Adding items to a list

Monkey666

I'll be honest, I don't really get it :/

loladiro

Yes! Let me explain. In C (and C++) an #include directive will include the file regardless of whether it has been included before. You can litterally compare this to copy'n'past-ing the header file into the source code whenever there is an #include directive. The include guards are used to make sure every header file is only included once. E.g. if your header file would usually be
@
class Dummy
{};
@
you'd have to use
@
#ifndef DUMMY_H //i.e. if dummy.h has never been included before
#define DUMMY_H //remember that it has been included

class Dummy
{};

#endif //endif after all statements
@
In your case the include guards have to enclose all of your statements (the header files not necessarily because they have their own include guards, but it's usually best to have the include guards be the first and last satements in your header files)

Monkey666

Ok so if I understand you it should be:

@
#include <windows.h>
#include <list>
#include <QString>

#ifndef PROC_H
#define PROC_H

class ProcInfo
{
public:
HANDLE Proc;
DWORD Base;
int ID;
operator QString() const
{
return QString::number(ID);
}
};

std::list<ProcInfo> procList;

bool createProcessList();
DWORD GetModuleBase(LPSTR lpModuleName, DWORD dwProcessId);

#endif // PROC_H@

But I still get the same error.

loladiro

In the compiler output window there should be information about where the compiler thinks that procList has been declared (something like "previously declared here: " )

Monkey666

c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtCore\qatomic_i386.h:125: error: first defined here

loladiro

Hmm... try to use
@ inline operator QString() const
{
return QString::number(ID);
}
@

Monkey666

Same error :( The error is on procList anyways not ProcInfo, it doesn't make alot of sense to me :/

cincirin

If you wish procList in header, you need to declare it in cpp file, and define in header as
@extern std::list< ProcInfo > procList@

dangelog

Guys. It's not a "try and guess" process. He defined a global variable inside a header. As soon as that header gets included in two or more translation units, the compiler will output multiple definitions of the same name. And the linker will complain. Put that definition in ONE translation unit and you'll be ok.

Monkey666

Works thanks :) But now I have other unrelated questions, should I post in a separate thread?

vsorokin

Yep, You do. One theme - one thread.

Monkey666

I have another question about this.

The function currently working is:

@
class ProcInfo
{
public:
HANDLE Proc;
DWORD Base;
std::string WindowName;
int ID;
inline operator QString() const
{
return QString::number(ID);
}
};
@

How would I mane the QString method return the following format:

"(" + ID + ") " + WindowName

So the output would end up something like:

(432) NotePad

cincirin

@
return QString('(') + QString::number(ID) + ')' + WindowName.c_str()
@
Also have a look at "More Efficient String Construction":http://doc.qt.nokia.com/latest/qstring.html#more-efficient-string-construction