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  • How to change size of STL container in C++

    - by Jaime Pardos
    I have a piece of performance critical code written with pointers and dynamic memory. I would like to rewrite it with STL containers, but I'm a bit concerned with performance. Is there a way to increase the size of a container without initializing the data? For example, instead of doing ptr = new BYTE[x]; I want to do something like vec.insert(vec.begin(), x, 0); However this initializes every byte to 0. Isn't there a way to just make the vector grow? I know about reserve() but it just allocates memory, it doesn't change the size of the vector, and doesn't allows me to access it until I have inserted valid data. Thank you everyone.

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  • converting from int to hex

    - by Catherine
    I want to convert some ints to hex,but i'm getting something like this : "?|???plL4?h??N{" from 12345. Why? int t = 12345; System.Security.Cryptography.MD5CryptoServiceProvider ano = new System.Security.Cryptography.MD5CryptoServiceProvider(); byte[] d_ano = System.Text.Encoding.ASCII.GetBytes(t.ToString()); byte[] d_d_ano = ano.ComputeHash(d_ano); string st_data1 = System.Text.Encoding.ASCII.GetString(d_d_ano); string st_data = st_data1.ToString(); I'm using it in window form,not in console.

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  • Interconnecting Emulator Instances Android

    - by blah01
    Hi all I want to communicate two emulators via DatagramSocket in Android. Each of them is a Node in a P2P system. Thus each of them has a server Thread and client Thread (created per GUI event). This is how I create server public static final String SERVERIP = "10.0.2.15"; //... run() { InetAddress serverAddr = InetAddress.getByName(SERVERIP); DatagramSocket socket = new DatagramSocket(SERVERPORT,serverAddr); while(true) { byte[] buf = new byte[29]; DatagramPacket packet = new DatagramPacket(buf, buf.length); socket.receive(packet); //... } } The port is given by the user during initializing application. The client part (requesting some data) InetAddress serverAddr = InetAddress.getByName("10.0.2.2"); //... Log.i("Requester", "Trying to connect to device port = "+target); DatagramSocket socketJ = new DatagramSocket(); byte[] bufJ = Adaptor.createStringMsg(Adaptor.createJoingMsg(id, Location.getX(), Location.getY())).getBytes(); DatagramPacket packetJ = new DatagramPacket(bufJ, bufJ.length, serverAddr, target); Log.i("Requester", "Sending: '" + new String(bufJ) + "'"); socketJ.send(packetJ); Log.i("Requester", "Done."); Some additional info. The Node1 (emulatorA) has a server on port 8000 and Node2 (emulatorB) has a server on port 8001. The target port for "client part" is read properly. What tried to do is to set the redirection as such: //emulatorA redir add tcp:8000:8000 //emulatorB redir add tcp:8001:8001 However I can not get any communication beetwen those 2 emulators. As far as I understood the android tutorial about it should work like this redir add tcp:localhostPort:emulatorPort. I'm stuck with it :/. Can anyone point me the mistake or give some good advice. For the record while I was testing communication on a single device (client faking other node) everything worked, so I don't think there is a bug in the code. Btw does any one knows how can I get 2 set of logs for those 2 emulators (logA, logB)? It would help me a lot.

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  • How to create a zip file and keep entries for directories?

    - by NathanZ
    I would like to create a zip archive from a folder and keep entries for (non-empty) directories. In the code below, FileInputStream throws a FileNotFoundException when a directory is passed to AddToZip. I have tried to put a condition around the actual writing of bytes but it makes the whole archive invalid. How can I add directory entries to the archive? public static void addToZip(File directoryToZip, File file, ZipOutputStream zos) throws FileNotFoundException, IOException { String zipFilePath = file.getCanonicalPath().substring(directoryToZip.getCanonicalPath().length() + 1,file.getCanonicalPath().length()); System.out.println("Writing '" + zipFilePath + "' to zip file"); ZipEntry zipEntry = new ZipEntry(zipFilePath); zos.putNextEntry(zipEntry); FileInputStream fis = new FileInputStream(file); // Throws a FileNotFoundException when directory byte[] bytes = new byte[1024]; int length; while ((length = fis.read(bytes)) >= 0) { zos.write(bytes, 0, length); } zos.closeEntry(); fis.close(); }

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  • Serialize a C# class to binary be used by C++. How to handle alignment?

