C / C++ / MFC

4-May-04 0:46

normally, no chance... but if you compiled it in debug mode, i know borland add a tool to get back the source code. but in release mode, you can't because the code is optimised...

TOXCCT >>> GEII power

Re: Obj to Source file

Gurou4-May-04 1:24

Gurou

4-May-04 1:24

Can you tell me where i can get the borlan tool that you are mentioning about.

Regards
Guru

Re: Obj to Source file

toxcct4-May-04 1:27

Syntax error: identifier 'x' when 2 headers include each other

4-May-04 1:27

i don't think it will work with a Visual C++ compiled object file, but at www.Borland.com[^], looking for Builder

TOXCCT >>> GEII power

Ylis4-May-04 0:27

Ylis

4-May-04 0:27

I have 2 classes, and both classes needs to know of each other. Here's the headers:

sprite.h

<br />
#ifndef SPRITE_H<br />
#define SPRITE_H<br />
#include "SDL.h"<br />
#include "SDLgraphics.h"<br />
<br />
class sprite<br />
{<br />
public:<br />
	sprite( char * p_path, int p_noFrames );<br />
	void Animate( SDLgraphics &p_g );<br />
	SDL_Surface* GetSurface() { return m_image; }<br />
	SDL_Rect* GetRect() { return &m_image->clip_rect; }<br />
protected:<br />
	float m_x, m_y;<br />
	int m_noFrames;<br />
	int m_curFrame;<br />
	SDL_Surface* m_image;<br />
<br />
};<br />
#endif<br />

SDLgraphics.h

<br />
#ifndef SDLgraphics_H<br />
#define SDLgraphics_H<br />
#include <cstdio><br />
#include <cstdlib><br />
#include "SDL.h"<br />
#include "sprite.h"<br />
<br />
class SDLgraphics<br />
{<br />
public:<br />
	SDLgraphics(unsigned int p_flags);<br />
	void Init(int p_width, int p_height);<br />
	void Draw(sprite *p_sprite, SDL_Rect *p_area);<br />
	inline void Draw(sprite *p_sprite);<br />
	void Flip();<br />
protected:<br />
	SDL_Surface *m_scene;<br />
<br />
};<br />
#endif<br />

When I try to compile it in Visual Studio 7.0 .NET I get error C2061: syntax error : identifier 'SDLgraphics', and another one relating to sprite.

Greatful for any help Big Grin | :-D

Re: Syntax error: identifier 'x' when 2 headers include each other

toxcct4-May-04 0:39

Re: Syntax error: identifier 'x' when 2 headers include each other

4-May-04 0:39

declare one class before defining the other :

sprite.h
<font style="color:blue;">#ifndef</font> SPRITE_H
<font style="color:blue;">#define</font> SPRITE_H
<font style="color:blue;">#include</font> "SDL.h"
<font style="color:blue;">#include</font> "SDLgraphics.h"
 
<font style="color:blue;">class </font>sprite {
  <font style="color:blue;">public</font>:
    sprite(<font style="color:blue;">char </font>* p_path, <font style="color:blue;">int </font>p_noFrames);
    <font style="color:blue;">void </font>Animate(SDLgraphics &p_g);
    SDL_Surface* GetSurface() { <font style="color:blue;">return </font>m_image; }
    SDL_Rect* GetRect() { <font style="color:blue;">return </font>&m_image->clip_rect; }
  <font style="color:blue;">protected</font>:
    <font style="color:blue;">float </font>m_x, m_y;
    <font style="color:blue;">int </font>m_noFrames;
    <font style="color:blue;">int </font>m_curFrame;
    SDL_Surface* m_image;
};
<font style="color:blue;">#endif</font>
 
 
SDLgraphics.h
<font style="color:blue;">#ifndef </font>SDLgraphics_H
<font style="color:blue;">#define</font> SDLgraphics_H
<font style="color:blue;">#include </font><unknown_file1.h>   <font style="color:green;">// your post don't precise what file is included</font>

<font style="color:blue;">#include </font><unknown_file2.h>   <font style="color:green;">// because the "<>" are treated as HTML tags</font>

<font style="color:blue;">#include</font> "SDL.h"
<font style="color:blue;">#include </font>"sprite.h"
 
<font style="color:blue;">class </font>sprite;                <font style="color:green;">// Add this line here...</font>
<font style="color:blue;">class </font>SDLgraphics {
  <font style="color:blue;">public</font>:
    SDLgraphics(<font style="color:blue;">unsigned int </font>p_flags);
    <font style="color:blue;">void </font>Init(<font style="color:blue;">int </font>p_width, <font style="color:blue;">int </font>p_height);
    <font style="color:blue;">void </font>Draw(sprite *p_sprite, SDL_Rect *p_area);
    <font style="color:blue;">inline void </font>Draw(sprite *p_sprite);
    <font style="color:blue;">void </font>Flip();
  <font style="color:blue;">protected</font>:
    SDL_Surface *m_scene;
};
<font style="color:blue;">#endif</font>

TOXCCT >>> GEII power

Ylis4-May-04 0:54

Ylis

4-May-04 0:54

thx

Re: Syntax error: identifier 'x' when 2 headers include each other

Jens Doose4-May-04 0:39

4-May-04 0:39

Instead of including sprite.h in SDLGraphics.h try a forward declaration:

SDLgraphics.h

<br />
#ifndef SDLgraphics_H<br />
#define SDLgraphics_H<br />
#include <br />
#include <br />
#include "SDL.h"<br />
<br />
class sprite;<br />
<br />
class SDLgraphics<br />
{<br />
public<br />
...<br />

That should work in this case, because in SDLgraphics.h you only need sprite pointers.

