I need to work with some old C++ code that was developed in Visual C++ 6.0. Right now it's giving me compile errors galore. (For instance, "cannot open include file: 'iostream.h'"... because now it should say #include <iostream> rather than #include <iostream.h>). How can I work with this code without having to change it all over the ...
I'm pretty new to QGraphicsView in Qt. As far as I can tell there is no built in way to resize a QGraphicsItem in a scene with a mouse. What I'm looking for is to be able to resize a QGraphicsRectItem by either dragging out the corners or the edges on screen. Is there a simple way to do that? Is there a library or a piece of code some...
I am using CodeGear RAD Studio C++, I know that to go to a definition of a variable or class you must press control and click on the method name, or any identifier where you want to go to a definition. However, as most of you would notice this does not work all the time. Does anyone have any trick on doing this? ...
So the other day I went to compile a VC++ project I am working on and all of a sudden I get errors in almost all of my files saying: new.h: error C2039: 'set_new_handler' : is not a member of 'std new.h: error C2039: 'set_new_handelr' : symbol cannot be used in a using-declaration "new.h" and 'set_new_handler' are not being used ...
I need to match input strings (URLs) against a large set (anywhere from 1k-250k) of string rules with simple wildcard support. Requirements for wildcard support are as follows: Wildcard (*) can only substitute a "part" of a URL. That is fragments of a domain, path, and parameters. For example, "*.part.part/*/part?part=part&part=*". The...
How would you invert a stack, without using extra data structures, like a second, or temporary, stack. Thus no stack1-stack2 or stack-queue-stack implementation in the answer. You just have access to push/pop feature of a standard stack. I think there is way to do it by keeping a global counter and using pointer manipulation. ...
How do I create a file in C++ when UAC is on, but with out running as administrator? I'm trying to create a text file in the following path: "C:\Programdata\Desktop" in VC++ 6.0 when Vista's UAC is on. However, Createfile(...) failed with 'permission denied'. When I run the sample application with "run as administrator" it works. But m...
I once worked on a C++ project that took about an hour and a half for a full rebuild. Small edit, build, test cycles took about 5 to 10 minutes. It was an unproductive nightmare. What is the worst build times you ever had to handle? What strategies have you used to improve build times on large projects? Update: How much do you think...
Is it possible to set up QtCreator to treat .d files as C sources? ...
Wanting to highlight stuff in web pages as you mouse over, but there seem to be so many ways you can set display properties I'm having trouble finding a good way to change the display so that it can change back and still keep close to what the user was already looking at. The IE 8 developer tools Outline tool does something like what I ...
Non inline function defined in header file with guards #if !defined(HEADER_RANDOM_H) #define HEADER_RANDOM_H void foo() { //something } #endif Results in linker error : Already defined in someother.obj file Making the function inline works fine but I am not able to understand why the function is already erroring out in first case. ...
It is a commonly held belief that the the C++ Standard library is not generally intended to be extended using inheritance. Certainly, I (and others) have criticised people who suggest deriving from classes such as std::vector. However, this question: http://stackoverflow.com/questions/1038482/c-exceptions-can-what-be-null made me realise...
We have some code that looks roughly like this: // Two enums that differ entirely. enum A { a1, a2 }; enum B { b1, b2 }; // Functions to convert in some meaningful way between them A convert(B); B convert(A); Now, our compiler goes and does exactly what we expect it to. convert(a1) will call B convert(A), and so on. However, when w...
I created a class CMyClass whose CTor takes a UCHAR as argument. That argument can have the values of various enums (all guaranteed to fit into a UCHAR). I need to convert these values to UCHAR because of a library function demanding its parameter as that type. I have to create a lot of those message objects and to save typing effort I ...
When I compile a project I get this error: C:\DATOSA~1\FAXENG~1>nmake /f Makefile.vc clean Microsoft (R) Program Maintenance Utility Version 9.00.21022.08 Copyright (C) Microsoft Corporation. All rights reserved. cd src nmake /nologo /f Makefile.vc clean del /F *.obj *.lib *.dll *.exe *.res *.exp cd.. ...
how do I create an embedded resource and then access it in C++? Any example on how to read the resource would be great I am using visual studio 2005 Thanks in advance Edit1: I want to put one xsd file which is required while validating schema of the recieved xml file. ...
Summary: I'm trying to write a text string to a column of type varchar(max) using ODBC and SQL Server 2005. It fails if the length of the string is greater than 8000. Help! I have some C++ code that uses ODBC (SQL Native Client) to write a text string to a table. If I change the column from, say, varchar(100) to varchar(max) and try to ...
What are the advantages and disadvantages of using one instead of the other in C++? ...
What parts of STL (no boost or TR1, please) people still commonly use in their professional as well as personal environments, if any? These days I find myself using the following: Containers: vector set map Iterators: const and not for above containers Functional objects: bind1st bind2nd Algorithms: find find_first_of f...
The following function operates with two values for T. One is 4 bytes (same as a DWORD). The other is 64 bytes. The Buffer is designed to store objects in its cache, and have them retrieved at a later date. When using the 64 byte structure, the total amount of time in the function jumps dramatically. The seek time in the vector, the...