I am making some project using SFML. I have downloaded library from their official site, using cmake I made VS10 project, compiled it and got all the libs and files I need. However, in my project I keep getting nonsense errors like
class "sf::SoundBuffer" has no member "LoadFromFile"
class "sf::Sound" has no member "SetBuffer"
even though I have checked in SoundBuffer header there is a function named LoadFromFile and in Sound there is a function called SetBuffer.
SoundM::SoundM(void)
{
buffer.LoadFromFile("ress/soundA.wav");
collision.SetBuffer(buffer);
}
#ifndef SOUND_H
#define SOUND_H
enum Sounds {
PaddleCollision,
Losing
};
class SoundM {
public:
SoundM(void);
void play(Sounds Sound);
private:
sf::SoundBuffer buffer;
sf::Sound collision;
};
#endif
What am I missing here?
I assume that you are using the SFML version 2.0 RC. There was a name convention change and now, all function names start with a lowercase letter (camel case).
So you should try that.
buffer.loadFromFile("ress/soundA.wav");
collision.setBuffer(buffer);
Instead of that.
buffer.LoadFromFile("ress/soundA.wav");
collision.SetBuffer(buffer);
I hope that helps you!
Related
I need to use MFC Serialization mechanism to serialize objects of class Product:
class Product : public CObject
{
protected:
string name;
int expiring;
double price;
public:
Product();
~Product();
virtual void input_data();
virtual void print_data();
};
This is simple Windows Console Application. I got an error on CObject: not a class or struct name.
I tried to make MFC Console Application following the instruction in this comment: https://stackoverflow.com/a/50320168/6543699. Now I got a lot of errors (identifier not found or identifier not declared). The text of errors is in Russian, so I don't copy them here. This is how it looks:
I don't know anything about MFC using and can't find guide where it described clearly. My questions are:
1) Is it possible to use CObject in console application (non-MFC) and how?
2) If not, what should I do to be able to use MFC serialazation? Maybe include some headers or some components were just missing while installation?
You can just adjust a console app in a couple of steps to use MFC. First is to include afx.h, like:
#include <iostream>
#include <afx.h>
Then you will want to link with the MFC dynamic libraries.
Project Properties > Configuration Properties > Advanced > Use MFC
Select: Use MFC in a Shared DLL
It should now compile with CObject.
My note, I would not use MFC serialization, at the least use Boost Serialization I gave up using any serialization a long time ago because of the constant need to maintain versioning. I found it a night mare. Unless you see that your object structure will remain fairly static, I would recommend using XML to database your objects. It is a little more work to get going but way more often than not, you don't need to worry about versioning as you make changes.
Update: I ended up getting this work by using DLLs and loading and unloading them. https://www.youtube.com/watch?v=mFSv0tf6Vwc
I know its possible because I've seen posts about this but i don't really understand them.
So i have class(DetailsLayout) that calls a method in another class(Components). At runtime i change the contents of Components to add another component that the user created to that method. I want to recompile the DetailsLayout.cpp and the Components.h but i'm confused as to how to go about this.
right now i'm trying this because of this post : Using G++ to compile multiple .cpp and .h files
system(("g++ -c ProjectComponents.hpp").c_str());
system(("g++ -c DetailsLayout.cpp").c_str());
DetailsLayout::CreateMenu();
I get an error that says g++ is not recognized as an internal or external command.
as per Jesper's suggestion ill mention what id like my end goal to be. So right now in my Game Engine i allow users to add components (that i made) to objects in the scene dynamically. When i tried to make it so that the "user" can make a component and add it dynamically i couldn't do it unless i compiled the .h and .cpp file i made for them. If i manually include the file into my project and run the method for adding the class it works but i want that to happen when i click a button for compiling.
My Components all inherit from this class.
class Component
{
public:
Component();
~Component();
virtual bool Initialize() { return true; }
virtual bool Update(float dt) { dt; return true; }
virtual bool Draw() { return true; }
template <class T> T* GetSiblingComponent()
{
return m_owner->GetComponentByType<T>();
}
protected:
Entity* m_owner;
char m_name[Imgn::MAX_NAME_LEN];
bool m_enabled;
};
I get an error that says g++ is not recognized as an internal or external command.
Well, it's not guaranteed that GCC is installed at your target machine. You have to ensure that in first place if you want to compile and run your code at arbitrary host machines.
Also you seem to miss the linking stage, and calling the resulting executable as well.
The Situation
I am writing a wrapper library for GPIB communications for setting up specific instruments according to a clients specifications to automate some of their processes. I have to use C++ and the old '98 compiler in VC++ 6.0 running on a Windows NT machine to maintain compatibility with some other devices they use regularly.
I am trying to make a class that combines some GPIB commands into easier to remember functions, while also keeping the capability of directly communicating with the instruments. To that end, I have compiled different parts of my project into different libs and dlls, each dll being a different device that they might want to communicate with. I also made a generic dll base class from which all the specific instrument classes inherit, hopefully making the whole setup as modular as possible.
The Problem
So, with all that said, I have an issue when I try to test the different dlls/modules. I created a project to test the generic base class, added the .lib file to the project, which links to the .dll, and also #included the header file for that dll. testGeneric.cpp looks like this:
#include "GENERIC.h"
void main(void) {
GPIBInstrument hp(2); //connects to device at primary address #2
hp.write("*IDN?");
}
Super simple. To be clear, I also have the GENERIC.lib linked in the "Resource Files" folder in VC++ 6.0, and I have GENERIC.dll accessible from the path variable.
