buffer

问题 I have to draw a buffer that holds a couple thousand vertices. I am using a vbo to store the data. I know I will have to update the VBO many times - but only in small parts at a time. So I am wondering what the best method to doing so is: Split VBO up into smaller VBOs (that hold like 300 verts) and then update individual VBOs with 1 call? One big VBO and use lots of glBufferSubData() calls? Use glMapBuffer() and one big VBO? 回答1: There is another option, which is a bit like option 3 - use

问题 I'm designing a Buffer class whose purpose is to represent a chunk of memory. My underlying buffer is a char* (well, a boost::shared_array<char> actually, but it doesn't really matter). I'm stuck at deciding what prototype to choose for my constructor: Should I go with: Buffer(const void* buf, size_t buflen); Or with: Buffer(const char* buf, size_t buflen); Or something else ? What is usually done, and why ? 回答1: API interface is more clear for user, if buffer has void* type, and string has

问题 A question already has been asked how to reload a .emacs file after changing it. The proposed solutions were to use M-x load-file or M-x eval-region RET on the changed region. Neither of these solutions affect other open buffers for me. Is there a way to reload the .emacs file for all open buffers? I should also note that the M-x load-file does not have the desired effect for reasons outlined in the comments to that answer. 回答1: Your .emacs file is a global configuration that gets evaluated

问题 I'm trying to take an image and upload it to an Amazon S3 bucket using Node.js. In the end, I want to be able to push the image up to S3, and then be able to access that S3 URL and see the image in a browser. I'm using a Curl query to do an HTTP POST request with the image as the body. curl -kvX POST --data-binary "@test.jpg" 'http://localhost:3031/upload/image' Then on the Node.js side, I do this: exports.pushImage = function(req, res) { var image = new Buffer(req.body); var s3bucket = new

问题 I'm trying to take an image and upload it to an Amazon S3 bucket using Node.js. In the end, I want to be able to push the image up to S3, and then be able to access that S3 URL and see the image in a browser. I'm using a Curl query to do an HTTP POST request with the image as the body. curl -kvX POST --data-binary "@test.jpg" 'http://localhost:3031/upload/image' Then on the Node.js side, I do this: exports.pushImage = function(req, res) { var image = new Buffer(req.body); var s3bucket = new

问题 From what I understood here, "V8 has a generational garbage collector. Moves objects aound randomly. Node can’t get a pointer to raw string data to write to socket." so I shouldn't store data that comes from a TCP stream in a string, specially if that string becomes bigger than Math.pow(2,16) bytes. (hope I'm right till now..) What is then the best way to handle all the data that's comming from a TCP socket ? So far I've been trying to use _:_:_ as a delimiter because I think it's somehow

问题 I want to send a raw buffer using bluetooth connection. The content is a hex number. Currently I split the number manually to an byte array. Is there any function that can help me convert the number to byte array? //var data = 0x250001000192CD0000002F6D6E742F72; var data = new Buffer([0x25,0x00,0x01,0x00,0x01,0x92,0xCD,0x00,0x00,0x00,0x2F,0x6D,0x6E,0x74,0x2F,0x72]); serialPort.write(data); 回答1: In new versions of node (6+) the new Buffer() interface is deprecated. Use: Buffer.from(

问题 How can I write df.info() to file? I would like to include this in a sheet of the excel file where I write my df to using df.to_excel . According to the docs (pandas.DataFrame.info) it returns a buf : writable buffer, defaults to sys.stdout 回答1: I would try the following: f = open('df.info', 'w+') df.info(buf=f) f.close() 来源： https://stackoverflow.com/questions/35436331/how-to-save-output-from-dataframe-info-to-file-a-excel-or-text-file

问题 I overheard an argument about System.out.print() today. One person claimed that since print() doesn't including the terminating \n , the buffer it writes to will eventually fill up and start losing data. The other person claimed that they had been using System.out.print() for all their Java programs and had never run into this issue. Is the first person right? Is it possible for System.out.print() to start blocking or dropping data if stdout is full? Is there an example of code that will

问题 I see the word "BUFFER" everywhere, but I am unable to grasp what it exactly is. Would anybody please explain what is buffer in layman's language ? When is it used? How is it used? 回答1: Imagine that you're eating candy out of a bowl. You take one piece regularly. To prevent the bowl from running out, someone might refill the bowl before it gets empty, so that when you want to take another piece, there's candy in the bowl. The bowl acts as a buffer between you and the candy bag. If you're