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The rSD library allows reading and writing to SD cards. The Ethernet shield as well as other shields include a SD slot. The steps required to work with files: 1. Initialize a SD object. You need to pass the CS pin used. See this link for more information: http://www.arduino.cc/en/Reference/SDCardNo
link: https://www.b4x.-different-data-to-sd-card.71450/#post-454215
link: I think, there is no need to set up other pin at SD.Initialize(...); See erel tutorial step 1. on b4r code the SD.initialize(...) is only for CS pin,
link: Erel Can you give an example how to write to the sd card ? Thanks

Right logging system must not be overloaded by the log files amount. So, if the storage is limited - any logging must be looped. The system log file name is hardcoded, the max file size also. Actual Arduino's SD-card class can open file only for READ, WRITE or APPEND. No TRUNCATE is possible (i do

I know you meant the SD Card. That's why you need to use the ExternalStorage library. You seem to think that won't work for you but I fail to understand why you think that, particularly as all you want to do is to read the file. You should be able to use Bitmap.Initialize2 to read a bitmap from a fi
link: The standard way to achieve it is with ExternalStorage, which requires the user to select the folder once.
link: At the end, what I need is to access thousands of files from the Sd card. At the moment, I manage them in DirDefaultExternl (ok .. GetSafeDirExternal.
link: The ManageExternalStorage library is intended to allow apps to access almost the entire internal file store, Confusingly this is what Gogle calls the

You can access the secondary storage without any permission using RuntimePermissions.GetSafeDirDefaultExternal, however it will not help in this case as you want to files to remain after the app is uninstalled. In that case ExternalStorage is indeed the solution. You will let the user select a fold
link: Hi, My app will store a large amount of images during its use, and i want to store them on SD card (if available). So i planned to have a 'folder cho
link: Thanks for the reply, I have tried the ExternalStorage Example; when I select a folder the app still shows "Root" at the top (see screenshot), while t
link: A further, possibly important, clarification of using ExternalStorage class which can allow access to both a folder on an SD card and also to a folder

Do you write/read files (from assets maybe?). "SD-Card" doesn't mean the external SD-Card as even the internal memory is handled as/called "SD-Card". Note that you can't access the external SD-card anyway. So there's no issue here.
link: They are talking about the WRITE_EXTERNAL_STORAGE permission. There are several ways to avoid it: 1. Use File.DirInternal instead of File.DirRootExte
link: Hi all I have built an app which is being distributed to quite a few of our customers.. however during install of the app the customer is told it will

Last attempt here. There is no such path. The sd card on Android 4.4+ doesn't behave like a regular file system. You can only access it with ExternalStorage.
link: The old dialog will not help you. The only way to access the sd card is with ExternalStorage. It doesn't behave like a regular file system.
link: Read the tutorial: https://www.b4x.-access-sd-cards-and-usb-sticks.90238/ Don't confuse a real sd card or USB drive with File.DirRootExternal.
link: No, I mean I put a directory of files on an sd card on my PC (for example), then I put it in my phone. Now my program ask where are those files. In t

Probaly you mean to move an app to sdcard. Some devices allow that due to stock firmware or when rooted. This doesn't mean that all apps can run in this environment. It was helpful if you post the logs here.
link: Sure you cannot use flash as ram. Flash is a storage memory while Ram is a working area.
link: Hoi Folks, are there any known issues with the feature that can integrate the SD card memory as "legal" RAM ? I tried to test a simple GPS example wi
link: No, i dont meant that. If I i.e. open a file explorer, there is only SD-CARD FROM SANDISK with a total of 32 GB Also this sample with SlidingPanels c

Hi, All Just trying rSD lib with ESP32 and SPI card slot. The main, it's usage "/" root prefix at the file names. But how to save multiline text .CSV files correctly ? Such sub... private Sub Savelog As Boolean If sd.OpenReadWrite("/log.dat") = True Then sd.Position = sd.CurrentFile.S
link: @hatzisn what do you mean ?
link: Try to set the buffer as fixed array and for each BC.StringToBytes create a new fixed array with length equal to string length, and BC.ArrayCopy it to

There isn't one. It avoids loading the complete array into memory. You can use a counter to find the correct index or better use B4RSerializator to write and read the data.
link: Thanks Erel, I'll follow your suggestion
link: Dear All, I'm a newbie in this forum and I tried to get experienecd with B4R. I have the need to perform searches within arrays of bytes acquired via

Such path cannot be created, tested
link: each segmant of the path must be 8 or less characters, filename 8 or less, extention 3 , max path & filename & ext < 260 chars /one/two/three/four/fil
link: HI, All I read that path should be 8.3 format for FAT32. But ... how to mkdir("/year/month/day/hour") ? Is it impossible at all ? Only mkdir("/year/

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