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  • Why is WCF Stream response getting corrupted on write to disk?

    - by Alvin S
    I am wanting to write a WCF web service that can send files over the wire to the client. So I have one setup that sends a Stream response. Here is my code on the client: private void button1_Click(object sender, EventArgs e) { string filename = System.Environment.CurrentDirectory + "\\Picture.jpg"; if (File.Exists(filename)) File.Delete(filename); StreamServiceClient client = new StreamServiceClient(); int length = 256; byte[] buffer = new byte[length]; FileStream sink = new FileStream(filename, FileMode.CreateNew, FileAccess.Write); Stream source = client.GetData(); int bytesRead; while ((bytesRead = source.Read(buffer,0,length))> 0) { sink.Write(buffer,0,length); } source.Close(); sink.Close(); MessageBox.Show("All done"); } Everything processes fine with no errors or exceptions. The problem is that the .jpg file that is getting transferred is reported as being "corrupted or too large" when I open it. What am I doing wrong? On the server side, here is the method that is sending the file. public Stream GetData() { string filename = Environment.CurrentDirectory+"\\Chrysanthemum.jpg"; FileStream myfile = File.OpenRead(filename); return myfile; } I have the server configured with basicHttp binding with Transfermode.StreamedResponse.

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  • ASP.NET file transfer from local machine to another machine

    - by Imcl
    I basically want to transfer a file from the client to the file storage server without actual login to the server so that the client cannot access the storage location on the server directly. I can do this only if i manually login to the storage server through windows login. I dont want to do that. This is a Web-Based Application. Using the link below, I wrote a code for my application. I am not able to get it right though, Please refer the link and help me ot with it... http://stackoverflow.com/questions/263518/c-uploading-files-to-file-server The following is my code:- protected void Button1_Click(object sender, EventArgs e) { filePath = FileUpload1.FileName; try { WebClient client = new WebClient(); NetworkCredential nc = new NetworkCredential(uName, password); Uri addy = new Uri("\\\\192.168.1.3\\upload\\"); client.Credentials = nc; byte[] arrReturn = client.UploadFile(addy, filePath); Console.WriteLine(arrReturn.ToString()); } catch (Exception ex) { Console.WriteLine(ex.Message); } } The following line doesn't execute... byte[] arrReturn = client.UploadFile(addy, filePath); This is the error I get: An exception occurred during a WebClient request

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  • File Upload with HttpWebRequest doesn't post the file

    - by Sri Kumar
    Hello All, Here is my code to post the file. I use asp fileupload control to get the file stream. HttpWebRequest requestToSender = (HttpWebRequest)WebRequest.Create("http://localhost:2518/Web/CrossPage.aspx"); requestToSender.Method = "POST"; requestToSender.ContentType = "multipart/form-data"; requestToSender.KeepAlive = true; requestToSender.Credentials = System.Net.CredentialCache.DefaultCredentials; requestToSender.ContentLength = BtnUpload.PostedFile.ContentLength; BinaryReader binaryReader = new BinaryReader(BtnUpload.PostedFile.InputStream); byte[] binData = binaryReader.ReadBytes(BtnUpload.PostedFile.ContentLength); Stream requestStream = requestToSender.GetRequestStream(); requestStream.Write(binData, 0, binData.Length); requestStream.Close(); HttpWebResponse responseFromSender = (HttpWebResponse)requestToSender.GetResponse(); string fromSender = string.Empty; using (StreamReader responseReader = new StreamReader(responseFromSender.GetResponseStream())) { fromSender = responseReader.ReadToEnd(); } XMLString.Text = fromSender; In the page load of CrossPage.aspx i have the following code NameValueCollection postPageCollection = Request.Form; foreach (string name in postPageCollection.AllKeys) { Response.Write(name + " " + postPageCollection[name]); } HttpFileCollection postCollection = Request.Files; foreach (string name in postCollection.AllKeys) { HttpPostedFile aFile = postCollection[name]; aFile.SaveAs(Server.MapPath(".") + "/" + Path.GetFileName(aFile.FileName)); } string strxml = "sample"; Response.Clear(); Response.Write(strxml); I don't get the file in Request.Files. The byte array is created. What was wrong with my HttpWebRequest?

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  • Why does text from Assembly.GetManifestResourceStream() start with three junk characters?

