I'm trying to find a way to replace all instances of a string token in a file with another string. How can I do this in C++ with the win32 API? In other languages this is an easy thing to do, but in C++ I am just lost. EDIT: For some context, this is for a WiX custom action. So portability is not a main priority, just the most simpl...
I already asked this question on raw IP packet implementation. But I didn't get any solutions. My code: if((s = WSASocket(AF_INET, SOCK_RAW, IPPROTO_TCP, 0, 0, 0))==SOCKET_ERROR) // Socket { printf("Creation of raw socket failed."); return 0; } if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&optval, sizeof(optval))...
It is said that Blitz++ provides near-Fortran performance. Does Fortran actually tend to be faster than regular C++ for equivalent tasks? What about other HL languages of exceptional runtime performance? I've heard of a few languages suprassing C++ for certain tasks... Objective Caml, Java, D... I guess GC can make much code faster, b...
If I understand correctly, the .bss section in ELF files is used to allocate space for zero-initialized variables. Our tool chain produces ELF files, hence my question: does the .bss section actually have to contain all those zeroes? It seems such an awful waste of spaces that when, say, I allocate a global ten megabyte array, it results...
I just want to flip a boolean based on what it already is. If it's true - make it false. If it's false - make it true. Here is my code excerpt: switch(wParam) { case VK_F11: if (flipVal == true) { flipVal = false; } else { flipVal = true; } break; case VK_F12: if (otherVal == true) { otherValVal = false; } els...
In this article the keyword extern can be followed by "C" or "C++". Why would you use 'extern "C++"'? Is it practical? ...
I'm working on understanding and drawing my own DLL for PDF417 (2d barcodes). Anyhow, the actual drawing of the file is perfect, and in correct boundaries of 32 bits (as monochrome result). At the time of writing the data, the following is a memory dump as copied from C++ Visual Studio memory dump of the pointer to the bmp buffer. Eac...
I heard a few people expressing worries about "+" operator in std::string and various workarounds to speed up concatenation. Are any of these really necessary? If so, what is the best way to concatenate strings in C++? ...
Can you call C++ functions from Ada? I'm wondering if there is a way to do this directly, without doing the implementation in C and writing a C++ wrapper & and Ada wrapper, e.g. I would like to go c++ -> Ada rather than c++ -> c -> Ada. ...
I have a class with a (non smart) pointer to an interface object (lets call it pInterface) and I am building a nested class which also needs access to that interface. I am going to get around this by passing the pointer to the interface into the constructor of the nested class like so: CNestedClass someClass( pInterface, ... ); Howeve...
Suppose I have some code like this: class Visitor { public: Visitor(callBackFunction) {} void visit() { //do something useful invokeCallback(); } } class ClassThatCanBeVisited { Visitor &visitor; public: ClassThatCanBeVisited(Visitor &_visitor) : visitor(_visitor){} void s...
What's the best way to detect whether an app is running in debug mode in Managed C++/C++/CLI? ...
I've been tasked with creating a tool that can diff and merge the configuration files for my company's product. The configurations are stored as either XML or URL-encoded strings. I'm looking for a library, preferably open source with a license compatible with commercial software, that can do these diffs. Our app is written in C++, so...
How can I determine the list of files in a directory from inside my C or C++ code? I'm not allowed to execute the 'ls' command and parse the results from within my program. ...
I am doing some maintenance work involving DirectSound buffers. I would like to know how to interpret the elements in the buffer, that is, to know what each value in the buffer represents. This data is coming from a microphone. This wave format is being used: WAVEFORMATEXTENSIBLE format = { { WAVE_FORMAT_EXTENSIBLE, 1, sample_rate, s...
In C++, is there any difference between: struct Foo { ... }; and typedef struct { ... } Foo; ...
In C++, I have a class which contains an anonymous bitfield struct. I want to initialize it to zero without having to manually write out all fields. I can imagine putting the initialization in three places: Create a constructor in the bitfield Zero out in the initializer list of the constructor for the containing class Zero out in th...
Microsoft Visual Studio Unable to start program 'theprogram.exe'. This application has failed to start because the application configuration is incorrect. Review the manifest file for possible errors. Reinstalling the application may fix this problem. For more details, please see the application event log. O...
So I have a program that makes char* stuff lowercase. It does it by iterating through and manipulating the ascii. Now I know there's probably some library for this in c++, but that's not the point - I'm a student trying to get a grasp on char*s and stuff :). Here's my code: #include <iostream> using namespace std; char* tolower(char*...
Ok, let's leave the debate of whether friendship breaks encapsulation, and actually try elegantly come up with a coherent design. It is a two fold function: 1) General question on how to implement: public class A { friend class B; } 2) Why do I need this functionality? Some of my classes implement ISerializable inter...