模块正则接口的整体模式 re.compile 返回regetx对象 finditer fullmatch match search 返回 match对象 match.属性|方法 re模块的使用: regex = re.compile(pattern,flags = 0) 功能：生成正则表达式对象参数： pattern 正则表达式 flags 功能标志位，丰富正则表达式的匹配返回值：返回一个正则表达式对象 re.findall(pattern,string,flags = 0) 功能：根据正则表达式匹配目标字串内容参数： pattern 正则表达式 string 目标字符串返回值：列表里面是匹配到的内容如果正则表达式有子组，则只返回子组中的内容 regex.findall(string,pos,endpos) 功能：根据正则表达式匹配目标字串内容参数： string 目标字符串 pos,endpos : 截取目标字符串的起止位置进行匹配，默认是整个字符串返回值：列表里面是匹配到的内容如果正则表达式有子组，则只返回子组中的内容 re.split(pattern,string,flags = 0) 功能：通过正则表达式切割目标字符串参数： pattern 正则 string 目标字串返回值：

Intent flags - How to start a new activity instance and have others closed

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问题 I am not really familiar with intent flags, so please, bear with me. I am doing an application which displays stuff from a database in a ViewPager. I also have a widget which from time to time pulls out a random row and displays it. Now, when I click on it, I am taken to an activity where the same content is displayed and now I can take action on it. Everything works, however when I have an activity already running and then click on the widget, it seems it creates a new instance, because when

Restoring git merge conflict flags

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问题 I am trying to work out a method of sharing merge conflicts with other members of my team. We have some very large branches and merging them creates a lot of conflicts. I have tried several different methods, and my current attempt involves pushing the files in a conflicted state to the remote repo (leaving the merge markers in the files), and then running an annoyingly long alias to grep through the files and re-create the merge files manually (LOCAL, BASE, REMOTE). I recently found the git

Restoring git merge conflict flags

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