CODEWITHSUNDEEP
cfiledownloadjpeg
user2158382
user2158382

Reputation: 4510

C: How to read a jpg from a file and save it?

I am having some trouble reading a jpg file and saving it. I want to implement a file sharing system between a client and server and I am unable to even read a jpg and save it on the same process. Here is what I have so far

int main(int argc, const char * argv[])
{
    char *buffer;
    FILE *picture;
    FILE *newPicture;
    struct stat st;
    long fileSize = 0;


    picture = fopen("PATH/root/game-of-thrones-poster.jpg", "rb");
    fstat(picture, &st);
    fileSize = st.st_size;
    if(fileSize > 0) {
        buffer = malloc(fileSize);

        if(read(picture, buffer, fileSize) < 0) {
            printf("Error reading file");
        }
        fclose(picture);

        newPicture = fopen("PATH/root/new.jpg", "wb");
        write(newPicture, buffer, fileSize);
    }
    free(buffer);
}

When it tries to read the file, it tells me that fileSize is 0.

Upvotes: 0

Views: 5225

Answers (1)

David Ranieri
David Ranieri

Reputation: 41017

fstat() is identical to stat(), except that the file to be stat-ed is specified by the file descriptor fd.

You are passing FILE *, fstat expects an int

Upvotes: 3

Related Questions