[Qt-embedded-interest] /dev/fb0

[pushparaj muthu]

Hi Chris

Yes absolutely correct

I want to run the Qt Frame buffer for development and have Qt UI interact
with it.

But I did not get understand why it throws error message

QscreenLinuxFb: Connect; No such file or directory
Error opening frame buffer device /dev/fbo

How to solve this issue

Regards
Raj



On 3/22/09, Chris Pane <chris.pane at labxtechnologies.com> wrote:
>
> Are you trying to use the linux virtual frame buffer or the Qt
> virtual/simulator frame buffer?
>
> I do most of my host side Qt Embedded development using the qvfb simulator,
> which creates a Qt Virtual frame buffer w/ shared memory. So in that case,
> your Qt program would use the shared memory region as a frame buffer and the
> qvfb simulator program (qvfb is an example or tool Qt application in the
> standard host side linux Qt tarball (Last I checked, it was not part of the
> embedded kit)) displays the UI. You can even skin QVFB to look like your
> device.
>
> The linux virtual frame buffer is simply a mmaped region that sets itself
> up and allows programs to write to it. You can verify whats written by
> dumping /dev/fb0 but thats about it.
>
> It hink you want to run the Qt framebuffer for development as that lets you
> see you Qt UI and interact with it.
>
> -Chris
>
>
>
>
> If you want to run
>
> On Sat, Mar 21, 2009 at 3:35 PM, Donal <donaloconnor at gmail.com> wrote:
>
>> Are you sure you have permissions to open /dev/fb0
>>
>> You might not have read/write permission under your current user. Have you
>> tried modifying permissions or switching to root user.
>>
>> Donal
>>
>>   On Sat, Mar 21, 2009 at 6:58 PM, pushparaj muthu <
>> muthu.pushparaj at gmail.com> wrote:
>>
>>
>>>   Hi
>>>
>>>
>>>
>>> I have downloaded qt-embedded -Linux -open source-src -4.43 and compiled
>>> the code
>>>
>>>
>>>
>>> When I try to run example program with –qws (virtual frame buffer is
>>> working  )
>>>
>>>
>>>
>>> It gives error message QscreenLinuxFb: Connect; No such file or directory
>>>
>>>
>>>
>>> Error opening frame buffer device /dev/fbo
>>>
>>>
>>>
>>> But I have enabled frame buffer support in my desktop kernel (fedora 8)
>>>
>>>
>>>
>>> Please guide me in the right direction
>>>
>>>
>>>
>>>
>>>
>>> Regards
>>>
>>> Raj
>>>
>>>
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>>>
>>
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>
>
>
>
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