stream

问题 I have created a buffer from a file which can be pdf, jpg or any other format. Now I want to detect if the buffer is of the pdf file or any other file. request({ url, encoding: null }, (err, resp, buffer) => { hashFromFilebuffer('sha256', buffer).then(function (result) { console.log(result) }).catch(function (error) { console.log(error) }); }); 回答1: Have a look at this: https://github.com/sindresorhus/file-type/ . If you want to know how it works, I think the code is at https://github.com

问题 I have created a buffer from a file which can be pdf, jpg or any other format. Now I want to detect if the buffer is of the pdf file or any other file. request({ url, encoding: null }, (err, resp, buffer) => { hashFromFilebuffer('sha256', buffer).then(function (result) { console.log(result) }).catch(function (error) { console.log(error) }); }); 回答1: Have a look at this: https://github.com/sindresorhus/file-type/ . If you want to know how it works, I think the code is at https://github.com

问题 Decoding a byte stream into a text stream is easy: import io f = io.TextIOWrapper(io.BytesIO(b'Test\nTest\n'), 'utf-8') f.readline() In this example, io.BytesIO(b'Test\nTest\n') is a byte stream and f is a text stream. I want to do exactly the opposite of that. Given a text stream or file-like object, I would like to encode it into a byte stream or file-like object without processing the entire stream . This is what I've tried so far: import io, codecs f = codecs.getreader('utf-8')(io

问题 I have about 500K rows I need to return from my database (please don't ask why). I will then need to save these results as XML (more URGH) and the ftp this file to somewhere magical. I also need to transform the each row in the result set. Right now, this is what I'm doing with say .. TOP 100 results: using Dapper's Query<T> method, which throws the entire result set into memory I then use AutoMapper to convert the database POCO to my FileResult POCO Convert to XML Then save this collection

问题 tl;dr I am currently attempting to get a screenshot using webshot and upload to Google Drive without saving the file to the filesystem as an intermediate step in the process. Any code--regardless of the approach--that will allow me to do this is most welcome!! What I've tried I was able to get the system to run locally by saving the file from webshot and then uploading that file to Google Drive, but this is not possible on the server environment I use (Elastic Beanstalk), and I would like to

问题 tl;dr I am currently attempting to get a screenshot using webshot and upload to Google Drive without saving the file to the filesystem as an intermediate step in the process. Any code--regardless of the approach--that will allow me to do this is most welcome!! What I've tried I was able to get the system to run locally by saving the file from webshot and then uploading that file to Google Drive, but this is not possible on the server environment I use (Elastic Beanstalk), and I would like to

问题 In Node.js, say that I want to read a file from somewhere and stream the response (e.g., from the filesystem using fs.createReadStream() ). application.get('/files/:id', function (request, response) { var readStream = fs.createReadStream('/saved-files/' + request.params.id); var mimeType = getMimeTypeSomehow(request.params.id); if (mimeType === 'application/pdf') { response.set('Content-Range', ...); response.status(206); } else { response.status(200); } readStream.pipe(response); }); However

问题 I was reading about AWS Kinesis . In the following program, I write data into the stream named TestStream . I ran this piece of code 10 times, inserting 10 records into the stream. var params = { Data: 'More Sample data into the test stream ...', PartitionKey: 'TestKey_1', StreamName: 'TestStream' }; kinesis.putRecord(params, function(err, data) { if (err) console.log(err, err.stack); // an error occurred else console.log(data); // successful response }); All the records were inserted

问题 I'm trying to make a (front-end) Javascript that would be able to copy very large files (i.e. read them from a file input element and 'download' them using StreamSaver.js). This is the actual code: <html> <header> <title>File copying</title> </header> <body> <script src="https://cdn.jsdelivr.net/npm/web-streams-polyfill@2.0.2/dist/ponyfill.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/streamsaver@2.0.3/StreamSaver.min.js"></script> <script type="text/javascript"> const

问题 I'm trying to make a (front-end) Javascript that would be able to copy very large files (i.e. read them from a file input element and 'download' them using StreamSaver.js). This is the actual code: <html> <header> <title>File copying</title> </header> <body> <script src="https://cdn.jsdelivr.net/npm/web-streams-polyfill@2.0.2/dist/ponyfill.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/streamsaver@2.0.3/StreamSaver.min.js"></script> <script type="text/javascript"> const