227 Archived Topics
Remove Filter  | I have two pages, header.php and sidebar.php which I want to include on several pages using: [code] <?php include 'header.php'; ?> <?php include 'sidebar.php'; ?> [/code] However, there are two different issues. On this page [url]http://ewh.ieee.org/r1/schenectady/New/index.php[/url] , the included text is put BELOW the text on index.php, even thought it … |
| | Currently at the top of every page I have this: [code] <HTML> <HEAD> <TITLE>Schenectady Section of the IEEE</TITLE> <META NAME='url' CONTENT='http://www.ewh.ieee.org/r1/schenectady/'> <META NAME='author' CONTENT='Authorname'> <META NAME='email' CONTENT='author email'> <META NAME='expires' CONTENT=''> <META NAME='revision-date' CONTENT='6-Sep-1999'> <META NAME='keywords' CONTENT='Schenectady Section'> <META NAME='description' CONTENT='Schenectady Section of the IEEE'> </HEAD> [/code] If I move …  |
| | I have recently taken over as a volunteer webmaster for this website: [url]http://www.ewh.ieee.org/r1/schenectady/newsletter.html[/url] Under the "Schenectady Section News" heading, you can see that there are a bunch of simple pages that all look the same. The current process to add a new one is to copy and paste an old … |
| | I put a simple script: [code] <? php print "Hello world"; ?> [/code] here: [url]http://ewh.ieee.org/r1/schenectady/HelloWorld.php[/url] When I go to the page, I don't see "Hello world" displayed. Does that mean PHP is not enabled on the server? Thanks, David |
| | When trying to pass a template parameter to another template, I am getting an 'invalid template parameter' error. I even tried to force it with 'typename' with no success. Can anyone see what's wrong with this? [code] #include <itkImage.h> #include <itkImageFileWriter.h> #include <itkRescaleIntensityImageFilter.h> template <class T> void WriteImage(typename T::Pointer image, …  |
| | If I use a template function with T where T = itk::Image<unsigned char>::Pointer, everything is fine: [code] #include <itkImage.h> class Test { public: template <class T> void Add(T patch); }; template <class T> void Test::Add(T patch) { } int main(int, char*[]) { Test a; itk::Image<unsigned char>::Pointer image; a.Add(image); return EXIT_SUCCESS; … |
| | I have a line like this: [code] <EMBED SRC="ObtainingAndBuilding_Linux.swf" WIDTH=200 HEIGHT=300</EMBED> [/code] that I want to replace 200 and 300 by the browser window width and height. I found some code like this which correctly gets and displays the width and height: [code] <HTML> <head> <script> function showWH(){ if (document.all){ … |
| | I have a folder A with files 001.jpg, 002.jpg, etc I also have a folder B with different files but with the same names; 001.jpg, 002.jpg, etc I want to put all the files in the same directory - is there something that will automatically rename them or something so … |
| | After reading some tutorials it looks like this is how to embed a video with html5: [code] <html> <body> <video width="560" height="340" controls> <source src="big_buck_bunny.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'> </video> </body> </html> [/code] (That video is in the same directory has the .html file) When I do this, I see the … |
| | In the past when I've done this: [code] int function(int a) { if(a == 2) { return true; } else { return false; } } [/code] the compiler has complained that the function may not return a value. I've fixed this by adding: [code] int function(int a) { if(a == … |
| | I just learned about heaps today. It looks like STL wants you to create a heap by first creating a vector, then using make_heap from <algorithm>: [code] std::vector<SimpleClass> Numbers(8); // ... populate ... // convert Numbers into a heap make_heap(Numbers.begin(), Numbers.end()) ; [/code] Why is there not a <heap> just …  |
| | Can anyone explain why the last line works? It seems like it is trying to cast a CRectangle as a CTriangle (which I imagine should fail?) but it outputs "5" as the function should. [code] // virtual members #include <iostream> using namespace std; class CPolygon { protected: int width, height; … |
| | Can anyone explain why this would fail: [code] assert(cap >= 0); [/code] But this passes? [code] if(cap < 0) { exit(-1); } [/code] That is, the assert is triggered, but if I replace it with conditional, the exit() function is never called. Thoughts? Thanks, David |
| | Can anyone explain why this doesn't work? [code] #include <iostream> class Parent { public: virtual int Add(int a, int b) = 0; int Add(int a) { return this->Add(a,a); } }; class Child : public Parent { public: int Add(int a, int b) { return a+b; } }; int main() { …  |
| | I am trying to remove the need to #include stl elements in my header (a requirement for a project I work on). I wrote a "wrapper" for std::vector called "MyVector". I declare a pointer to a MyVector as a member of MyClass. Then when I try to use this in … |
| | I posted a while back about how to overload << It seems all the examples online have the second argument as const, ie [code] ostream & operator << (ostream &output, const Point &p); [/code] but if I have a member function that simply returns a double [code] double Point::getX() { … |
