[TYPO3-english] Get image data without actually showing the image

Wed Mar 17 10:33:22 CET 2010

jochem nabuurs wrote:
> jochem nabuurs wrote:
>> Hi list,
>>
>> I've created the following code for generating an image with a mask 
>> onto it, to use as a background for a website.
>>
>> // Fetch one random image from border column,
>> // apply a mask onto it, and use the url in the body tag
>> //
>> // In order for the code below to work, you need to set the following 
>>      // settings inside local_conf.php or change them through the 
>> installtool
>> // $TYPO3_CONF_VARS['GFX']['gdlib_png'] = '1';
>> // $TYPO3_CONF_VARS['GFX']['gdlib_2'] = '1';
>> // $TYPO3_CONF_VARS['GFX']['png_truecolor'] = '1';
>> // ---------------------------------------------------------------------
>>
>> temp.headerImage = CONTENT
>> temp.headerImage {
>>         // Fetch a random image from the database
>>     table= tt_content
>>     select {
>>         pidInList = 2
>>         max = 1
>>         where = CType='image'
>>         andWhere (
>>             colPos=3 AND
>>             image!=''
>>         )
>>         orderBy = rand()
>>     }
>>         // Generate a new image from the old one,
>>     // with a nice green gradient on top of it.
>>     renderObj = COA
>>     renderObj {
>>             // generate the image
>>         10 = IMAGE
>>         10 {
>>             params = style="display:none;"
>>                    file = GIFBUILDER
>>             file {
>>                 XY = 1000, 750
>>                 format = jpg
>>                 quality = 100
>>                               // get the original image
>>                 10 = IMAGE
>>                 10 {
>>                     file {
>>                         import = uploads/pics/
>>                         import.field = image
>>                         width = 1000
>>                         height = 750
>>                     }
>>                        offset = 0,0
>>                 }
>>                                15 = IMAGE
>>                 15 {
>>                     offset = 0,0
>>                     file = fileadmin/images/foto.png
>>                     file {
>>                         width = 1000
>>                         height = 750
>>                     }
>>                 }
>>             }
>>         }
>>                // Create the bodytag contents
>>         // With the TSFE:lastImageInfo object,
>>         // you've got access to the image data
>>         // Don't know exactly how this works.
>>         20 = TEXT
>>         20.dataWrap = <body id="home" style="background-image: 
>> url({TSFE:lastImageInfo|3});">
>>         20.insertData = 1
>>     }
>> }
>>
>>
>> page.234 < temp.headerImage
>>
>> page.bodyTagCObject = TEXT
>> page.bodyTagCObject < temp.headerImage.20
>>
>>
>> The above works perfect, but the "page.234" part outputs an image tag 
>> in the HTML code, which is not what i want. I've partially solved this 
>> with setting params = style="display:none;"  so the image isn't 
>> displayed.
>>
>> I'd like to remove the "page.234 < .." part but then the image object 
>> isn't available (or something like that) and with it, the 
>> lastImageInfo data.
>>
>> What I'd like to know is how to access the lastImageInfo object of the 
>> generated image, without having to output the actual image as a HTML 
>> element.
>>
>> Thanks in advance,
>>
>> Jochem Nabuurs
>>
>>
> 
> I've got an addition to the above:
> Within the CONTENT object, I use RAND() for selecting a random image.
> But when I view the result in the website, the image is only shown at 
> random when refreshing with crtl + f5.
> 
> I thought this was because the image is cached, so I modified the the 
> code so the headerImage should not be cached:
> 
> page.bodyTagCObject = COA_INT
> page.bodyTagCObject.10 < temp.headerImage.20
> 
> I've also changed renderObj to a COA_INT but these changes haven't got 
> any effect.
> 
> Can anybody tell me why the random function is not working?
> 
> Thanks in advance

Never mind:

temp.headerImage was a CONTENT object, so it is cached. Therefor the 
output of this object is cached, and therefor also the result of the 
rand function.

By changing the temp.headerImage to a COA_INT object with the CONTENT 
object inside, the CONTENT object is not cached anymore and the rand 
function is executed every time a refresh occurs...

Code example:
...
lib.headerImage = COA_INT
lib.headerImage.10 = CONTENT
lib.headerImage.10 {
    ...
}
...
page.234 < lib.headerImage
page.bodyTagCObject < lib.headerImage.20
...

Still wondering if there is a workaround for the page.234 thing...