📄 snapshot.c
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#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/file.h>#define WIDTH 640#define HEIGHT 480int main(int argc, char *argv) { char fname[1000]; char size[200]; int n = getpid(); sprintf(fname, "/home/httpd/video/image%d.jpg", n); unlink(fname); if (fork() == 0) { sprintf(size, "%dx%d", WIDTH, HEIGHT); execl("/bin/vidcat", "vidcat", "-f", "jpeg", "-s", size, "-o", fname, NULL); exit(1); } wait(NULL); /* Output HTML header */ printf("Content-type: text/html\n"); printf("\n"); printf("<html><head>\n"); printf("<meta http-equiv=\"refresh\" content=\"7; URL=/cgi-bin/snapshot\">\n"); printf("<title>Image Capture</title>\n</head>\n"); printf("<body>\n"); printf("<h1>Current image</h1><p>\n"); printf("<img src=\"/video/image%d.jpg\" width=\"%d\" height=\"%d\">\n", n, WIDTH/2, HEIGHT/2); printf("<h1>Saved image</h1><p>\n"); printf("<img src=\"/video/image.jpg\" width=\"640\" height=\"480\">\n"); printf("</body></html>\n"); fflush(NULL); if (fork() == 0) { /* Wait a little while and delete our temp file */ close(0); close(1); close(2); sleep(5); unlink(fname); }}⌨️ 快捷键说明
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