binary-data

问题 If I have a class declared as: public class MyPersistentClass { public int ID { get; set; } public Stream MyData {get;set; } } How can I use NHibernate's mappings to persist the MyData property to and from the database? 回答1: You could use a Stream using a custom type and map it according to your storage needs. But there are some issues with using the Stream object as I mention in my blog series about lazy streaming of BLOBs and CLOBs with NHibernate. What you really need is a Blob object that

问题 So, I created a binary file with fortran, using something similar to this: open (3,file=filename,form="unformatted",access="sequential") write(3) matrix(i,:) The way I understand it, fortran pads the file with 4 bytes on either end of the file, and the rest is just the data that I want (in this case, a list of 1000 doubles). I want to read this in with gnuplot, however, I don't know how to get gnuplot to skip the first and last 4 bytes, and read the rest in as doubles. The documentation isn't

问题 I am looking for suggestions on the best way to send/receive data from a remote GPRS device, over port 80. Creating a plain TCP socket on a random port works fine, but many carriers only allow port 80 HTTP traffic through their proxies, and then expect HTTP ascii data (for which they can modify headers as needed. So, should my device create a POST request on a persistent http connection, and then receive a base64 encoded response from the web service? I am not sure how mobile proxies behave

问题 I have a simple binary vector a which I try to translate into vector b using the R function cumsum . However, cumsum does not exactly return vector b . Here is an example: a <- c(1,0,0,0,1,1,1,1,0,0,1,0,0,0,1,1) b <- c(1,2,2,2,3,4,5,6,7,7,8,9,9,9,10,11) > cumsum(a) [1] 1 1 1 1 2 3 4 5 5 5 6 6 6 6 7 8 The problem is that whenever a 0 appears in vector a then the previous number should be increased by 1 but only for the first 0. The remaining ones are given the same value. Any advise would be

问题 I need to save a large set of client-side generated data (binary) to the client system. I looked at creating a Data URI, but the datasize is large (an app-generated image PDF files of 100+ pages). Is there some other way to do this other than a Data URI? Thanks! 回答1: If you want to start a download this is the way to go: If you have more than one file to save: Pack it into a zip file. I wrote a dart based zip library (available at https://github.com/roberthartung/zip.dart). They key point is

问题 I have a binary file with "messages" and I am trying to fit the bytes inside the right variable using structs. In my example I used two types of messages: Tmessage and Amessage. #include <iostream> #include <fstream> #include <stdlib.h> #include <string> #include <iomanip> using namespace std; struct Tmessage { unsigned short int Length; char MessageType; unsigned int Second; }; struct Amessage { unsigned short int Length; char MessageType; unsigned int Timestamp; unsigned long long int

问题 I'm writing a client for a server program written in C++. As is not unusual, all the networking protocol is in a format where packets can be easily memcopied into/out of a C++ structure (1 byte packet code, then different arrangements per packet type). I could do the same thing in C#, but is there an easier way, especially considering lots of the data is fixed-length char arrays that I want to play with as strings? Or should I just suck it up and convert types as needed? I've looked at using

问题 I have got a binary file. I have no clue how to read this binary file using C#. The definition of the records in the binary file as described in C++ is: #define SIZEOF_FILE(10*1024) //Size of 1234.dat file is: 10480 + 32 byte (32 = size of file header) typedef struct FileRecord { WCHAR ID[56]; WCHAR Name[56]; int Gender; float Height; WCHAR Telephne[56]; and........ } How do I read a binary file containing those records in C# and write it back after editing it? 回答1: There's actually a nicer

问题 I have got a binary file. I have no clue how to read this binary file using C#. The definition of the records in the binary file as described in C++ is: #define SIZEOF_FILE(10*1024) //Size of 1234.dat file is: 10480 + 32 byte (32 = size of file header) typedef struct FileRecord { WCHAR ID[56]; WCHAR Name[56]; int Gender; float Height; WCHAR Telephne[56]; and........ } How do I read a binary file containing those records in C# and write it back after editing it? 回答1: There's actually a nicer

问题 I have some tables in MySQL 5.6 that contain large binary data in some fields. I want to know if I can trust dumps created by mysqldump and be sure that those binary fields will not be corrupted easily when transferring the dump files trough systems like FTP, SCP and such. Also, should I force such systems to treat the dump files as binary transfers instead of ascii? Thanks in advance for any comments! 回答1: No, it is not always reliable when you have binary blobs. In that case you MUST use