    - by flipdoubt
    I have a SQL file added to my VS.NET 2008 project as an embedded resource. Whenever I use the following code to read the file's content, the string returned always starts with three junk characters and then the text I expect. I assume this has something to do with the Encoding.Default I am using, but that is just a guess. Why does this text keep showing up? Should I just trim off the first three characters or is there a more informed approach? public string GetUpdateRestoreSchemaScript() { var type = GetType(); var a = Assembly.GetAssembly(type); var script = "UpdateRestoreSchema.sql"; var resourceName = String.Concat(type.Namespace, ".", script); using(Stream stream = a.GetManifestResourceStream(resourceName)) { byte[] buffer = new byte[stream.Length]; stream.Read(buffer, 0, buffer.Length); // UPDATE: Should be Encoding.UTF8 return Encoding.Default.GetString(buffer); } } Update: I now know that my code works as expected if I simply change the last line to return a UTF-8 encoded string. It will always be true for this embedded file, but will it always be true? Is there a way to test any buffer to determine its encoding?

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  • Trouble converting an MP3 file to a WAV file using Naudio

    - by WebDevHobo
    Naudio Library: http://naudio.codeplex.com/ I'm trying to convert an MP3 file to a WAV file, but I've run in to a small error. I know what's going wrong, but I don't really know how to go about fixing it. Here's the piece of code I'm running: private void button1_Click(object sender, EventArgs e) { using(Mp3FileReader reader = new Mp3FileReader(@"path\to\MP3")) { using(WaveFileWriter writer = new WaveFileWriter(@"C:\test.wav", new WaveFormat())) { int counter = 0; while(reader.Read(test, counter, test.Length + counter) != 0) { writer.WriteData(test, counter, test.Length + counter); counter += 512; } } } } reader.Read() goes into the Mp3FileReader class, and the method looks like this: public override int Read(byte[] sampleBuffer, int offset, int numBytes) { if (numBytes % waveFormat.BlockAlign != 0) //throw new ApplicationException("Must read complete blocks"); numBytes -= (numBytes % waveFormat.BlockAlign); return mp3Stream.Read(sampleBuffer, offset, numBytes); } mp3Stream is an object of the Stream class. The problem is: I'm getting an ArgumentException. MSDN says that this is because the sum of offset and numBytes is greater than the length of sampleBuffer. Documentation: http://msdn.microsoft.com/en-us/library/system.io.stream.read.aspx This happens because I increase the counter every time, but the size of the byte array test remains the same. What I've been wondering is: do I need to increase the size of the array dynamically, or do I need to find out the needed size at the beginning and set it right away? And also, instead of 512, the method in Mp3FileReader returns 365 the first time. Which is the size of a whole block. But I'm writing the full 512. I'm basically just using the read to check if I'm not at the end of the file yet. Do I need to catch the return value and do something with that, or am I good here?

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  • Create Zip File In Windows and Extract Zip File In Linux

    - by Yan Cheng CHEOK
    I had created a zip file (together with directory) under Windows as follow : package sandbox; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; /** * * @author yan-cheng.cheok */ public class Main { /** * @param args the command line arguments */ public static void main(String[] args) { // These are the files to include in the ZIP file String[] filenames = new String[]{"MyDirectory" + File.separator + "MyFile.txt"}; // Create a buffer for reading the files byte[] buf = new byte[1024]; try { // Create the ZIP file String outFilename = "outfile.zip"; ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outFilename)); // Compress the files for (int i=0; i<filenames.length; i++) { FileInputStream in = new FileInputStream(filenames[i]); // Add ZIP entry to output stream. out.putNextEntry(new ZipEntry(filenames[i])); // Transfer bytes from the file to the ZIP file int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } // Complete the entry out.closeEntry(); in.close(); } // Complete the ZIP file out.close(); } catch (IOException e) { e.printStackTrace(); } } } The newly created zip file can be extracted without problem under Windows, by using http://www.exampledepot.com/egs/java.util.zip/GetZip.html However, I realize if I extract the newly created zip file under Linux, using http://www.exampledepot.com/egs/java.util.zip/GetZip.html, I will get a file named "MyDirectory\MyFile.txt" instead of MyFile.txt being placed under folder MyDirectory. I try to solve the problem by changing the zip file creation code to String[] filenames = new String[]{"MyDirectory" + "/" + "MyFile.txt"}; But, is this an eligible solution, by hard-coded the seperator? Will it work under Mac OS? (I do not have a Mac to try out)

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  • Google's 'go' and scope/functions

