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Full Discussion: read from socket
Top Forums Programming read from socket Post 302671749 by vlm on Saturday 14th of July 2012 08:14:36 AM
Old 07-14-2012
read from socket

hello

I have a C program and I want to read data from a socket ,and especially I want a client to send a .jpg to the server.The problem I face is that no matter what the size of the photo is,my read command seems to read an amount of data and then does nothing.

Code:
while(1){
   if(read(sockdes,&c,sizeof c)<=0){
       perror("read");
       break;
   }
}

The strange thing is that perror doesn't print anything,which means that read is successful,also I checked if I closed the socket in the server code,but I do not.
 

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libssh2_sftp_read(3)						  libssh2 manual					      libssh2_sftp_read(3)

NAME
libssh2_sftp_read - read data from an SFTP handle SYNOPSIS
#include <libssh2.h> #include <libssh2_sftp.h> ssize_t libssh2_sftp_read(LIBSSH2_SFTP_HANDLE *handle, char *buffer, size_t buffer_maxlen); DESCRIPTION
handle is the SFTP File Handle as returned by libssh2_sftp_open_ex(3) buffer is a pointer to a pre-allocated buffer of at least buffer_maxlen bytes to read data into. Reads a block of data from an LIBSSH2_SFTP_HANDLE. This method is modelled after the POSIX read(2) function and uses the same calling semantics. libssh2_sftp_read(3) will attempt to read as much as possible however it may not fill all of buffer if the file pointer reaches the end or if further reads would cause the socket to block. RETURN VALUE
Number of bytes actually populated into buffer, or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket. LIBSSH2_ERROR_SOCKET_TIMEOUT - LIBSSH2_ERROR_SFTP_PROTOCOL - An invalid SFTP protocol response was received on the socket, or an SFTP operation caused an errorcode to be returned by the server. SEE ALSO
libssh2_sftp_open_ex(3) libssh2_sftp_read(3) libssh2 0.15 1 Jun 2007 libssh2_sftp_read(3)
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