Windows系統下，用C在console輸出彩色


#include <windows.h>
SetConsoleTextAttribute( GetStdHandle(STD_OUTPUT_HANDLE), colorCode )


colorCode: 型態是 unsigned short ?


    將colorCode以二進位制表示:

    LRGB LRGB

    前4碼是控制 background 的顏色
    後4碼是控制 foreground 的顏色

    L: Light (亮度)
    R: Red
    G: Green
    B: Blue
=======================================================================



http://en.wikipedia.org/wiki/File:AdditiveColor.svg

windows.h裡有#define一些名稱來代表數字
    FOREGROUND_INTENSITY = 0000 1000
    FOREGROUND_RED       = 0000 0100
    ......
    BACKGROUND_GREEN     = 0010 0000
    BACKGROUND_BLUE      = 0001 0000


像混三原光一樣，調整自己想要的顏色

比方說我要顯示前景亮黃色:

colorCode = 0000 1110 //這是二進位制

或

colorCode =  

FOREGROUND_INTENSITY | FOREGROUND_RED | FOREGROUND_GREEN

下面的code用到了macro和bitwise的技巧
================================================================================
/**ConsoleColorTest.c*/
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

#define setColor(var)\
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),BinaryStringToUShort(var))

#define setColor2(var)\
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),BinaryStringToUShort(#var))

unsigned short BinaryStringToUShort( char s[] );

int main( void )
{
            // back fore
            // LRGB LRGB
    setColor( "1010 1101" );
    printf("Red + Blue = Magenta.\n");
    setColor2( 0010 1001 );
    printf("Light Blue.\n");
    setColor2( 0000 0111 );
    printf("White.\n");
    system("pause");
    return 0;
}

unsigned short BinaryStringToUShort( char s[] )
{
    unsigned short i, sum;

    sum = 0;
    for( i = 0; s[i] != '\0'; i++ )
    {
        if( s[i]==' ' ) // skip space
            continue;

        if( s[i]=='1' )
            ++sum;

        sum<<=1; // sum*=2;
    }
    sum>>=1; // sum/=2;
    return sum;
}
======================================================================

Output: