DllCheck.Test() checks to make sure the Steamworks redistributable binaries are the correct version. This is particularly useful when you upgrade Steamworks.NET, Especially if you are not using the Steamworks.NET editor scripts. Running Steamworks.NET with the wrong steam_api.dll will likely result in issues. (Currently only checks steam_api[64].dll)
If it returns true it starts the Steam client if required and launches your game again through it, you should then manually close your application as quickly as possible. This effectively runs steam://run/[AppId] so it may not relaunch the exact executable that called it.
{steam api restart app if necessary}
If the steam_appid.txt file is present in the current working directory then SteamAPI_RestartAppIfNecessary() will return false. This allows you to develop without relaunching through Steam every time.
Being that this is the first Steamworks function which gets called it is the ideal location to ensure that the steam_api.dll can infact be loaded. This is accomplished by wrapping this function call in a try..catch block to catch DllNotFoundException.
To be more specific about the steam_api.dll error itself -- whenever you use a Steam-enabled game, it has to connect to steam via its "API". An API is an Application Programming Interface, which is technical speak for a set of hooks/actions that can be invoked by another program, for a standalone application.
For example, if you try and load up COD and log in with Steam, COD will use Steam's API to log you into their service. Ultimately, what it means is that although the error cites Steam, it's *not* likely Steam that's the problem. The biggest issue is that your game overwrote the original steam_api.dll with one which didn't work as well. Either way, the fixes are listed below...
Re-Install SteamThe first step is to re-install SteamWhilst I mentioned that Steam is not the problem, the core issue is that steam_api.dll will have been overwritten by your game.As such, you need to make sure that you are able to get the original version back, which means re-instaling it. Doing this is quick and simple:- Press "Windows" + "R" keys on your keyboard- Type "control.exe appwiz.cpl" and press "OK"- From the list that shows, select "Steam", right-click and select "Uninstall"- Wait for the uninstall to complete and restart your PCAfter restarting the system, you need to be able to get the latest version of Steam downloaded & installed. To do this, just head to Steam's website and download the latest version of the client.Download it and install it. After doing this, restart your system again and try loading the game. Since re-installing replaces all of Steam's files, steam_api.dll should be replaced with the latest version.
Re-Install Affected SoftwareIf you don't have Steam, or re-installing it doesn't work, you'll need to re-install any of the affected software.The error you're experiencing typically shows when you're running a game (which relies on Steam). As such, the best way to ensure that it doesn't have any corrupted files or settings is to simply re-install said game. This is done by following these steps:- Press "Windows" + "R" keys on your keyboard- Type "control.exe appwiz.cpl" and press "OK"- From the list that shows, select the game, right-click and select "Uninstall"- Wait for the uninstall to complete and restart your PCOnce restarted, you'll want to then attempt to re-install the game, preferably downloading a fresh copy from the Internet. After doing this, restart again and see if the error persists. If it does, continue with the next steps.
Update WindowsThe next step is to update Windows.This might sound trivial, but the number of people running dangerously out of date systems is remarkable (check WannaCry for proof of that). Updating Windows is free and - at least to me - there is no reason why you wouldn't want to do it. The process is very simple and ensures that any potential bugs inside your system are taken care of properly...Windows 7- Click the "Start" button (bottom left)- Click on "Control Panel"- Click on "System & Security"- Under the "Windows Update" heading, select "Check for Updates"- Download & install any updates it findsWindows 10- Right-click on the "Start" button (bottom left taskbar)- Select "Settings"- Click "Update & Security"- Click "Check for updates"- Let the system download & install any of the updates it requiresThis may require a restart.And - honestly - it probably won't fix your error... but should ensure that the system is running as smoothly as possible (fixing the majority of bugs that could be causing it to show). The next step should solve the error if it still shows.