Moving on, GENERIC.h looks like this (select parts):
#ifndef GENERIC_H
#define GENERIC_H
#include <string>
#include <windows.h>
#include "decl-32.h"
#ifdef GENERIC_EXPORT
#define GENERIC_API __declspec(dllexport)
#else
#define GENERIC_API __declspec(dllimport)
#endif
...(Inline exception classes)...
class GENERIC_API GPIBInstrument {
...
public:
void write(std::string command);
...
};
#endif
Just showing the relevant methods. Then GENERIC.cpp:
#define GENERIC_EXPORT
#include "GENERIC.h"
...
void GPIBInstrument::write(std::string command) {
ibwrt (handle, &command[0u], command.length());
std::cout << command << std::endl;
if (ibsta & TIMO) {
timeoutError();
}
if (ibsta & ERR) {
error("Unable to write command to instrument: " + command);
}
}
So, looks pretty good right? No issues. Compiles fine. I try running it, and BLAM! I get this: "User breakpoint called from code at 0x77f7645c". So, then I thought, well maybe it would work if I put all the code from GENERIC.h and GENERIC.cpp into one file, and #included that file all as inline code. So I tried it, and it and it compiled nicely, and ran fine.
Question (<-AHA!... But...)
What am I doing wrong!? Something with the way I'm making the .dll? Or the .lib? Or something else entirely?
EDIT (WHY!?)
So, after a bit of debugging, I found that it was something to do with passing a string literal. So I just modified it to:
std::string command = "*IDN?";
hp.write(command);
and it worked fine. My followup question, is why? What's the difference between having a string literal passed, versus assigning that to a variable and then passing it in?
Using complex types such as std::string as a parameter at a DLL boundary is tricky. You must ensure that the exe and the DLL use the exact same instance of the library code. This requires that you build them both to use the same version of the DLL version of the runtime library.
I am creating a simple library for Arduino, the intent of which is to wrap and hide another class inside of it. I would like to be able to hide the underlying class entirely from the end user.
I have somewhat simplified this example to keep things clear, but the same problem exists.
The class I am trying to wrap is the Wire library which is called TwoWire.
The header file of the wrapper library:
#ifndef __DERIVEDONEWIRE2_H__
#define __DERIVEDONEWIRE2_H__
#include <Wire.h>
class DerivedWire
{
private:
TwoWire wire;
public:
DerivedWire();
};
#endif
The CPP file:
#include "DerivedWire.h"
DerivedWire::DerivedWire()
{
}
And the Arduino sketch that uses it:
#include <DerivedWire.h>
DerivedWire derivedWire;
void setup()
{
}
void loop()
{
}
This fails to compile:
/Users/andrew/Documents/Arduino/libraries/DerivedWire/DerivedWire.h:9:
error: 'TwoWire' does not name a type
Including Wire.h at the top of the main sketch allows this to compile:
#include <DerivedWire.h>
#include <Wire.h>
DerivedWire derivedWire;
void setup()
{
}
void loop()
{
}
However I would like to completely hide from the user of the DerivedWire library that the Wire library/TwoWire class is used at all.
I have tried changing the line "TwoWire wire;" to "TwoWire* wire;" - now I get the following error:
/Users/andrew/Documents/Arduino/libraries/DerivedWire/DerivedWire.h:9:
error: ISO C++ forbids declaration of 'TwoWire' with no type
/Users/andrew/Documents/Arduino/libraries/DerivedWire/DerivedWire.h:9:
error: expected ';' before '*' token
I've tried a few other things, but it just seems that I need to include Wire.h at the top level.
How do I fix this?
The Wire instance is created on the last line in the lib.
https://github.com/lstoll/arduino-libraries/blob/master/Wire/Wire.cpp
You are NOT supposed to have multiple instances of TwoWire, and there is no reason to hide it, but if you really want to hide it, you have to remove that line.
The arduino build method requires that the lib is included from the main sketch so you can not hide that part without signifigant changes.
If you really really need to hide this Wire instance, you could copy the source of the Wire lib into your own lib, and remove that last line.
Check out the "pimpl idiom", here's a link to get you started: http://en.wikipedia.org/wiki/Opaque_pointer
Pimpl idiom is a way in C++ to hide a class implementation, and all functions that you do not want to be visible.
I think this would increase the quality of life when devving, but google came up with nothing and I couldn't find anything specific inside inside Netbeans either.
What I want is to start with this header:
class bla
{
public:
static void gfg(somearg asd);
};
Then I open the blank bla.cpp and pressed 'autoimplement'. After that, it would look like this:
#include "bla.h"
static void bla::gfg(somearg asd)
{
//TODO: implement
throw unimplemented("void bla::gfg(somearg) is unimplemented");
}
Anyone know of a tool like this?
I found http://www.radwin.org/michael/projects/stubgen/
"stubgen is a C++ development tool that keeps code files in sync with their associated headers. When it finds a member function declaration in a header file that doesn't have a corresponding implementation, it creates an empty skeleton with descriptive comment headers."
This looks like it does exactly what you want it to do.
Some time has passed and in the meantime the requested feature seems to have been implemented in netbeans. Refer to https://netbeans.org/bugzilla/show_bug.cgi?id=213811 , which also gives a description on how to use it:
Note:
Implemented CTRL+SPACE.
IDE suggest implementing of class method if CTRL+SPACE was pressed:
- inside file that already has at least one method definition
- between method declarations