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DeviceIoControl VS WriteFile and ReadFile

Q: DeviceIoControl VS WriteFile and ReadFile

When communicating userland and kernel which method is better?
In better I mean have a significant advantage in any case.

I'm a noob and when reading tutorials and codes, they use different methods to communicate.

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RELEVANCY SCORE 200
Preferred Solution: DeviceIoControl VS WriteFile and ReadFile

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RELEVANCY SCORE 51.2

that's the error mesage, the whole thing. it popped up with an ok button at the bottom of it's little window after i woke my son's computer from sleep with the mouse, then logged on as admin, and clicked the MSI Live Update icon on the desktop. the program loaded ok- but the window with the error message popped up right in front of it. does anyone know what it means? i tried searching for a similar message- but i can't seem to find anything.
any help would be much appreciated.
 

A:Flash_MMIO_MAP DeviceIoControl error

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RELEVANCY SCORE 50.4

When i try to open up control panel the popup error occurs, and u click okay and proceed, but it is very annoying, what does it mean? i just installed windows xp, repartitioned the drive into 2, and installed new software but ntohing that would screw it up, software that was on before..
any help would be appreciated, thanks!

joe
 

A:deviceiocontrol() returned false ERROR..help?

It would help if you could give us more specific info about the error message.

Can you copy and paste the error message or take a screenshot and post it here?
 

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RELEVANCY SCORE 48.8

I am trying to send a VS HCI command to hard-reset a BT module and this error comes up after about 70 seconds..
The same code works on Win7 and Win8.1 but Win10 doesn't allow me to do a hard-reset by sending vendor specific HCI command.

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