    - by danwoods
    In one of the example servers given at golang.org: package main import ( "flag" "http" "io" "log" "template" ) var addr = flag.String("addr", ":1718", "http service address") // Q=17, R=18 var fmap = template.FormatterMap{ "html": template.HTMLFormatter, "url+html": UrlHtmlFormatter, } var templ = template.MustParse(templateStr, fmap) func main() { flag.Parse() http.Handle("/", http.HandlerFunc(QR)) err := http.ListenAndServe(*addr, nil) if err != nil { log.Exit("ListenAndServe:", err) } } func QR(c *http.Conn, req *http.Request) { templ.Execute(req.FormValue("s"), c) } func UrlHtmlFormatter(w io.Writer, v interface{}, fmt string) { template.HTMLEscape(w, []byte(http.URLEscape(v.(string)))) } const templateStr = ` <html> <head> <title>QR Link Generator</title> </head> <body> {.section @} <img src="http://chart.apis.google.com/chart?chs=300x300&cht=qr&choe=UTF- 8&chl={@|url+html}" /> <br> {@|html} <br> <br> {.end} <form action="/" name=f method="GET"><input maxLength=1024 size=70 name=s value="" title="Text to QR Encode"><input type=submit value="Show QR" name=qr> </form> </body> </html> ` Why is template.HTMLEscape(w, []byte(http.URLEscape(v.(string)))) contained within UrlHtmlFormatter? Why can't it be directly linked to "url+html"?

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  • Will HttpResponse.Filter buffer the whole data before start the sending?

    - by vtortola
    Hi, An user posts this article about how to use HttpResponse.Filter to compress large amounts of data. But what will happen if I try to transfer a 4G file? will it load the whole file in memory in order to compress it? or otherwise it will compress it chunk by chunk? I mean, I'm doing this right now: public void GetFile(HttpResponse response) { String fileName = "example.iso"; response.ClearHeaders(); response.ClearContent(); response.ContentType = "application/octet-stream"; response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName); response.AppendHeader("Content-Length", new FileInfo(fileName).Length.ToString()); using (FileStream fs = new FileStream(Path.Combine(HttpContext.Current.Server.MapPath("~/App_Data"), fileName), FileMode.Open)) using (DeflateStream ds = new DeflateStream(fs,CompressionMode.Compress)) { Byte[] buffer = new Byte[4096]; Int32 readed = 0; while ((readed = ds.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, readed); response.Flush(); } } } So at the same time I'm reading, I'm compressing and sending it. Then I wanna know if HttpResponse do the same thing, or otherwise it will load the whole file in memory in order to compress it. Cheers.

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  • SQLite table does not exist exception for existing SQLite database (and table)

    - by SK9
    I've followed the instructions given here for introducing an existing SQLite database to your Android app. When I query the table "android_metadata" this is fine. But when I run a similar query on my own table "words" (which has _id for primary integer key) I get a table does not exist exception and the app crashes. Why is that? Code: Cursor c = myDatabase.query("android_metadata", null, null, null, null, null, null, null); works but Cursor c = myDatabase.query("words", null, null, null, null, null, null, null); returns a table does not exist exception. This is how I'm creating the database (the references to paths and filenames are correct): private void copyDatabase() throws IOException{ //Open local db as the input stream InputStream myInput = mContext.getAssets().open(DB_NAME); //Path to the just created empty db String outFileName = DB_PATH + DB_NAME; //Open the empty db as the output stream OutputStream myOutput = new FileOutputStream(outFileName); //Transfer bytes from the inputfile to the outputfile byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer))>0){ myOutput.write(buffer, 0, length); } //Close the streams myOutput.flush(); myOutput.close(); myInput.close(); } (Note: To my eyes, the table is there. I'm looking right at it in my SQLite browser.)

