[web2py] Re: GAE - Rendering uploaded Blob as jpeg image rather than as a string?
You have two actions:
list_image() - returns an image (always image 1?)
ist_images() - returns the html page.
In the latter you can do:
View:
{{extend 'layout.html'}}
h3Display Jpeg Images/h3
table border=1
tr
thImage Title/th
thImage Blob/th
/tr
{{for img in images:}}
tr
td{{ =img.title }}/td
td{{=img.image_blob }}//td
tdimg src={{=URL('list_image',args=img.id)}} //td
!-- added this line --
/tr
{{pass}}
/table
Anyway, I have the impression you are reinventing the wheel a little.
Did you look into upload field and the downloadaction? They are
designed to do what you need.
On Feb 23, 11:28 pm, BrendanC bren...@gmail.com wrote:
OK - Quick follow up here - I was able to display an blob image using the
call:
def list_image():
myid = 1 # test
image=db(db.xim.id==myid).select(orderby=db.xim.title)
response.headers['Content-Type']='image/jpeg'
mystream = image.image_blob
return mystream
However this renders an image in separate page with no additional info.
What I really want is to display the stream as part of a template (within
a table) with additional related image info (Title, Comments etc). IOW I
want to embed the stream within an html template, rather than as a
separate, standalone file.
Am I missing piece of the puzzle here?
[web2py] Re: GAE - Rendering uploaded Blob as jpeg image rather than as a string?
You kind of do :) There is no way to embed streams in HTML directly. You
need a separate function showing a single image by id (e.g. /show_image/id)
and build a list with links to that function in the list_image view.
{{for img in images:}}
tr
{{= TD(img.title) }}
{{= TD(IMG(_src=URL(show_image, args=img.id), _alt=img.title)) }}
/tr
{{pass}}
[web2py] Re: GAE - Rendering uploaded Blob as jpeg image rather than as a string?
you need to set the response.header['Content-type']='image/jpeg' else the browser does not know what to do with the file. On Feb 23, 2:23 pm, BrendanC bren...@gmail.com wrote: I uploaded a small (1mb) jpeg image to my local dev app server. In this case the blob goes in the image file and is stored as a large string in an 'image_blob' field. However when I retrieve this image it is displayed as a string, rather than as an image. Is there something else I need to do here to render the blob correctly as a jpeg file - possibly some sort of special template tag or blob handler. Note: This is about in small (1mb) record/entity blobs. I'm *not* using the google blobstore here - just in case there is any confusion. Any working examples would be helpful here. TIA, BrendanC
[web2py] Re: GAE - Rendering uploaded Blob as jpeg image rather than as a string?
I thought the content type settings were handled automatically by the
framework.
Anyway - for some reason setting the response.headers to 'image/jpeg' does
not work - just get an empty/blank page.
I must be missing something else re handling gae blob properties - here's
my test code:
Any further suggestions?
Model:
# Image table - includes ref to image blob + lat/long for location/google
map
db.define_table(
'xim',
Field('title', unique=True),
Field('image','upload'),
Field('image_url'),
Field('modified_on','datetime',default=request.now,writable=False,readable=False)
)
Controller:
def list_images():
# Display Image as jpeg file - need to set HTTP Content type =
image/jpeg in view
images=db(db.xim.id0).select(orderby=db.xim.title)
response.headers['Content-Type']='image/jpeg'
return dict(images=images)
View:
{{extend 'layout.html'}}
h3Display Jpeg Images/h3
table border=1
tr
thImage Title/th
thImage Blob/th
/tr
{{for img in images:}}
tr
td{{ =img.title }}/td
td{{=img.image_blob }}//td
/tr
{{pass}}
/table
[web2py] Re: GAE - Rendering uploaded Blob as jpeg image rather than as a string?
OK - Quick follow up here - I was able to display an blob image using the call: def list_image(): myid = 1# test image=db(db.xim.id==myid).select(orderby=db.xim.title) response.headers['Content-Type']='image/jpeg' mystream = image.image_blob return mystream However this renders an image in separate page with no additional info. What I really want is to display the stream as part of a template (within a table) with additional related image info (Title, Comments etc). IOW I want to embed the stream within an html template, rather than as a separate, standalone file. Am I missing piece of the puzzle here?
