bytearray

问题 what is the easiest way to convert a Blob into a byte array?I am using MYSQL and i want to convert a Blob datatype into a byte array. Iam using java programming language:) 回答1: the mySql blob class has the following function : blob.getBytes use it like this: //(assuming you have a ResultSet named RS) Blob blob = rs.getBlob("SomeDatabaseField"); int blobLength = (int) blob.length(); byte[] blobAsBytes = blob.getBytes(1, blobLength); //release the blob and free up memory. (since JDBC 4.0) blob

问题 In a WebService JSON response is coming. In the response, there is image is coming as a byte array. I have to show the image in a UIImageView. I am trying to convert the byte array to NSData. But not getting how to do that. Any help would be appreciated. I am confident that the byte array has image data in it. Sample Byte array for your reference: (137, 80, 78, 71, ... 66, 96, 130) Thanks 回答1: You have to convert the JSON to an array of strings first; you can, for example, use the

问题 Is this the recommended way to get the bytes from the ByteBuffer ByteBuffer bb =.. byte[] b = new byte[bb.remaining()] bb.get(b, 0, b.length); 回答1: Depends what you want to do. If what you want is to retrieve the bytes that are remaining (between position and limit), then what you have will work. You could also just do: ByteBuffer bb =.. byte[] b = new byte[bb.remaining()] bb.get(b); which is equivalent as per the ByteBuffer javadocs. 回答2: Note that the bb.array() doesn't honor the byte

问题 I'm using Filestream for read big file (> 500 MB) and I get the OutOfMemoryException. Any solutions about it. My Code is: using (var fs3 = new FileStream(filePath2, FileMode.Open, FileAccess.Read)) { byte[] b2 = ReadFully(fs3, 1024); } public static byte[] ReadFully(Stream stream, int initialLength) { // If we've been passed an unhelpful initial length, just // use 32K. if (initialLength < 1) { initialLength = 32768; } byte[] buffer = new byte[initialLength]; int read = 0; int chunk; while (

问题 We know that String.utf16 provides the codeunits or String.unicodeScalars provides the scalars. If we manipulate the codeunits and unicodeScales by removing some elements etc. is there a way to construct back the resulting string? 回答1: Update for Swift 2.1: You can create a String from an array of UTF-16 characters with the public init(utf16CodeUnits: UnsafePointer<unichar>, count: Int) initializer. Example: let str = "H€llo 😄" // String to UTF16 array: let utf16array = Array(str.utf16) print

问题 We know that String.utf16 provides the codeunits or String.unicodeScalars provides the scalars. If we manipulate the codeunits and unicodeScales by removing some elements etc. is there a way to construct back the resulting string? 回答1: Update for Swift 2.1: You can create a String from an array of UTF-16 characters with the public init(utf16CodeUnits: UnsafePointer<unichar>, count: Int) initializer. Example: let str = "H€llo 😄" // String to UTF16 array: let utf16array = Array(str.utf16) print

问题 i am making application in c#.In that application i have byte array containing hex values. Here i am getting data as a big endian but i want it as a little endian. Here i am using Bitconverter.toInt32 method for converting that value to integer. But my problem is that before converting value,i have to copy that 4 byte data into temporary array from source byte array and then reverse that temporary byte array. I cant reverse source array because it contains other data also. Because of that my

问题 I have problem very similar to this PDF Blob - Pop up window not showing content, but I am using Angular 2. The response on question was to set responseType to arrayBuffer, but it not works in Angular 2, the error is the reponseType does not exist in type RequestOptionsArgs. I also tried to extend it by BrowserXhr, but still not work (https://github.com/angular/http/issues/83). My code is: createPDF(customerServiceId: string) { console.log("Sending GET on " + this.getPDFUrl + "/" +

问题 Can someone tell me the code to convert image into byte array and that byte array into base64 string. i write the below code not getting proper result . String filepath = "/sdcard/Image/ic_launcher.jpg"; File imagefile = new File(filepath); FileInputStream fis = null; try { fis = new FileInputStream(imagefile); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } Bitmap bm = BitmapFactory.decodeStream(fis); ByteArrayOutputStream baos = new

问题 I have a web server which will read large binary files (several megabytes) into byte arrays. The server could be reading several files at the same time (different page requests), so I am looking for the most optimized way for doing this without taxing the CPU too much. Is the code below good enough? public byte[] FileToByteArray(string fileName) { byte[] buff = null; FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); long numBytes