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• TableView Background image going over cell textLabel

  - by Alex Trott

  Currently my tableview looks like this: as you can see, cell.textLabel and cell.detailTextLable both load this background, and i can't work out how to get them to stop loading the background, and for it only to be the backing on the cell. Here's my current code to change the cell: - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath { [cell setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"tableCell.png"]]]; } How can i get round this problem? Thanks in advance.

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• C#: Specify that a function arg must inhert from one class, and implement an interface?

  - by Rosarch

  I'm making a game where each Actor is represented by a GameObjectController. Game Objects that can partake in combat implement ICombatant. How can I specify that arguments to a combat function must inherit from GameObjectController and implement ICombatant? Or does this indicate that my code is structured poorly? public void ComputeAttackUpdate(ICombatant attacker, AttackType attackType, ICombatant victim) In the above code, I want attacker and victim to inherit from GameObjectController and implement ICombatant. Is this syntactically possible?

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• [C#] NodeMouseClick event doesn't work correctly ???

  - by Wayne

  i use a treeview to display files and folders like Windows Explorer. it has a NodeMouseClick event but sometimes when i click +, this event doesn't fire. private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e) { MessageBox.Show("node mouse click"); } can anyone explain for me why ? and how to know whenever i click + ? thanks in advance!

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• How to split data in a text file in C#.This is how my data looks: name: abcsurname: abctel:1234 and

  - by userJD

  `public void SeparateData() { //read file StreamReader sr = new StreamReader("myTextFile.txt"); //string to hold line string myline; myline = sr.ReadLine(); while ((myline = sr.ReadLine()) != null) { string[] lines = Regex.Split(myline, " "); foreach (string s in lines) { using (StreamWriter sw = new StreamWriter("myTextFile.txt")) sw.WriteLine(lines); } } } `

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• Ternary operators in C#

  - by pm_2

  With the ternary operator, it is possible to do something like the following (assuming Func1() and Func2() return an int: int x = (x == y) ? Func1() : Func2(); However, is there any way to do the same thing, without returning a value? For example, something like (assuming Func1() and Func2() return void): (x == y) ? Func1() : Func2(); I realise this could be accomplished using an if statement, I just wondered if there was a way to do it like this.

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• Why is this C program giving a wrong output?

  - by JMSA

  Why is this C program giving a wrong output? #include<stdio.h> void main() { float f = 12345.054321; printf("%f", f); getch(); } Output: 12345.054688 But the output should be, 12345.054321. I am using VC++ in VS2008.

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• Using type passed as a template in C++

  - by MeDiCS

  Is it possible to actually use the type passed as a template for control flow? I'd like to write a function that uses templates, which in turn calls another function based on the type passed: template <class T> void test_function (T var) { //Do stuff if (T == char) { bar (var); } else { foo (var); } //Do even more stuff } If not, I'll have to fallback to enums...

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• how to call async method until get success response?

  - by ppp

  I am making a async method call through a delegate. Delegate pointing to a function is a void function. How can I know that the async function has been executed successfully and if not the again call that function untill I get success response. here my code- BillService bs = new BillService(); PayAdminCommisionDelegate payCom = new PayAdminCommisionDelegate(bs.PaySiteAdminByOrderNo); payCom.BeginInvoke(OrderNo,null,null);

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• What CLR do when compare T with null, and T is a struct?

  - by Fujiy

  private static void SaveOrRemove<T>(string key, T value) { if (value == null) { Console.WriteLine("Remove: " +key); } .... } If I call passing 0 to value: SaveOrRemove("MyKey", 0), the condition (value == null) is false, then CLR dont make a (value == default(T)). What really happens?

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• Difference between [object variable] and object.variable in Obj-C?

  - by John Smith

  I was working on a program today and hit this strange bug. I had a UIButton with an action assigned. The action was something like: -(void) someaction:(id) e { if ([e tag]==SOMETAG) { //dostuff } } What confuses me is that when I first wrote it, the if line was if (e.tag==SOMETAG) XCode refused to compile it, saying error: request for member 'tag' in 'e', which is of non-class type 'objc_object*' but I thought the two were equivalent. So under what circumstances are they not the same?

