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  • initialize a const array in a class initializer in C++

    - by Nathan Fellman
    I have the following class in C++: class a { const int b[2]; // other stuff follows // and here's the constructor a(void); } The question is, how do I initialize b in the initialization list, given that I can't initialize it inside the body of the function of the constructor, because b is const? This doesn't work: a::a(void) : b([2,3]) { // other initialization stuff } Edit: The case in point is when I can have different values for b for different instances, but the values are known to be constant for the lifetime of the instance.

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  • Naming guidelines with C#.

    - by VansFannel
    Hello! I have this class: class DoSomething { private int timesDone; ... } Which is the right way to named variable 'timesDone'? Sometimes I see named as m_timesDone. Is this correct? Where I can find information about naming guidelines? Thank you!

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  • What does "Contract can't be in try block" mean?

    - by MatthewMartin
    I'm using the 3.5 library for microsoft code contracts public object RetrieveById(int Id) { Contract.Ensures(newObject != null, "object must not be null"); return newProject; //No error message if I move the Contract.Ensures to here //But it isn't asserting/throwing a contract exception here either } I get the compiler message: "Error 18 Contract section within try block in method 'Controller.RetrieveById(System.Int32)'

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  • How to handle null response for json object

    - by user1494754
    I get a JSON response as { "edges": [], "nodes": [] } how to check if the objects has null values and handle the case?? JSONObject jobj = new JSONObject(line); JSONArray jArray = jobj.getJSONArray("edges"); if(jArray.length()!=0) { for(int i=0;i<jArray.length();i++){ JSONObject json_data = jArray.getJSONObject(i); x.add((float) json_data.getInt("x")); y.add((float) json_data.getInt("y")); end This retrurns me : org.json.JSONException: end of input at character 0 of

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  • C underscore prototype syntax

    - by lobsterriffic
    I was trying to compile a ruby module, and my compiler choked. I think it might have something to do with a line in ruby.h: void rb_check_type _((VALUE,int)); I've never seen this _ syntax before. What does it mean? Could it cause problems for my compiler (Visual Studio)?

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  • Threads in C# [Question]

    - by blez
    Thread1/2: do TotalThreads-- on their exit int TotalThreads = 2; void AsyncFunc() { // run thread for Func() } void Func() { // run Thread1 // run Thread2 while(TotalThreads > 0) { /* do nothing */ } // some code } is that bad design?

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  • Android: ListAdapter populating image (icon) source

    - by user117701
    I'm populating a list from the DB, and i have a image field in the DB which contains a URL to a image file. ListAdapter adapter=new SimpleCursorAdapter(this, R.layout.row, constantsCursor, new String[] {"title", "subtitle", "image"}, new int[] {R.id.value, R.id.title, R.id.icon}); However, the other fields are populated, but the image remains empty. Why?

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  • execl doesn't work in a while(1) cicle, server side; C script

    - by Possa
    Hi guys, I have a problem with a little C script who should run as a server and launch a popup for every message arriving. The execl syntax is correct because if I try a little script with main() { execl(...); } it works. When I put it in a while(1) cicle it doesn't work. Everything else is working, like printf or string operation, but not the execl. Even if I fork it doesn't work. I really don't know what I can do ... can anyone help me? Thanks in advice for your help and sorry for my bad english. Here's the complete server C code. #include <arpa/inet.h> #include <netinet/in.h> #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <unistd.h> #include <string.h> #define BUFLEN 512 #define PORT 9930 void diep(char *s) { perror(s); exit(1); } int main() { struct sockaddr_in si_me, si_other; int s, i, slen=sizeof(si_other), broadcastPermission; char buf[100], zeni[BUFLEN]; if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1) diep("socket"); broadcastPermission = 1; if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (void *) &broadcastPermission, sizeof(broadcastPermission)) < 0) diep("setsockopt() failed"); memset((char *) &si_me, 0, sizeof(si_me)); si_me.sin_family = AF_INET; si_me.sin_port = htons(PORT); si_me.sin_addr.s_addr = htonl(INADDR_ANY); if (bind(s, &si_me, sizeof(si_me))==-1) diep("bind"); while (1) { if (recvfrom(s, buf, BUFLEN, 0, &si_other, &slen)==-1) diep("recvfrom()"); //printf("Received packet from %s:%d\nData: %s\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port), buf); strcpy(zeni, ""); strcat(zeni, "zenity --warning --title Hack!! --text "); strcat(zeni, buf); printf("cmd: %s\n", zeni); //system (zeni); execl("/usr/bin/zenity", "/usr/bin/zenity", "--warning", "--title", "Warn!", "--text", buf, (char *) NULL); } close(s); return 0; }

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  • How to invoke the getView method in the baseAdapter in Android from another WebService Bean?

