For a recent project, we need to port the code from VC to G ++ for compilation. In this process, we encountered several platform-related problems-the Code Compiled smoothly under VC, however, an error is reported during compilation in G ++.
Here we will share it with you:
1. Enumeration type issue code
enum MyWeek{ Monday, Tuesday,};MyWeek mw = MyWeek::Monday;VC
D: \ Vc \ main. cpp (17): Warning c4482: non-standard extension used: the enumerat
The code is as follows
Copy Code
Gets the size of a picture scaled down by equal proportions.public static Size getnewsize (int maxwidth, int maxheight, int imageoriginalwidth, int imageoriginalheight){Double w = 0.0;Double h = 0.0;Double SW = convert.todouble (imageoriginalwidth);Double sh = convert.todouble (imageoriginalheight);Double MW = convert.todouble (maxwidth);Double MH = convert.todouble (maxheight);if (SW {w = SW;h = sh;}e
Formula for the relationship between attenuation and distance of Wi-Fi wireless signal transmission [Indoor Location]
Calculation of wireless communication distance1. DBM dbmv dbuv Conversion RelationshipDBM = 10log (pout/1 MW), where pout is the power value in the unit of MWDbmv = 20log (Vout/1mV), where Vout is the voltage value in the unit of MVDbuv = 20log (Vout/1uv), where Vout is the voltage value in the unit of UVConversion Relationship:Pout =
transmission range is 300 meters, and the maximum indoor transmission range is 100 meters if obstacles exist. This is the most widely used transmission protocol. It has many advantages over wired networks:
1. No wiring requiredThe main advantage of wifi is that it does not require wiring and is not restricted by wiring conditions. Therefore, it is very suitable for mobile office users and has broad market prospects. At present, it has expanded from traditional special industries such as health
Read oreilly.web.scraping.with.python.2015.6 Notes---Crawl1. The function calls itself, so that a loop is formed and a loop is set:From urllib.request import urlopenfrom bs4 import Beautifulsoupimport repages = set () def getlinks (pageurl): Global page s HTML = urlopen ("http://en.wikipedia.org" +pageurl) bsobj = BeautifulSoup (HTML, "lxml") Try:print (bsobj.h1 . Get_text ()) print (Bsobj.find (id = "Mw-content-text"). FindAll ("P") [0])//Find page i
Introduction WebLogic Version Information 10.3First, start the WebLogic serviceUse the command after logging in with the root user: #su weblogic to switch the user to the WebLogic user.1. Go to the home folder where my installation path is (/home/mw/weblogic), use the #ls command to view the file information in the Bin folder:2. Use the./config.sh command to perform the WebLogic service domain configuration startup file, after the startup file initial
role: Can make markdown syntax highlighting. 1. Install. Managed using the pathogen plugin. CD ~/.vim/bundlegit clone https://github.com/plasticboy/vim-markdown.git2. Configuration, after the installation is completed, automatically by pathogen, but markdown write Jekyll blog, you need to configure the YAML syntax. Add the following configuration in ~/.VIMRC:Let g:vim_markdown_frontmatter=13.markdown Code completion tool SnipmateCD ~/.vim/bundlegit clone https://github.com/tomtom/tlib_vim.gitgit
represents "wireless fidelity", refers to a fully compatible 802.11 standard ieee802.11b subset, it uses open 2.4GHz direct sequence spread spectrum, the maximum data transfer rate of 11Mbps, can also be based on the signal strength of the transmission rate of 5.5Mbps, 2Mbps and 1Mbps bandwidth. No straight transmission range for the outdoor maximum of 300 meters, indoor barriers in the case of the maximum 100 meters, is now used most of the transport protocol. WiFi wireless networking has ma
The use of the List
Example: The Racer class acts as an element added to the collection, indicating the racer, including two fields: Name and car, available properties to access
public class racer { private string name; public string Name { Get { return name; } }
private string car; public string car { Get { return car; } }
Public Racer (string name, string car){THIS.name = name;This.car = car;}
public override string ToString (){Return name + ', ' + car;}}
When you do a station, you often encounter the ability to generate thumbnails, because you may need to use thumbnails of different sizes for different situations.
The images generated in this article are squares, and only a square thumbnail is enough to ensure that the picture is clear.
When I say here the square is first scaled, then a fixed white bottom and then centered.
Code:
New Outputimg.ashx
Copy Code code as follows:
Resize a picture
private static Size newsize (int max
Why the wireless signal (RSSI) is a negative answer: in fact, the final analysis of why the wireless signal received is negative, this is not easy to understand more. Because the wireless signal is many MW level, so it has been polarized, converted to dbm, does not mean that the signal is negative. 1mW is 0dBm, less than 1mW is a negative number of dbm.
Figure out the definition of signal strength: RSSI (receiving signal strength) Received Signal St
will be reversed, then you can move the cursor toSet the range, then directly under the command to edit.For the whole column operation, VI also provides more convenient editing instructions. The previous mention of deleting the entire column of text refers to theDD is one of them, CC can modify the whole column of text, while YY is to copy the whole column of text, instruction D can beTo delete the cursor until the end of the column.File InstructionsFile instructions to: Beginning, with the edi
), the additional design time stylesheet allows you to use any of these to develop your site. When you want to see how the page looks under another stylesheet, you can easily change it to another style sheet.
Designing a Time style sheet is also useful for developers who want to apply CSS to server-side (such as ASP, PHP, or ColdFusion) or to access the client through JavaScript. Server-side stylesheets are another way to handle the poor support of the client browser for CSS. But in a previous
An antenna (antenna) is a transducer that transforms a traveling wave propagating on a transmission line into an electromagnetic wave propagating in a unbounded medium (usually a free space), or in reverse. A component used in radio equipment to transmit or receive electromagnetic waves. Radio communications, radio, television, radar, navigation, electronic confrontation, remote sensing, radio astronomy and other engineering systems, all the use of electromagnetic waves to transmit information,
yourself or edit an existing style sheet, validation ensures that you don't misuse non-standard tags or bad code. DW MX itself does not contain a CSS validator, and you can use the authentication services provided by the Consortium site. Within the DW MX you can validate HTML or DHTML tags (File > Check page > Validate Markup (for HTML) or File > Check page > Validate as XM L for XHTML.). DW MX provides a number of assistive tools when developing a CSS based site. With the help of
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