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C++ Noob needs help with classes

 
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Luke



Joined: 21 Sep 2006
Posts: 5
PostPosted: Thu Sep 21, 2006 11:37 pm    Post subject: C++ Noob needs help with classes Reply with quote
Hi
I'm more or less a Noob at C++. I read 2 or three books on C++ years ago and, If one can say this about oneself, I'm a pro at PHP, but now I'm having troubles with a simple object; Here's the code of "menuitem.c"

Code:
class MainMenuItem
{
public:
    Image* icon;
    char label[16];
    int x, y;
    int textoffsetTop, textoffsetLeft;

    MainMenuItem(char pLabel, Image* pIcon)
    {
        label = pLabel;
        icon = pIcon;
    }
}


which I include in main.c with #include "menuitem.c".

The compiler tells me

Quote:
In file included from main.c:17:
menuitem.c:1: error: syntax error before 'MainMenuItem'
menuitem.c:2: error: syntax error before '{' token
menuitem.c:10: warning: return type defaults to 'int'
menuitem.c: In function 'MainMenuItem':
menuitem.c:11: error: incompatible types in assignment
menuitem.c:12: error: 'icon' undeclared (first use in this function)
menuitem.c:12: error: (Each undeclared identifier is reported only once
menuitem.c:12: error: for each function it appears in.)
menuitem.c: At top level:
menuitem.c:14: error: syntax error before '}' token
make: *** [main.o] Error 1


Can anyone help me out?
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chp



Joined: 23 Jun 2004
Posts: 313
PostPosted: Fri Sep 22, 2006 12:30 am    Post subject: Reply with quote
Building your source as C++ instead of plain C would probably help a lot. (Hint: .cpp instead of .c)
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Luke



Joined: 21 Sep 2006
Posts: 5
PostPosted: Fri Sep 22, 2006 12:35 am    Post subject: Reply with quote
I did that. Now I get these errors:

Code:
main.o: In function `main':
main.cpp:(.text+0xf0): undefined reference to `initGraphics()'
main.cpp:(.text+0xfc): undefined reference to `loadImage(char const*)'
main.cpp:(.text+0x108): undefined reference to `loadImage(char const*)'
main.cpp:(.text+0x114): undefined reference to `loadImage(char const*)'
main.cpp:(.text+0x120): undefined reference to `loadImage(char const*)'
main.cpp:(.text+0x12c): undefined reference to `loadImage(char const*)'
main.cpp:(.text+0x230): undefined reference to `clearScreen(unsigned int)'
main.cpp:(.text+0x27c): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x2d0): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x32c): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x394): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x3e8): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x3f0): undefined reference to `flipScreen()'
main.cpp:(.text+0x4a4): undefined reference to `clearScreen(unsigned int)'
main.cpp:(.text+0x4ec): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x534): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x580): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x5d8): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x630): undefined reference to `printTextScreen(int, int, char c
onst*, unsigned int)'
main.cpp:(.text+0x638): undefined reference to `flipScreen()'
collect2: ld returned 1 exit status
make: *** [pspwAMPxmb.elf] Error 1

These are basically all functions I used
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Ghoti



Joined: 31 Dec 2005
Posts: 288
PostPosted: Fri Sep 22, 2006 1:43 am    Post subject: Reply with quote
Hi I am a noob also but maybe this link helps. I guess you are using the graphics.c library for the functions and that is still c and not c++, i don't know if it is possible to combine them i have never done that but the way to do this is this (i hope :S)

http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html#faq-32.3

PS have you included all the neccesary libraries in the makefile?
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Luke



Joined: 21 Sep 2006
Posts: 5
PostPosted: Fri Sep 22, 2006 3:19 am    Post subject: Reply with quote
Quote:
i don't know if it is possible to combine them

yeah, that kinda seems to be the point :/... I think I'll stick to plain C then...

Thank you
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dot_blank



Joined: 28 Sep 2005
Posts: 498
Location: Brasil
PostPosted: Fri Sep 22, 2006 5:07 am    Post subject: Reply with quote
#include "callbacks.h"
#include "framebuffer.h"
#include "graphics.h"

....
....

class MainMenuItem
{
public:
MainMenuItem(char pLabel, Image* pIcon)
{
label = pLabel;
icon = pIcon;
};

private:
mage* icon;
char label[16];
int x, y;
int textoffsetTop, textoffsetLeft;

}; //semicolon
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Last edited by dot_blank on Sat Sep 23, 2006 9:25 am; edited 1 time in total
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danzel



Joined: 04 Nov 2005
Posts: 182
PostPosted: Fri Sep 22, 2006 5:49 am    Post subject: Reply with quote
You need a semicolon ; at the end of your class definition:

class MainMenuItem
{
public:
MainMenuItem(char pLabel, Image* pIcon)
{
label = pLabel;
icon = pIcon;
};

private:
mage* icon;
char label[16];
int x, y;
int textoffsetTop, textoffsetLeft;

};
^There
HTH. :)
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