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• form not showing

  - by Luke

  Perhaps this has something to do with it being the mainForm, but I'll ask the question. I have my mainForm that is the first to load when the program is booted. I then click a button called Add, which should open a new form, and close the mainForm. The problem is, is shows the new form for a split second, then closes both. The code: private void addFrmBtn_Click(object sender, EventArgs e) { saveForm saveform = new saveForm(); saveform.Show(); this.Close(); }

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• Is it possible to gzip and upload this string to Amazon S3 without ever being written to disk?

  - by BigJoe714

  I know this is probably possible using Streams, but I wasn't sure the correct syntax. I would like to pass a string to the Save method and have it gzip the string and upload it to Amazon S3 without ever being written to disk. The current method inefficiently reads/writes to disk in between. The S3 PutObjectRequest has a constructor with InputStream input as an option. import java.io.*; import java.util.zip.GZIPOutputStream; import com.amazonaws.auth.PropertiesCredentials; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3Client; import com.amazonaws.services.s3.model.PutObjectRequest; public class FileStore { public static void Save(String data) throws IOException { File file = File.createTempFile("filemaster-", ".htm"); file.deleteOnExit(); Writer writer = new OutputStreamWriter(new FileOutputStream(file)); writer.write(data); writer.flush(); writer.close(); String zippedFilename = gzipFile(file.getAbsolutePath()); File zippedFile = new File(zippedFilename); zippedFile.deleteOnExit(); AmazonS3 s3 = new AmazonS3Client(new PropertiesCredentials( new FileInputStream("AwsCredentials.properties"))); String bucketName = "mybucket"; String key = "test/" + zippedFile.getName(); s3.putObject(new PutObjectRequest(bucketName, key, zippedFile)); } public static String gzipFile(String filename) throws IOException { try { // Create the GZIP output stream String outFilename = filename + ".gz"; GZIPOutputStream out = new GZIPOutputStream(new FileOutputStream(outFilename)); // Open the input file FileInputStream in = new FileInputStream(filename); // Transfer bytes from the input file to the GZIP output stream byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } in.close(); // Complete the GZIP file out.finish(); out.close(); return outFilename; } catch (IOException e) { throw e; } } }

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• WCF: Is it safe to override the Client's Dispose method using a partial class?

  - by pdiddy

  I'd like to override the Dispose method of generated proxy (ClientBase) because of the fact that disposing of a proxy calls Close and can throw an exception when the channel is faulted. The only way I came up was to create a partial class to my generated proxy, make it inherit from IDisposable: public partial class MyServiceProxy : IDisposable { #region IDisposable Members public void Dispose() { if (State != System.ServiceModel.CommunicationState.Faulted) Close(); else Abort(); } #endregion } I did some test and my Dispose method is indeed called. Do you see any issue with this strategy? Also, I don't like the fact that I'll have to create this partial class for every generated proxy. It be nice if I was able to make my proxy inherit from a base class...

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• Define Instance Variable Outside of Method Defenition (ruby)

  - by Ell

  Hi all, I am developing (well, trying to at least) a Game framework for the Ruby Gosu library. I have made a basic event system wherebye each Blocks::Event has a list of handlers and when the event is fired the methods are called. At the moment the way to implement an event is as follows: class TestClass attr_accessor :on_close def initialize @on_close = Blocks::Event.new end def close @on_close.fire(self, Blocks::OnCloseArgs.new) end end But this method of implementing events seems rather long, my question is, how can I make a way so that when one wants an event in a class, they can just do this class TestClass event :on_close def close @on_close.fire(self, Blocks::OnCloseArgs.new) end end Thanks in advance, ell.

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• ODBC Connection Pooling

  - by beansy

  I have inherited a suite of .Net c# applications from a developer which talk to an Informix database on a unix server. Instead of using the usual practices for managing the database connections (disposable pattern / "open late / close early"), the code seems to open one ODBC connection when each app loads and doesn't close it. Connection pooling is turned via the ODBC administrator. Is there any way of seeing how many ODBC connections are open? What is the effect of turning off connection pooling? Am I right in thinking the .NET framework will use connection pooling anyway?

