_beginthread,在控制台任意位置显示字符

该代码改自msdn

// crt_BEGTHRD.C
// compile with: /MT /D "_X86_" /c
// processor: x86
#include <windows.h>
#include <process.h>    /* _beginthread, _endthread */
#include <stddef.h>
#include <stdlib.h>
#include <conio.h>
#include <atlbase.h>

void Bounce( void *ch );
void CheckKey( void *dummy );

/* GetRandom returns a random integer between min and max. */
#define GetRandom( min, max ) ((rand() % (int)(((max) + 1) - (min))) + (min))

BOOL repeat = TRUE;     /* Global repeat flag and video variable */
HANDLE hStdOut;         /* Handle for console window */
CONSOLE_SCREEN_BUFFER_INFO csbi;    /* Console information structure */

/* record the count of sub thread and show it on the console screen */
int RecordSubThreadCount( int count, CHAR ch ) 
{
	COORD   coord;
	coord.X = 2;
	coord.Y = 2;
	DWORD result;

	COORD coord2;
	coord2 = coord;
	coord2.X += 4;

	char  oldChar;
	char  szCount[256];
	char  szCountOld[256];
	itoa(count, szCount, 10);

	if (0 != count){
		WriteConsoleOutputCharacter( hStdOut, szCountOld, strlen(szCountOld), coord, &result );
		WriteConsoleOutputCharacter( hStdOut, &oldChar, 1, coord2, &result);
	} 
	WriteConsoleOutputCharacter( hStdOut, szCount, strlen(szCount), coord, &result );
	WriteConsoleOutputCharacter( hStdOut, &ch, 1, coord2, &result);
	strcpy(szCountOld, szCount);
	count ++;

	oldChar = ch;	return count;
}

int main()
{
    CHAR    ch = 'A';

    hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );

    /* Get display screen's text row and column information. */
   GetConsoleScreenBufferInfo( hStdOut, &csbi );

    /* Launch CheckKey thread to check for terminating keystroke. */
    _beginthread( CheckKey, 0, NULL );

    /* Loop until CheckKey terminates program. */
    while( repeat )
    {
		static int count = 0;

		count = RecordSubThreadCount(count, ch);		

        /* On first loops, launch character threads. */
        _beginthread( Bounce, 0, (void *) (ch++)  );

		if (ch > 'Z') ch = 'A';

        /* Wait one second between loops. */
        Sleep( 1000L );
    }
}

/* CheckKey - Thread to wait for a keystroke, then clear repeat flag. */
void CheckKey( void *dummy )
{
    _getch();
    repeat = 0;    /* _endthread implied */

}

/* Bounce - Thread to create and and control a colored letter that moves
 * around on the screen.
 *
 * Params: ch - the letter to be moved
 */
void Bounce( void *ch )
{
    /* Generate letter and color attribute from thread argument. */
    char    blankcell = 0x20;
    char    blockcell = (char) ch;
    BOOL    first = TRUE;
   COORD   oldcoord, newcoord;
   DWORD   result;

    /* Seed random number generator and get initial location. */
    srand( _threadid );
    newcoord.X = GetRandom( 0, csbi.srWindow.Right - 1 );
    newcoord.Y = GetRandom( 0, csbi.srWindow.Bottom - 1 );
    while( repeat )
    {
        /* Pause between loops. */
        Sleep( 100L );

        /* Blank out our old position on the screen, and draw new letter. */
        if( first )
            first = FALSE;
        else
			WriteConsoleOutputCharacter( hStdOut, &blankcell, 1, oldcoord, &result );
         WriteConsoleOutputCharacter( hStdOut, &blockcell, 1, newcoord, &result );

        /* Increment the coordinate for next placement of the block. */
        oldcoord.X = newcoord.X;
        oldcoord.Y = newcoord.Y;
        newcoord.X += -1;
        newcoord.Y += -1;

        /* Correct placement (and beep) if about to go off the screen. */
        if( newcoord.X < 0 )
            newcoord.X = csbi.srWindow.Right ;

       if( newcoord.Y < 0 )
            newcoord.Y = csbi.srWindow.Bottom;

        //Beep( ((char) ch - 'A') * 100, 175 );
    }
    /* _endthread given to terminate */
    _endthread();
}