满缓冲，满了再写行缓冲，一行就写无缓冲默认的情况，操作系统帮你管理缓冲区自己管，#define _IOFBF 0x0000 full 缓冲区满了再干活#define _IOLBF 0x0040 line 行缓冲#define _IONBF 0x0004 No 无缓冲
用法示例 1 char str[4096] = {0}; 2 setvbuf(stdout,str, _IOFBF, 4096); 3 fprintf(stdout, "hello \n"); 4 fflush(stdout); 5 system("pause");
设置文件缓冲区实时写入 1 void main() 2 { 3 4 FILE *pf = fopen("C:\\2.txt", "w"); 5 setvbuf(pf, NULL, _IONBF, 0); 6 fputs("1234567890", pf); 7 8 system("pause"); 9 }
转载于:https://www.cnblogs.com/xiaochi/p/8458000.html
