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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312"> <META NAME="Author" CONTENT="wdg"> <META NAME="GENERATOR" CONTENT="Mozilla/4.03 [en] (Win95; I) [Netscape]"> <TITLE>fi</TITLE></HEAD><BODY> <BR> <P>函数名: imagesize<BR>功 能: 返回保存位图像所需的字节数<BR>用 法: unsigned far imagesize(int left, int top, int right, intbottom);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <stdio.h><BR>#include <conio.h><P>#define ARROW_SIZE 10<P>void draw_arrow(int x, int y);<P>int main(void)<BR>{<BR> /* request autodetection */<BR> int gdriver = DETECT, gmode, errorcode;<BR> void *arrow;<BR> int x, y, maxx;<BR> unsigned int size;<P> /* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");<P> /* read result of initialization */<BR> errorcode = graphresult();<BR> if (errorcode != grOk) /* an error occurred */<BR> {<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR> exit(1); /* terminate with an errorcode */<BR> }<P> maxx = getmaxx();<BR> x = 0;<BR> y = getmaxy() / 2;<P> /* draw the image to be grabbed */<BR> draw_arrow(x, y);<P> /* calculate the size of the image */<BR> size = imagesize(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE);<P> /* allocate memory to hold the image */<BR> arrow = malloc(size);<P> /* grab the image */<BR> getimage(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE,arrow);<P> /* repeat until a key is pressed */<BR> while (!kbhit())<BR> {<BR> /* erase old image */<BR> putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);<P> x += ARROW_SIZE;<BR> if (x >= maxx)<BR> x = 0;<P> /* plot new image */<BR> putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);<BR> }<P> /* clean up */<BR> free(arrow);<BR> closegraph();<BR> return 0;<BR>}<P>void draw_arrow(int x, int y)<BR>{<BR> /* draw an arrow on the screen */<BR> moveto(x, y);<BR> linerel(4*ARROW_SIZE, 0);<BR> linerel(-2*ARROW_SIZE, -1*ARROW_SIZE);<BR> linerel(0, 2*ARROW_SIZE);<BR> linerel(2*ARROW_SIZE, -1*ARROW_SIZE);<BR>}<BR> <BR> <BR> <P>函数名: initgraph<BR>功 能: 初始化图形系统<BR>用 法: void far initgraph(int far *graphdriver, int far *graphmode,<BR> char far *pathtodriver);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <stdio.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> /* request auto detection */<BR> int gdriver = DETECT, gmode, errorcode;<P> /* initialize graphics mode */<BR> initgraph(&gdriver, &gmode, "");<P> /* read result of initialization */<BR> errorcode = graphresult();<P> if (errorcode != grOk) /* an error occurred */<BR> {<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR> exit(1); /* return with error code */<BR> }<P> /* draw a line */<BR> line(0, 0, getmaxx(), getmaxy());<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <P>函数名: inport<BR>功 能: 从硬件端口中输入<BR>用 法: int inp(int protid);<BR>程序例:<P>#include <stdio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> int result;<BR> int port = 0; /* serial port 0 */<P> result = inport(port);<BR> printf("Word read from port %d = 0x%X\n", port, result);<BR> return 0;<BR>}<BR> <BR> <P>函数名: insline<BR>功 能: 在文本窗口中插入一个空行<BR>用 法: void insline(void);<BR>程序例:<P>#include <conio.h><P>int main(void)<BR>{<BR> clrscr();<BR> cprintf("INSLINE inserts an empty line in the text window\r\n");<BR> cprintf("at the cursor position using the current text\r\n");<BR> cprintf("background color. All lines below the emptyone\r\n");<BR> cprintf("move down one line and the bottom line scrolls\r\n");<BR> cprintf("off the bottom of the window.\r\n");<BR> cprintf("\r\nPress any key to continue:");<BR> gotoxy(1, 3);<BR> getch();<BR> insline();<BR> getch();<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: installuserdriver<BR>功 能: 安装设备驱动程序到BGI设备驱动程序表中<BR>用 法: int far installuserdriver(char far *name, int (*detect)(void));<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <stdio.h><BR>#include <conio.h><P>/* function prototypes */<BR>int huge detectEGA(void);<BR>void checkerrors(void);<P>int main(void)<BR>{<BR> int gdriver, gmode;<P> /* install a user written device driver */<BR> gdriver = installuserdriver("EGA", detectEGA);<P> /* must force use of detection routine */<BR> gdriver = DETECT;<P> /* check for any installation errors */<BR> checkerrors();<P> /* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");<P> /* check for any initialization errors */<BR> checkerrors();<P> /* draw a line */<BR> line(0, 0, getmaxx(), getmaxy());<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<P>/* detects EGA or VGA cards */<BR>int huge detectEGA(void)<BR>{<BR> int driver, mode, sugmode = 0;<P> detectgraph(&driver, &mode);<BR> if ((driver == EGA) || (driver == VGA))<BR> /* return suggested video mode number*/<BR> return sugmode;<BR> else<BR> /* return an error code */<BR> return grError;<BR>}<P>/* check for and report any graphics errors */<BR>void checkerrors(void)<BR>{<BR> int errorcode;<P> /* read result of last graphics operation */<BR> errorcode = graphresult();<BR> if (errorcode != grOk)<BR> {<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR> exit(1);<BR> }<BR>}<P>函数名: installuserfont<BR>功 能: 安装未嵌入BGI系统的字体文件(CHR)<BR>用 法: int far installuserfont(char far *name);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <stdio.h><BR>#include <conio.h><P>/* function prototype */<BR>void checkerrors(void);<P>int main(void)<BR>{<BR> /* request auto detection */<BR> int gdriver = DETECT, gmode;<BR> int userfont;<BR> int midx, midy;<P> /* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P> /* check for any initialization errors */<BR> checkerrors();⌨️ 快捷键说明
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