blob

问题 I followed this article (the code up to step 6) to make an audio recorder as below. After making the audioBlob , I call a custom function to upload the blob. This function works for other file types. I pass { type: 'audio/wav' } to the Blob constructor. The resulting file indeed pretends to be a wave file, and would play fine in the browser, but not on iOS. I checked with http://checkfiletype.com/ and discovered the file was actually WebM: How do I ensure the file is in fact a .wav file? The

问题 I am trying to take the screenshot/snapshot of the full webpage using native javascript that should support all browsers.I have seen that using blob can achieve this but it cannot save to local file directory unless we use HTML5 File APIs.Am not sure how supportive it could be.So thinking of sending this blob data to server side for further processing using java File APIs and save it.I tried the below code which uses blob to clone the webpage. urlsToAbsolute(document.images); urlsToAbsolute

问题 When I try to use DBMS_LOB.convertToBlob procedure multiple times in the same PLSQL block only the first execution works as expected. All additional executions produce empty blobs. Here is an example: DECLARE v_temp1 varchar2(32767) := 'absd'; V_temp1_blob BLOB; V_temp2 varchar2(32767) := 'efghi'; V_temp2_blob BLOB; v_in integer := 1; v_out integer := 1; v_lang integer := 0; v_warning integer := 0; BEGIN DBMS_LOB.createTemporary (V_temp1_blob, TRUE); DBMS_LOB.convertToBlob(V_temp1_blob, V

问题 got a little problem im hoping someone can enlighten me on. Trying to serialise a Java Object of my own creation which is made up of other Java Objects (Again of my own creation). It was running fine until I get this error when the jdbc attempts to run the PreparedStatement storing the Object as a blob. Im running MySQL as the database and have checked that all my objects which im attempting to store in the blob field are defined as "implements Serializable". I have attempted to try a normal

问题 I am working on a project that needs migration of existing Oracle blobs into files. The environment to read from is a shared Oracle 10gR2 server. Currently I have a script using UTL_FILE. However, the process is pretty slow. It takes around 3 hours to extract 25 GB of sample data. The actual data to be moved is in the order of 1 TB. I need help/advice in tuning this significantly. Here is my process: Open a cursor to fetch the list of blob ids and names Start a loop to go thru each blob

问题 I'm trying for 2 days to find a way to retrieve some images from a database. They are saved as a binary string (I read the term somewhere, but frankly never heard before). Most of the images are in .jpeg format and is easy to get and save to a file. but my problem is the .bmp images. For some reason i can't show then. For now, i'm using a simple code just to get the image and save it to a file: $img = $row['image']; file_put_contents("file.jpeg", $img); //Doesn't matter what format i put

问题 I'm trying to upload a blob URL generated by getUserMedia to the server. Someone else wanted to do the same thing, and that question has been answered. I am using the same code for the XHR request as the person who answered that question, but I'm getting a 404. I made a fiddle, and the same thing happens when you look at the console. I have a live example on my site as well, and the same thing happens. Here is the piece of code that needs some TLC: function XHR(){ var xhr = new XMLHttpRequest

问题 I need to display a CLOB field with longer than 4000 characters in a text field using in iReport. I am using iReport version 5.5.0, I tried converting the CLOB to InputStream but it did not work, all I get is: java.io.ByteArrayInputStream@43842a66 I tried getSubString(long,int) but it only works for strings smaller than 4000 chars. stringValue() and toString() also did not work. Thanks for any help. EDIT: Clob.getSubString(long,int) method worked fine in my latter tests, I don't know why it

问题 I have a table in which I have a blob column containing some data, how can i download the blob content in django? I tried the solution mentioned here but it didn't work for me 回答1: def download_blob(request, id): contents = BlobModel.objects.get(id=id).blob_field response = HttpResponse(contents) response['Content-Disposition'] = 'attachment; filename=blob.bin' return response 来源： https://stackoverflow.com/questions/17923139/how-to-download-data-in-a-blob-field-from-database-in-django

问题 I've got some problems about to fileinputjs.The images' src are blob.But i want to use images' src to do something.So i use readAsDataURL to get base64.But there are any problems about it 。 <script type="text/javascript"> $("#last").click(function(){ var blob=document.querySelector(".file-preview-image").src; var reader = new FileReader(); //通过 FileReader 读取blob类型 reader.onload = function(){ this.result === dataURI; //base64编码 } console.log(reader.readAsDataURL(blob)); }) </script> Then there