bytearray

问题 I have troubles saving a byte array to my Informix database, I'll show you how I'm trying: In Fichero.java among other things I have this: @Column(name="fichero", columnDefinition="blob") private byte[] contenido; I had to do that way because I can't get Informix+Hibernate to accept @Lob annotation (yes, I tried that extending Hibernate's dialect workaround but it doesn't work for me) Then I read a file and convert it to a bytearray this way: FileManager.java private byte[] fromFile2ByteArray

问题 I have a following problem - I'm trying to save byte[] to database and I just figured out that it works for one byte only. I have number of floats that I convert to byte[] and use that as a parameter: param = new SqlParameter(name, type, ((byte[])value).Length); type is VarBinary , value is the byte array. I add that parameter to my SqlCommand and just before it gets executed the whole byte array "sits" in that parameter and _msize of that parameter is correct (20 for 20 bytes I assume is

问题 I'm trying to convert -101 to a byte array and then convert the byte array back to -101 . My methods below work for positive values but not for negative values. Can you suggest what I'm doing wrong? Instead of -101 , the byteArrayToInt method returns 65435 . Thanks! /** * Converts a <code>byte</code> array to a 32-bit <code>int</code>. * * @param array The <code>byte</code> array to convert. * @return The 32-bit <code>int</code> value. */ public static int byteArrayToInt(byte[] array) {

问题 I'm building a small app using C#/WPF. The application receives (from an unmanaged C++ library) a byte array (byte[]) from a bitmap source In my WPF window, I have an (System.windows.Controls.Image) image which I will use to display the bitmap. In the code behind (C#) I need to able to take that byte array, create BitmapSource /ImageSource and assign the source for my image control. // byte array source from unmanaged librariy byte[] imageData; // Image Control Definition System.Windows

问题 I'm building a small app using C#/WPF. The application receives (from an unmanaged C++ library) a byte array (byte[]) from a bitmap source In my WPF window, I have an (System.windows.Controls.Image) image which I will use to display the bitmap. In the code behind (C#) I need to able to take that byte array, create BitmapSource /ImageSource and assign the source for my image control. // byte array source from unmanaged librariy byte[] imageData; // Image Control Definition System.Windows

问题 I am attempting a proof of concept under very constrained technological conditions. My question is: how to efficiently subtract big integers (represented as byte arrays) in a Java Card? . Now, the details are what make the task tricky. I have access to one smart card. The model is Feitian JavaCOS A22 and runs Java Card 2.2. For full detail, Java Card enables the usage of a very restricted subset of the Java API ( namely, no int , no char , and naturally, no BigInteger ), but it does support a

问题 I'll start by saying is going to be a little tougher than blindly joining byte[] together. My big picture goal is to optimize an application that currently uploads many 512byte pages to a web server (Azure Page Blob), and reduce that to a single large upload of 4Megs or less. See the links at the bottom of this question for more background as to why. The short answer to why: This optimization will increase speed (fewer IOs) and save money over the long term by using Azure sparse files Now for

问题 I have many hexcodes here and I want to get them into Java without appending 0x to every entity. Like: 0102FFAB and I have to do the following: byte[] test = {0x01, 0x02, 0xFF, 0xAB}; And I have many hexcodes which are pretty long. Is there any way to make this automatically? 回答1: You could try and put the hex codes into a string and then iterate over the string, similar to this: String input = "0102FFAB"; byte[] bytes = new byte[input.length() / 2]; for( int i = 0; i < input.length(); i+=2)

问题 I have an application that communicates with a thermal printer in Java and makes the thermal printer print receipts with a barcode/emphasis/different sizes and so forth using a Star tsp 100 Printer. I can make the program print exaclty what i like but the printer is very slow. I believe the reason is that I am using non-preferable way/method of sending the byte commands. public static void Command(byte[] bytes) throws Exception{ //The bytes array is the argument, consisting of a byte[] array

问题 I want to convert FileOutputStream to Byte array for passing binary data between two applications. please any one can help? 回答1: To convert a file to byte array, ByteArrayOutputStream class is used. This class implements an output stream in which the data is written into a byte array. The buffer automatically grows as data is written to it. The data can be retrieved using toByteArray() and toString(). To convert byte array back to the original file, FileOutputStream class is used. A file