| | With std::queue I've been using this: [code] std::queue<int>::iterator pos = std::find( q.begin(), q.end(), 5); [/code] But when I try that with std::stack : [code] std::stack<int>::iterator pos = std::find( s.begin(), s.end(), 5); [/code] I get [code] error: ‘iterator’ is not a member of ‘std::stack<int, std::deque<int, std::allocator<int> > >’ [/code] Anyone know … |
| | I hear perl is the way to go for string parsing, so here is the test! I have a file like this: [code] ... <li><a href="DSC_9866.JPG"> DSC_9866.JPG</a></li> <li><a href="DSC_9867.JPG"> DSC_9867.JPG</a></li> ... [/code] and I want to get a list of the file names. That is, the result I want is … |
| | Hi all, I have started a wiki that I hope to make the "unofficial Daniweb wiki". Its mission is to present short, compilable answers to many commonly asked questions here on the forum. [url]http://programmingexamples.net[/url] I have seeded it with a handful of basic operations. Please feel free to edit, add …  |
| | I've seen that a vector can be sorted using [code] vector<double> V; vector<int> Index; V.push_back(9); V.push_back(10); V.push_back(8); Index.push_back(0); Index.push_back(1); Index.push_back(2); sort(V.begin(), V.end()); [/code] If I want to sort Index according to how V was sorted, there is an optional third parameter to sort() that will do this. I don't understand … |
| | I've seen a few posts on here talking about "databases" as if they were just files and using fstream to manipulate the file pointer, etc. I'm familiar with SQL, so it would be nice to simply be able to execute sql command (as can be done from vb.net) such as: … |
| | (I posted this in the "Geeks Lounge" but didn't get any responses - maybe there'll be better luck here?) Hi all, I was wondering if anyone one could point me to (if they exist) some places to nominate people for enormous contributions to open source and open source philosophy? There …  |
| | I'm having a bit of trouble with dynamic_casting. I need to determine at runtime the type of an object. Here is a demo: [code] #include <iostream> #include <string> class PersonClass { public: std::string Name; virtual void test(){}; //it is annoying that this has to be here... }; class LawyerClass : … |
| | I have some white text I am putting over a very light background. Is there anyway to outline the text in black? After some googling it looks like there are some pretty complicated solutions, but I am looking for something like a check box that says "outline". Is there such … |
| | I set the .Interval of a timer to "10", which I believe means 10 milliseconds. Since there are 1000 ms in 1 second, if I count to 100, I should have 1 second, right? The problem is, if I use a physical stop watch and compare it to my program, …  |
| | Some of you may have noticed that I am always harping about "abstracting the problem" and "posting the smallest compilable piece of code that demonstrates a problem." I rambled a bit about why this is important if anyone cares to read: [url]http://daviddoria.blogspot.com/2010/05/problem-abstraction-helping-others-help.html[/url] Dave |
| | Consider these functions: [code] void OperateOnDoublePointer(double* a) { std::cout << a[0] << std::endl; } void OperateOnFloatPointer(float* a) { std::cout << a[0] << std::endl; } [/code] This works as expected: [code] double* c = new double[1]; c[0] = 3.3; OperateOnDoublePointer(c); [/code] but when I try to do this: [code] double* c … |
| | I am trying to parse the content of a wiki page. In a string like this: [code] ==Heading1== <test> some text here </test> ==Heading2== <test> even more text </test> [/code] I need to obtain "Heading1", "some text here", "Heading2" and "even more text". I got this to work: [code] import … |
| | I am trying to strip a prefix from a string, e.g. turn [code] VTK/Examples/Test [/code] Into [code] Test [/code] Sometimes the string does not contain the prefix, in which case I would expect nothing to happen. However, [code] >>> S="Main Page" >>> S.strip("VTK/Examples/") 'Main Pag' [/code] You can see that … |
| | Is there a data structure that lets me push and pop things onto/off of a queue, but also doesn't allow duplicates? E.g. I want [code] queue a; a.push(1); a.push(2); a.push(2); a.push(3); [/code] to only have 3 elements, because 2 was added twice so the second time it is just ignored. … |
| | After reading a few tutorials, it looks like this: [url]http://www.rpi.edu/~doriad/Examples/Table/[/url] should make a full (100%) width table. However, the width is actually very small and the table is on the left of the page. Does anyone see what is wrong here? Thanks, Dave |
| | This code: [code] #include <iostream> class Parent { int name; class Child { int school; void test() { std::cout << this->name; } }; }; int main(int argc, char *argv[]) { Parent MyParent; return 0; } [/code] Generates this error: [code] error: 'class Parent::Child' has no member named 'name' [/code] Is … |
| | I have some code that uses _finite (I think from float.h) that my linker complains is not declared. I think this might be a "windows only" function. Is there an equivalent function that I can call that will work cross platform? Thanks, Dave |
| | I am trying to compile some old code a colleague gave me. I have MyClass.h [code] class MyClass { public: static int UseIndex; .... }; #include "MyClass.inl" [/code] MyClass.inl [code] ... int TreeNodeData::UseIndex=1; ... [/code] I am getting: [code] multiple definition of `MyClass::UseIndex' first defined here [/code] I got several … |
