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我試圖從Flex（PNG圖像）上傳動態生成的文件到Ruby on Rails服務器後端，使用以下代碼（從Flex on Rails圖書）：嘗試從Flex上傳文件到Rails（使用回形針）時的異常
public function save():void
{
var bitmapData:BitmapData = new BitmapData(width, height);
bitmapData.draw(this);
var ba:ByteArray = (new PNGEncoder()).encode(bitmapData);
var fileRef:FileReference = new FileReference();
//TODO: Remove HardCoding of URL here
var request : URLRequest = new URLRequest("http://localhost:3000/doodles");
request.method = URLRequestMethod.POST;
var boundary : String = "----------Ij5GI3GI3ei4GI3ei4KM7GI3KM7KM7";
request.contentType = "multipart/form-data; boundary=" + boundary;
request.data =getMultiPartRequestData(boundary,'doodle','',ba);
loader.load(request);
}
和getMultiPartRequestData功能是：
private function getMultiPartRequestData(boundary:String,
resourceName:String,
filename:String,
bytes:ByteArray):ByteArray {
Alert.show("haha");
var lf:String = "\r\n";
var part1:String = '--' + boundary + lf +
'Content-Disposition: form-data; name="Filename"' + lf + lf +
'{0}' + lf +
'--' + boundary + lf ;
if (_model.authenticityToken != "") {
part1 += 'Content-Disposition: form-data; name="authenticity_token";' + lf + lf +
'{2}' + lf +
'--' + boundary + lf ;
}
part1 += 'Content-Disposition: form-data; name="{1}[x]";' + lf + lf +
'{3}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[y]";' + lf + lf +
'{4}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[width]";' + lf + lf +
'{5}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[height]"' + lf + lf +
'{6}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[rotation]"' + lf + lf +
'{7}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[day_id]"' + lf + lf +
'{8}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[privacy]"' + lf + lf +
'{9}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[canvas_height]"' + lf + lf +
'{10}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[canvas_width]"' + lf + lf +
'{11}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="commit"' + lf + lf +
'Create' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[photo]";' +
'filename="{0}"' + lf +
'Content-Type: application/octet-stream' + lf + lf
var part2:String = '--' + boundary + lf +
'Content-Disposition: form-data; name="Upload"' + lf + lf +
'Submit Query' + lf +
'--' + boundary + '--'
var result:ByteArray = new ByteArray();
// Filling in the parameters as per comment above
result.writeMultiByte(StringUtil.substitute(part1,
filename,
resourceName,
_model.authenticityToken,
_model.boundMinX,
_model.boundMinY,
Constants.DEFAULT_DOODLE_WIDTH,
Constants.MINIMUM_CANVAS_HEIGHT,
0,
_model.current_day.id,
privacyGroup.selectedValue.toString(),
FlexGlobals.topLevelApplication.height,
FlexGlobals.topLevelApplication.width), "ascii");
result.writeBytes(bytes,0,bytes.length);
result.writeMultiByte(part2, "ascii");
return result;
}
我得到以下異常：
TypeError (can't convert nil into String):
vendor/plugins/paperclip/lib/paperclip/iostream.rb:8:in `extname'
vendor/plugins/paperclip/lib/paperclip/iostream.rb:8:in `to_tempfile'
vendor/plugins/paperclip/lib/paperclip/attachment.rb:89:in `assign'
vendor/plugins/paperclip/lib/paperclip.rb:262:in `block in has_attached_file'
activerecord (2.3.5) lib/active_record/base.rb:2746:in `block in attributes='
activerecord (2.3.5) lib/active_record/base.rb:2742:in `each'
activerecord (2.3.5) lib/active_record/base.rb:2742:in `attributes='
activerecord (2.3.5) lib/active_record/base.rb:2438:in `initialize'
app/controllers/doodles_controller.rb:16:in `new'
app/controllers/doodles_controller.rb:16:in `create'
actionpack (2.3.5) lib/action_controller/base.rb:1331:in `perform_action'
actionpack (2.3.5) lib/action_controller/filters.rb:617:in `call_filters'
actionpack (2.3.5) lib/action_controller/filters.rb:610:in `perform_action_with_filters'
actionpack (2.3.5) lib/action_controller/benchmarking.rb:68:in `block in perform_action_with_benchmark'
activesupport (2.3.5) lib/active_support/core_ext/benchmark.rb:17:in `block in ms'
/Users/tammam56/.rvm/rubies/ruby-1.9.1-p378/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'
activesupport (2.3.5) lib/active_support/core_ext/benchmark.rb:17:in `ms'
actionpack (2.3.5) lib/action_controller/benchmarking.rb:68:in `perform_action_with_benchmark'
