函数名: textwidth

功 能: 返回以像素为单位的字符串宽度

用 法: int far textwidth(char far *textstring);

程序例:

#include

#include

#include

#include

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int x = 0, y = 0;

int i;

char msg[80];

/* initialize graphics and local variables */

initgraph(&gdriver, &gmode, "");

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk) /* an error occurred */

{

printf("Graphics error: %s\", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1); /* terminate with an error code */

}

y = getmaxy() / 2;

settextjustify(LEFT_TEXT, CENTER_TEXT);

for (i=1; i<11; i++)

{

/* select the text style, direction, and size */

settextstyle(TRIPLEX_FONT, HORIZ_DIR, i);

/* create a message string */

sprintf(msg, "Size: %d", i);

/* output the message */

outtextxy(x, y, msg);

/* advance to the end of the text */

x += textwidth(msg);

}

/* clean up */

getch();

closegraph();

return 0;

}