    - by glenn.danthi
    I am currently serializing a C# class into a binary stream using BinaryWriter. I take each element of the class and write it out using BinaryWriter. This worked fine as the C++ application reading this binary file supported packed structs and hence the binary file could be loaded directly. Now I have got a request to handle alignment as a new application has popped up which cannot support packed structs. What's the best way to convert the C# class and exporting it out as a binary keeping both 2 byte as well as 4 byte alignment in mind? The user can choose the alignment.

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  • c/c++ how to convert short to char

    - by changed
    Hi I am using ms c++. I am using struct like struct header { unsigned port : 16; unsigned destport : 16; unsigned not_used : 7; unsigned packet_length : 9; }; struct header HR; here this value of header i need to put in separate char array. i did memcpy(&REQUEST[0], &HR, sizeof(HR)); but value of packet_length is not appearing properly. like if i am assigning HR.packet_length = 31; i am getting -128(at fifth byte) and 15(at sixth byte). if you can help me with this or if their is more elegant way to do this. thanks

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  • How to read binary column in database into image on asp.net page?

    - by marko
    I want to read from database where I've stored a image in binary field and display a image. while (reader.Read()) { byte[] imgarr = (byte[])reader["file"]; Stream s = new MemoryStream(imgarr); System.Drawing.Image image = System.Drawing.Image.FromStream(s); Graphics g = Graphics.FromImage(image); g.DrawImage(image, new Point(400, 10)); image.Save(Response.OutputStream, ImageFormat.Jpeg); g.Dispose(); image.Dispose(); } con.Close(); This piece of code doesn't work: System.Drawing.Image image = System.Drawing.Image.FromStream(s); What am I doing wrong?

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  • How to read a XML format file to memory in C#?

    - by Nano HE
    // .net 2.0 and vs2005 used. I find some code below. I am not sure I can extended the sample code or not? thank you. if (radioButton.Checked) { MemoryStream ms=new MemoryStream(); byte[] data=ASCIIEncoding.ASCII.GetBytes(textBox1.Text); ms.Write(data,0,data.Length); reader = new XmlTextReader(ms); //some procesing code ms.Close(); reader.Close(); } BTW, Could you please help me to do some dissection about the line below. byte[] data=ASCIIEncoding.ASCII.GetBytes(textBox1.Text);

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  • x86 and Memory Addressing

    - by IM
    I've been reading up on memory models in an assembly book I picked up and I have a question or two. Let's say that the address bus has 32 lines, the data bus has 32 lines and the CPU is 32-bit (for simplicity). Now if the CPU makes a read request and sends the 32bit address, but only needs 8 bits, all 32 bits come back anyway? Also, the addresses in memory are still addressed per byte correct? So fetching one byte would bring back 0000 0001 to address 0000 0004? Thanks in advance

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  • Download Large Files using java

    - by angelina
    Dear All, I M building a application in which i want to download large files on handset (mobile),but if size of file is large i m getting exception socket exception-broken pipe . inputStream = new FileInputStream(path); byte[] buffer = new byte[1024]; int bytesRead = 0; do { bytesRead = inputStream.read(buffer, offset, buffer.length); resp.getOutputStream().write(buffer, 0, bytesRead); } while (bytesRead == buffer.length); resp.getOutputStream().flush(); }

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  • How do I read UTF-8 characters via a pointer?