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• problem with closing sockets

  - by Samantha

  Hi, I'm trying to write a client/server program with threads. I close the socket once the connexion is finished. The servers gets plenty of new connexions, and the socket number (file descriptor) increases very quickly: after 5 minutes running I was already at around file descriptor number 800! Is this a normal thing? Do threads share file descriptors? When I do close(sockfd); is the number released immediatly or after a some time? PS: I used to do with fork(), and I didn't have this issue. Thanks

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• Python UTF-16 encoding hex representation

  - by Romeno

  I have a string in Python 2.7.2 say u"\u0638". When I write it to file: f = open("J:\\111.txt", "w+") f.write(u"\u0638".encode('utf-16')) f.close() In hex it looks like: FF FE 38 06 When i print such a string to stdout i will see: '\xff\xfe8\x06'. The querstion: Where is \x38 in the string output to stdout? In other words why the string output to stdout is not '\xff\xfe\x38\x06'? If I write the string to file twice: f = open("J:\\111.txt", "w+") f.write(u"\u0638".encode('utf-16')) f.write(u"\u0638".encode('utf-16')) f.close() The hex representation in file contains byte order mark (BOM) \xff\xfe twice: FF FE 38 06 FF FE 38 06 I wonder what is the techique to avoid writting BOM in UTF-16 encoded strings?

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• How should Application.Run() be called for the main presenter of a MVP WinForms app?

  - by Mr Roys

  I'm learning to apply MVP to a simple WinForms app (only one form) in C# and encountered an issue while creating the main presenter in static void Main(). Is it a good idea to expose a View from the Presenter in order to supply it as a parameter to Application.Run()? Currently, I've implemented an approach which allows me to not expose the View as a property of Presenter: static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); presenter.Start(); Application.Run(); } The Start and Stop methods in Presenter: public void Start() { view.Start(); } public void Stop() { view.Stop(); } The Start and Stop methods in View (a Windows Form): public void Start() { this.Show(); } public void Stop() { // only way to close a message loop called // via Application.Run(); without a Form parameter Application.Exit(); } The Application.Exit() call seems like an inelegant way to close the Form (and the application). The other alternative would be to expose the View as a public property of the Presenter in order to call Application.Run() with a Form parameter. static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); Application.Run(presenter.View); } The Start and Stop methods in Presenter remain the same. An additional property is added to return the View as a Form: public void Start() { view.Start(); } public void Stop() { view.Stop(); } // New property to return view as a Form for Application.Run(Form form); public System.Windows.Form View { get { return view as Form(); } } The Start and Stop methods in View (a Windows Form) would then be written as below: public void Start() { this.Show(); } public void Stop() { this.Close(); } Could anyone suggest which is the better approach and why? Or there even better ways to resolve this issue?

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• parent process, and a child process..

  - by icelated

  I am trying to write a program that The parent process will take the arguments to main() and send the characters in them one at a time to the child process through a pipe (one call to write for each character). The child process will count the characters sent to it by the parent process and print out the number of characters it received from the parent. The child process should not use the arguments to main() in any way whatsoever. The child should return normally and not have the parent kill the child. Am i counting the arguments right? am i sending the arguments in one at a time, and am i reaping the child? #include <sys/wait.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #define size = 100; int main(int argc, char *argv[]) { int i, count =0; int c; int fdest[2]; // for pipe pid_t pid; //process IDs char buffer[BUFSIZ]; if (pipe(fdest) < 0) /* attempt to create pipe */ perror( "pipe" ); if ((pid = fork()) < 0) /* attempt to create child / parent process */ { perror( "fork" ); } /* parent process */ else if (pid > 0) { close(fdest[0]); for (i=1; i < argc; ++i) { for (c=0; c < strlen(argv[i]); ++c) { write(fdest[1], &argv[i][c], 1); } } close(fdest[1]); wait(NULL); exit(0); } else { /* child Process */ close(fdest[1]); while (read(fdest[0], &buffer, 1) > 0) { count++; } printf("\nchild: counted %d characters\n", count); } wait(NULL); exit(0); }

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• SaveFileDialog problem (C#) (VS2008)