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  • Is there a way to receive receive data as unsugned char over UDP on QT

    - by user269037
    I need to send floating point numbers using UDP connection to a QT application. Now in QT the only function available is qint64 readDatagram ( char * data, qint64 maxSize, QHostAddress * address = 0, quint16 * port = 0 ) which accepts data in the form of signed character buffer. I can convert my float into a string and send it but it will obviously not be very efficient converting a 4 byte float into a much longer sized character buffer. I got hold of these 2 functions to convert a 4 byte float into an unsinged 32 bit integer to transfer over network which works fine for a simple c++ udp program but for QT I need to receive the data as unsigned char. Is it possible to avoid converting the floatinf point data into a string and then sending it ?? uint32_t htonf(float f) { uint32_t p; uint32_t sign; if (f < 0) { sign = 1; f = -f; } else { sign = 0; } p = ((((uint32_t)f)&0x7fff)<<16) | (sign<<31); // whole part and sign p |= (uint32_t)(((f - (int)f) * 65536.0f))&0xffff; // fraction return p; } float ntohf(uint32_t p) { float f = ((p16)&0x7fff); // whole part f += (p&0xffff) / 65536.0f; // fraction if (((p>>31)&0x1) == 0x1) { f = -f; } // sign bit set return f; }

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  • android DES decrypt file : pad block corrupted

    - by Kenny Chang
    public class TestDES { Key key; public TestDES(String str) { getKey(str); } public void getKey(String strKey) { try { KeyGenerator _generator = KeyGenerator.getInstance("DES"); _generator.init(new SecureRandom(strKey.getBytes())); this.key = _generator.generateKey(); _generator = null; } catch (Exception e) { throw new RuntimeException("Error initializing SqlMap class. Cause: " + e); } } public void decrypt(String file, String dest) throws Exception { Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, this.key); InputStream is = new FileInputStream(file); OutputStream out = new FileOutputStream(dest); CipherOutputStream cos = new CipherOutputStream(out, cipher); byte[] buffer = new byte[1024 * 1024 * 6]; int r; while ((r = is.read(buffer)) >= 0) { cos.write(buffer, 0, r); } cos.close();a out.close(); is.close(); } } The code works well on PC JAVA Program, but not on android.The error "pad block corrupted" happended at 'cos.close();' LogCat shows:" 03-10 07:43:04.431: WARN/System.err(23765): java.io.IOException: pad block corrupted 03-10 07:43:04.460: WARN/System.err(23765): at javax.crypto.CipherOutputStream.close(CipherOutputStream.java:157) "

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  • Read binary file into a struct C#

    - by Robert Höglund
    I'm trying to read binary data using C#. I have all 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 slighlty 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 but to no avail:StructType aStruct; int count = Marshal.SizeOf(typeof(StructType)); byte[] readBuffer = new byte[count]; BinaryReader reader = new BinaryReader(stream); readBuffer = reader.ReadBytes(count); GCHandle handle = GCHandle.Alloc(readBuffer, GCHandleType.Pinned); aStruct = (StructType) Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(StructType)); handle.Free(); The stream is an opened FileStream from which I have began to read from. I get an AccessViolationException when using Marshal.PtrToStructure. The stream contains more information than I'm trying to read since I'm not interested in data at the end of the file. The struct is defined like:[StructLayout(LayoutKind.Explicit)] struct StructType { [FieldOffset(0)] public string FileDate; [FieldOffset(8)] public string FileTime; [FieldOffset(16)] public int Id1; [FieldOffset(20)] public string Id2; } The examples code is changed from original to make this question shorter. How would I read binary data from a file into a struct?

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  • Android: writing a file to sdcard

    - by Sumit M Asok
    I'm trying to write a file from an Http post reply to a file on the sdcard. Everything works fine until the byte array of data is retrieved. I've tried setting WRITE_EXTERNAL_STORAGE permission in the manifest and tried many different combinations of tutorials I found on the net. All I could find was using the openFileOutput("",MODE_WORLD_READABLE) method, of the activity but how my app writes file is by using a thread. Specifically, a thread is invoked from another thread when a file has to be written, so giving an activity object didn't work even though I tried it. The app has come a long way and I cannot change how the app is currently written. Please, someone help me? CODE: File file = new File(bgdmanip.savLocation); FileOutputStream filecon = null; filecon = new FileOutputStream(file); // bgdmanip.savLocation holds the whole files path byte[] myByte; myByte = Base64Coder.decode(seReply); Log.d("myBytes", String.valueOf(myByte)); bos.write(myByte); filecon.write(myByte); myvals = x * 11024; seReply is a string reply from HttpPost response. the second set of code is looped with reference to x. the file is created but remains 0 bytes

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  • SerializationException Occurring Only in Release Mode