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• Why fill() and copy() of Collections in java is implemented this way

  - by Priyank Doshi

  According to javadoc... Collections.fill() is written as below : public static <T> void fill(List<? super T> list, T obj) { int size = list.size(); if (size < FILL_THRESHOLD || list instanceof RandomAccess) { for (int i=0; i<size; i++) list.set(i, obj); } else { ListIterator<? super T> itr = list.listIterator(); for (int i=0; i<size; i++) { itr.next(); itr.set(obj); } } } Its easy to understand why they didn't use listIterator for if (size < FILL_THRESHOLD || list instanceof RandomAccess) condition as of RandomAccess. But whats the use of size < FILL_THRESHOLD in above? I mean is there any significant performance benefit over using iterator for size>=FILL_THRESHOLD and not for size < FILL_THRESHOLD ? I see the same approach for Collections.copy() also : public static <T> void copy(List<? super T> dest, List<? extends T> src) { int srcSize = src.size(); if (srcSize > dest.size()) throw new IndexOutOfBoundsException("Source does not fit in dest"); if (srcSize < COPY_THRESHOLD || (src instanceof RandomAccess && dest instanceof RandomAccess)) { for (int i=0; i<srcSize; i++) dest.set(i, src.get(i)); } else { ListIterator<? super T> di=dest.listIterator(); ListIterator<? extends T> si=src.listIterator(); for (int i=0; i<srcSize; i++) { di.next(); di.set(si.next()); } } } FYI: private static final int FILL_THRESHOLD = 25; private static final int COPY_THRESHOLD = 10;

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• How can make a variable (not class member) "read only" in C#

  - by devfreak

  Hi, I'm new to the C# world and I can't find a method to declare read only variable in C# (something like declaring "const" variable in c++). Is there one? I'll give you an example: ... int f() { return x; } // x is not const member ... void g() { int readOnlyVar = f(); // is there a method to declare readOnlyVar as read only or const // Some code in which I want to restrict access to readOnlyVar to read only }

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• Can anybody explain me the meaning of this expression ??

  - by de costo

  void* GetData() { return reinterpret_cast<unsigned char*>(this); } Is there a case of automatic type coercion happening in this case ??? How could I convert the object of my class to an unsigned char* ??

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• Why do we make a copy of final instance variable in a method in Java?

  - by PRK

  For instance: private final Object o; public void doSomething(){ final Object local = this.o; //access methods of local; } This practice is followed in lots of java classes (such as ArrayBlockingQueue). What's the benefit of this?

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• Explanation about a Java statement

  - by monn

  public static void main(String[] args) { int x = 1 + + + + + + + + + 2; System.out.println(x); } I can compile above method. Is there any explanation about the allowed multiple "+" operator?

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• Tricky C++ interview question

  - by Rajendra

  Given class A { public: void fun() { std::cout << "fun" << std::endl; } }; A* a = NULL; a->fun(); What will happen and why?

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• [C#] Get Index of Control in an Control-Array

  - by Cocaine112358

  I have a TextBox Array private TextBox[,] Fields = new TextBox[9, 9]; and all the TextBoxes have got the same TextChanged-Event void Field_Changed( object sender, EventArgs e ) Is there a way to get the Index of the sender in the Array (without giving each TextBox it's own EventHandler)?

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• CUDA threads for inner loop

  - by Manolete

  I've got this kernel __global__ void kernel1(int keep, int include, int width, int* d_Xco, int* d_Xnum, bool* d_Xvalid, float* d_Xblas) { int i, k; i = threadIdx.x + blockIdx.x * blockDim.x; if(i < keep){ for(k = 0; k < include ; k++){ int val = (d_Xblas[i*include + k] >= 1e5); int aux = d_Xnum[i]; d_Xblas[i*include + k] *= (!val); d_Xco[i*width + aux] = k; d_Xnum[i] +=val; d_Xvalid[i*include + k] = (!val); } } } launched with int keep = 9000; int include = 23000; int width = 0.2*include; int threads = 192; int blocks = keep+threads-1/threads; kernel1 <<< blocks,threads >>>( keep, include, width, d_Xco, d_Xnum, d_Xvalid, d_Xblas ); This kernel1 works fine but it is obviously not totally optimized. I thought it would be straight forward to eliminate the inner loop k but for some reason it doesn't work fine. My first idea was: __global__ void kernel2(int keep, int include, int width, int* d_Xco, int* d_Xnum, bool* d_Xvalid, float* d_Xblas) { int i, k; i = threadIdx.x + blockIdx.x * blockDim.x; k = threadIdx.y + blockIdx.y * blockDim.y; if((i < keep) && (k < include) ) { int val = (d_Xblas[i*include + k] >= 1e5); int aux = d_Xnum[i]; d_Xblas[i*include + k] *= (float)(!val); d_Xco[i*width + aux] = k; atomicAdd(&d_Xnum[i], val); d_Xvalid[i*include + k] = (!val); } } launched with a 2D grid: int keep = 9000; int include = 23000; int width = 0.2*include; int th = 32; dim3 threads(th,th); dim3 blocks (keep+threads.x-1/threads.x, include+threads.y-1/threads.y); kernel2 <<< blocks,threads >>>( keep, include, width, d_Xco, d_Xnum, d_Xvalid, d_Xblas ); Although I believe the idea is fine, it does not work and I am running out of ideas here. Could you please help me out here? I also think the problem could be in d_Xco which stores the position k in a smaller array , so the order matters, but I can't think of any other way of doing it...

