topic Re: .NET SDK C# Image Export in Integration, Extension & APIs

.NET SDK C# Image Export

bramkn — Sat, 16 Nov 2024 07:13:54 GMT

Hi,

So the people using JS got the Image export available with their API.

Is there anyone that found a way to do this within C#?

Apparently the API's for this are not public, but why??

I have got it to work with opening a browser and navigating through it to export the image and get it from the server. But this is not really reliable to use.

If the API's are not going to be public, is there a way to for example put a bit of JS within the application and handle this image export for the C# bit? If so does it need any install of node.js for example? I have not worked with JS and the Qlik API's.

If someone would be able to provide sample code for this last bit, that would be really awesome.

Re: .NET SDK C# Image Export

kaushiknsolanki — Thu, 22 Nov 2018 09:43:33 GMT

Check below link for more help.

https://www.nuget.org/packages/QlikSense.NetSDK/

https://help.qlik.com/en-US/sense-developer/November2018/APIs/net+sdk/html/7b30b3a1-77da-4bbe-bdc2-1320dfa4f726.htm

Regards,

Kaushik Solanki

Re: .NET SDK C# Image Export

bramkn — Thu, 22 Nov 2018 09:47:30 GMT

I don't want to sound rude.
but did you read my post?

I have my application running I just need more functionallity, of course I have checked the reference...

Re: .NET SDK C# Image Export

kaushiknsolanki — Thu, 22 Nov 2018 09:49:41 GMT

Its ok.

I do understand that you have a working model, but just wanted to make sure that you got access to the documentation.

If you dont find it in document, then I doubt that functionality is available.

Regards,

Kaushik Solanki

Re: .NET SDK C# Image Export

bramkn — Thu, 22 Nov 2018 09:52:55 GMT

It's ok.

But thats exactly what I am saying. My question is Why is such an API (or the functionality) not available for C#/.NET, while it is for JS.
The second question is if there is a way around it for C# that anyone has got working.

Re: .NET SDK C# Image Export

7n9bauijtrugl24 — Mon, 14 Jan 2019 15:08:08 GMT

@b_knuever: Did you ever figure out how to do this?

Re: .NET SDK C# Image Export

bramkn — Wed, 16 Jan 2019 07:56:23 GMT

Yes.
The way to do it, is to do a HTTP Request to the Printing service the same as the Client does to export.
The Engine provides all the information needed to fill the body of the request.
I am using the Certificate to connect to the Engine, this is also possible for this HTTP request for the printing service.
Hope this helps.
If more info is needed I need to get my code and give you some snippits.

Re: .NET SDK C# Image Export

LuQuan182 — Mon, 08 Apr 2019 10:35:48 GMT

Hi,

@b_knuever: can you give us more detail about the printing service and the methods used?

Regards,

Lu Quan

Re: .NET SDK C# Image Export

bramkn — Wed, 10 Apr 2019 06:36:14 GMT

Hi @LuQuan182

To be honest the code I had seemed to stopped working with new apps. Probably because of the new things added like abbreviations. Haven't had the time to pinpoint the issues completely.

When using chrome for example you can analyse the calls the browser is making. When you export an image you will see the export image post to the printing service. The thing is to rebuild that call within your C# code. Most things can be gotten form the engine. You just need to build up the request from scratch. Hope this helps enough to get you going.

Re: .NET SDK C# Image Export

LuQuan182 — Mon, 06 May 2019 16:03:15 GMT

Hi @bramkn ,

Very helpful last time, i hope you can help me again at this time .

Now i have some authentication issue on .NetCore that seems different from .Net version of SDK,

after ntml authentication i'm not able to get the location.SessionCookie (valorized to null), did you ever see the problem or the solution to avoid it?

I opened a dedicated thread on the community with details:

https://community.qlik.com/t5/Qlik-Sense-Integration/Retrieve-SessionCookie-using-AsNtlmUserViaProxy-for-the-printing/m-p/1577044#M10464

Thank you,

Lu Quan

Re: .NET SDK C# Image Export

bramkn — Tue, 07 May 2019 06:04:54 GMT

Hi @LuQuan182

I am sorry I have only used the session cookies within Qlik scripting for the NPrinting API.