  - by typoknig

  Hi all, I am having an issue with SaveFileDialog for some reason. All I want to do is extract data from a text box line by line and write it to a text file, then save that text file to the desktop. The first bit of code works fine (though it doesn't save to the desktop). The second bit of code is what I want to use, but when it creates the text file the text file is empty. What did I do wrong in my second bit of code? This code works, but it does not save to the desktop and it isn't as nice as the second code. //When the Save button is clicked the contents of the text box will be written to a text file. private void saveButton_Click(object sender, EventArgs e) { int textBoxLines = textBox.Lines.Count(); if (File.Exists(saveFile)) { result = MessageBox.Show("The file " + saveFile + " already exists.\r\nDo you want to replace it?", "File Already Exists!", MessageBoxButtons.YesNo); if (result == DialogResult.Yes) { TextWriter tw1 = new StreamWriter(saveFile); for (int i = 0; i < textBoxLines; i++) { tw1.WriteLine(textBox.Lines.GetValue(i)); } tw1.Close(); } if (result == DialogResult.No) { MessageBox.Show("Please move or rename existing " + saveFile + "\r\nBefore attempting to save again.", "Message"); } } else { TextWriter tw2 = new StreamWriter(saveFile); for (int i = 0; i < textBoxLines; i++) { tw2.WriteLine(textBox.Lines.GetValue(i)); } tw2.Close(); } } This code does not work, but it is what I want to use. //When the Save button is clicked the contents of the text box will be written to a text file. private void saveButton_Click(object sender, EventArgs e) { int textBoxLines = textBox.Lines.Count(); Stream saveStream; SaveFileDialog saveDialog = new SaveFileDialog(); saveDialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"; saveDialog.FilterIndex = 2; saveDialog.RestoreDirectory = true; saveDialog.FileName = (saveFile); saveDialog.InitialDirectory = (Environment.GetFolderPath(Environment.SpecialFolder.Desktop)); if (saveDialog.ShowDialog() == DialogResult.OK) { if ((saveStream = saveDialog.OpenFile()) != null) { StreamWriter tw = new StreamWriter(saveStream); for (int i = 0; i < textBoxLines; i++) { tw.WriteLine(textBox.Lines.GetValue(i)); } saveStream.Close(); } } }

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• Detecting incorrect key using AES/GCM in JAVA

  - by 4r1y4n

  I'm using AES to encrypt/decrypt some files in GCM mode using BouncyCastle. While I'm proving wrong key for decryption there is no exception. How should I check that the key is incorrect? my code is this: SecretKeySpec incorrectKey = new SecretKeySpec(keyBytes, "AES"); IvParameterSpec ivSpec = new IvParameterSpec(ivBytes); Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding", "BC"); byte[] block = new byte[1048576]; int i; cipher.init(Cipher.DECRYPT_MODE, incorrectKey, ivSpec); BufferedInputStream fis=new BufferedInputStream(new ProgressMonitorInputStream(null,"Decrypting ...",new FileInputStream("file.enc"))); BufferedOutputStream ro=new BufferedOutputStream(new FileOutputStream("file_org")); CipherOutputStream dcOut = new CipherOutputStream(ro, cipher); while ((i = fis.read(block)) != -1) { dcOut.write(block, 0, i); } dcOut.close(); fis.close(); thanks

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• Image rescale and write rescaled image file in blackberry

  - by Karthick

  I am using the following code to resize and save the file in to the blackberry device. After image scale I try to write image file into device. But it gives the same data. (Height and width of the image are same).I have to make rescaled image file.Can anyone help me ??? class ResizeImage extends MainScreen implements FieldChangeListener { private String path="file:///SDCard/BlackBerry/pictures/test.jpg"; private ButtonField btn; ResizeImage() { btn=new ButtonField("Write File"); btn.setChangeListener(this); add(btn); } public void fieldChanged(Field field, int context) { if (field == btn) { try { InputStream inputStream = null; //Get File Connection FileConnection fileConnection = (FileConnection) Connector.open(path); if (fileConnection.exists()) { inputStream = fileConnection.openInputStream(); //byte data[]=inputStream.toString().getBytes(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); int j = 0; while((j=inputStream.read()) != -1) { baos.write(j); } byte data[] = baos.toByteArray(); inputStream.close(); fileConnection.close(); WriteFile("file:///SDCard/BlackBerry/pictures/org_Image.jpg",data); EncodedImage eImage = EncodedImage.createEncodedImage(data,0,data.length); int scaleFactorX = Fixed32.div(Fixed32.toFP(eImage.getWidth()), Fixed32.toFP(80)); int scaleFactorY = Fixed32.div(Fixed32.toFP(eImage.getHeight()), Fixed32.toFP(80)); eImage=eImage.scaleImage32(scaleFactorX, scaleFactorY); WriteFile("file:///SDCard/BlackBerry/pictures/resize.jpg",eImage.getData()); BitmapField bit=new BitmapField(eImage.getBitmap()); add(bit); } } catch(Exception e) { System.out.println("Exception is ==> "+e.getMessage()); } } } void WriteFile(String fileName,byte[] data) { FileConnection fconn = null; try { fconn = (FileConnection) Connector.open(fileName,Connector.READ_WRITE); } catch (IOException e) { System.out.print("Error opening file"); } if (fconn.exists()) try { fconn.delete(); } catch (IOException e) { System.out.print("Error deleting file"); } try { fconn.create(); } catch (IOException e) { System.out.print("Error creating file"); } OutputStream out = null; try { out = fconn.openOutputStream(); } catch (IOException e) { System.out.print("Error opening output stream"); } try { out.write(data); } catch (IOException e) { System.out.print("Error writing to output stream"); } try { fconn.close(); } catch (IOException e) { System.out.print("Error closing file"); } } }

