Thread: File i/o filename its extension

Hi,

Is there way to save the whole filename and its extension. Right i now i have a client/server application where client sends a file(for example test.jpg) server save the data of that file with specified filename "copy-client". It dose not saves the filename and its extension.

How do i save the filename and its extension?

Code:

FILE *fp = fopen("copy-client", "w" );
      fwrite(buffer, sizeof(buffer), current, fp);

I know this works, but is not the solution. Fore example if i send next time a "test.txt" file, server must save filename and the extension of the data as it is, in this case as "test.txt" . I dont need to change by hand everytime.

I tried your way by putting it in a buffer.

Code:

 // create and init a char buffer
    char *buffer = malloc(BUFFSIZE);
    buffer[0] = '\0';
    
    
    int stop_received = 0;
    int nr_bytes_recv = 0;
    
    while (! stop_received) {
        // receive data in buffer
        nr_bytes_recv = recv(s, buffer, BUFFSIZE, 0);
        
        if (nr_bytes_recv > BUFFSIZE) {
            perror("Buffer too small");
            exit(EXIT_FAILURE);
        }        
        buffer[nr_bytes_recv]= '\0'; // close string
        printf("Server received : %s", buffer);
        
if(strncmp(buffer, "upload", 6) == 0){
            // echo message
            rv = send(s, buffer, nr_bytes_recv,0);
            if (rv < 0) {
                perror("Error sending");
                exit(EXIT_FAILURE);
            }
            do {
            // receive data in buffer
                nr_bytes_recv = recv(s, buffer, (BUFFSIZE-current), 0);
                if(nr_bytes_recv > 0)
                    current += nr_bytes_recv;
            } while (nr_bytes_recv > 0);

            FILE *fp = fopen(buffer, "w" );
            fwrite(buffer, sizeof(buffer), current, fp);
            fclose(fp);
            close(s);
            stop_received = 1;

The results: it makes a file "upload" with the name of string commando which clients sends. As you can see in the code i use prints function to print out the buffer, this is the output of the buffer

Server received : upload
test.txt

I think the problem is the client sends 3 items in a buffer, the string "upload", filedata and filename. The fopen function takes the first item from the buffer instead of filename.

Originally Posted by Alix

I know this works, but is not the solution. Fore example if i send next time a "test.txt" file, server must save filename and the extension of the data as it is, in this case as "test.txt" . I dont need to change by hand everytime.

Seriously?

Code:

char filename[256];

// put client's filename in filename[]


fp = fopen(filename,"w");

Seems pretty obvious...

Originally Posted by quzah

If you know the format of the data you are receiving, just pick it apart as you get it. If I give you a string, and ask you to take the second word from it, how would you do it?

"take second word"

Quzah.

Code:

char *string;

string= (char *) malloc (25);
scanf("%5s ", string);
printf(string)

like that?


But then how do i know wich string is the name of the file that is stored in the buffer?

In sentence:
"take second word"

1) Read the first string,
2) Stop at the empty space,
3) Read the second string
4) Stop at the empty space
5) Select the string the last string

I have almost working , but only the problem is i specifie the wrong string. What it dose it takes the first string of the content of the file as the name of the file and stores it. Instead of using scanf i decided to use sscanf . like i sayt in my buffer there are 3 information are stored

First: string "upload"
Second: the name of the file
Third: the content of the data

This is my code:

Code:

char string1[10];
sscanf(buffer,"%s %s %s",string1);
 printf("%s ->", string1);
FILE *fp = fopen(string1, "w" );

i tested with simple .txt with one word inside the file "serverrrr". i just test with array of [10]. Results with this case it makes a file, only it names the file by taking the contents of the file en closing with extension .txt .

serverrrr.txt

Same question, how do i select the correct string from the buffer? how do i specify that?

Ok never mind, i got it working. sscanf was the solution and the problem of the previus post is also solved. The solution was dat the call of sscanf was in wrong place.

Thanks