IP Cameras

The 825gen2 includes the wget and curl command line utility and the curl libraries.

Most IP cameras provide a URL that can be used to obtain a still image such as a jpeg format file. The wget command line utility may be used to obtain the image such as:

wget 10.1.3.25:/cgi-bin/viewer/video.jpg?resolution=640x480 -O /tmp/img.jpg

This could be performed from a system call in an app. A better approach is to use the curl library. Following is an example:

#include "cardinal825.h"
#include <curl/curl.h>


size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
	size_t written = fwrite(ptr, size, nmemb, stream);
	return written;
}

void CaptureImage(int tktNum, const char* code)
{
	char imgfilepath[120];
	CURL *curl;
	FILE *fp;
	CURLcode res;

	DEBUG_MSG("%s tktNum %d code [%s]\n", __FUNCTION__, tktNum, code);

	curl = curl_easy_init();
	if(curl) {
		sprintf_s(imgfilepath, _imgfilefmt, tktNum, code);
		fp = fopen(imgfilepath, "wb");
		curl_easy_setopt(curl, CURLOPT_URL, /*CAMERA_SNAP_URL*/ _cameraSnapURL);
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
		res = curl_easy_perform(curl);
		if(res != CURLE_OK) {
			DEBUG_MSG("curl_easy_perform error %d\n", res);
		}

		curl_easy_cleanup(curl);
		fclose(fp);

	} else {
		DEBUG_MSG("curl_easy_init returned NULL\n");
	}
}