Selenium supports automation of all the major browsers in the market through the use of WebDriver . WebDriver is an API and protocol that defines a language-neutral interface for controlling 如何开始使用MetaTrader5进行交易？ the behaviour of web browsers. Each browser is backed by a specific WebDriver implementation, called a *driver*. The driver is the component responsible for delegating down to the browser, and handles communication to and from Selenium and the browser.
This separation is part of a conscious effort to have browser vendors take responsibility for the implementation for their browsers. Selenium makes use of these third party drivers where possible, but also provides its own drivers maintained by the project for the cases when this is not a reality.
The Selenium 如何开始使用MetaTrader5进行交易？ framework ties all of these pieces together through a user-facing interface that enables the different browser backends to be used transparently, enabling cross-browser and cross-platform automation.
There is also a set of specialized browsers out there typically used in development environments. We can make use of some of these browsers for automation purposes also, 如何开始使用MetaTrader5进行交易？ and Selenium ties in support for the following specialized drivers:
Selenium can be extended through the use of plugins. Here are a number of plugins created and maintained by third parties. For more information on how to create your own plugin or have it listed, consult the docs.
Please note that these plugins are not supported, maintained, hosted, or endorsed by the Selenium project. In addition, be advised that the plugins listed below are not necessarily licensed under the Apache License v.2.0. Some of the plugins are available under another free and open source software license; others are only available under a proprietary license. Any questions about plugins and their license of distribution need to be raised with their respective developer(s).
One of the most fundamental techniques to learn when using WebDriver is how to find elements on the page. WebDriver offers a number of built-in selector types, amongst them finding an element by its ID attribute:
As seen in the example, locating elements in WebDriver is done on the WebDriver instance object. The findElement(By) method 如何开始使用MetaTrader5进行交易？ returns another fundamental object type, the WebElement .
- WebDriver represents the browser
- WebElement represents a particular DOM node (a control, e.g. a link or input field, etc.)
Once you have a reference to a web element that's been “found”, you can narrow the scope of your search by using the same call on that object instance:
WebElement cheese = driver.findElement(By.id( "cheese" )); WebElement cheddar = cheese.findElement(By.id( "cheddar" ));
You can do this because both the WebDriver and WebElement types implement the SearchContext interface. In 如何开始使用MetaTrader5进行交易？ WebDriver, this is known as a role-based interface . Role-based interfaces allow you to determine whether a particular driver implementation supports a given feature. These interfaces are clearly defined and try to adhere to having only a single role of responsibility. You can read more about WebDriver's design and what roles are supported in which drivers in the [Some Other Section Which Must Be Named](#).
Consequently, the By interface used above also supports a number of additional locator strategies. A nested lookup might not be the most effective cheese location strategy since it requires two separate commands to be issued to the browser; first searching the DOM for an element with ID “cheese”, then a search for “cheddar” in a narrowed context.
To improve the performance slightly, we should try to use a more specific locator: WebDriver supports looking up elements by CSS 如何开始使用MetaTrader5进行交易？ 如何开始使用MetaTrader5进行交易？ locators, allowing us to combine the two previous locators into one search:
It's possible that the document we are working with may turn out to have an ordered list of the cheese we like the best:
Since more cheese is undisputably better, and it would be cumbersome to have to retrieve each of the items individually, a superior technique for retrieving cheese is to make use of the pluralized version findElements(By) . This method returns a collection of web elements. If only one element is found, it will still return a collection (of one element). If no elements match the locator, an empty list will be returned.
How to start working with GTest and CMake
I have recently been sold on using CMake for compiling my 如何开始使用MetaTrader5进行交易？ C++ projects, and would now like to start writing some unit tests for my code. I have decided to use the Google Test utility to help with this, but require some help in getting started.
All day I have been reading various guides and examples include the Primer, an introduction at IBM and some questions on SO (here and here) as well as other sources I've lost track of. I realise there's plenty out there but somehow I am still having difficulties.
