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How to convert a png file to .GRF file used for zebra printer

I use Zebraprinter for printing the labels. My printer is 203dpi. For last couple of days i was searching in internet and i found there are Zebraprint utilities.. to convert to DFR format.. which sucks.. they are not fully explaining how to do this.. They just says convert to ~DG format. any print it, which is not happening!!
Rather I would like to convert a png file to a .GRF file and send to the printer for printing.. IS there any deadly available free software in internet which does my needs,
Also, i tired to develop a software which does the job for printing the letters.. which is wiring fine. i don't know how to print pictures using this printer.
I need to convert this image https://imageshack.com/i/pb0BArbep to .GRF format. How can i do all this under a single button press.. Any helps..
Thanks a lot.
Code snippet:-
private void button2_Click(object sender, EventArgs e)
{
string s = Print();
PrintFactory.sendTextToLPT1(s);
}
private string Print()
{
string s = "";
s += "^XA^LH"+ text.textbox + ".GRF,1,1^FS";
s += "^FO250,294^FD^FS";
s += "^XZ";
return s;
}

It's been a month since this was asked, so I don't know if an answer is still needed or not, but I'll have a go at it. I've actually been doing a lot of research on ZPL lately, (one of the reasons I came across this question), and I had to do something similar. With a 203 dpi printer as well, actually. I'm not sure how to convert a PNG to GRF, but I was able to print out a graphic using just a PNG:
^XA
^MNY
^LL203
~DYE:{name},P,P,{file size},,{data}
^XZ
The ^MN has to do with Media Tracking, and you may have to change it a bit to suit your needs, depending on the label. Same thing with ^LL, which specifies the label length. For an 8 dots/mm (203 dpi), the value you use as an argument is calculated by 203.2 * length of label in inches. After that, there's a few values to plug into ~DY (Download graphics, page 112 on the manual), the first of which is the name you want to use to reference the file. I didn't add a file extension, as the printer seemed to do that for me, since I specified it was a PNG in the arguments. The second is the size, in bytes, of the PNG file. And lastly, the actual data from the file in the form of ASCII hex. Now with the file being saved on the printer, I was then able to print the graphic in a script using:
^IME:{name}.PNG
^FS
Note: After uploading the file to the printer, I was able to confirm it did save as a PNG file by connecting to the printer VIA IP in a browser and going to "Directory Listing". I'm not sure if all those printers have this feature, but the one I used did. If it does, you can use this to confirm that the file properly uploaded. (It should be in Onboard Flash)
Hope this helps!
The manual I used is here.
I also came across numerous other StackOverflow questions that helped out a bit, and a few threads on other forums. One question that was also in C# that helped me quite a bit can be found here.

EMGU QueryFrame returns "streaky" Image over RTSP

I have a HD network camera that I am trying to grab frames over rtsp and using the following code:
//in Form_Load
Application.Idle += getNextFrame;
And the Event Handler:
private void getNextFrame(object sender, EventArgs ags)
{
//where _imgCount is the total image Grabs
lbl_Count.Text = _imgCount++.ToString();
// and ibLive is a Emgu ImageBox
ibLive.Image = capAxis.QueryFrame().Resize(640, 480, INTER.CV_INTER_AREA);
}
When I start the program, it'll grab 20-40 frames before the "streakiness" appears at the bottom of the screen. It's always on the bottom of the image, but some times it takes up half the screen.
The stream resolution is 1920x1080 and it's using mjpeg. I tried switching to h.264 but had the same results.
I am using Emgu version x86-2.4.0.1717
Any Ideas?
Thanks.