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• Strange issue with cout

  - by ben

  After reading from a text file, and storing it into a string, I tried to pass this message into another function that will print it out. This is what it looks like: http://imgur.com/MCjfRdp void insert (int id, string message){ cout << "Inserting " << message << " at" << endl; } Somehow the message behind the string overrides the message. But once I removed the " at" after message, it worked as expected. http://imgur.com/JdHPPmi void insert (int id, string message){ cout << "Inserting " << message << endl; } I somehow suspect the problem came from stringstream, but i couldn't find out where. Here's the code that read from file vector <string> line; fstream infile; string readLine, tempLine, action, tempLine1; int level, no; infile.open(fileName.c_str(),ios::in); int i = 0; while (!infile.eof()) { getline (infile, readLine); line.push_back(readLine); } infile.close(); line.pop_back(); for (int i = 0; i < line.size();i++) { stringstream ss (line.at(i)); getline (ss, action, ' '); if (action == "init") { // some other work here } else if (action == "insert") { tempLine = line.at(i); ss >> no; stringstream iline(tempLine); getline (iline, tempLine1, ' '); getline (iline, tempLine1, ' '); getline (iline, tempLine1, '\n'); Insert (no, tempLine1); } Since my file has different kinds of actions, here is what test.dat contains: insert 0 THIS IS A TEST edit: When i did file.txt, it came out as something like this. Inserting THIS IS A TEST at Inserting THIS IS TEST NO 2 at

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• Custom route does not work in ASP.net MVC 3

  - by user603007

  I am trying to implement my custom route in ASP.net MVC 3 but I get this error: The resource cannot be found. global.asax public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "mycontroller", // Route name "{controller}/{name}", // URL with parameters new { controller = "MyController", action = "Search" } // Parameter defaults ); } MyController.cs public class MyController : Controller { public ActionResult Search(string name) { return Content(name); } }

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• Please suggest what is wrong with this string reversal fucntion(C++)?

  - by AKS

  This code is compiling clean. But when I run this, it gives exception "Access violation writing location" at line 9. void reverse(char *word) { int len = strlen(word); len = len-1; char * temp= word; int i =0; while (len >=0) { word[i] = temp[len-1]; //line9 ++i;--len; } word[i] = '\0'; }

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• Why when I try to instantiate a class instance, do I get StackOverFlowException?

  - by flockofcode

  I keep getting StackOverFlowException whenever I instantiate an instance of A class. I know it has got something to do with the fact that A.b field is of type derived from class A. But why would that cause an exception? static void Main(string[] args) { A a = new A(); // exception } class A { private B b = new B(); } class B:A {} thank you

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• How to templatize the container type in a function declaration?

  - by Kyle

  I want to write a function that accepts any container holding strings. Something like this: template <typename Container> void foo(Container<string>& stuff); But this isn't the right syntax. What's the right syntax?

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• Moving image through different x,y coordinates

  - by user525004

  I have created an array of coordinates. The centre of an image should move through those coordinates. I have used TranslateAnimation to achieve it. But during the animation the image is moving within the last two coordinates. Below is my code: private void CreateAnimationAndRun() { // move to the different coordinates one by one for(int k=0; k The above function is called on a button click.

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• What is the best way to write class template-like generic code in C?

  - by Ribtoks

  I need to write AVL-tree with generic type in C. The best way I know is to use [ void* ] and to write some functions for creating, copying, assignment and destruction. Please, tell me some better way.

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