[英]Write n bytes and read n bytes: sending number of bytes to read using uint16_t
I've been using these read and write functions (provided by @alk).我一直在使用这些读取和写入功能(通过@alk提供)。
The problem is that I don't know how to correctly send the uint16_t data_size;
问题是我不知道如何正确发送uint16_t data_size;
. .
Here is my actual code to send a general example buffer:这是我发送通用示例缓冲区的实际代码:
uint16_t data_size;
int retry_on_interrupt = 0;
char buffer[] = "Hello world!";
data_size = (uint16_t) sizeof(buffer);
/* sending data_size */
writen(socket, data_size, 2, retry_on_interrupt);
/* sending buffer */
writen(socket, buffer, sizeof(buffer);
And here is my actual code to receive a general example buffer:这是我接收一般示例缓冲区的实际代码:
/* receiving data_size */
readn(socket, &data_size, 2);
/* receiving buffer */
readn(socket, buffer, data_size);
But this is not working, I think because writen
requires a const char *
, instead I'm using a uint16_t
...但这不起作用,我认为是因为writen
需要一个const char *
,而我使用的是uint16_t
...
How should these calls be?这些电话应该如何? Thanks.谢谢。
Replace代替
writen(socket, data_size, 2, retry_on_interrupt);
by经过
if (-1 == writen(socket, &data_size, sizeof data_size, 1))
{
perror("writen() failed writing size");
exit(EXIT_FAILURE);
}
and replace this line并替换这一行
writen(socket, buffer, sizeof(buffer);
by经过
if (-1 == writen(socket, buffer, data_size, 1))
{
perror("writen() failed writing pay-load");
exit(EXIT_FAILURE);
}
You definitely want to add error-checking to the reading functions as well!您肯定还想为读取功能添加错误检查!
Also you want to take care of a possible endianness (byte-order) issue, when sending/receiving between to different hardware-platforms.在不同的硬件平台之间发送/接收时,您还想处理可能的字节序(字节顺序)问题。
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