[英]C - write to file faild when I put function fwrite() in a loop
I want to receive a file through a TCP socket on Linux. 我想在Linux上通过TCP套接字接收文件。 But I just get a empty file.
但我只是得到一个空文件。 However when I delete line 1 (while), anything will go okay.
但是,当我删除第1行(同时)时,一切都会好的。 My code on server looks like this:
我在服务器上的代码如下所示:
while(1)
{
FILE *fp = fopen(file_name, "w");
if(NULL == fp)
{
printf("File:\t%s Can Not Open To Write\n", file_name);
exit(1);
}
bzero(buffer, BUFFER_SIZE);
int length = 0;
while((length = recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)
{
if(fwrite(buffer, sizeof(char), length, fp) < length)
{
printf("File:\t%s Write Failed\n", file_name);
break;
}
bzero(buffer, BUFFER_SIZE);
}
One thing I can make sure is that "if(fwrite(...))" do execude cause I put a putchar('a') out of if() and I can get some "a" on my screen. 我可以确定的是,“ if(fwrite(...))”确实执行了,因为我在if()中放了一个putchar('a'),并且在屏幕上可以看到一些“ a”。 All data will be transfered through socket new_server_socket_fd
所有数据将通过套接字new_server_socket_fd传输
返回之前请先关闭文件。
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