I have some legacy MFC apps, and I'd like to use the Cairo drawing engine to add some charts and graphs. I'm searching for a small example of how to get that to work. Basically, once I've created a PNG or GIF file, how do I get that show up in an MFC CView window? My google-fu is not finding any good clues. ...
Given the following program #include <iostream> using namespace std; void foo( char a[100] ) { cout << "foo() " << sizeof( a ) << endl; } int main() { char bar[100] = { 0 }; cout << "main() " << sizeof( bar ) << endl; foo( bar ); return 0; } outputs main() 100 foo() 4 The questions: Why is the array passed as a point...
How can i hash (std::tr1::hash or boost::hash) a c++ pointer-to-member-function? Example: I have several bool (Class::*functionPointer)() (not static) that point to several diferent methods of the class Class and i need to hash those pointer-to-member-function. How can i do that? Also how can i compare (std::less) those member funct...
Can i get the file name of the current playing track/video from windows media player? It will be a small program, written in c++. I have some experience in c++ but no knowledge about this kind of problem. It would be great to show me a way to learn, to start building something ...
Hi, I am starting a multiplatform (Win Xp, Linux) qt project. I want to use an out of source build so my directory structure is as followed: project/ CMakeLists.txt (global CMake file, includes other CMakeLists) build/ (my build directory) libA/ CMakeLists.txt mystuff/ subprojectA/ CMakeLists.txt s...
Hi, I've recently implemented some vectored exception handling to catch errors in our software. This is especially useful as we've just converted from vc6 to vs2005. We're encountering a few problems with the use of the STL library (generally people doing things they shouldn't). I'm trying to catch these errors with my vectored exceptio...
I created a QTableView with a QSqlTableModel. By standard, double-clicking on the cells will mark them and the user can edit them. I want, that the user isn't allowed to do that. He is allowed to mark the whole row by clicking on a single cell, but not to edit the cell. How can I do that? ...
Simplified version of the code: Foo.h: class Foo { private: class Bar { // ... }; typedef std::map<int, Bar> mapType; mapType _map; public: void method(mapType::iterator it); }; Foo.cpp: void Foo::method(mapType::iterator it) { // ... notMethod(it); } void notMetho...
Hello All, I am trying to write a simple audit class that takes input via operator << and writes the audit after receiving a custom manipulator like this: class CAudit { public: //needs to be templated CAudit& operator << ( LPCSTR data ) { audittext << data; return *this; } //attempted manipulator s...
Hi I need to extend the CListControl class in C++/MFC, which will add several new features in the list control, Any one have good sample code ? Or could you please tell me how can i start it ? Thanks in advance! Or just write the new features and listControl into a ActiveX or COM ?? Which is better ? ...
42 as unsigned int is well defined as "42U". unsigned int foo = 42U; // yeah! How can I write "23" so that it is clear it is an unsigned short int? unsigned short bar = 23; // booh! not clear! EDIT so that the meaning of the question is more clear: template <class T> void doSomething(T) { std::cout << "unknown type" << std::...
I'm using boost sparse matrices holding bool's and trying to write a comparison function for storing them in a map. It is a very simple comparison function. Basically, the idea is to look at the matrix as a binary number (after being flattened into a vector) and sorting based on the value of that number. This can be accomplished in this ...
Where does the C++ standard declare that the pair of iterators passed to std::vector::insert must not overlap the original sequence? Edit: To elaborate, I'm pretty sure that the standard does not require the standard library to handle situations like this: std::vector<int> v(10); std::vector<int>::iterator first = v.begin() + 5; std::v...
The GNU C++ (g++ -pedantic -Wall) accepts this: typedef int MyInt; class Test { public: MyInt foo(); void bar(MyInt baz); }; int Test::foo() { return 10; } void Test::bar(int baz) { } int main(void) { Test t; t.bar(t.foo()); return 0; } Is it legal C++? Are other compilers likely to accept it? ...
Hi, Is there a way to define circular references without using pointers? I need to have somthing like this: struct A; struct B { A a; }; struct A { B b; }; Thanks! ...
i have a 3d stl vector, vector<vector<vector<double> > > mdata; i also have a function myfun(const double ya[]); to be more precise, it's a function from the GNU Scientific Library, gsl_spline_init(gsl_spline * spline, const double xa[], const double ya[], size_t size); but this is not related to my problem. so now i want to pa...
my assignment requires me to write a function that reads in a title and return the corresponding fee to the calling function. if the title is not in the list, return -1.0. as per my previous question, im a noob on c++, and this is what i have got at the moment: struct eventType { string title; double fees; }; eventType even...
Hi I have a TCP connection opened between Symbian and a Server machine and I would like to transfer huge chunks of data (around 32K) between these two endpoints. Unfortuantely, the performance figures are pretty poor and I am looking for ideas how I could improve my implementation. One of the things I tried was to increase the number of...
Hi, I'm trying to use the functionality of the example iPhone app AQOfflineRenderTest in my app (this app specifically isn't important, I just thought it worth mentioning). I have a C++ file with method called: void DoAQOfflineRender(CFURLRef sourceURL, CFURLRef destinationURL) I'm trying to call this from my Cocoa Objective-C c...
Using a trick (described by Olivier Langlois), I can determine whether a class has a type defined: template<typename T> struct hasType { template<typename C> static char test( typename C::Type ); template<typename C> static char* test(...); enum{ Value= sizeof(test<T>(0))==1 }; }; I can also determine whether a class has a...