    - by Calvin Nguyen
    Hi, I am working on an ASP.NET web app using Visual Studio 2008 and a third-party library. Things are fine in my development environment. Things are also good if the web app is deployed in Debug configuration. However, when it is deployed in Release mode, SerializationExceptions appear intermittently, breaking other functionality. In the Windows event log, the following error can be seen: "An unhandled exception occurred and the process was terminated. Application ID: DefaultDomain Process ID: 3972 Exception: System.Runtime.Serialization.SerializationException Message: Unable to find assembly 'MyThirdPartyLibrary, Version=1.234.5.67, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89'. StackTrace: at System.Runtime.Serialization.Formatters.Binary.BinaryAssemblyInfo.GetAssembly( ) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.GetType(BinaryAsse mblyInfo assemblyInfo, String name) at System.Runtime.Serialization.Formatters.Binary.ObjectMap..ctor(String objectName, String[] memberNames, BinaryTypeEnum[] binaryTypeEnumA, Object[] typeInformationA, Int32[] memberAssemIds, ObjectReader objectReader, Int32 objectId, BinaryAssemblyInfo assemblyInfo, SizedArray assemIdToAssemblyTable) at System.Runtime.Serialization.Formatters.Binary.ObjectMap.Create(String name, String[] memberNames, BinaryTypeEnum[] binaryTypeEnumA, Object[] typeInformationA, Int32[] memberAssemIds, ObjectReader objectReader, Int32 objectId, BinaryAssemblyInfo assemblyInfo, SizedArray assemIdToAssemblyTable) at System.Runtime.Serialization.Formatters.Binary._BinaryParser.ReadObjectWithMa pTyped(BinaryObjectWithMapTyped record) at System.Runtime.Serialization.Formatters.Binary._BinaryParser.ReadObjectWithMa pTyped(BinaryHeaderEnum binaryHeaderEnum) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run() at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(Header Handler handler, __BinaryParser serParser, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Str eam serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Remoting.Channels.CrossAppDomainSerializer.DeserializeObject(Me moryStream stm) at System.AppDomain.Deserialize(Byte[] blob) at System.AppDomain.UnmarshalObject(Byte[] blob) For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp." Using FUSLOGVW.exe (i.e., Assembly Binding Log Viewer), I can see the problem is that IIS attempts to find MyThirdPartyLibrary in directory C:\windows\system32\inetsrv. It refuses to look in the bin folder of the web app, where the DLL is actually located. Does anyone know what the problem is? Thanks, Calvin

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  • Texture loading at joGL

    - by Nour
    hi I've been trying to load a bmp picture to use it as a texture at my program I've used a IOstream Class to extend DataInputStream to read the pixels at the photo with this code "based on a texture loader code for c++ " : //class Data members public static int BMPtextures[]; public static int BMPtexCount = 30; public static int currentTextureID = 0; //loading methode static int loadBMPTexture(int index, String fileName, GL gl) { try { IOStream wdis = new IOStream(fileName); wdis.skipBytes(18); int width = wdis.readIntW(); int height = wdis.readIntW(); wdis.skipBytes(28); byte buf[] = new byte[wdis.available()]; wdis.read(buf); wdis.close(); gl.glBindTexture(GL.GL_TEXTURE_2D, BMPtextures[index]); gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, 3, width, height, 0, GL.GL_BGR, GL.GL_UNSIGNED_BYTE, buf); gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR); gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR); currentTextureID = index; return currentTextureID; } catch (IOException ex) { // Utils.msgBox("File Error\n" + fileName, "Error", Utils.MSG_WARN); return -1; } } and IOStream code : public class IOStream extends DataInputStream { public IOStream(String file) throws FileNotFoundException { super(new FileInputStream(file)); } public short readShortW() throws IOException { return (short)(readUnsignedByte() + readUnsignedByte() * 256); } public int readIntW() throws IOException { return readShortW() + readShortW() * 256 * 256; } void read(Buffer[] buf) { } } and the calling: GTexture.loadBMPTexture(1,"/BasicJOGL/src/basicjogl/data/Font.bmp",gl); after debugging I figured out that when it come to this line : IOStream wdis = new IOStream(fileName); an IOExeption occurred and it's a dispatchException .. what this impose to mean ?? and how can I solve it ? by the way i tried to : 1- use \ and \ and / and // 2- change the path of the photo and take all the path from c:\ to the photoname.bmp 3- rename the photo using numbers like 1.bmp but nothing seems to work :(

