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Create FileStream in memory instead of saving a physical file on disk


Create FileStream in memory instead of saving a physical file on disk

By : Sagar R N
Date : November 20 2020, 03:01 PM
I wish this help you Why not use the requestStream directly? It is an instance of Stream and your API end point expects an instance of Stream, there is no need to copy the content of requestStream to any intermediary point unless you want to add unnecessary overhead.
code :
Stream requestStream = await Request.Content.ReadAsStreamAsync();

var postedFile = ms.CreateMedia(fileName, folder.Id, "file");
postedFile.SetValue("umbracoFile", fileName, requestStream);
ms.Save(postedFile);


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Saving create / modify dates of file when writing / restoring a binary filestream

Saving create / modify dates of file when writing / restoring a binary filestream


By : Riad Rfm
Date : March 29 2020, 07:55 AM
I wish this help you You can add database columns for the data you want to save about your file. When you write a file to the database, put this information into the columns. When you read, change file properties according to the data from columns.
CreateDibSection on Disk instead of physical memory

CreateDibSection on Disk instead of physical memory


By : Tom Gentry
Date : March 29 2020, 07:55 AM
To fix this issue What is the failure mode? You say "physical memory": windows uses virtual memory, it will page to disk, you don't need to worry about running out of physical memory beyond the performance hit. If you're running out of address space, using the disk may not be able to help you.
However, CreateDIBSection can take a HANDLE to a file mapping (created with CreateFileMapping ). If the internals of the function and related HBITMAP functions are smart enough, it may be possible to avoid exhausting your address space by leveraging that capability. If they are "smart" they will use MapViewOfFile to map relatively small "windows" of the file as needed into your process's address space.
how to reuse stdout output without saving it to physical disk file

how to reuse stdout output without saving it to physical disk file


By : Oleksandr Prokhorenk
Date : March 29 2020, 07:55 AM
I wish this helpful for you don't use pipelines inside nested loops
Based on new comments and another look at the original question, I would strongly recommend against using a pipeline processing large amounts of data inside a nested loop. Shell pipelines are far from efficient, and incur lots of process overhead.
code :
command_1 | awk '{ print $2 }' | command_2
Having Trouble Saving Boot Sector On Disk And OS On Disk Then Loading It In Memory

Having Trouble Saving Boot Sector On Disk And OS On Disk Then Loading It In Memory


By : Kevin.P
Date : March 29 2020, 07:55 AM
I wish this helpful for you Okay, you're excused. Nobody was born knowing this stuff!
Going back to when it worked (your figure 1.2), you "must have" read sector 2 from your CD image to 0x7E00 - similar to what you do at the end of your bootsector, only from a different drive (dl). I'm guessing that BIOS thinks the CD image is drive 0. The boot drive number should be in dl, so you might be able to just leave it alone (make dh 0, though). After doing this, you can probably write from 0x7C00 to hard drive (drive 80h) sector 1 and from 0x7E00 to drive 80h sector 2 - as you're doing. But do you really want to do this every time you boot?
Deleting the physical file from disk causes SQL FileStream to throw an exception for the entire table

Deleting the physical file from disk causes SQL FileStream to throw an exception for the entire table


By : Ray Villa
Date : March 29 2020, 07:55 AM
it fixes the issue SQL Server maintains an exclusive lock on files during operation, and assumes it can continue to do so. It also requires that files are not modified outside of it's control, particularly with respect to 'write ahead logging'.
To put your question in another context: I go and hex edit data in a table, I destroy one row and make the 8kb page it sits on inaccessible because when read from disk it no longer passes the CRC check. When I do a SELECT * FROM table, if I touch that data-page on disk, the query will bomb out just as you've observed with your filestream.
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