write函数
类型C语言函数
函数名write
功 能写到一文件中
用 法int write(int handel, void *buf, int nbyte);
handel 是文件描述符；
buf是你指定的缓冲区，即指针，指向一段内存单元；
nbyte是你要写入文件指定的字节数；
返回值：写入文档的字节数（成功）；-1（出错）
程序例#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sysstat.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.
");
exit(1);
}
strcpy(string, "Hello, world!
");
length = strlen(string);
if ((res = write(handle, string, length)) != length)
{
printf("Error writing to the file.
");
exit(1);
}
printf("Wrote %d bytes to the file.
", res);
close(handle); return 0; }