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  • C# serialPort speed

    - by MarekK
    Hi I am developing some monitoring tool for some kind of protocol based on serial communication. Serial BaudRate=187,5kb I use System.IO.Ports.SerialPort class. This protocol has 4 kinds of frames. They have 1Byte,3Bytes,6Bytes, 10-255Bytes. I can work with them but I receive them too late to respond. For the beginning I receive first packed after ex. 96ms (too late), and it contains about 1000B. This means 20-50 frames (too much, too late). Later its work more stable, 3-10Bytes but it is still too late because it contains 1-2 frames. Of Course 1 frame is OK, but 2 is too late. Can you point me how can I deal with it more reliable? I know it is possible. Revision1: I tried straight way: private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) { if (!serialPort1.IsOpen) return; this.BeginInvoke(new EventHandler(this.DataReceived)); } And Backgroud worker: And ... new Tread(Read) and... always the same. Too late, too slow. Do I have to go back to WinApi and import some kernel32.dll functions? Revision 2: this is the part of code use in the Treading way: int c = serialPort1.BytesToRead; byte[] b = new byte[c]; serialPort1.Read(b, 0, c); I guess it is some problem with stream use inside SerialPort class. Or some synchronization problem. Revision 3: I do not use both at once!! I just tried different ways. Regards MarekK

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  • What is private bytes, virtual bytes, working set?

    - by Devil Jin
    I am using perfmon windows utility to debug memory leak in a process. Perfmon explaination: Working Set- Working Set is the current size, in bytes, of the Working Set of this process. The Working Set is the set of memory pages touched recently by the threads in the process. If free memory in the computer is above a threshold, pages are left in the Working Set of a process even if they are not in use. When free memory falls below a threshold, pages are trimmed from Working Sets. If they are needed they will then be soft-faulted back into the Working Set before leaving main memory. Virtual Bytes- Virtual Bytes is the current size, in bytes, of the virtual address space the process is using. Use of virtual address space does not necessarily imply corresponding use of either disk or main memory pages. Virtual space is finite, and the process can limit its ability to load libraries. Private Bytes- Private Bytes is the current size, in bytes, of memory that this process has allocated that cannot be shared with other processes. Q1. Is it the private byte should I measure to be sure if the process is having any leak as it does not involve any shared libraries and any leak if happening will be coming from the process itself? Q2. What is the total memory consumed by the process? Is it the Virtual byte size? or Is it the sum of Virtual Bytes and Working Set Q3. Is there any relation between private bytes, working set and virtual bytes. Q4. Any tool which gives a better idea memory information?

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  • Compression algorithm for IEEE-754 data

    - by David Taylor
    Anyone have a recommendation on a good compression algorithm that works well with double precision floating point values? We have found that the binary representation of floating point values results in very poor compression rates with common compression programs (e.g. Zip, RAR, 7-Zip etc). The data we need to compress is a one dimensional array of 8-byte values sorted in monotonically increasing order. The values represent temperatures in Kelvin with a span typically under of 100 degrees. The number of values ranges from a few hundred to at most 64K. Clarifications All values in the array are distinct, though repetition does exist at the byte level due to the way floating point values are represented. A lossless algorithm is desired since this is scientific data. Conversion to a fixed point representation with sufficient precision (~5 decimals) might be acceptable provided there is a significant improvement in storage efficiency. Update Found an interesting article on this subject. Not sure how applicable the approach is to my requirements. http://users.ices.utexas.edu/~burtscher/papers/dcc06.pdf

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  • File Format DOS/Unix/MAC code sample

    - by mac
    I have written the following method to detemine whether file in question is formatted with DOS/ MAC, or UNIX line endings. I see at least 1 obvious issue: 1. i am hoping that i will get the EOL on the first run, say within first 1000 bytes. This may or may not happen. I ask you to review this and suggest improvements which will lead to hardening the code and making it more generic. THANK YOU. new FileFormat().discover(fileName, 0, 1000); and then public void discover(String fileName, int offset, int depth) throws IOException { BufferedInputStream in = new BufferedInputStream(new FileInputStream(fileName)); FileReader a = new FileReader(new File(fileName)); byte[] bytes = new byte[(int) depth]; in.read(bytes, offset, depth); a.close(); in.close(); int thisByte; int nextByte; boolean isDos = false; boolean isUnix = false; boolean isMac = false; for (int i = 0; i < (bytes.length - 1); i++) { thisByte = bytes[i]; nextByte = bytes[i + 1]; if (thisByte == 10 && nextByte != 13) { isDos = true; break; } else if (thisByte == 13) { isUnix = true; break; } else if (thisByte == 10) { isMac = true; break; } } if (!(isDos || isMac || isUnix)) { discover(fileName, offset + depth, depth + 1000); } else { // do something clever } }

