Example from book, don't understand.

This is a discussion on Example from book, don't understand. within the C++ Programming forums, part of the General Programming Boards category; I am doing the 'building monster' example from the "Game Programming All in One" and there is something I dont ...

  1. #1
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    Join Date
    Aug 2003
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    Example from book, don't understand.

    I am doing the 'building monster' example from the "Game Programming All in One" and there is something I dont quite understand from the code written. I have re-written the entire thing by hand and it works fine but there are still a few peices of code that I don't know why it works. For Example the author uses code that seemingly is not declared, (has no type and no declaration) it is just used. Here is a small part of the code....
    Code:
    //ConLib Class
    enum ConColor
    {
         ConRed = 1, 
         ConGreen = 2,
         ConBlue = 4
    };
    
    class ConLib
    {
          HANDLE m_screen;
          HANDLE m_keyboard;
          
          WORD   m_TextColor;
          WORD   m_BackgroundColor;
          
          public:
                 ConLib();
                 ~ConLib();
                 
                 void SetBackgroundColor (WORD Color);
                 void SetTextColor (WORD Color);
                 void SetTitle (char * Title);
                 void SetPosision (COORD Position);
                 
                 void Clear (void);
                 void OutputString (char * String);
                 
                 void Read (char * Buffer, DWORD BufferSize);
                 int GetKey (void);
    };
    I understand the ConLib() class above.
    Code:
    ConLib::ConLib()
    {
     m_Screen = GetStdHandle (STD_OUTPUT_HANDLE);
     m_Keyboard = GetStdHandle (STD_INPUT_HANDLE);
     
     SetTextColor (ConRed | ConGreen | ConBlue);
     SetBackgroundColor (0);
    }
    
    ConLib::~ConLib()
    {
    }
    
    void ConLib::SetBackgroundColor (WORD Color)
    {
         m_BackgroundColor = 0;
         
         if (Color & ConRed)
         {
            m_BackgroundColor |= BACKGROUND_RED;
         }
         if (Color & ConGreen)
         {
            m_BackgroundColor |= BACKGROUND_GREEN;
         }
         if (Color & ConBlue)
         {
            m_BackgroundColor |= BACKGROUND_BLUE;
         }
         
         SetConsoleTextAttribute (m_Screen, m_TextColor | m_BackgroundColor);
    }
    The part in bold is what I don't understand. It is not defined anywhere else in the entire program, the author just uses it here and in many other places. It goes into it talking about how its defined...
    Code:
    BOOL SetConsoleTextAttribute (HANDLE hConsoleOutput, WORDwAttributes);
    and then goes on describing the paramaters. What I don't understand is that the code, used in the class, does not contain the type BOOL but it works. I don't know if I am asking this the right way. I just don't understand cause it looks like a function call with no type and no declaration. Why does this work and not cause errors?
    Knowledge is power and I want it all

    -0RealityFusion0-

  2. #2
    Registered User
    Join Date
    Aug 2005
    Posts
    1,267
    its a win32 api function, declared in windows.h

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