I'm trying to check if the .save method is execute but I'm getting "Cannot convert from void to boolean" error. How could I check it? Also the img.save() doesn't work in a web applet, any clue why it doesn't work?
PImage img = get (180, 0, 620, 400);
if( img.save("img/111,jpg") )
{
fill(0, 255, 0);
}
else
{
fill(255, 0, 0);
}
Your if statement is assuming true or false will be returned by img.save() function. Therefore you need to check what the img.save() is returning. If that is a method than it cannot return any value back once it has been executed meaning you cannot compare it...
Put the method call in try/catch if you expect that the method could fail...
One thing at a time:
You set fill, but don't draw anything afterwards(at least in the code posted) *
By default some functionalities might not work without signing the applet.
You can't use PImage's save() method to do an upload for you. Here's a quote from the documentation:
It is not possible to use save() while running the program in a web
browser.
You will need to use a serverside script to pass data to which in turn will save the image to the serser. Have a look at Philho's upload sketch. Notice that he is passing data to a php script which handles writing the file on the server.
*although not as important, you can try this in the Processing IDE/locally to see the colour change:
if( img.save("img/111.jpg") )
{
fill(0, 255, 0);
}
else
{
fill(255, 0, 0);
}
rect(0,0,width,height);
Related
I'm trying to receive an invite message and then reply with 100 trying and/or 180 ringing to the same client. I'd like to use only the parser from libosip2.
So when I try to osip_message_to_str so I have a buffer to send back, it always fails with -2.
I tried cloning all the fields I thought it would make sense. But still having the same issue.
If I try to osip_message_to_str on the message I received, it works well.
parser_init();
osip_message_t *request = received_buffer(buffer); // the message is received properly from the buffer
osip_message_t *response;
int i = osip_message_init(&response);
if (i != 0) {
fprintf(stderr, "cannot allocate\n");
return -1;
}
osip_message_set_version(response, strdup("SIP/2.0"));
osip_message_set_status_code(response, 100);
osip_from_clone(request->from, &response->from);
osip_to_clone(request->to, &response->to); /* include the tag! */
osip_call_id_clone(request->call_id, &response->call_id);
osip_contact_t *contact = nullptr;
osip_message_get_contact(response, 0, &contact);
osip_uri_clone(osip_contact_get_url(contact), &response->req_uri);
osip_cseq_clone(request->cseq, &(response->cseq));
char *dest = NULL;
size_t length = 0;
i = osip_message_to_str(response, &dest, &length);
if (i != 0) {
fprintf(stderr, "resp cannot get printable message %d\n", i);
return -1;
}
fprintf(stdout, "message:\n%s\n", dest);
I expect to be able to print a response message.
From libosip2, file osip_port.h, the error return code -2 means bad parameter:
#define OSIP_BADPARAMETER -2
The first line of an answer is something like this: "SIP/2.0 100 Trying".
In your code, you are setting correctly both "SIP/2.0" and "100". However, you forgot the reason phrase. For "100", obviously, the string should be "Trying". Thus, a complete first line of a response should be done with:
osip_message_set_version(response, osip_strdup("SIP/2.0"));
osip_message_set_status_code(response, 100);
//ADD THIS
osip_message_set_reason_phrase (answer, osip_strdup("Trying");
The above will fix the first error, but there looks to be more. You are using "osip_message_get_contact" to retrieve a contact from the response. But there is none. In order to set a contact, you need to search for your IP address, port number, and parameters you want to add. Something like this is advised:
osip_message_set_contact (response, "<sip:192.168.1.10:5678;ob>");
The above API will parse the string as a Contact header and add it to the response.
To make it clear (as you have used it), "response->req_uri" is empty for a response. It means "Request-URI" which is only for request.
If you wish a complete response, you will also need to copy all the "Via" headers:
{
osip_list_iterator_t it;
osip_via_t *via = (osip_via_t *) osip_list_get_first (&request->vias, &it);
while (via != NULL) {
osip_via_t *via2;
i = osip_via_clone (via, &via2);
if (i != 0) {
osip_message_free (response);
return i;
}
osip_list_add (&response->vias, via2, -1);
via = (osip_via_t *) osip_list_get_next (&it);
}
}
NOTE: use osip_strdup instead of strdup for any osip allocation to make your code more portable.
osip_message_to_str should work then!
For more precise code, feel free to have a look at my exosip2 code here. It will certainly help you for the next question you will have!