I'm currently trying to implement the most basic test, to confirm I've compiled/installed gtest right and it's not working. The only source file (testgtest.cpp) is taken almost exactly from this previous answer:
and my associated CMakeLists.txt 如何开始使用MetaTrader5进行交易？ is as follows:
Note that I have chosen to link against gtest_main instead of providing the main at the end of the cpp file as I believe this will allow me to scale testing up more easily to multiple files.
When building the generated .sln file (in Visual C++ 2010 Express) I unfortunately get a long list of errors of the form
which I think means that I'm not successfully linking to the gtest libraries. I have made sure that when linking against the debug libraries, I have then tried to build in debug mode.
Having done some more digging, I think my issue is something to do with the type of library I am building gtest into. When building gtest with CMake, if BUILD_SHARED_LIBS is un-checked, and I link my program against these .lib files I get the errors mentioned above. However, if BUILD_SHARED_LIBS is checked then I produce a set of .lib and .dll files. When now linking against these .lib files the program compiles, but when run complains that it can't find gtest.dll.
What are the differences between a SHARED and a not SHARED library, and if I choose not shared, why doesn't it work? Is there an option in the CMakeLists.txt for my project that I am missing?
The solution involved putting the gtest source directory as a subdirectory of your project. I've included 如何开始使用MetaTrader5进行交易？ the working CMakeLists.txt below if it is helpful to anyone.
Here is a complete working example that I just tested. It downloads directly from the web, either a fixed tarball, or the latest subversion directory.如何开始使用MetaTrader5进行交易？
Most likely, the difference in compiler options between your test binary and the Google Test library is to blame on such errors. That's why it's recommended to bring in Google Test in the source form and build it along with your tests. It's very easy to do in CMake. You just invoke ADD_SUBDIRECTORY with the path to the gtest root and then you can use public library targets ( gtest and gtest_main ) defined there. There is more background information in this CMake thread in the googletestframework group.
 The BUILD_SHARED_LIBS option is only effective on Windows for now. It specifies the type of libraries that you want CMake to build. If you set it to ON , CMake will build them as DLLs as opposed to static libs. In that case you have to build your tests with -DGTEST_LINKED_AS_SHARED_LIBRARY=1 and copy the DLL files produced by the CMake to the directory with your test binary (CMake places them in a separate output directory by default). Unless gtest in static lib doesn't work for you, it's easier not to set that option.
Which exception terminates process ? (iis's w3wp)
I already read Han's answer here which redirects to SSCLI20 source code where he gave an example of the code :
So I downloaded the 如何开始使用MetaTrader5进行交易？ SSCLI20 and searched for more of TerminateProcess(GetCurrentProcess().
And found those entries :
But I'm not sure that this is the whole list , and even if so - it is notvery clear.
Where can I 如何开始使用MetaTrader5进行交易？ find the complete list of exceptions which terminates the process ?
Richter to the rescue.
The professional term is called : corrupted state exceptions (CSE'e)
Corrupted State Exceptions (CSE): These are the exceptions which cannot be catched. Behind the scene Environment's FailFast method throws one of these exceptions. Hence, it cannot be catched and your application ends with an unhandled exception.
Note: Even with the attribute HandleProcessCorruptedStateExceptions, we cannot handle the following exceptions, for a given reason:
StackOverflowException - As this is a hardware failure and there is no more stack available for further processing (Thanks Abel Braaksma for pointing this out).
ExecutionEngineException - It occurs because of heap memory corruption and hence cannot be handled further (Reference).
Another helpful link via Abhishek Sur :
Use Microsoft's Debug Diagnostic Tool
Take a look at http://support.microsoft.com/kb/919789/en-us which explains all 如何开始使用MetaTrader5进行交易？ the necessary steps in detail.
Other exeptions which causes crash 1. Access Denied' exception 2. Bit rate throttling 3. InvalidOperationException other than the above which you posted.
Set up cross-domain tracking (analytics.js)
Cross-domain tracking makes it possible for Analytics to see sessions on two related sites (such as an ecommerce site and a separate shopping cart site) as a single session. This is sometimes called site linking.
Set up cross-domain tracking by modifying the tracking code