CODEWITHSUNDEEP
c++file-iocgi
user1408818
user1408818

Reputation: 13

c++ cgi file streaming

i've been trying to serve binary files (mp3 files as example) through cgi. The point is that i want to make files accessible only through an special script an not through the webserver itself. Till now i got:

int main() {
    cgiWriteEnvironment("/CHANGE/THIS/PATH/capcgi.dat");
    cgiHeaderContentType("audio/mpeg");

    FILE *fp;
    fp=fopen("D:/something.mp3", "r");
    char buffer[4];

    while (!feof(fp)) {
        fread(buffer, 4, 1, fp);
        printf("%x",buffer);
    }


    return 0;
}

It's putting out something to stdout and the browser is trying to open vlc (so the header should be correct...) but the players can't handle the data :-(

Upvotes: 1

Views: 695

Answers (1)

David Seiler
David Seiler

Reputation: 9705

You're encoding the .mp3 file in hexidecimal, a sequence of ASCII 0s and 4s and Cs and so forth. You want fwrite(), which will preserve the original format of the bytes you're writing. Also: a buffer size of 4 bytes will work, but I'd recommend 4k (4048) or 8k (8192) bytes instead. On a modern machine it doesn't matter, but calls to fread() are (relatively) slow so you want to make as few as possible.

Also: this is a pretty strange thing to want. What problem are you trying to solve, and why can't a normal web server solve it?

Upvotes: 1

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