    - by Jen
    Suppose I have UTF-8 content stored in memory, how do I read the characters using a pointer? I presume I need to watch for the 8th bit indicating a multi-byte character, but how exactly do I turn the sequence into a valid Unicode character? Also, is wchar_t the proper type to store a single Unicode character? This is what I have in mind: wchar_t readNextChar (char** p) { char ch = *p++; if (ch & 128) { // This is a multi-byte character, what do I do now? // char chNext = *p++; // ... but how do I assemble the Unicode character? ... } ... }

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  • Add progressbar to BZip2CompressorInputStream

    - by bordeux
    This is my code: public void extract(String input_f, String output_f){ int buffersize = 1024; FileInputStream in; try { in = new FileInputStream(input_f); FileOutputStream out = new FileOutputStream(output_f); BZip2CompressorInputStream bzIn = new BZip2CompressorInputStream(in); final byte[] buffer = new byte[buffersize]; int n = 0; while (-1 != (n = bzIn.read(buffer))) { out.write(buffer, 0, n); } out.close(); bzIn.close(); } catch (Exception e) { throw new Error(e.getMessage()); } } How can i add progress bar to extract task, or how can i get the compressed file size?

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  • sql server bulk copy out/postgres copy from infile

    - by Chris Curvey
    I'm starting a conversion of a system from MS SQL Server to Postgres. I have the table structures converted, and I use "bcp" to get the data out of SQL Server. ERROR: invalid byte sequence for encoding "UTF8": 0x80 HINT: This error can also happen if the byte sequence does not match the encoding expected by the server, which is controlled by "client_encoding". CONTEXT: COPY cm_outgoing, line 200: "200 c:\temp\200.xml 2009-10-10 01:50:44.000 1900-01-01 00:00:00.000" I've already used "sed" to get rid of the NUL (0x00) entries in the file, and I can't find any instances of 0x80 in the file that I'm trying to import. Any thoughts? Is there an easier way?

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  • Supplying output parameter to sqlparametercollection resulting in error (Varbinary)

    - by dotnetdev
    Hi, I want to supply an output parameter to my stored proc. This output proc is returning byte[]. How do I do this? If I do the following: command.Parameters.Add(new SqlParameter("@Bytes", SqlDbType.VarBinary)); command.Parameters[1].Direction = ParameterDirection.Output; I get: System.InvalidOperationException: Byte[][1]: the Size property has an invalid size of 0. This stored proc works fine in SQL Server when I execute it via the SSMS option "Execute Stored Procedure). Any ideas? Thanks

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  • Unboxing object containing a value which is known to be assignable to an integer variable

    - by Wim Coenen
    If I have an object instance and I know it is actually a boxed integer, then I can simply cast it back to int like this: object o = GetSomethingByName("foo"); int i = (int)o; However, I don't actually know that the value is an integer. I only know that it can be assigned to an integer. For example, it could be a byte, and the above code would throw InvalidCastException in that case. Instead I would have to do this: object o = GetSomethingByName("foo"); int i = (int)(byte)o; The value could also be a short, or something else which can be assigned to an int. How do I generalize my code to handle all those cases (without handling each possibility separately)?

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  • Do private classes need to be accessed by properties?

    - by Andy
    I am using an instance of a private class as the state object supplied to a stream.BeginRead operation. (The class is private to my main stream reading/writing class.) public class MainClass { // ... private class ResponseState { public IResponse response; public Stream stream; public byte[] buffer = new byte[1024]; } } Access to the class is via the fields directly. Should I really be providing access to the class via properties in this case, even though it is only to be used for holding state? Interested to know what others do.

