C語言函數大全(n,o開頭)

void normvideo(void );

選擇正常亮度字符。

將文本屬性（前景和背景）置為啟動程序時它所具有的值，來選擇標准字符。

void nosound(void );

關閉由調用 sound而發聲的揚聲器。

函數名: open

功能: 打開一個文件用於讀或寫

用法: int open(char *pathname, int access[, int permiss]);

程序例:

#include
#include
#include
#include
int main(void)
{
int handle;
char msg[] = "Hello world";
if ((handle = open("TEST.$$$", O_CREAT | O_TEXT)) == -1)
{
perror("Error:");
return 1;
}
write(handle, msg, strlen(msg));
close(handle);
return 0;
}

函數名: outport

功能: 輸出整數到硬件端口中

用法: void outport(int port, int value);

程序例:

#include
#include
int main(void)
{
int value = 64;
int port = 0;
outportb(port, value);
printf("Value %d sent to port number %d\n", value, port);
return 0;
}

函數名: outportb

功能: 輸出字節到硬件端口中

用法: void outportb(int port, char byte);

程序例:

#include
#include
int main(void)
{
int value = 64;
int port = 0;
outportb(port, value);
printf("Value %d sent to port number %d\n", value, port);
return 0;
}

函數名: outtext

功能: 在視區顯示一個字符串

用法: void far outtext(char far *textstring);

程序例:

#include
#include
#include
#include
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy;
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");
/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
/* move the C.P. to the center of the screen */
moveto(midx, midy);
/* output text starting at the C.P. */
outtext("This ");
outtext("is ");
outtext("a ");
outtext("test.");
/* clean up */
getch();
closegraph();
return 0;
}

函數名: outtextxy

功能: 在指定位置顯示一字符串

用法: void far outtextxy(int x, int y, char *textstring);

程序例:

#include
#include
#include
#include
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy;
/* initialize graphics and local variables */
initgraph( &gdriver, &gmode, "");
/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
/* output text at the center of the screen*/
/* Note: the C.P. doesn't get changed.*/
outtextxy(midx, midy, "This is a test.");
/* clean up */
getch();
closegraph();
return 0;
}