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• maintain dialog center with dynamic content

  - by mcgrailm

  I would have a dialog with the following $("#statusbox").dialog({ autoOpen: false, bgiframe: true, modal: true, width: 'auto', height:'auto', title:"Check Order Status", buttons: { Find: function() { get_status(); }, Close: function() { $(this).dialog('close'); } } }); and when the user hits the find button it runs ajax and returns orders to the dialog and it get dynamically re-sized but it only extends the box down. Is there way to make the box extend up and down so that the dialog remains centered ? also if there was enough content then it could potentially go beyond the bounds of the page so I would think I could use a max height to prevent that but what do I do if they re-size the window ? thanks for any help

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• http response to GET request - working in FF not Chromium

  - by Tyler

  For fun I'm trying to write a very simple server in C. When I send this response to Firefox it prints out the body "hello, world" but with Chromium it gives me a Error 100 (net::ERR_CONNECTION_CLOSED): Unknown error. This, I believe, is the relevant code: char *response = "HTTP/1.0 200 OK\r\nVary: Accept-Encoding, Accept-Language\r\nConnection: Close\r\nContent-Type: text/plain\r\nContent-Length:20\r\n\r\nhello, world"; if(send(new_fd, response, strlen(response), 0) == strlen(response)) { printf("sent\n"); }; close(new_fd); What am I missing? Thanks!

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• Make content at the right most in a div tag

  - by Yongwei Xing

  Hi all I have some html snippet <div id="title">This is title<span id="close">X<span><div> The width of this div is dynamical, maybe 300 600 or 800 px. I want the "X" at the right most of the div at the same line. So write a css like below: #close { margin-right:10px; } But it does not work. If I want to implement it, what should I config? Best Regards,

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• how to omit extra bits in a file?

  - by thinthinyu

  I want to omit extra bit in txt file.eg ....ÿ 0111111110111101100011011010010001 in this string we want to omit extra bit "ÿ " which is appeared when we save a binary string. Save fun is as follow. please help me. void LFSR_ECDlg::Onsave() { this-UpdateData(); CFile bitstream; char strFilter[] = { "Stream Records (*.mpl)|*.mpl| (*.pis)|*.pis|All Files (*.*)|*.*||" }; CFileDialog FileDlg(FALSE, ".mpl", NULL, 0, strFilter); if( FileDlg.DoModal() == IDOK ) { if( bitstream.Open(FileDlg.GetFileName(), CFile::modeCreate | CFile::modeWrite) == FALSE ) return; CArchive ar(&bitstream, CArchive::store); CString txt; txt=""; txt.Format("%s",m_B);//by ANO AfxMessageBox (txt);//by ANO txt=m_B;//by ANO ar <<txt;//by ANO ar.Close(); } else return; bitstream.Close();

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• connecting c# to sql-server

  - by every_answer_gets_a_point

  i am using this example to connect c# to sql server. can you please tell me what i have to include in order to be able to use sqlconnection? it must be something like: using Sqlconnection; ??? string connectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=""C:\SQL Server 2000 Sample Databases\NORTHWND.MDF"";Integrated Security=True;Connect Timeout=30;User Instance=True"; SqlConnection sqlCon = new SqlConnection(connectionString); sqlCon.Open(); string commandString = "SELECT * FROM Customers"; SqlCommand sqlCmd = new SqlCommand(commandString, sqlCon); SqlDataReader dataReader = sqlCmd.ExecuteReader(); while (dataReader.Read()) { Console.WriteLine(String.Format("{0} {1}", dataReader["CompanyName"], dataReader["ContactName"])); } dataReader.Close(); sqlCon.Close();

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• Base64 Android encode to PHP decode make error