I know this is an old question but I ran into the same problem recently.
I would recommend using another streaming library. Eg.
http://net7mma.codeplex.com/
http://www.fluorinefx.com/
If you really need to stream using EMGU then create a stream profile with a lower resolution or higher compression. I set compression to 30 and used the same resolution then provided the stream profile name in the rtsp url. (Assuming you're using an Axis camera like me capAxis)
Capture cap = new Capture(#"rtsp://10.0.0.1/axis-media/media.amp?videocodec=h264&streamprofile=rtspstream");

I have the same problem like that and I have solved it by myself. I used iSpy to know url of my ONVIF Ip Camera. My IP Camera's url is rtsp://192.168.1.xxx:554//user=admin_password=tlJwpbo6_channel=1_stream=0.sdp?real_stream
For stream = 0, my IP Cam is running in HD resolution (1280 x 720) and that resolution makes a streaky result of my image. So there were two options of URL that iSpy gave, and the other one is just different in stream. I changed stream = 1 for low resolution (352 x 288) and the image result is good ! There's no streaky in my image. Something that I learned from this problem was using RTSP you must use it in low resolution. High resolution will make the image result not good. Hope it can help your problem.
Regards,
Alfonsus Dhani

At the end of Capture string add this "?tcp"
Capture cap = new Capture(#"rtsp://10.0.0.1/axis-media/media.amp?videocodec=h264&streamprofile=rtspstream?tcp");
EDIT
This is my code, and yes, it works, I'am using an IP cam DAHUA.
Capture cap = Capture(#"rtsp://admin:12345#10.0.0.01:554/cam/realmonitor?channel=1&subtype=01?tcp");

A late reply but may help someone facing similar challenged.
Emgu's capabilities to deal with RTSP streams are limited and not stable. I was facing similar issues as discussion in this question,
Unable to use EMGU CV to grab images from RTSP stream continuously
The solution was to use RTSPClientSharp which works like a charm.
( https://github.com/BogdanovKirill/RtspClientSharp )

c# how to write a jpg image from request.binaryread

I have a flash app which sends raw data for a jpg image to a particular url Send.aspx . In Send.aspx I am using request.binaryread() to get the total request length and then read in the data to a byte array.
Then I am writing the data as jpg file to the server. The code is given below:
FileStream f = File.Create(Server.MapPath("~") + "/plugins/handwrite/uploads/" + filename);
byte[] data = Request.BinaryRead(Request.TotalBytes);
f.Write(data, 0, data.Length);
f.Close();
The file is getting created but there is no image in it. It always shows up as empty in any graphic viewer. What part am I missing. Am I supposed to use jpg encoding first before writing it to file? Thanks in advance

Well, you should use a using statement for your file stream, but other than that it looks okay to me.
A few suggestions for how to proceed...
Is it possible that the client isn't providing the data properly? Perhaps it's providing it as base64-encoded data?
Have you already read some data from the request body? (That could mess things up.)
I suggest you look closely at what you end up saving vs the original file:
Are they the same length? If not, which is longer?
If they're the same length, do their MD5 sums match?
If you look at both within a binary file editor, do they match at all? Any obvious differences?

Reading PSD file format

I wonder if this is even possible. I have an application that adds a context menu when you right click a file. It all works fine but here is what I'd like to do:
If the file is a PSD then I want the program to extract the image. Is this possible to do without having Photoshop installed?
Basically I want the user to right click and click "image" which would save a .jpg of the file for them.
edit: will be using c#
Thanks

The ImageMagick libraries (which provide bindings for C#) also support the PSD format. They might be easier to get started with than getting into the Paint.NET code and also come with a quite free (BSD-like) license.
A simple sample (found at http://midimick.com/magicknet/magickDoc.html) using MagickNet would look like this:
using System;
static void Main(string[] args)
{
MagickNet.Magick.Init();
MagicNet.Image img = new MagicNet.Image("file.psd");
img.Resize(System.Drawing.Size(100,100));
img.Write("newFile.png");
MagickNet.Magick.Term();
}
Note: MagickNet has moved to http://www.codeproject.com/KB/dotnet/ImageMagick_in_VBNET.aspx

Well, there's a PSD plugin for Paint.NET which I think is Open-Source which you might want to take a look at for starters:
http://frankblumenberg.de/doku/doku.php?id=paintnet:psdplugin#download

This guy do it easier:
http://www.codeproject.com/KB/graphics/simplepsd.aspx
With a C# library and a sample project.
I've tried with PS2 files and works ok.

