c函数之w.txt

C常用函数 多了解一些有好处的

  函数名: wherex 
功 能: 返回窗口内水平光标位置 
用 法: int wherex(void); 
程序例: 

#include <conio.h> 

int main(void) 
{ 
clrscr(); 
gotoxy(10,10); 
cprintf("Current location is X: %d Y: %d\r\n", wherex(), wherey()); 
getch(); 

return 0; 
} 




函数名: wherey 
功 能: 返回窗口内垂直光标位置 
用 法: int wherey(void); 
程序例: 

#include <conio.h> 

int main(void) 
{ 
clrscr(); 
gotoxy(10,10); 
cprintf("Current location is X: %d Y: %d\r\n", wherex(), wherey()); 
getch(); 

return 0; 
} 




函数名: window 
功 能: 定义活动文本模式窗口 
用 法: void window(int left, int top, int right, int bottom); 
程序例: 

#include <conio.h> 

int main(void) 
{ 

window(10,10,40,11); 
textcolor(BLACK); 
textbackground(WHITE); 
cprintf("This is a test\r\n"); 

return 0; 
} 




函数名: write 
功 能: 写到一文件中 
用 法: int write(int handel, void *buf, int nbyte); 
程序例: 

#include <stdio.h> 
#include <stdlib.h> 
#include <fcntl.h> 
#include <sys\stat.h> 
#include <io.h> 
#include <string.h> 

int main(void) 
{ 
int handle; 
char string[40]; 
int length, res; 

/* 
Create a file named "TEST.$$$" in the current directory and write 
a string to it. If "TEST.$$$" already exists, it will be overwritten. 
*/ 

if ((handle = open("TEST.$$$", O_WRONLY | O_CREAT | O_TRUNC, 
S_IREAD | S_IWRITE)) == -1) 
{ 
printf("Error opening file.\n"); 
exit(1); 
} 

strcpy(string, "Hello, world!\n"); 
length = strlen(string); 

if ((res = write(handle, string, length)) != length) 
{ 
printf("Error writing to the file.\n"); 
exit(1); 
} 
printf("Wrote %d bytes to the file.\n", res); 

close(handle); 
return 0; 
} 


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