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  • What is the most efficient way to read many bytes from SQL Server using SqlDataReader (C#)

    - by eccentric
    Hi everybody! What is the most efficient way to read bytes (8-16 K) from SQL Server using SqlDataReader. It seems I know 2 ways: byte[] buffer = new byte[4096]; MemoryStream stream = new MemoryStream(); long l, dataOffset = 0; while ((l = reader.GetBytes(columnIndex, dataOffset, buffer, 0, buffer.Length)) > 0) { stream.Write(buffer, 0, buffer.Length); dataOffset += l; } and reader.GetSqlBinary(columnIndex).Value The data type is IMAGE

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  • Invalid parameter used when trying to save a graphic image of mms.

    - by Sheery
    Hi, I have an application build in C# using PC Suite API, when i am trying to copy mms image to my PC it gives me an error of invalid parameters, can any one help me in this matter ...my code is dataVersit = (CAContentAccess.CADataDefinitions.CA_DATA_VERSIT)Marshal.PtrToStructure(bufData, typeof(CAContentAccess.CADataDefinitions.CA_DATA_VERSIT)); byte[] bVersitObject = new byte[dataVersit.iDataLength]; Marshal.Copy(dataVersit.pbVersitObject, bVersitObject, 0 , dataVersit.iDataLength); System.IO.Stream ios = System.IO.File.Open(fileDlg.FileName, System.IO.FileMode.Create); ios.Write(bVersitObject, bVersitObject.GetLowerBound(0), dataVersit.iDataLength); ios.Flush(); ios.Close();

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  • "Dereference" var in C#

    - by chris12892
    I have some code in C# that uses a structure as such: ArrayList addrs = new ArrayList(); byte[] addr = new byte[8]; while (oneWire.Search_GetNextDevice(addr)) { addrs.Add(addr); } In this example, every element in the ArrayList is the same as the last device that was found because it would appear as though addr is passed out by reference and I am simply copying that reference into the ArrayList. Is there any way to "Dereference" addr to only extract it's value? It's also possible my assessment of the situation is incorrect, if that appears to be the case, please let me know Thanks!

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  • How to create an ARGB_8888 pixel value?

    - by vidstige
    Say I want to create an array of pixel values to pass into the createBitmap method described here. I have three int values r, g, b in the range 0 - 0xff. How do I transform those into a opaque pixel p? Does the alpha channel go in the high byte or the low byte? I googled up the documentation but it only states that: Each pixel is stored on 4 bytes. Each channel (RGB and alpha for translucency) is stored with 8 bits of precision (256 possible values.) This configuration is very flexible and offers the best quality. It should be used whenever possible. So, how to write this method? int createPixel(int r, int g, int b) { retrurn ? }

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  • Record Name field in DNS responce

    - by Lescott
    I just read about DNS protocol, and found, that the name field can be writen in two ways: lenght of the next label the label lenght of the next label the label ... zero-byte pointer to the previous name field Next is the original article fragment: The Resource Record Name field is encoded in the same way as the Question Name field unless the name is already present elsewhere in the DNS message, in which case a 2-byte field is used in place of a length-value encoded name and acts as a pointer to the name that is already present. So, my question is, how can I determine the first or the second way is using in a package?

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  • Image URL has the contentType "text/html"

    - by user1503025
    I want to implement a method to download Image from website to laptop. public static void DownloadRemoteImageFile(string uri, string fileName) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); if ((response.StatusCode == HttpStatusCode.OK || response.StatusCode == HttpStatusCode.Moved || response.StatusCode == HttpStatusCode.Redirect) && response.ContentType.StartsWith("image", StringComparison.OrdinalIgnoreCase)) { //if the remote file was found, download it using (Stream inputStream = response.GetResponseStream()) using (Stream outputStream = File.OpenWrite(fileName)) { byte[] buffer = new byte[4096]; int bytesRead; do { bytesRead = inputStream.Read(buffer, 0, buffer.Length); outputStream.Write(buffer, 0, bytesRead); } while (bytesRead != 0); } } } But the ContentType of request or response is not "image/jpg" or "image/png". They're always "text/html". I think that's why after I save them to local, they has incorrect content and I cannot view them. Can anyone has a solution here? Thanks

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