header-files

问题 Forehand I'd like to mention I'm fairly new to C++ programming and that I'm using Ogre3D as framework (for school project reasons). I have a class Player which inherits from the GameObject class. When trying to build the project I'm confronted with the following error: Error C2504 'GameObject' : base class undefined - player.h (9) Which would imply the GameObject class is undefined within the player class' header file. However I have in fact included the GameObject header file in that of the

问题 I am writing a simple C++ app that checks whether a given exe file example:'a.exe' is running or not(windows OS), I have googled and found some code in the below link. http://stackoverflow.com/questions/3355379/how-do-i-find-out-if-a-exe-is-running-in-c The code mentioned above uses a header file "tlhelp32.h". I just copied the code and did some necessary changes then complied it in MinGW , there comes the next problem, all of the datatypes mentioned in that header files are errored out ex:

问题 This question already has answers here : Objective-C class extension (5 answers) Closed 6 years ago . What exactly are class extensions and header files? What are the differences? What is the difference between declaring a property/method in a header file vs in a class extension. I am completely new to objective-c so beginner terminology would be beneficial :) Thanks in advance! 回答1: As the name suggests, they extend the class. A class continuation is another name. The class extension is

问题 I'm trying to compile this cpp and h files but it keeps giving me this error "expected '(' for function-style cast or type construction" and it points to the constructor GasTank::GasTank(double a){ capacity=a; } Any thoughts why? I can't figure it out why it is giving me that error. Here is the rest of the code: // // Header.h // labs // // Created by Pxndroid on 10/17/14. // Copyright (c) 2014 Pxndroid. All rights reserved. // #include<string> using namespace std; class GasTank { private:

问题 I am having trouble compiling/linking the following C code. The linker throws errors that look like the following: pso.o:pso.c:(.text+0x41): undefined reference to '_ps' ... pso.o:pso.c:(.text+0x93): more undefined references to '_ps' follow This is my first time writing C code for gcc, so I'm unsure how to fix this problem. I am assuming that because struct PS is defined my header file, it is somehow not linked to pso.c. However, I did use a #include "ps.h" statement at the top of that

问题 I am working on an iOS project and include ifaddrs.h in one of my files using #include <ifaddrs.h> Recently, my code stopped working (in particular, getifaddrs ) and I noticed that BLWebSocketsServer delivers a getifaddrs.h/.c which seems to cause issues. If I remove those two files from XCodes "Headers" and "Compile Sources" phase, my code starts working again. Now, for my questions: Why does this happen? getifaddrs.h is not <ifaddrs.h> , so this shouldn'at affect my code, should it? Is

问题 Although I have read the answers to this question QT/C++ - Accessing MainWindow UI from a different class and searched the whole www for quite some time - I don't get it working. I was given the task to recreate an applications UI using QT Designer. Unfortunately there was already some UI spread all over several classes (the team then came across the idea, that using QT but not using the Designer however "handcoding" the UI seems to make little sense) So now my job is to untangle the open

问题 I am following the book - C++ Primer for learning C++. I'm in middle of the chapter introducing classes, and I'm stuck in resolving the header files include of two classes taken as example there. Here are the two classes, and the header files: ScreenCls.h: #ifndef SCREENCLS_H #define SCREENCLS_H #include <iostream> #include "WindowManager.h" using namespace std; class ScreenCls { friend void WindowManager::clear(ScreenIndex); public: typedef string::size_type pos; ScreenCls() { } ScreenCls

问题 I am using a shared library , say, shr.so . This has some header file, say, shr_struct.h with structures I need to use in my program , say, main_prog.c . Do I need to keep a copy of shr_struct.h in my include path so that I can declare objects of structure types in shr_struct.h in main_prog.c ? 回答1: If your main_prog.c depends on shr_struct.h , the compiler will need to know where this last file is located. Now if the library is installed in the system "standard" library path, you may not

问题 I'm trying to convert a String to uppercase in my header file function. However, when I try to do this I get an error saying "Cannot convert from 'class String' to 'char'. Here's my code - #ifndef PATIENT_DEMO_CLASS #define PATIENT_DEMO_CLASS // system defined preprocessor statement for cin/cout operations #include <iostream.h> // header file from book #include "tstring.h" #include <algorithm> #include <string> class PatientDemographicInformation { private: // patient's state String