actionpack (2.3.5) lib/action_controller/rescue.rb:160:in `perform_action_with_rescue'
actionpack (2.3.5) lib/action_controller/flash.rb:146:in `perform_action_with_flash'
vendor/plugins/newrelic_rpm/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:253:in `block in perform_action_with_newrelic_trace'
vendor/plugins/newrelic_rpm/lib/new_relic/agent/method_tracer.rb:141:in `trace_execution_scoped'
vendor/plugins/newrelic_rpm/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:246:in `perform_action_with_newrelic_trace'
actionpack (2.3.5) lib/action_controller/base.rb:532:in `process'
actionpack (2.3.5) lib/action_controller/filters.rb:606:in `process_with_filters'
actionpack (2.3.5) lib/action_controller/base.rb:391:in `process'
actionpack (2.3.5) lib/action_controller/base.rb:386:in `call'
actionpack (2.3.5) lib/action_controller/routing/route_set.rb:437:in `call'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:87:in `dispatch'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:121:in `_call'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:130:in `block in build_middleware_stack'
activerecord (2.3.5) lib/active_record/query_cache.rb:29:in `call'
activerecord (2.3.5) lib/active_record/query_cache.rb:29:in `block in call'
activerecord (2.3.5) lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
activerecord (2.3.5) lib/active_record/query_cache.rb:9:in `cache'
activerecord (2.3.5) lib/active_record/query_cache.rb:28:in `call'
activerecord (2.3.5) lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
actionpack (2.3.5) lib/action_controller/string_coercion.rb:25:in `call'
rack (1.0.1) lib/rack/head.rb:9:in `call'
rack (1.0.1) lib/rack/methodoverride.rb:24:in `call'
actionpack (2.3.5) lib/action_controller/params_parser.rb:15:in `call'
actionpack (2.3.5) lib/action_controller/session/cookie_store.rb:93:in `call'
actionpack (2.3.5) lib/action_controller/failsafe.rb:26:in `call'
rack (1.0.1) lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:8:in `synchronize'
rack (1.0.1) lib/rack/lock.rb:11:in `call'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:114:in `block in call'
actionpack (2.3.5) lib/action_controller/reloader.rb:34:in `run'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:108:in `call'
rails (2.3.5) lib/rails/rack/static.rb:31:in `call'
rack (1.0.1) lib/rack/urlmap.rb:46:in `block in call'
rack (1.0.1) lib/rack/urlmap.rb:40:in `each'
rack (1.0.1) lib/rack/urlmap.rb:40:in `call'
rails (2.3.5) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.0.1) lib/rack/content_length.rb:13:in `call'
rack (1.0.1) lib/rack/chunked.rb:15:in `call'
rack (1.0.1) lib/rack/handler/mongrel.rb:64:in `process'
mongrel (1.1.5) lib/mongrel.rb:159:in `block in process_client'
mongrel (1.1.5) lib/mongrel.rb:158:in `each'
mongrel (1.1.5) lib/mongrel.rb:158:in `process_client'
mongrel (1.1.5) lib/mongrel.rb:285:in `block (2 levels) in run'
當我看着請求數據，我得到以下幾點：
Processing DoodlesController#create (for 127.0.0.1 at 2010-06-28 22:51:57) [POST]
Parameters: {"Filename"=>"doodle.png", "authenticity_token"=>"4UoCgzNbH1UccJbqV4P+R1mCuLk54fWTXxkZvVBin+I=", "doodle"=>{"x"=>"0", "y"=>"100", "width"=>"1024", "height"=>"768", "rotation"=>"0", "day_id"=>"16", "privacy"=>"meonly", "canvas_height"=>"1298", "canvas_width"=>"2560", "photo"=>#<File:/var/folders/RH/RHekFGKME9uDJbX4d4DG3E+++TI/-Tmp-/RackMultipart20100628-1685-1v2epqd-0>}, "commit"=>"Create"}
這非常類似於HTML請求數據（如果我使用HTML頁面的Flex代替）：
Processing DoodlesController#create (for 127.0.0.1 at 2010-06-28 21:55:23) [POST]
Parameters: {"authenticity_token"=>"4UoCgzNbH1UccJbqV4P+R1mCuLk54fWTXxkZvVBin+I=", "doodle"=>{"privacy"=>"myonly", "day_id"=>"1", "x"=>"10", "y"=>"10", "width"=>"1000", "height"=>"1000", "rotation"=>"0", "canvas_height"=>"1000", "canvas_width"=>"1000", "photo"=>#<File:/var/folders/RH/RHekFGKME9uDJbX4d4DG3E+++TI/-Tmp-/RackMultipart20100628-1685-1gnfm5q-0>}, "commit"=>"Create"}
其中工程！
，如果我（在Mac）型
open /var/folders/RH/RHekFGKME9uDJbX4d4DG3E+++TI/-Tmp-/RackMultipart20100628-1685-1v2epqd-0
（用於臨時文件），它打開了預期的PNG文件！
有關我如何使其工作的任何建議？
我不知道答案，但您是否嘗試從flex發佈二進制字符串並將其寫入RoR端的文件？ – Amarghosh 2010-06-29 08:54:18
謝謝@Amarghosh你如何建議我這樣做？ – Tam 2010-06-30 04:39:13
將原始BitmapData或png編碼的ByteArray轉換爲字符串並使用urlloader發送它。如果你發送位圖數據，你必須在服務器端使用png編碼器。一個問題可能是數據的長度可能比http post所允許的長。 – Amarghosh 2010-06-30 06:05:23