Printing To Screen: Difference between revisions

For instance, using <tt>0x00</tt> as attribute byte means black-on-black (you'll see nothing). <tt>0x07</tt> is lightgrey-on-black (DOS default), <tt>0x1F</tt> is white-on-blue (Win9x's blue-screen-of-death), <tt>0x2a</tt> is for green-monochrome nostalgics.

 

 

When you print to any other page than 0, it will ''not'' appear on screen until that page is ''enabled'' or ''copied'' into the page 0 memory space.

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==Printing Strings==

If you have a pointer to video memory and want to write a string, here is how you might do it;

 

// note this example will always write to the top

// line of the screen

}

}

 

This simply cycles through each character in the string, and copies it to the appropriate place in video memory.

Here is an example implementation of the itoa() function (which is not standard, but provided by many libraries):

 

char * itoa( int value, char * str, int base )

{

return rc;

}

[http://www.strudel.org.uk/itoa/ And here is a shorter one]