  - by studio lambda

  I'm a french guy, so, I'm sorry for my english... I'm developing an Android App which communicate with a PHP REST service. So, when I try to encode an image file into Base64 like this : InputStream fileInputStream = context.getContentResolver().openInputStream(uri); BufferedInputStream in = new BufferedInputStream(fileInputStream); StringWriter out = new StringWriter(); int b; while ((b = in.read()) != -1) out.write(b); out.flush(); out.close(); in.close(); String encoded = new String(android.util.Base64.encode(out.toString() .getBytes(), android.util.Base64.DEFAULT)); On server side, I make : $data=base64_decode(chunk_split($base64BinaryData)); The result is that my image file is corrupted! INFO : the image is made by an Intent to android.provider.MediaStore.ACTION_IMAGE_CAPTURE Activity in Emulator mode (avd 5554) I've already read lots of discussions about similar problem but nothing fix my bug. thanks for help Regards,

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• Perl open file problem

  - by alexBrand

  I am having some trouble trying to print from a file. Any ideas? Thanks open(STDOUT,">/home/int420_101a05/shttpd/htdocs/receipt.html"); print "alex"; close(STDOUT); open(INF,"/home/int420_101a05/shttpd/htdocs/receipt.html"); $emailBody = <INF>; close(INF); print $emailBody; ERRORS: Filehandle STDOUT reopened as INF only for input at ./test.c line 6. print() on closed filehandle STDOUT at ./test.c line 9.

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• HttpURLConnection does not read the whole respnse

  - by Peter Szanto

  I use HttpURLConnection to do HTTP POST but I dont always get back the full response. I wanted to debug the problem, but when I step through each line it worked. I thought it must be a timing issue so I added Thread.sleep and it really made my code work, but this is only a temporary workaround. I wonder why is this happening and how to solve. Here is my code: URL u = new URL(url); URLConnection c = u.openConnection(); InputStream in = null; String mediaType = null; if (c instanceof HttpURLConnection) { //c.setConnectTimeout(1000000); //c.setReadTimeout(1000000); HttpURLConnection h = (HttpURLConnection)c; h.setRequestMethod("POST"); //h.setChunkedStreamingMode(-1); setAccept(h, expectedMimeType); h.setRequestProperty("Content-Type", inputMimeType); for(String key: httpHeaders.keySet()) { h.setRequestProperty(key, httpHeaders.get(key)); if (logger.isDebugEnabled()) { logger.debug("Request property key : " + key + " / value : " + httpHeaders.get(key)); } } h.setDoOutput(true); h.connect(); OutputStream out = h.getOutputStream(); out.write(input.getBytes()); out.close(); mediaType = h.getContentType(); logger.debug(" ------------------ sleep ------------------ START"); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } logger.debug(" ------------------ sleep ------------------ END"); if (h.getResponseCode() < 400) { in = h.getInputStream(); } else { in = h.getErrorStream(); } It genearates the following HTTP headers POST /emailauthentication/ HTTP/1.1 Accept: application/xml Content-Type: application/xml Authorization: OAuth oauth_consumer_key="b465472b-d872-42b9-030e-4e74b9b60e39",oauth_nonce="YnDb5eepuLm%2Fbs",oauth_signature="dbN%2FWeWs2G00mk%2BX6uIi3thJxlM%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1276524919", oauth_token="", oauth_version="1.0" User-Agent: Java/1.6.0_20 Host: test:6580 Connection: keep-alive Content-Length: 1107 In other posts it was suggested to turn off keep-alive by using the http.keepAlive=false system property, I tried that and the headers changed to POST /emailauthentication/ HTTP/1.1 Accept: application/xml Content-Type: application/xml Authorization: OAuth oauth_consumer_key="b465472b-d872-42b9-030e-4e74b9b60e39", oauth_nonce="Eaiezrj6X4Ttt0", oauth_signature="ND9fAdZMqbYPR2j%2FXUCZmI90rSI%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1276526608", oauth_token="", oauth_version="1.0" User-Agent: Java/1.6.0_20 Host: test:6580 Connection: close Content-Length: 1107 the Connection header is "close" but I still cannot read the whole response. Any idea what do I do wrong?

