android - PHP base64 how to turn into image for insertion into database -


okay i've got android app image php web service.

i have decoded base64 string using base64_decode(). when execute sql query insert data database script inserts string \x5265736f75726365206964202333.

what want know how can modify code turn string image , insert postgresql database has utf8 encoding , bytea data column type store image.

php script

header('content-type: text/plain; charset=utf-8'); $conn = pg_connect("database_string");   /* data */ $name = $_post['name']; $s_name = pg_escape_string($name); $description = $_post['desc'];   $s_desc = pg_escape_string($description); $latitude = $_post['lat']; $longitude = $_post['lng']; $project = $_post['project'];  $encoded_photo = $_post['snap']; $photo = base64_decode($encoded_photo); header('content-type: image/jpeg; charset=utf-8'); $file = fopen('uploaded_image.jpg', 'wb'); fwrite($file, $photo); fclose($file);   /* insert database */ $res = pg_query("insert records (photo, name, description, latitude, longitude, project) values ('$file', '$s_name', '$s_desc', '$latitude', '$longitude', '$project')");

i know i'm close intended solution. think inserting decoded base64 string , inserting missing final step convert original image taken android app. apologies newness android dev'ing.

this part:

$file = fopen('uploaded_image.jpg', 'wb'); fwrite($file, $photo); fclose($file);   /* insert database */ $res = pg_query("insert records (photo, name, description, latitude, longitude, project) values ('$file', '$s_name', '$s_desc', '$latitude', '$longitude', '$project')");

makes no sense. you're inserting php filehandle. it's being converted string resource id #3 php converted bytea. not want.

it's totally unnecessary write data file in first place, since have in memory. use parameterised queries (you should always use parameterised queries) , let db driver take care of via pg_query_params:

$res = pg_query_params(        'insert records (photo, name, description, latitude, longitude, project) values ($1, $2, $3, $4, %6, $6)',        array( pg_escape_bytea($photo), $s_name, $s_desc, $latitude, $longitude, $project) );

see the docs on pg_query_params.

regarding bytea escapes see pg_escape_bytea , pg_unescape_bytea. note these functions pretty behind times , may not recognise hex escapes correctly on output; if have issues, issue sql command set bytea_output = 'escape'; before trying fetch values pg_unescape_bytea.

what php should really doing using fact data type of query's first parameter bytea infer must insert $photo raw bytes rather text. comment sounds not smart enough this.

btw, need read this website understand on reason why parameterized statements should always used. see sql injection , the php manual on sql injection. in addition being more secure, parameterised statements easier right , faster.


Comments

Post a Comment

Popular posts from this blog

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle);
Read more

Trying to import CSV file to a SQL Server database using asp.net and c# - can't find what I'm missing -

i student , quite new programming, , given task using asp.net , c#, without being taught either. plan learn teach ourselves. the task stuck on making website import csv file sql server database of last year's room bookings around campus. the table has following columns: request_id; priority; module_id; day; start_time; length; park; students; room_code; status; semester_id; linked_request; week_1; week_2; week_3; week_4; week_5; week_6; week_7; week_8; week_9; week_10; week_11; week_12; week_13; week_14; week_15; ) in code, try make work 3 columns (request_id,priority,module) starters. when press import button, want read .csv file (with fixed name @ fixed directory) eg "1,2,3" - comma separating fields [delimiter] - , import sql server datab
Read more