Hi ppl,

I am new to network programming. I am trying to read and write binary data from and to a socket. After the corresponding transfers to and from the socket, I try to write the binary data to the file. But my source file and the file written once received from the socket are not the same. The size of both the files are same though. I am doing the file operations using fread and fwrite and the send and recv for the socket calls.......Can anyone please help me out. Thanks in advance

Lets have a look at the code then

the server is uploading the file....

while(sent_bytes < file_size)
{
write_buff=(char*)malloc(file_size);
uint32_t nread = fread(write_buff,1,1024,fp);
strcpy(write_buf,write_buff);
printf("\n%s\n",write_buf);
// writing fromthe file to the socket descriptor temp
uint32_t nwritten = write(temp, write_buf, nread);
sent_bytes += nwritten;
usleep(20000);
memset(write_buf,0,1024);
free(write_buff);
}
if((file_size-sent_bytes==0)){
fclose(fp);
}

the following snippet is for the client
//read from socket desc temp to buffer temp_write
bytes_read = read(temp, temp_write, 1024);
received_bytes+=bytes_read;
if(received_bytes<=file_descriptor[i].file_len){
if(file_descriptor[i].fd==0){
file_descriptor[i].fd++;
//opening the file for writing for first time file_descriptor[i].fp=fopen(extracted_payload_buf,"w"); fwrite(temp_write,1,bytes_read,file_descriptor[i].fp);
fflush(file_descriptor[i].fp);
}
else fwrite(temp_write,1,bytes_read,file_descriptor[i].fp); if(file_descriptor[i].file_len-received_bytes==0){
received_bytes=0; fclose(file_descriptor[i].fp);
file_descriptor[i].fd=0;
close(temp);
remove_conn(i);
}
}
}

I want to make sure if i can use read,write for socket ops and fwrite,fread for file ops. Also is the usage right.
Thanks