php - How to resize/crop or reduce the size of an image displayed from SQL Server query? -


i want minimize size of sql server image before gets loaded on clients.

unfortunately example not implemented: resizing , displaying blob element database

code:

<?php include "dbconf2.php";  $sqlimage=" select         f.grafik,         f.knr,         f.brstatus1,         f.untertitel1,         f.anzeigeweb1      foto f      f.knr 'fhtg20900%' ;";  $stmtimage = sqlsrv_query($connvhs, $sqlimage);  while ($result2=sqlsrv_fetch_array($stmtimage)) {              echo "titel: ".$result2['untertitel1']."<br>";             echo "knr: ".$result2['knr']."<br>";             echo "status: ".$result2['brstatus1']."<br>";             echo "web: ".$result2['anzeigeweb1']."<br>";             echo '<img src="data:image/jpeg;base64,'.base64_encode( $result2['grafik']).'" style="max-height: 500px; max-width: 400px;"/>'."<br>";             echo "<br>";  } ?>

edit: simple implementation:

$image = imagecreatefromstring(base64_encode( $result2['grafik'])); $image = imagescale($image, 100, 100);  ob_start(); imagejpeg($image); $contents = ob_get_contents(); ob_end_clean(); echo "<img src='data:image/jpeg;base64,".base64_encode($contents)."' />"; imagedestroy($image);

but these errors:

warning: imagecreatefromstring(): data not in recognized format ...

warning: imagescale() expects parameter 1 resource, boolean given in ...

warning: imagedestroy() expects parameter 1 resource, null given in ...

this might you,but have first create actual image sql. it's better if can save image file actual file.it far more faster.

function resize_image($filename, $tmpname, $xmax, $ymax)   {   $ext = explode(".", $filename);   $ext = $ext[count($ext)-1];    if($ext == "jpg" || $ext == "jpeg")       $im = imagecreatefromjpeg($tmpname);   elseif($ext == "png")       $im = imagecreatefrompng($tmpname);   elseif($ext == "gif")       $im = imagecreatefromgif($tmpname);    $x = imagesx($im);   $y = imagesy($im);    if($x <= $xmax && $y <= $ymax)       return $im;    if($x >= $y) {       $newx = $xmax;       $newy = $newx * $y / $x;   }   else {       $newy = $ymax;       $newx = $x / $y * $newy;   }    $im2 = imagecreatetruecolor($newx, $newy);   imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);   return $im2;    }

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more