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• Java HTTP Request Occasionally Hangs

  - by behrk2

  Hello Everyone, For the majority of the time, my HTTP Requests work with no problem. However, occasionally they will hang. The code that I am using is set up so that if the request succeeds (with a response code of 200 or 201), then call screen.requestSucceeded(). If the request fails, then call screen.requestFailed(). When the request hangs, however, it does so before one of the above methods are called. Is there something wrong with my code? Should I be using some sort of best practice to prevent any hanging? The following is my code. I would appreciate any help. Thanks! HttpConnection connection = (HttpConnection) Connector.open(url + connectionParameters); connection.setRequestMethod(method); connection.setRequestProperty("WWW-Authenticate", "OAuth realm=api.netflix.com"); if (method.equals("POST")) { connection.setRequestProperty("Content-type", "application/x-www-form-urlencoded"); } int responseCode = connection.getResponseCode(); System.out.println("RESPONSE CODE: " + responseCode); if (connection instanceof HttpsConnection) { HttpsConnection secureConnection = (HttpsConnection) connection; String issuer = secureConnection.getSecurityInfo() .getServerCertificate().getIssuer(); UiApplication.getUiApplication().invokeLater( new DialogRunner( "Secure Connection! Certificate issued by: " + issuer)); } if (responseCode != 200 && responseCode != 201) { screen.requestFailed("Unexpected response code: " + responseCode); connection.close(); return; } String contentType = connection.getHeaderField("Content-type"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); InputStream responseData = connection.openInputStream(); byte[] buffer = new byte[20000]; int bytesRead = 0; while ((bytesRead = responseData.read(buffer)) > 0) { baos.write(buffer, 0, bytesRead); } baos.close(); connection.close(); screen.requestSucceeded(baos.toByteArray(), contentType); } catch (IOException ex) { screen.requestFailed(ex.toString()); }

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• How to show the elapsed time while a long SQL Query is executed?

  - by Salvador

  i need to show a popup window before the a query execution, show the time elapsed while the sql query is executed , and close that windows when the query ends. actually i do something like this var frm : tFrmPopupElapsed; // this form have a ttimer and a tlabel to show the elapsed time //but the tlabel is not updated, i tried using update; and refresh; but nothing happens //the timer is enabled. begin frm:=tform.create(nil); frm.Init;//this procedure set the timer to enabled:=true try frm.Show(); ExecuteMyVeryLongQuery(); finally frm.Close; end; end; wich is the best way using a ttimer? a Tthread ? thanks in advance.

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• wonder about some #define tricks

  - by kingkai

  Whlie reading codes of my group project, I come across many DEFINEs, and some of them seems strange. To generalize it, please look at the following 2 examples. Example 1: #define SNPRINTF(dst, fmt, arg...) snprintf(dst, sizeof(dst), fmt, ##arg) what does "##" means in this circumstance? I've tried to delete both of them, and write codes like "char buf[1024]; SNPRINTF(buf,"%s,%s","abcd","efg");" which produced the same result. So "##" seems no use and no harm to me. Example 2: #define CLOSE(fd) do { \ if (-1 != (fd)) { \ close(fd); \ (fd) = -1; \ } \ } while (0) Necessary to stuff the inner code to the do{}while(0) statement? what's the use? Thanks!

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• Does Google App Engine allow creation of files and folders on the server ?

  - by Frank

  I know Google App Engine offers free space, but I wonder if it's for storing data in it's database only or does it also allow me to create files and directories on the server side to store my data ? For instance can I use the following method to save file ? public static void saveFile(String File_Path,StringBuffer Str_Buf,boolean Append) { FileOutputStream fos=null; BufferedOutputStream bos=null; try { fos=new FileOutputStream(File_Path,Append); bos=new BufferedOutputStream(fos); for (int j=0;j<Str_Buf.length();j++) bos.write(Str_Buf.charAt(j)); } catch (Exception e) { e.printStackTrace(); } finally { try { if (bos!=null) { bos.close(); bos=null; } if (fos!=null) { fos.close(); fos=null; } } catch (Exception ex) { ex.printStackTrace(); } } } Frank

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• browser cookie issue

  - by George2

  Hello everyone, In my previous understanding, for a web site, only login user of a web site (no matter what login/authentication approach is used) could have cookie as persistent identifier, so that if the user close the browser, open browser again to go to the same web site, the web site could remember the user. But I learned recently that it seems for non-login user, there could still be a cookie associated with the user (after the user close browser, and then open the browser again to go to the same web site, the web site could remember the user), and it is called browser cookie? Is that true? If it is true, who is responsible to set the browser cookie? i.e. need some coding/config at web server side, client browser configuration (without coding from server side), or both? How could web server access such cookie? Appreciate if any code samples. thanks in advance, George

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