    - by greysh
    The adapter in my code as follows, I extends the base adapter: @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder vHolder; // if (convertView == null) { vHolder = new ViewHolder(); convertView = mInflater.inflate(R.layout.home_item, null); vHolder.albumIcon = (ImageView) convertView .findViewById(R.id.albumIcon); try { Bitmap icon = aws.getAlbumImg(itemInfolist.get(position) .getAlbumInfoCol().get(0).getAlbumID(), 0); if (icon != null) { vHolder.albumIcon.setImageBitmap(icon); } else { vHolder.albumIcon.setImageBitmap(BitmapFactory.decodeResource( context.getResources(), R.drawable.album)); } } catch (Exception e) { vHolder.albumIcon.setImageBitmap(BitmapFactory.decodeResource( context.getResources(), R.drawable.album)); } convertView.setTag(vHolder); return convertView; } However, I download the imagine asynchronously, When invoke Bitmap icon = aws.getAlbumImg(itemInfolist.get(position).getAlbumInfoCol().get(0).getAlbumID(), 0); Some pictures which haven't downloaded will use the default image, after these picutures have downloaded in another Web Service Bean, I want the Web Service bean sends a message to invoke the getView method in this adapter in order to implement the auto refresh function. But if I change the Web Service Download Bean as follows,it will cause the exception 03-19 07:46:33.241: ERROR/AndroidRuntime(716): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. HomeAdapter mHomeAdapter; public AlbumWS(HomeAdapter homeAdapter) { mHomeAdapter = homeAdapter; } And after download, public boolean getAlbumImgWS(final ArrayList albumIDs) { new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub AlbumInfoWS aiws = new AlbumInfoWS(); for (int i = 0; i < albumIDs.size(); ++i) { if (ABSCENTALBUMIMGS.contains(albumIDs.get(i))) { continue; } if (FunctionUtil.isExist(albumIDs.get(i))) { continue; } String urlPath = aiws.getAlbumImage("en_US", Config.IMG_ATTIBUTETYPE, albumIDs.get(i)); boolean ret = FunctionUtil.simpleDownload(Config.HOST + urlPath, "/data/data/com.greysh.amped/img/" + albumIDs.get(i) + ".jpg"); if (!ret) { if (!ABSCENTALBUMIMGS.contains(albumIDs.get(i))) { ABSCENTALBUMIMGS.add(albumIDs.get(i)); } } mHomeAdapter.notifyDataSetChanged(); } } }).start(); return true; }

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  • SQL-wrappers (activerecord) to recommened for python?

    - by Horace Ho
    is there an activerecord (any similar SQL-wrapper) for python? which is good for: used in a server-side python script light-weight supports MySQL what I need to do: insert (filename, file size, file md5, the file itself) into (string, int, string, BLOB) columns if the same file (checksum + filename) does not exist in db thx

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  • c# list comparer use two compare elements

    - by senzacionale
    private class CompAdvertisements : IComparer<Advertisements> { private string OrderBy { get; set; } public CompAdvertisements(string orderBy) { OrderBy = orderBy; } #region IComparer<Advertisements> Members public int Compare(Advertisements x, Advertisements y) { return x.Country.Name.CompareTo(y.Country.Name); Can i also user x.Name.CompareTo(y.Name); in comparer that i will compare with two elements lik order by something and order by something2

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  • how to solve syntax error in procedure in mysql?