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  • An alternative to reading input from Java's System.in

    - by dvanaria
    I’m working on the UVa Online Judge problem set archive as a way to practice Java, and as a way to practice data structures and algorithms in general. They give an example input file to submit to the online judge to use as a starting point (it’s the solution to problem 100). Input from the standard input stream (java.lang.System.in) is required as part of any solution on this site, but I can’t understand the implementation of reading from System.in they give in their example solution. It’s true that the input file could consist of any variation of integers, strings, etc, but every solution program requires reading basic lines of text input from System.in, one line at a time. There has to be a better (simpler and more robust) method of gathering data from the standard input stream in Java than this: public static String readLn(int maxLg) { byte lin[] = new byte[maxLg]; int lg = 0, car = -1; String line = “”; try { while (lg < maxLg) { car = System.in.read(); if ((car < 0) || (car == ‘\n’)) { break; } lin[lg++] += car; } } catch (java.io.IOException e) { return (null); } if ((car < 0) && (lg == 0)) { return (null); // eof } return (new String(lin, 0, lg)); } I’m really surprised by this. It looks like something pulled directly from K&R’s “C Programming Language” (a great book regardless), minus the access level modifer and exception handling, etc. Even though I understand the implementation, it just seems like it was written by a C programmer and bypasses most of Java’s object oriented nature. Isn’t there a better way to do this, using the StringTokenizer class or maybe using the split method of String or the java.util.regex package instead?

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  • Not able to use 7-Zip to compress stdin and output with stdout?

    - by acidzombie24
    I get the error "Not implemented". I want to compress a file using 7-Zip via stdin then take the data via stdout and do more conversions with my application. In the man page it shows this example: % echo foo | 7z a dummy -tgzip -si -so /dev/null I am using Windows and C#. Results: 7-Zip 4.65 Copyright (c) 1999-2009 Igor Pavlov 2009-02-03 Creating archive StdOut System error: Not implemented Code: public static byte[] a7zipBuf(byte[] b) { string line; var p = new Process(); line = string.Format("a dummy -t7z -si -so "); p.StartInfo.Arguments = line; p.StartInfo.FileName = @"C:\Program Files\7-Zip\7z.exe"; p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden; p.StartInfo.CreateNoWindow = true; p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.RedirectStandardError = true; p.StartInfo.RedirectStandardInput = true; p.Start(); p.StandardInput.BaseStream.Write(b, 0, b.Length); p.StandardInput.Close(); Console.Write(p.StandardError.ReadToEnd()); //Console.Write(p.StandardOutput.ReadToEnd()); return p.StandardOutput.BaseStream.ReadFully(); } Is there another simple way to read the file into memory? Right now I can 1) write to a temporary file and read (easy and can copy/paste some code) 2) use a file pipe (medium? I have never done it) 3) Something else.

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  • Getting a binary file from resource in C#

    - by Jesse Knott
    Hello, I am having a bit of a problem, I am trying to get a PDF as a resource in my application. At this point I have a fillable PDF that I have been able to store as a file next to the binary, but now I am trying to embed the PDF as a resource in the binary. byte[] buffer; try { s = typeof(BattleTracker).Assembly.GetManifestResourceStream("libReports.Resources.DAForm1594.pdf"); buffer = new byte[s.Length]; int read = 0; do { read = s.Read(buffer, read, 32768); } while (read > 0); } catch (Exception e) { throw new Exception("Error: could not import report:", e); } // read existing PDF document PdfReader r = new PdfReader( // optimize memory usage buffer, null ); Every time I run the code I get an error saying "Rebuild trailer not found. Original Error: PDF startxref not found" When I was just opening the file via a path to the static file in my directory it worked fine. I have tried using different encodings UTF-8, UTF-32, UTF-7, ASCII, etc etc.... As a side note I had the same problem with getting a Powerpoint file as a resource, I was finally able to fix that problem by converting the Powerpoint to xml and using that. I have considered doing the same for the PDF but I am referencing elements by field name which does not seem to work with XML PDFs. Can anyone help me out with this? Thanks in advance!

