如何在fclose之前把fwrite的内容刷新到文件中去？

[micosun6]

我用fflush也没用?

[sunhuanwen]

没用，文件句柄不关闭文件中是不会写入数据的。

[帅得不敢出门]

此刷新与此 fflush 不是同一个概念

[帅得不敢出门]

直接写到文件中不就行了.

[wuyu637]

fclose();

[micosun6]

直接写到文件??

[太乙]

#include <stdio.h>
#include <stdlib.h>



void main()
{
	FILE *fp;
	char msg[6];
	if ((fp=fopen("1.txt","w+"))==NULL)
	{
		printf("open error!");
	}
	fwrite("hello",5,1,fp);
	fflush(fp);
	fseek(fp,0,SEEK_SET);
	fread(msg,5,1,fp);
	msg[5]='\0';
	printf(msg);
	fclose(fp);
}
output：
helloPress any key to continue

[Just4life]

学习了

[太乙]

上面我举得例子不恰当，下面：

#include <stdio.h>
#include <stdlib.h>
void main()
{
	FILE *fp,*fp2;
	char msg[6];
	if ((fp=fopen("1.txt","w+"))==NULL)
	{
		printf("open error!");
	}
	fwrite("hello",5,1,fp);
	fflush(fp);
	if ((fp2=fopen("1.txt","r"))==NULL)
	{
		printf("open error!");
	}
	fread(msg,5,1,fp2);
	msg[5]='\0';
	printf(msg);
	fclose(fp);
}


output：

helloPress any key to continue



---------------------------------------------------------------------
如果去掉fflush():


#include <stdio.h>
#include <stdlib.h>
void main()
{
	FILE *fp,*fp2;
	char msg[6];
	if ((fp=fopen("1.txt","w+"))==NULL)
	{
		printf("open error!");
	}
	fwrite("hello",5,1,fp);
//	fflush(fp);
	if ((fp2=fopen("1.txt","r"))==NULL)
	{
		printf("open error!");
	}
	fread(msg,5,1,fp2);
	msg[5]='\0';
	printf(msg);
	fclose(fp);
}

output:

烫烫蘌ress any key to continue

[micosun6]

谢谢!