    - by Shooter
    Hi all, i am executing a procedure in mysql, procedure is- delimiter $$ create procedure getFacility (in id int, out MyFacility VARCHAR(200)) begin select Facility into MyFacility from facilities where FacilityID = id ; end $$ delimiter ; and it is giving error below- Error Code : 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'end $$ delimiter' at line 1 (0 ms taken) how to solve this error? Thanks, Yugal

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  • Returning different data types C#

    - by user1810659
    i have create a class library (DLL) with many different methods. and the return different types of data(string string[] double double[]). Therefore i have created one class i called CustomDataType for all the methods containing different data types so each method in the Library can return object of the custom class and this way be able to return multiple data types I have done it like this: public class CustomDataType { public double Value; public string Timestamp; public string Description; public string Unit; // special for GetparamterInfo public string OpcItemUrl; public string Source; public double Gain; public double Offset; public string ParameterName; public int ParameterID; public double[] arrayOfValue; public string[] arrayOfTimestamp; // public string[] arrayOfParameterName; public string[] arrayOfUnit; public string[] arrayOfDescription; public int[] arrayOfParameterID; public string[] arrayOfItemUrl; public string[] arrayOfSource; public string[] arrayOfModBusRegister; public string[] arrayOfGain; public string[] arrayOfOffset; } The Library contains methods like these: public CustomDataType GetDeviceParameters(string deviceName) { ...................... code getDeviceParametersObj.arrayOfParameterName; return getDeviceParametersObj; } public CustomDataType GetMaxMin(string parameterName, string period, string maxMin) { .....................................code getMaxMingObj.Value = (double)reader["MaxMinValue"]; getMaxMingObj.Timestamp = reader["MeasurementDateTime"].ToString(); getMaxMingObj.Unit = reader["Unit"].ToString(); getMaxMingObj.Description = reader["Description"].ToString(); return getMaxMingObj; } public CustomDataType GetSelectedMaxMinData(string[] parameterName, string period, string mode) {................................code selectedMaxMinObj.arrayOfValue = MaxMinvalueList.ToArray(); selectedMaxMinObj.arrayOfTimestamp = MaxMintimeStampList.ToArray(); selectedMaxMinObj.arrayOfDescription = MaxMindescriptionList.ToArray(); selectedMaxMinObj.arrayOfUnit = MaxMinunitList.ToArray(); return selectedMaxMinObj; } As illustrated thi different methods returns different data types,and it works fine for me but when i import the DLL and want to use the methods Visual studio shwos all the data types in the CustomDataType class as suggestion for all the methods even though the return different data.This is illusrtated in the picture below. As we can see from the picture with the suggestion of all the different return data the user can get confused and choose wrong return data for some of the methods. So my question is how can i improve this. so Visual studio suggest just the belonging return data type for each method.

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  • Loading a entity IDs CSV column as hydrated entities in NHibernate

    - by James L
    I have a number of database table that looks like this: EntityId int : 1 Countries1: "1,2,3,4,5" Countries2: "7,9,10,22" I would like to have NHibernate load the Country entities identifed as 1,2,3,4,5,7,9 etc. whenever my EntityId is loaded. The reason for this is that we want to avoid a proliferation of joins, as there are scores of these collections.

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  • can I have an abstract base class with the key attribute being generic

    - by Greg
    Hi, I want to create a re-usable library. I was going to use extension methods however I run into some issues in some cases for the client to have to specify in the calling method the types. QUESTION - If I use an abstract base class as the basis, can I specify an attribute/property in the class to be generic (e.g. the key property might be an 'int' in one case, or a 'string' in another)?

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  • Working with wchar in C

    - by Richard Mar.
    I have this code: #include <stdio.h> #include <wchar.h> int main() { wchar_t *foo = L"ðh"; wprintf(L"[%ls]\n", foo); return 0; } And when I compile it, it gives me the implicit declaration of function ‘wprintf’ warning. I know that I should link the wchar library during compilation, but how do I do that?

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  • When would isSearchable return false for an Oracle JDBC column?

    - by Ian Varley
    In what cases would a call to java.sql.ResultSetMetaData.isSearchable(int col) return false for an Oracle database? The documentation for the method doesn't really answer the question: "Indicates whether the designated column can be used in a where clause." I can think of only one case - when the column is the result of an aggregate function (in which case it would have to be part of a HAVING filter, not a WHERE filter). Are there any other cases?

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  • Handling a button click in MVC, why is there a string parameter?

    - by SLC
    I'm following this awful textbook, going through the basics of create/edit/delete records. The delete bit has a confirm button, and it is handled like so: [AcceptVerbs(HttpVerbs.Post)] public ActionResult Delete(int id, string confirmButton) { It offers no explanation of why the button is passed as a string or how MVC interprets it. Can anyone help clarify what's going on here? The Create code has no such string being passed.

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