| | I am trying to get a variable number of arguments in one function, and pass them to another function. I tried this: [code] #include <iostream> #include <stdarg.h> void Function1(unsigned int num, ...); void Function2(unsigned int num, va_list ap); int main(int argc, char *argv[]) { Function1(3, 1, 2, 3); return 0; … |
| | When compiling some working code on Fedora 11, I am getting this error: [code] /usr/include/c++/4.4.1/cstdarg:56: error: ‘::va_list’ has not been declared [/code] I am using: [code] [doriad@davedesktop VTK]$ g++ --version g++ (GCC) 4.4.1 20090725 (Red Hat 4.4.1-2) [/code] Does anyone know what the problem could be? Thanks, Dave |
| | I am trying to compile some software I found online. I am getting a bunch of these errors: [code] No rule to make target `/usr/lib/gcc-lib/i386-redhat-linux/3.2.2/include/stdarg.h', needed by `formCluster.o'. Stop. [/code] In the Makefiles, there are certainly lines like this: [code] transform.o: /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/include/stddef.h [/code] The errors seem to go away if … |
| | I am trying to get some code I found online to compile. It looked like this: [code] #include <iostream> #include <list> using std::list; template <class T> class leda_list : public std::list<T> { private: iterator loopIter; [/code] the error was: ‘iterator’ does not name a type I tried changing it to: … |
| | I want to make a type to differentiate degrees and radians. I wanted something like this to produce a compiler error: [code] #include <iostream> typedef double Degree; typedef double Radian; void MyFunction(Radian angle); int main() { Degree foo = 3.0; return 0; } void MyFunction(Radian angle) { std::cout << "Success." … |
| | If I go to: view -> arrange by -> current view -> customize current view -> other settings I can change the "row font" size for the current folder. If I have 100 folders and I want to change the font size for the messages in all of them, you … |
| | Why people write such cryptic code I will never understand... Can someone explain what is going on in the following: [code] double color = {1,2,3}; double *ptr; // ... assign ptr .... *ptr = *color++; ptr++; [/code] So this line [icode] *ptr = *color++; [/icode] sets the value of the … |
| | Is there a way to see what a macro gets expanded to? I tried to put it in quotes and use printf, but of course printf just printed exactly the string. The result of: [code] #define SetMacro(name,type) \ virtual void Set##name (type _arg) int main() { printf("SetMacro(Test, int)"); } [/code] … |
| | A friend of mine has a big table on his website: [url]http://www.rpi.edu/~chens/Research.html[/url] I think it looks great, so I tried to copy this style/code, but it is making too many columns: [url]http://www.rpi.edu/~doriad/TechnicalReports.html[/url] I read [url]http://www.w3.org/TR/html4/struct/tables.html[/url] , but it looks to me like I have done everything right (all it is … |
| | I have some sections like: [code] <h3>EngineeringNotes.net</h3> <br>I have never .... [/code] (see this page: [url]http://www.rpi.edu/~doriad/Personal.html[/url]) Why is there such an enormous space between the header and the text? I thought <br> should just insert a single line break? Thanks, Dave |
| | Consider two classes, PersonClass and LawyerClass. If LawyerClass derives from PersonClass, you can create a PersonClass* as a LawyerClass, like [code] PersonClass* Person = new LawyerClass; [/code] then you can convert it to a LawyerClass* with [code] LawyerClass* Lawyer = static_cast<LawyerClass*>(Person); [/code] However, if you don't know that the person … |
| | If I have the following setup: [code] Point* MyPoint = Object->GetMyPoint(); if(MyPoint->GetValue() != 2) do something; else do something else; [/code] If MyPoint is NULL or invalid, the MyPoint->GetValue() will cause a segfault. This should fix it: [code] Point* MyPoint = Object->GetMyPoint(); if(MyPoint) { if(MyPoint->GetValue() != 2) do A; else …  |
| | With this code: [url]http://www.rpi.edu/~doriad/Daniweb/maxflow/[/url] If I run [code] g++ Example.cpp graph.cpp [/code] with g++ 3.3, everything works fine. However if I run the same command with g++ 4.4, I get this error: [code] Example.cpp:(.text+0x38): undefined reference to `Graph<int, int, int>::Graph(int, int, void (*)(char*))' [/code] Does anyone know how I can … |
| | I have written an integration function (of one variable) [code] double integrate(double (*f)(double), const double a, const double b) [/code] However, now I want to integrate a function of one variable, but the c++ function has an additional parameter: [code] double f(double x, bool flag) { if(flag == true) f … |
| | With normal folders, you can right click them and say "Remove from favorite folders, as per here: [url]http://office.microsoft.com/en-us/outlook/HA011176721033.aspx[/url] However, Calendar and Contacts don't have that option. How would one remove them? Thanks, David  |
| | I am looking at some open source code and I am a bit confused. There is an Allocator class: [code] class Allocator{ [/code] Then in another class, they have: [code] class Octree{ public: static Allocator<OctNode> Allocator; [/code] When trying to compile, I am getting: [code] error: declaration of 'Allocator<OctNode<NodeData, Real> … |
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