Jens

Hooking a COM port ?

Brian van der Beek4-May-04 0:12

Brian van der Beek

4-May-04 0:12

Is it possible to monitor/hook a COM port that has been opened by another application?

SDK problem

Prakash Nadar3-May-04 23:57

Prakash Nadar

3-May-04 23:57

I have installed Pladform SDK, but my code seems to refer to old .h files and not the new .h files. How do i make them link to my new .h files?

I have updated the environment variables as well.

Thanx.

I'll write a suicide note on a hundred dollar bill - Dire Straits

Jens Doose4-May-04 0:19

4-May-04 0:19

If you build your projects from DevStudio you also have to adjust your directory settings.
In VC 6 this is done in Tools->Options->Directories->Include Files
In VC 7+8 use Tools->Options->Projects->VC++ Directories

Jens

2249174-May-04 0:39

224917

4-May-04 0:39

Tools->Options->Directories->Include Files

change the order using ALT+(UP/DOWN) ARROW and make ur platform sdk dir preferrably first one.

It's not a bug, it's an undocumented feature.
suhredayan@omniquad.com

messenger :suhredayan@hotmail.com

Prakash Nadar4-May-04 5:19

Prakash Nadar

4-May-04 5:19

Thanx for the reply, I did that as said in the microsoft site moving the directory up n down, still my app refers to old sdk files. Confused | :confused:

I'll write a suicide note on a hundred dollar bill - Dire Straits

Blake Miller6-May-04 8:25

Blake Miller

6-May-04 8:25

This might be why you keep getting the old files, even though you updated the environment and other paths.

Header files included as 'part' of project.

If the SDK header files were included into your project, then it will use the files with their existing 'old' paths. You must open the workspace tree view, go to the 'files' tab, search under 'Header Files' and see if the old files are included in the list. If so, then remove them from the list by selecting and pressing delete key. Now, when one is required by your project, the new ones whould be located instead according to the environment variables.

A question about OOP

nguyenvhn3-May-04 23:55

nguyenvhn

3-May-04 23:55

What's the difference between 2 below implementations?

Case 1:

<br />
class animal{<br />
 animal& operator=(animal& ani){<br />
   //few operations <br />
   return *this;<br />
 }<br />
}<br />

Case 2:

<br />
class animal{<br />
 animal operator=(animal& ani){<br />
   //few operations <br />
   return *this;<br />
 }<br />
}<br />

Please note the reference sign (&) in return type of overloading operator.

Which implementation is correct?

Best regards.

Re: A question about OOP

Jens Doose4-May-04 0:07

4-May-04 0:07

Case 1 is correct, because it returns a reference instead of a copy of this object.
See also:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/overl_14.asp[^]

Re: A question about OOP

toxcct4-May-04 0:09

4-May-04 0:09

when you return a reference, you will be able tou chain the operators like this:

animal MyAnimal1, MyAnimal2, MyAnimal3;                    <font style="color:green;">// Declarations</font>
MyAnimal1 = animal(<font style="color:green;">/*accepted constructor parameters*/</font>);   <font style="color:green;">// here, both of the operator=() could work</font>
MyAnimal3 = MyAnimal2 = MyAnimal1;                         <font style="color:green;">// here, it must be a reference returned</font>

in general, we prefer the synopsis T& operator= (const T&)...
make your choice Smile | :)

TOXCCT >>> GEII power

Antony M Kancidrowski3-May-04 23:13

Antony M Kancidrowski

3-May-04 23:13

It may be a typo but if the code reflects what you have in your project you have missed a D out of DeleteMedia in the .cpp file.

In my experience if the function has not been defined in the header the autocompletion does not function.

Otherwise delete the project .ncb file and reload the project. This normally fixes such glitches.

Ant.

Jens Doose3-May-04 23:17

3-May-04 23:17

Two problems:
1. Intellisense sometimes has a problem with templates.
In that case you just have to type Wink | ;-)

2. You used a wrong syntax for declaring a template.
Also the methods of a template must be defined within
the header.
See the following example:

<br />
<br />
#include <vector><br />
using namespace std;<br />
<br />
template < class T > class CPlaylist<br />
{<br />
public:<br />
  CPlaylist(T m_vPlaylist)<br />
  {<br />
  };<br />
  virtual ~CPlaylist()<br />
  {<br />
  };<br />
  void DeleteMedia(int iPosition);<br />
<br />
protected:<br />
  std::vector< T > m_vPlaylist;<br />
  ...<br />
};<br />
<br />
template < class T > void CPlaylist< T >::DeleteMedia(int iPosition)<br />
{<br />
  ...<br />
}<br />
<br />

Jens

Anonymous3-May-04 23:39

Anonymous

3-May-04 23:39

We said me that when I work with the templates I have to define the function in the header file when they are declared... Is it true ?

When I define:

std::vector <t> m_vPlaylist;

Is this call correct?

m_vPlaylist.Erase(iPosition);

When I write "m_vPlaylist." I can't see all the functions that work with vectors... For example "Erase" function.

Jens Doose4-May-04 0:12

4-May-04 0:12

Well, try it Wink | ;-)

Your linker will complain about missing functions...

You cannot define
std::vector m_vPlaylist;
since std::vector is a template and therefor
it needs a type, a specialization like
std::vector< int > m_vPlaylist;
which will generate a vector for storing ints.

But anyway you cannot call erase with an int parameter,
it takes an iterator.

Jens