Download & Replace steam_api.dll On Your System Lastly, you'll want to download and replace steam_api.dll on your system.Most tutorials will recommend this from the get-go. Whilst okay, there may be other issues at play - hence why we tried re-installing first. It's far better to get the "official" file from the software vendor by way of installing the software, than to just download some DLL from the Internet. Since they didn't work, we'll have to use the steps outlined here to replace the DLL on your system:- Go to Google and search for "steam_api.dll" download- There will be a number of sites which appear at the top (typically dll-files.com or similar)- Choose one and then look to download the applicable steam_api.dll for your system (be careful to pick the correct x86/x64 version)- Once you find a good site, download the ZIP to your hard drive- Open the ZIP and extract the DLL contained within- Right-click on the DLL and select "Copy"- Browse to c:/Windows/System32, right click in a white space and select "Paste"- If the system asks to overwrite an existing file, select "OK"- From here, you need to press "Windows" + "R" keys on your keyboard- Into the "Command Prompt", type the following, pressing "Enter" after each: regsvr32 /u steam_api.dll + regsvr32 /I steam_api.dllThis should show a "success" message. After doing this, restart your system and try playing the game again.
Both tier0_s.dll and vstdlib_s.dll files are only required when explicitly linking against them using the "-force_steamclient_link" flag for dedicated server builds. Client builds never need these files.
All games using the Steam Online Subsystem must have a valid application ID because the Steamworks API won't initialize if it doesn't know your application's Steam App ID.Before initializing Steam, UE4 will generate steam_appid.txt (during a graceful shutdown of the engine, UE4 deletes this file).It's important to note that steam_appid.txt must be located in the same directory as your application's executable file because Steam will look for the text file in the current working directory.Additionally, the file should not be included in any Steam images.
If you open steam_appid.txt, you'll see a SteamDevAppId entry, which is a field that hints your application's ID to Steam.This makes it unnecessary to launch the game using the Steam client (although it must be running).
This category of sources requires interfacing with external non-Spark libraries, some of them withcomplex dependencies (e.g., Kafka). Hence, to minimize issues related to version conflictsof dependencies, the functionality to create DStreams from these sources has been moved to separatelibraries that can be linked to explicitly when necessary.
You can easily use DataFrames and SQL operations on streaming data. You have to create a SparkSession using the SparkContext that the StreamingContext is using. Furthermore, this has to done such that it can be restarted on driver failures. This is done by creating a lazily instantiated singleton instance of SparkSession. This is shown in the following example. It modifies the earlier word count example to generate word counts using DataFrames and SQL. Each RDD is converted to a DataFrame, registered as a temporary table and then queried using SQL.
To summarize, metadata checkpointing is primarily needed for recovery from driver failures,whereas data or RDD checkpointing is necessary even for basic functioning if statefultransformations are used.
In addition to using getOrCreate one also needs to ensure that the driver process getsrestarted automatically on failure. This can only be done by the deployment infrastructure that isused to run the application. This is further discussed in theDeployment section.
The existing application is shutdown gracefully (seeStreamingContext.stop(...)or JavaStreamingContext.stop(...)for graceful shutdown options) which ensure data that has been received is completelyprocessed before shutdown. Then theupgraded application can be started, which will start processing from the same point where the earlierapplication left off. Note that this can be done only with input sources that support source-side buffering(like Kafka) as data needs to be buffered while the previous application was down andthe upgraded application is not yet up. And restarting from earlier checkpointinformation of pre-upgrade code cannot be done. The checkpoint information essentiallycontains serialized Scala/Java/Python objects and trying to deserialize objects with new,modified classes may lead to errors. In this case, either start the upgraded app with a differentcheckpoint directory, or delete the previous checkpoint directory.
The amount of cluster memory required by a Spark Streaming application depends heavily on the type of transformations used. For example, if you want to use a window operation on the last 10 minutes of data, then your cluster should have sufficient memory to hold 10 minutes worth of data in memory. Or if you want to use updateStateByKey with a large number of keys, then the necessary memory will be high. On the contrary, if you want to do a simple map-filter-store operation, then the necessary memory will be low. 2ff7e9595c
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