I have written a PSD parser which extracts raster format layers from all versions of PSD and PSB. http://www.telegraphics.com.au/svn/psdparse/trunk

You can use GroupDocs.Viewer for .NET API to render your PSD files as images (JPG, PNG, BMP) in your application using a few lines of code.
C#
ViewerConfig config = new ViewerConfig();
config.StoragePath = "D:\\storage\\";
// Create handler
ViewerImageHandler imageHandler = new ViewerImageHandler(config);
// Guid implies that unique document name
string guid = "sample.psd";
// Get document pages as images
List<PageImage> pages = imageHandler.GetPages(guid);
foreach (PageImage page in pages)
{
// Access each image using page.Stream
}
For more details and sample code, please visit here.
Disclosure: I work as a Developer Evangelist at GroupDocs.

For people who are reading this now: the link from accepted answer doesn't seem to work anymore (at least for me). Would add a comment there, but not allowed to comment yet - hence I'm adding a new answer.
The working link where you can find the psdplugin code for Paint.Net: https://github.com/PsdPlugin/PsdPlugin

Here is my own psd parser and exporter:
http://papirosnik.info/psdsplit/.
It allows to correctly parse psd with rgb color 8, 16- and 32-bit for channel, process user masks, export selected layers into jpeg, png, jng, bmp, tiff; create xml layout of exported layers and groups and also create a texture atlas and animations set from given layers.
It's entirely written in C#. If you want its sources inform me via support link on About dialog in the application.

ImageMagick.NET - http://imagemagick.codeplex.com/ - is the later version of the link 0xA3 gave, with some slightly different syntax. (Note, this is untested):
using ImageMagickNET;
public void Test() {
MagickNet.InitializeMagick();
ImageMagickNET.Image img = new ImageMagickNET.Image("file.psd");
img.Resize(new Geometry(100, 100, 0, 0, false, false);
img.Write("newFile.png");
}

I got extraction from psd working. see my answer here
How to extract layers from a Photoshop file? C#
may help someone else.

FastStone does this pretty efficiently.
They do not have their libraries availaible, but I guess you can contact them and see if they can help.
Check out their website: http://www.faststone.org/download.htm

I've had great success with Aspose's Imaging component which can load and save PSD files without Photoshop: https://products.aspose.com/imaging/net

How do I get a Video Thumbnail in .Net?

I'm looking to implement a function that retrieves a single frame from an input video, so I can use it as a thumbnail.
Something along these lines should work:
// filename examples: "test.avi", "test.dvr-ms"
// position is from 0 to 100 percent (0.0 to 1.0)
// returns a bitmap
byte[] GetVideoThumbnail(string filename, float position)
{
}
Does anyone know how to do this in .Net 3.0?
The correct solution will be the "best" implementation of this function.
Bonus points for avoiding selection of blank frames.

I ended up rolling my own stand alone class (with the single method I described), the source can be viewed here. Media browser is GPL but I am happy for the code I wrote for that file to be Public Domain. Keep in mind it uses interop from the directshow.net project so you will have to clear that portion of the code with them.
This class will not work for DVR-MS files, you need to inject a direct show filter for those.

This project will do the trick for AVIs: http://www.codeproject.com/KB/audio-video/avifilewrapper.aspx
Anything other formats, you might look into directshow. There are a few projects that might help:
http://sourceforge.net/projects/directshownet/
http://code.google.com/p/slimdx/

1- Get latest version of ffmpeg.exe from : http://ffmpeg.arrozcru.org/builds/
2- Extract the file and copy ffmpeg.exe to your website
3- Use this Code:
Process ffmpeg;
string video;
string thumb;
video = Server.MapPath("first.avi");
thumb = Server.MapPath("frame.jpg");
ffmpeg = new Process();
ffmpeg.StartInfo.Arguments = " -i "+video+" -ss 00:00:07 -vframes 1 -f image2 -vcodec mjpeg "+thumb;
ffmpeg.StartInfo.FileName = Server.MapPath("ffmpeg.exe");
ffmpeg.Start();

There are some libraries at www.mitov.com that may help. It's a generic wrapper for Directshow functionality, and I think one of the demos shows how to take a frame from a video file.

This is also worth to see:
http://www.codeproject.com/Articles/13237/Extract-Frames-from-Video-Files