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Adding files to projects
March 07, 2003 06:56 PM
Hi there
I want to split my project with separated .cpp, to ease managment, but even after i add a file to the project, compile it, save it and all, it still won't be able to run
For example, i can't use a variable in Draw.cpp that as been declare global in main.cpp
I tried to #include "Draw.cpp" , but not much luck
How can i split my big main.cpp into smaller module using visual c++?
thanks
-ErayMan
[edited by - ErayMan on March 7, 2003 7:56:57 PM]
731
March 07, 2003 07:26 PM
if you want to include variables into multiple C++ files what you should do is declare them in a .h file like variable.h and then do #include "variable.h" into both your main.cpp and your draw.cpp. that way your calling them from same place so less chance of a mess up and two varibles get assigned with diff values.
Eric Ranaldi a.k.a RanBlade
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122
March 08, 2003 01:10 PM
This approach may seem a bit confusing, but as you move on to bigger projects with dozens of modules, it really is The Right Thing.
MAIN.CPP : (the main program)
MAIN.H :
DRAW.CPP :
DRAW.H :
Basically the idea is to define variables and functions in your seperate .cpp files, then repeat their definitions in the .h files so that they are known (and can be used) in other parts of the program. Functions and variables that aren''t needed outside their .cpp files don''t need to be put in .h files.
I''m sure there''s better explanations of this online, but this should give you some idea.
MAIN.CPP : (the main program)
#include "main.h" // main header filefloat global_color = 0.5f;int Main(){ DrawSomeBoxes(5); // draw five boxes return 1;} MAIN.H :
#ifndef _MAIN_H_ // these prevent the main.h file from#define _MAIN_H_ // being included twice - don''t worry // about this too much, just put such a // definition at the top of each .h fileextern float global_color; // this makes sure this variable can be used in all .cpp files that include main.h#include "draw.h" // includes draw.h, which contains the // variable & function definitions for // your drawing code - so they can be // used in the rest of the program#endif DRAW.CPP :
#include "main.h" // so globalvariable can be usedvoid DrawSomeBoxes(int number) // function definition{ for (int i = 0; i<number; i++) { // This is where the global variable gets used glColor3f(global_color,global_color,global_color); // code that draws a box }}#endif DRAW.H :
#ifndef _DRAW_H_#define _DRAW_H_void DrawSomeBoxes(int number);#endif Basically the idea is to define variables and functions in your seperate .cpp files, then repeat their definitions in the .h files so that they are known (and can be used) in other parts of the program. Functions and variables that aren''t needed outside their .cpp files don''t need to be put in .h files.
I''m sure there''s better explanations of this online, but this should give you some idea.
_________"Maybe this world is another planet''s hell." -- Aldous Huxley
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