I'm porting some C++ code to VB.NET which creates a print job consisting of several pages. Every page has a template of graphical objects (text, lines, curves, etc) which stays the same on each page, and overlaid on top of that is the different data for each page. The template is created at the start of the print job as an in-memory met...
I need a 2d political map of the world on which I will draw icons, text, and lines that move around. Users will interact with the map, placing and moving the icons, and they will zoom in and out of the map. The Google Maps interface isn't very far from what I need, but this is NOT web related; it's a Windows MFC application and I want ...
I need a standard, Microsoft delivered, encryption library that works for both .NET 2.0 and C++. What would you suggest? We find that AES is only offered in .NET 3.5 (and available in C++) We find that Rijndael is used in .NET 2.0 but not available in the standard C++ libraries. If I am wrong (very good chance), can you point me in th...
What's a better way to start a thread? I'm trying to determine what are the advantages/disadvantages of _beginthread, _beginthreadex and CreateThread. All of these functions return a thread handle to a newly created thread, I already know that CreateThread provides a little extra information when an error occurs (it can be checked by c...
What is the standard encoding of C++ source code, and does standard even say something about it? For example, can I write C++ source in UNICODE? Like, use non-ASCII characters in comments? Can I use chinese characters in comments (is full UNICODE allowed or just that 16-bit first page or whatever it's called). Further more, can I use...
Hello I would like to create infrastructure to handle events for my opengl project. It should be similar to what wpf has - 3 types of events - direct, tunneling, bubbling. I then want to handle events such as mouse up, down, move etc. How should i approach this problem? Is there any library to handle this. thanks ...
I have an input file that I want to sort based on timestamp which is a substring of each record. I want to store multiple attributes of the The list is currently about 1000 records. But, I want it to be able to scale up a bit just in case. When I did it with a Linked List by searching the entire list for insertion it took about 20 s...
I'm building a GUI class for C++ and dealing a lot with pointers. An example call: mainGui.activeWindow->activeWidget->init(); My problem here is that I want to cast the activeWidget pointer to another type. activeWidget is of type GUI_BASE. Derived from BASE I have other classes, such as GUI_BUTTON and GUI_TEXTBOX. I want to cast...
I am reasonably proficient in C++, but I do not have a lot of experience using the cast operators to convert pointers of one type to another. I am familiar with the risks and benefits of pointer casting, as well as the evils of using C-style casts. What I am looking for is a primer on the proper ways to use the various cast operators in ...
I need to store a double as a string. I know I can use printf if I wanted to display it, but I just want to store it in a string variable so that I can store it in a map later. ...
Is their a way to use a non-member non-friend function on an object using the same "dot" notation as member functions? Can I pull a (any) member out of a class, and have users use it in the same way they always have? Longer Explanation: Scott Meyers, Herb Sutter, et all, argue that non-member non-friend functions are a part of an obje...
I've created a DLL project in VS 2005 for native Win32/unmanaged C++, call it myProj.dll. It depends on a 3rd-party commercial DLL that in turn depends on msvcr90.dll (I assume it was built from a VS 2008 project). I'll call it thirdParty.dll. My DLL project builds just fine in VS2005. I've built a test app (again, VS 2005 Win32 C++)...
I don't understand how GCC works under Linux. In a source file, when I do a: #include <math.h> Does the compiler extract the appropriate binary code and insert it into the compiled executable OR does the compiler insert a reference to an external binary file (a-la Windows DLL?) I guess a generic version of this question is: Is ther...
In my application i have double (or float) variables that might be "empty", as in holding no valid value. How can i represent this condition with the built in types float and double? One option would be a wrapper that has a float ad a boolean, but that can´t work, as my libraries have containers that store doubles and not objects that b...
Hi folks, How can i parse integers passed to an application as command line arguments if the app is unicode? Unicode apps have a main like this: int _tmain(int argc, _TCHAR* argv[]) argv[?] is a wchar_t*. That means i can´s use atoi. How can i convert it to an integer? is stringstream the best option? ...
So I am currently learning C++ and decided to make a program that tests my skills I have learned so far. Now in my code I want to check if the value that the user enters is a double, if it is not a double I will put a if loop and ask them to reenter it. The problem I have is how do I go about checking what type of variable the user enter...
Hi, As a background, I am a developer of an opensource project, a c++ library called openframeworks, that is a wrapper for different libraries, like opengl, quicktime, freeImage, etc. In the next release, we've added a c++ library called POCO, which is similar to boost in some ways in that it's an alternative for java foundation libra...
I'll phrase this in the form of an example to make it more clear. Say I have a vector of animals and I want to go through the array and see if the elements are either dogs or cats? class Dog: public Animal{/*...*/}; class Cat: public Animal{/*...*/}; int main() { vector<Animal*> stuff; //cramming the dogs and cats in... for(/*all ele...
Hi friends. Can you tell me how can I use threads in C++ programs, and how can I compile it as it will be multithreaded? Can you tell me some good site where I can start from root? Thanks ...
I am using CODBCRecordset (a class found on CodeProject) to find a single record in a table with 39 columns. If no record is found then the call to CRecordset::Open is fine. If a record matches the conditions then I get an Out of Memory exception when CRecordset::Open is called. I am selecting all the columns in the query (if I change th...