[poppler] About pdf to image

[杨辉强]

Hi, mpsuzuki:
     Nice to hear from you again. I have written a memory jpeg writer 
and change some parts of poppler's code such that the image can  be 
saved into memory directly. But my companion hates  to change the source 
code. So I will dig the source code and find the appropriate interface 
to do this. Thank you very much, mpsuzuki.

Regards,

On 12/19/2011 04:34 PM, suzuki toshiya wrote:
> Hi,
>
> Good to hear that your target platform is Ubuntu, yes, what I mean
> is the utilization of ramdisk-like filesystem. Please check the output
> of the command "cat /proc/mounts". I guess there might be some entries
> including the word "tmpfs" (maybe "/dev/shm" would be there). It is
> the files system like ramdisk, so writing/removing files in there would
> be faster than those in the harddisks. Please check if tmpfs will serve
> for your purpose.
>
> Regards,
> mpsuzuki
>
> 杨辉强 wrote:
>> Hi, mpsuzuki:
>>    Thank you very much. My system is ubuntu. I don't know much about 
>> memory-based file system.
>> Does it mean utility such as ramdisk.
>>
>> On 12/19/2011 12:01 PM, suzuki toshiya wrote:
>>> Hi,
>>>
>>> I guess poppler should have something you want, at least
>>> internally, because the bindings for other frameworks (Qt,
>>> GLib, cpp etc) may deal with the images without creating/
>>> cleaning temporary image files.
>>>
>>> BTW, before searching such, I want to ask an off-topic question;
>>> your target operating system does not support memory-based
>>> file system?
>>>
>>> Regards,
>>> mpsuzuki
>>>
>>> 杨辉强 wrote:
>>>> Hi, all:
>>>>   Thank Brad. I don't want to save images into files and then read 
>>>> files into memory.
>>>> The disk IO expense is high. So what's the utility from another 
>>>> application can do this job? Wish your advice.
>>>>
>>>> Thank you!
>>>>
>>>> On Sun, 18 Dec 2011 11:34:17 AM Brad Hards wrote:
>>>>
>>>> This should have gone to a mailing list.
>>>>
>>>> How are you possibly going to use the utility from another 
>>>> application and
>>>> copy to memory without making any code changes?
>>>>
>>>> Brad
>>>>
>>>>
>>>>
>>>> On 12/18/2011 08:47 AM, 杨辉强 wrote:
>>>>> Hi, all:
>>>>>    In web search engine, I want to support the pdf snapshot. So I 
>>>>> want to convert pdf files to images and save the images in a 
>>>>> database. I don't want to change the poppler code.
>>>>> Because that's notconvenient for upgrade the poppler's code.
>>>>>
>>>>> Thank you for your precious advices.
>>>>>
>>>>> On 12/17/2011 03:16 PM, Brad Hards wrote:
>>>>>> On Sat, 17 Dec 2011 02:09:21 PM 杨辉强 wrote:
>>>>>>>      I am a newbie to poppler. I use utils/pdftoppm.cc to 
>>>>>>> convert a pdf
>>>>>>> file into jpeg images.The generated images are save to disk 
>>>>>>> files. Now I
>>>>>>> wish to know whether it can save the images in memory such as a
>>>>>>> vector<std::string>.  Wishing you can give me some advices.
>>>>>> I'm sure that is possible, but you'd need to make some code 
>>>>>> changes (and
>>>>>> consider whether an arbitrary binary blob, containing nulls, is 
>>>>>> really a good
>>>>>> idea in a std::string). The code changes should basically be 
>>>>>> taking the
>>>>>> existing output writer and copying in to a memory location 
>>>>>> instead. I don't
>>>>>> see you'd need to make any real popper changes. How you integrate 
>>>>>> that depends
>>>>>> on the application you're trying to create.
>>>>>>
>>>>>> What is the end-use for this?
>>>>>>
>>>>>> Brad
>>>>>> _______________________________________________
>>>>>> poppler mailing list
>>>>>> poppler at lists.freedesktop.org
>>>>>> http://lists.freedesktop.org/mailman/listinfo/poppler
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> poppler mailing list
>>>>> poppler at lists.freedesktop.org
>>>>> http://lists.freedesktop.org/mailman/listinfo/poppler
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------ 
>>>>
>>>>
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>>>> http://lists.freedesktop.org/mailman/listinfo/poppler
>>>
>>
>

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