Never used it to connect to the Engine or anything like that. Also haven't used .NetCore sofar.

Hope someone will be able to help on the dedicated post. Also the Qlik Branch Slack is very helpful for these kind of questions. There is some great people that that can help with almost everything.

Re: .NET SDK C# Image Export

agigliotti — Mon, 11 Nov 2019 12:04:22 GMT

did you find any solution?

please let me know.

BR
Andrea

Re: .NET SDK C# Image Export

LuQuan182 — Mon, 11 Nov 2019 14:02:32 GMT

Ciao @agigliotti ,

Personally i tried 2 ways:

- Printing service of Qlik, as @bramkn already said, it's possible to rebuild the API call done from the Browser client when you export an graph as image. Personally i found some problem about filters logics few months ago.

- Done an image capture of the webpage retried via single integration API with the .exe found here: https://github.com/qlik-bots/QlikBotNet/tree/master/CaptureHTML.

Lu Quan

Re: .NET SDK C# Image Export

bramkn — Wed, 13 Nov 2019 07:04:19 GMT

Hi @LuQuan182

What issues were u having with filters? I don't have any issues with using the printing service so far.

Re: .NET SDK C# Image Export

LuQuan182 — Wed, 13 Nov 2019 08:56:38 GMT

Hi @bramkn ,

i found that the printing service takes a statics value from the json and it creates a chart,

so in my case i'm not able to use it as a stand alone service.

Re: .NET SDK C# Image Export

bramkn — Wed, 13 Nov 2019 10:40:47 GMT

@LuQuan182

Ah yes thats correct. I am using it for creating reports so for me its perfect. 🙂

Re: .NET SDK C# Image Export

agigliotti — Wed, 13 Nov 2019 14:01:27 GMT

Currently i'm using the CaptureHTML program with the below code:
the url is "http://localhost/single/?appid=001e3853-02dd-46b5-95e2-fc0055d38393&obj=485a3f6f-5d28-48de-9b95-919602c3c039"
/*****/
try
{
using (Process exeProcess = Process.Start(startInfo))
{
exeProcess.WaitForExit(AppTimeout);
if (exeProcess.HasExited)
{
await BotSendPhotoMessage(chatID, Caption, ImageFile);
return true;
}
else
{
botLog.AddBotLine("Error capturing chart image", LogFile.LogType.logError);
exeProcess.Kill();
return false;
}
}
}
catch (Exception e)
{
botLog.AddBotLine(string.Format("Failed sending a chart image: {0}", e), LogFile.LogType.logError);
return false;
}
/*****/

The problem i'm facing is with the png image that is empty , while debugging the code it's well generated.
It seems the image capture is done before the web page is completely rendered...
"AppTimeout" is 6 seconds.
What could be the reason?
Can someone help me? @kaushiknsolanki , @Alexander_Thor , @bortolotti_carl , @bramkn
Many thanks in advance for your time.

Best regards
Andrea

Re: .NET SDK C# Image Export

LuQuan182 — Wed, 13 Nov 2019 13:40:21 GMT

Hi @agigliotti ,

The .exe uses internet explorer as browser, make sure have configurated the credential to it.

Otherwise you can increase the AppTimeout.

Lu Quan

Re: .NET SDK C# Image Export

agigliotti — Wed, 13 Nov 2019 13:53:26 GMT

Hi @LuQuan182

what do you mean with "make sure have configurated the credential to it" ?
also running CapureHTML.exe with the same parameters from cmd it works fine.
I alo tried increasing the AppTimeout with the same result.

Re: .NET SDK C# Image Export

LuQuan182 — Wed, 13 Nov 2019 14:04:05 GMT

@agigliotti

if you open the chart url with internet explorer, you can see the chart?,

if yes i don't know what could be you problem.

Lu Quan