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  • Resize transparent images using C#

    - by MartinHN
    Does anyone have the secret formula to resizing transparent images (mainly GIFs) without ANY quality loss - what so ever? I've tried a bunch of stuff, the closest I get is not good enough. Take a look at my main image: http://www.thewallcompany.dk/test/main.gif And then the scaled image: http://www.thewallcompany.dk/test/ScaledImage.gif //Internal resize for indexed colored images void IndexedRezise(int xSize, int ySize) { BitmapData sourceData; BitmapData targetData; AdjustSizes(ref xSize, ref ySize); scaledBitmap = new Bitmap(xSize, ySize, bitmap.PixelFormat); scaledBitmap.Palette = bitmap.Palette; sourceData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, bitmap.PixelFormat); try { targetData = scaledBitmap.LockBits(new Rectangle(0, 0, xSize, ySize), ImageLockMode.WriteOnly, scaledBitmap.PixelFormat); try { xFactor = (Double)bitmap.Width / (Double)scaledBitmap.Width; yFactor = (Double)bitmap.Height / (Double)scaledBitmap.Height; sourceStride = sourceData.Stride; sourceScan0 = sourceData.Scan0; int targetStride = targetData.Stride; System.IntPtr targetScan0 = targetData.Scan0; unsafe { byte* p = (byte*)(void*)targetScan0; int nOffset = targetStride - scaledBitmap.Width; int nWidth = scaledBitmap.Width; for (int y = 0; y < scaledBitmap.Height; ++y) { for (int x = 0; x < nWidth; ++x) { p[0] = GetSourceByteAt(x, y); ++p; } p += nOffset; } } } finally { scaledBitmap.UnlockBits(targetData); } } finally { bitmap.UnlockBits(sourceData); } } I'm using the above code, to do the indexed resizing. Does anyone have improvement ideas?

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  • mono --aot with MinGW: unknown pseudo-op: `.local'

    - by Jared Updike
    Can I user mono's AOT feature to natively "pre-compile" .NET DLLs (and or EXEs) to make them harder to reverse engineer? If so, how do I get mono/AOT working in Windows 7? (I'm running x64 but the app is targeting x86 explicitly.) I just installed Mono 2.6.3 and MinGW 5.1.6 and I'm trying to AOT compile an exe (or a dll, it doesn't matter). I get screens and screens of error messages: C:\Users\jupdike\AppData\Local\Temp\mono_aot_XSDEAV:533: Error: junk at end of line, first unrecognized character is `H' C:\Users\jupdike\AppData\Local\Temp\mono_aot_XSDEAV:539: Error: unknown pseudo-op: `.local' C:\Users\jupdike\AppData\Local\Temp\mono_aot_XSDEAV:546: Warning: .size pseudo-op used outside of .def/.endef ignored. C:\Users\jupdike\AppData\Local\Temp\mono_aot_XSDEAV:546: Error: junk at end of line, first unrecognized character is `H' I can open the generated assembly code but I have no idea why the assembler chokes on it: .size HappyForms_TextForm__ctor_string_string_string_bool,.-HappyForms_TextForm__ctor_string_string_string_bool (533) _.Lme_a: .Lme_a: .balign 16 _.Lm_b: .Lm_b: .local HappyForms_TextForm_get_InputValue (539) _HappyForms_TextForm_get_InputValue: HappyForms_TextForm_get_InputValue: .byte 85,139,236,131,236,8,139,69,8,139,128,216,2,0,0,131,236,12,80,139,0,144,144,144,255,144,200,2,0,0,131,196 .byte 16,201,195 .size HappyForms_TextForm_get_InputValue,.-HappyForms_TextForm_get_InputValue (546) (numbers above in parens are line numbers)

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  • Android : Bitmap save to location

    - by Chrispix
    I am working on a function to download an image from a web server, redisplay it on the screen, and if the user wishes to keep the image, save it on the SD card in a certain folder. Is there an easy way to take a bitmap and just save it to the SD card in a folder of my choice? My issue is that I can download the image, display it on screen as a Bitmap. The only way I have been able to find to save an image to a particular folder is to use FileOutputStream, but that requires a byte array. I am not sure how to convert (if this is even the right way) from Bitmap to byte array, so I can use a Fileoutput stream to write the data. The other option I have is it use MediaStore : MediaStore.Images.Media.insertImage(getContentResolver(), bm, barcodeNumber + ".jpg Card Image", barcodeNumber + ".jpg Card Image"); Which works fine to save to SD card, but does not allow you to customize the folder. Any assistance would be very much appreciated. Thank you in advance.

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