I capture the image from an IP-Camera and I work with the frames. My programm reads when there is a movement, and then, it makes a photo and save it on the computer.
It works perfectly at first, but when it is running like 2-3 hours, it usually get an error, and I do not find a explanation for this. Because, if it is an error on getting the image or the processing, it should happens since first, shouldn't it?
The error I get is the next:
Exception in thread "main" java.lang.NullPointerException
at com.googlecode.javacv.IPCameraFrameGrabber.grab(IPCameraFrameGrabber.java:105)
at Llamada.main(Llamada.java:34)
I have looked for the error nº105 but I have not found anything.
The program is the next:
public class Llamada {
public static void main(String[] args) throws Exception {
IPCameraFrameGrabber grabber = new IPCameraFrameGrabber("http://192.168.2.102:80/mjpg/video.mjpg");
//OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
grabber.start();
IplImage frame = grabber.grab();
IplImage image = null;
IplImage prevImage = null;
IplImage diff = null;
Date data = new Date();
String output = "";
int i=0, j=0;
CanvasFrame canvasFrame = new CanvasFrame("IP Camera");
canvasFrame.setCanvasSize(frame.width(), frame.height());
CvMemStorage storage = CvMemStorage.create();
while (canvasFrame.isVisible() && (frame = grabber.grab()) != null) {
cvSmooth(frame, frame, CV_GAUSSIAN, 9, 9, 2, 2);
if (image == null) {
image = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
cvCvtColor(frame, image, CV_RGB2GRAY);
} else {
prevImage = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
prevImage = image;
image = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
cvCvtColor(frame, image, CV_RGB2GRAY);
}
if (diff == null) {
diff = IplImage.create(frame.width(), frame.height(), IPL_DEPTH_8U, 1);
}
if (prevImage != null) {
// perform ABS difference
cvAbsDiff(image, prevImage, diff);
// do some threshold for wipe away useless details
cvThreshold(diff, diff, 64, 255, CV_THRESH_BINARY);
canvasFrame.showImage(diff);
// recognize contours
CvSeq contour = new CvSeq(null);
cvFindContours(diff, storage, contour, Loader.sizeof(CvContour.class), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE);
while (contour != null && !contour.isNull()) {
if (contour.elem_size() > 0) {
output = data.toString();
if (data != null)
output = output.substring(0,10);
if(i%300 == 0)
cvSaveImage((j++)+" "+ output +"-capture.jpg", frame);
CvBox2D box = cvMinAreaRect2(contour, storage);
// test intersection
if (box != null) {
CvPoint2D32f center = box.center();
CvSize2D32f size = box.size();
}
i++;
}
contour = contour.h_next();
}
}
}
grabber.stop();
canvasFrame.dispose();
}
}
Thank you for everything!
Have you tried using a debugger and setting a break point? I understand that waiting around for 2-3 hours isn't fun, but maybe it'd help you get a handle on what's going on.
That seems to be in your while loop's second conditional part. Something inside the method grab on the grabber object is throwing a NullPointerException.
Probably the way you've initialized the grabber has led it to do this.
And it would be useful to know which version of the IPCameraFrameGrabber class you're using and what the author of that class really expected. Namely it's initialized to respond to a particular camera's url. In reading the class, it would appear this makes no claim to work with all IP cameras' MJPEG streams.
Let's look at one example comment in there:
foscam url http://host/videostream.cgi?user=username&pwd=password
http://192.168.0.59:60/videostream.cgi?user=admin&pwd=password
android ipcam http://192.168.0.57:8080/videofeed
And compare that to your url:
http://192.168.2.102:80/mjpg/video.mjpg
I gather it is not a foscam videostream.cgi url nor an android ipcam videofeed url, which would appear to be the only tested urls. It reminds me of an Axis camera url. More on that later.
In a recent version of that class (also in the older one actually), there seems to be some hackish attempt at reading only to the end of a subheader that is always delimited by crlfcrlf which could have been done just as well with a buffered input reader reading lines until it gets an empty line. What I do see here that seems likely to cause an npe is:
When your url's http server's response does not contain the content-length header, which is quite possible, the returned readImage() byte[] is null.
Since javax.imageio.ImageIO specifies that it will throw an IllegalArgumentException when it gets a null input, I'm guessing it's the ByteArrayInputStream constructor in the grabBufferedImage method that's throwing this, the IplImage.createFrom(null) in the old version, or the b.length in the newer version that is.
