binaryfiles | 易学教程

How to parse into base64 string the binary image from response?

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问题 I want to parse the requested image from my REST API into base64 string. Firstly... I thought, it would be easy, just to use window.btoa() function for this aim. When I try to do it in such part of my application: .done( function( response, position ) { var texture = new Image(); texture.src = \"data:image/png;base64,\" + window.btoa( response ); I\'ve got the next error: Uncaught InvalidCharacterError: Failed to execute \'btoa\' on \'Window\': The string to be encoded contains characters

Read binary file into a struct

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问题 I\'m trying to read binary data using C#. I have all the information about the layout of the data in the files I want to read. I\'m able to read the data \"chunk by chunk\", i.e. getting the first 40 bytes of data converting it to a string, get the next 40 bytes. Since there are at least three slightly different version of the data, I would like to read the data directly into a struct. It just feels so much more right than by reading it \"line by line\". I have tried the following approach

C write in the middle of a binary file without overwriting any existing content

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问题 Today\'s problem is that I need to write an array of numbers in a binary file at a starting position. I have the position where it should start, and I don\'t want to overwrite values after that, just want to insert the array at the starting position in the file. E.g: 12345 Let\'s push 456 at position 2: 12456345 I know that probably I\'ll have to implement it by myself, but I want to know what\'s your opinion on how to implement that as efficiently as possible. 回答1: Here's a function extend

Unexpected “padding” in a Fortran unformatted file

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问题 I don\'t understand the format of unformatted files in Fortran. For example: open (3,file=filename,form=\"unformatted\",access=\"sequential\") write(3) matrix(i,:) outputs a column of a matrix into a file. I\'ve discovered that it pads the file with 4 bytes on either end, however I don\'t really understand why, or how to control this behavior. Is there a way to remove the padding? 回答1: For unformated IO, Fortran compilers typically write the length of the record at the beginning and end of

php: recreate and display an image from binary data

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问题 Is it possible to recreate images from binary data (process them if needed) and display them, all in the same script? Something like // get and display image 1: $imagedata1 = file_get_contents(\'assets/test.png\'); $imagedata1 = process_using_gd_or_something($imagedata1); echo \"<img src={$imagedata1} >\"; // <-- IS THIS (OR EQUIVALENT) POSSIBLE? // get and display image 2: //etc... I want to avoid storing the images to to disk after processing and getting them from there, or using an

Managing large binary files with Git

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问题 I am looking for opinions of how to handle large binary files on which my source code (web application) is dependent. We are currently discussing several alternatives: Copy the binary files by hand. Pro: Not sure. Contra: I am strongly against this, as it increases the likelihood of errors when setting up a new site/migrating the old one. Builds up another hurdle to take. Manage them all with Git . Pro: Removes the possibility to \'forget\' to copy a important file Contra: Bloats the

Fortran unformatted file format

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I don't understand the format of unformatted files in fortran. For example: open (3,file=filename,form="unformatted",access="sequential") write(3) matrix(i,:) outputs a column of a matrix into a file. I've discovered that it pads the file with 4 bytes on either end, however I don't really understand why, or how to control this behavior. Is there a way to remove the padding? Thanks For unformated IO, Fortran compilers typically write the length of the record at the beginning and end of the record. Most but not all compilers use four bytes. This aids in reading records, e.g., length at the end