# Socket Programming Send File **URL:** \ **Category:** Programming\ **Created:** [June 23, 2009, 11:51am UTC](https://community.unix.com/t/socket-programming-send-file/243137 "2009-06-23T11:51:36Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![htabesh](https://community.unix.com/letter_avatar/htabesh/32/6_22734026db12803ebb3e059622ac3534.png) [@htabesh](https://community.unix.com/u/htabesh)\ **Post date:** [June 23, 2009, 11:51am UTC](https://community.unix.com/t/socket-programming-send-file/243137/1 "2009-06-23T11:51:36Z")
Hello my friends; Look at this 2 program: Client: ```nohighlight #include #include #include #include #include #include #include int main ( int agrc, char *argv[] ) { int Socket; struct sockaddr_in Server_Address; Socket = socket ( AF_INET, SOCK_STREAM, 0 ); if ( Socket == -1 ) { printf ("Can Not Create A Socket!"); } int Port ; Port = atoi(argv[2]); Server_Address.sin_family = AF_INET; Server_Address.sin_port = htons ( Port ); Server_Address.sin_addr.s_addr = inet_addr(argv[1]); if ( Server_Address.sin_addr.s_addr == INADDR_NONE ) { printf ( "Bad Address!" ); } connect ( Socket, (struct sockaddr *)&Server_Address, sizeof (Server_Address) ); char *path; char *filename; path = "/home/hosein/Desktop/Project-30-3/Scan.pdf"; filename = strrchr(path, '/') + 1; send(Socket,filename,sizeof(filename),0); FILE *in = fopen("1.tar.gz","r"); char Buffer[2] = ""; int len; while ((len = fread(Buffer,sizeof(Buffer),1, in)) > 0) { send(Socket,Buffer,sizeof(Buffer),0); } send(Socket,"Hi",sizeof(Buffer),0); char Buf[BUFSIZ]; recv(Socket, Buf, BUFSIZ, 0); if ( strcmp (Buf,"ACK") == 0 ) { printf("Recive ACK\n"); } close (Socket); fclose(in); return 0; } ``` Server: ```nohighlight #include #include #include #include #include #include #include int main ( int agrc, char *argv[] ) { / ********Program Variable Define & Initialize********** / int Main_Socket; // Main Socket For Server int Communication_Socket; // Socket For Special Clients int Status; // Status Of Fucntion struct sockaddr_in Server_Address; // Address Of Server struct sockaddr_in Client_Address; // Address Of Client That Communicate Whit Server int Port ; char Buff[100] = ""; Port = atoi(argv[2]); printf ("Server Communicating By Using Port %d\n", Port); / ********Create A Socket To Communicate With Server********** / Main_Socket = socket ( AF_INET, SOCK_STREAM, 0 ); if ( Main_Socket == -1 ) { printf ("Sorry System Can Not Create Socket!\n"); } / ********Create A Address For Server To Communicate********** / Server_Address.sin_family = AF_INET; Server_Address.sin_port = htons(Port); Server_Address.sin_addr.s_addr = inet_addr(argv[1]); / ********Bind Address To Socket********** / Status = bind ( Main_Socket, (struct sockaddr*)&Server_Address, sizeof(Server_Address) ); if ( Status == -1 ) { printf ("Sorry System Can Not Bind Address to The Socket!\n"); } / ********Listen To The Port to Any Connection********** / listen (Main_Socket,12); socklen_t Lenght = sizeof (Client_Address); while (1) { Communication_Socket = accept ( Main_Socket, (struct sockaddr*)&Client_Address, &Lenght ); if (!fork()) { char CH[8]; recv(Communication_Socket, CH, sizeof(CH), 0); printf("%s\n",CH); FILE *fp=fopen("sample.tar.gz","w"); while(1) { char Buffer[2]=""; if (recv(Communication_Socket, Buffer, sizeof(Buffer), 0)) { if ( strcmp (Buffer,"Hi") == 0 ) { break; } else { fwrite(Buffer,sizeof(Buffer),1, fp); } } } fclose(fp); send(Communication_Socket, "ACK" ,3,0); printf("ACK Send"); exit(0); } } return 0; } ``` If I declare CH[x] ( x \<= 8 ), everything work right and file will send in a true way. but with CH[x] ( x \> 8 ) I can't send file! what's the problem?😕 ---
**Author:** ![pludi](https://community.unix.com/user_avatar/community.unix.com/pludi/32/1278_2.png) [@pludi](https://community.unix.com/u/pludi)\ **Post date:** [June 23, 2009, 12:05pm UTC](https://community.unix.com/t/socket-programming-send-file/243137/2 "2009-06-23T12:05:57Z")
Let me guess, you're compiling on a 64bit architecture. sizeof() is a compile-time instruction and will, in your case, return the size of the pointer for the character array. Try declaring the a macro for the size of the array & use that macro for the recv() call. ---
**Author:** ![htabesh](https://community.unix.com/letter_avatar/htabesh/32/6_22734026db12803ebb3e059622ac3534.png) [@htabesh](https://community.unix.com/u/htabesh)\ **Post date:** [June 23, 2009, 12:50pm UTC](https://community.unix.com/t/socket-programming-send-file/243137/3 "2009-06-23T12:50:07Z")
No! I don't use 64 bit architecture! I try strlen() instead of sizeof()! there is problem JUST in receiving File Name (recv(Communication\_Socket, CH, sizeof(CH), 0); I don't know why! ☹ ---
**Author:** ![pludi](https://community.unix.com/user_avatar/community.unix.com/pludi/32/1278_2.png) [@pludi](https://community.unix.com/u/pludi)\ **Post date:** [June 23, 2009, 2:34pm UTC](https://community.unix.com/t/socket-programming-send-file/243137/4 "2009-06-23T14:34:14Z")
OK then, what exactly do you mean by "can't send file!"? Does recv() block, is the file corrupted, won't the program end? ---
**Author:** ![htabesh](https://community.unix.com/letter_avatar/htabesh/32/6_22734026db12803ebb3e059622ac3534.png) [@htabesh](https://community.unix.com/u/htabesh)\ **Post date:** [June 23, 2009, 2:46pm UTC](https://community.unix.com/t/socket-programming-send-file/243137/5 "2009-06-23T14:46:25Z")
Is it possible for you to test and compile that 2 program? Thanks for your kindness. 🙂 ---
**Author:** ![mgessner](https://community.unix.com/letter_avatar/mgessner/32/6_22734026db12803ebb3e059622ac3534.png) [@mgessner](https://community.unix.com/u/mgessner)\ **Post date:** [June 25, 2009, 9:57am UTC](https://community.unix.com/t/socket-programming-send-file/243137/6 "2009-06-25T09:57:36Z")
> [@pludi](#): > > sizeof() is a compile-time instruction I'm nit-picking, but it isn't always the case that sizeof is compile-time. C99 allows sizeof to be runtime for VLA's. ---------- Post updated at 09:57 AM ---------- Previous update was at 09:56 AM ---------- To the OP: it would be a good idea to check the return values from all the socket and i/o functions you're using... you're flying blind, not knowing what is happening.