None of the line numbers of these versions line up with the error message you've shown that you're getting, so maybe your version of the library is yet again different, and broken differently. Try using the debugger, edit and patch the source of the IPCameraFrameGrabber to better support your mjpeg over http "device" based on what you find out is really in the input stream of the http response.
Since the url format reminds me of an Axis camera, I tried this with one running firmware v5.50 with the boa server built in:
$ curl -I http://user:pass#10.10.10.10:8080/mjpg/video.mjpg
HTTP/1.0 200 OK
Cache-Control: no-cache
Pragma: no-cache
Expires: Thu, 01 Dec 1994 16:00:00 GMT
Connection: close
Content-Type: multipart/x-mixed-replace; boundary=myboundary
So you can see the content length is missing there. However, you do say you're getting frames initially for hours, then then, so I'm kind of at a loss with that part. I mean it sounds as though EITHER the input stream is getting closed, or the java implementation wrapping the stream, implemented in the http protocol handler, runs out of some kind of total space or open connection timer for some reason. I know this seems vague.
Another thing that seems odd is that from what I read in the two example classes of IPCameraFrameGrabber linked, every call to grab reads the input stream looking for headers first, which doesn't make sense to me right now, and I feel as though I must be misreading that.
I'm trying to generate an MDEntryTime with a value that contains milliseconds. The milliseconds are getting dropped once they get entered into the Message. Upon further inspection, I find this little gem inside Field.h
explicit UtcTimeOnlyField( int field, const UtcTimeOnly& data, bool showMilliseconds = false )
The constructor for MDEntryTime doesn't allow for the coder to set showMilliseconds=true. How do people get around this?
The constructor for MDEntryTime doesn't allow for the coder to set showMilliseconds=true.
In fact, it does. The following should work for you:
msg.set(FIX::MDEntryTime(FIX::UtcTimeOnly(time(NULL), true)));
This one works for me. I did a method that ensure milliseconds are present in the UtcTimeOnly:
FIX::UtcTimeOnly getTimeMillis()
{
timeval tv;
gettimeofday(&tv, NULL);
return FIX::UtcTimeOnly(tv.tv_sec, tv.tv_usec / 1000);
}
And then, I set the field this way:
msg.setField(FIX::UtcTimeOnlyField(FIX::FIELD::MDEntryTime, getTimeMillis(), true));
I have added all lua source files in xcode, then build successfully, but have error when run.
after load the lua file, it comes out the error when use pcall method.
Here is the code:
p_lua_stack_ = luaL_newstate();
luaL_openlibs(p_lua_stack_);
FilePathManager *m = [FilePathManager sharedInstance];
int r = luaL_loadfile(p_lua_stack_, [[m llkFacadeFilePath] UTF8String]);
DLog(#"%#", [m llkFacadeFilePath]);
DPRINT("%d", r);
//DPRINT("%d", lua_pcall(p_lua_stack_, 0, 0, 0));
int cr = lua_pcall(p_lua_stack_, 0, 0, 0);
LuaStateUtil *util = LuaStateUtil::GetSharedInstancePointer();
util->PrintPcallReturnValue(cr); //print return value info
DPRINT("%s", lua_tostring(p_lua_stack_, -1)); //when run to this line, the output is...
The output is:...4-489C-4A40-8582-F734FAAC428D/LLK.app/llk_facade.lua:1: attempt to call global 'module' (a nil value)
Then I am totally confused because "module" is a library method of Lua.
Who can help me, please?
maybe this question read a little hard, i'm not good at English.
If that is Lua 5.2, you need to enable module by defining LUA_COMPAT_MODULE.
I've got this odd problem.
If I make a call on that function through amfphp service browser and give it a valid ID and leave the $num_images field blank amfphp will actually pass a blank string as the argument.
// if i call this function width just an ID
function getWorkers($id, $num_images = 100) {
...
// num_images will be set as ''
}
I can easily override using a check:
function getWorkers($id, $num_images = 100) {
if($num_images=='') $num_images = 100;
...
// num_images will now be really set as 100
}
Anyone experiencing the same with amfphp?
That's odd, I never got that from AMFPHP. If you don't have the latest version try updating your installation of AMFPHP. Also make sure Flash doesn't somehow pass an empty variable as the second variable.
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