函数名: setvbuf
头文件：<stdio.h>
函数原型: int setvbuf(FILE *stream, char *buf, int type, unsigned size);
功 能: 把缓冲区与流相关
参数： FILE *stream 要关联的流
char *buf 要相关联的缓冲区
int type 关联的类型
unsigned size 关联的大小
返回值：成功 返回0 ，失败 返回非0
程序例: 将缓冲区与流实现指定大小，指定类型的关联
#include<stdio.h>
int main(void){
char bufr[512];
FILE *input = fopen("file.in", "rb+");
if(!input){
printf("can not open the file\n");
}
FILE *output = fopen("file.out", "w");
if(!output){
printf("can not open the file\n");
}
if (setvbuf(input, bufr, _IOFBF, 512)){
printf("failed to set up buffer for input file\n");
}else{
printf("buffer set up for input file\n");
}
if (setvbuf(output, NULL, _IOLBF, 512)) {
printf("failed to set up buffer for output file\n");
}else{
printf("buffer set up for output file\n");
}
fclose(input);
fclose(output);
return 0;
}
运行结果
can not open the file failed to set up buffer for input file buffer set up for output file
本文固定URL：https://www.dotcpp.com/course/538