fgets()读取文件问题

[zcmerlin]

windows vs 2012下用C写程序，socket传输文件，客户端用fgets()读取文件并向server传输出现问题

用fgets时不能读取指定长度，而且每使用一次，读取的长度减小一个字节，不知道是哪里出bug啦

代码片段如下如下：

char sendBuf [20] = { 0 };

/*发送文件*/	 
	recv(sockClient, recvBuf, 1024, 0);
	if (!strcmp(recvBuf, "success"))		
	{
		while (!feof(p_source))
		{
			fgets (sendBuf, strlen(sendBuf), p_source);
                        printf ("%s", sendBuf);
			send (sockClient, sendBuf, strlen(sendBuf) + 1, 0);
		}
	}

结果如图：


这是哪里出问题了呀，自己找不出来，请大侠帮忙

[自信男孩]

fgets (sendBuf, strlen(sendBuf), p_source); //改成
fgets (sendBuf, 20, p_source);

fgets第二个参数是指要读取的最大长度；第一次sendBuf中没有数据，那么strlen()得到是0； fgets的功能如下： char *fgets(char *s, int size, FILE *stream); fgets() reads in at most one less than size characters from stream and stores them into the buffer pointed to by s. Reading stops after an EOF or a newline. If a newline is read, it is stored into the buffer. A terminating null byte ('\0') is stored after the last character in the buffer.

[zcmerlin]

引用 1 楼 cfjtaishan 的回复:

fgets (sendBuf, strlen(sendBuf), p_source); //改成
fgets (sendBuf, 20, p_source);

fgets第二个参数是指要读取的最大长度；第一次sendBuf中没有数据，那么strlen()得到是0； fgets的功能如下： char *fgets(char *s, int size, FILE *stream); fgets() reads in at most one less than size characters from stream and stores them into the buffer pointed to by s. Reading stops after an EOF or a newline. If a newline is read, it is stored into the buffer. A terminating null byte ('\0') is stored after the last character in the buffer.

多谢