LAMW: Print to network printer
lazarus / 43-Android

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dseligo · 2023-11-26 17:19

How to print directly to a network printer?

I found some example in Java, but I don't know how to translate it to
Free Pascal: https://riggaroo.dev/simple-printing-in-android-to-a-
network-printer/

Code: Java  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
DataOutputStream outToServer;Socket clientSocket;try { 
 createHtmlDocument(htmlString);   FileInputStream fileInputStream =
new
FileInputStream(android.os.Environment.getExternalStorageDirectory()
 + java.io.File.separator+ "test.pdf");   InputStream is
=fileInputStream;   clientSocket = new Socket(ipAddress, portNumber); 
 outToServer = new DataOutputStream(clientSocket.getOutputStream()); 
 byte[] buffer = new byte[3000];   while (is.read(buffer) !=-1){     
outToServer.write(buffer);   }   outToServer.flush();   return
1;}catch (ConnectException connectException){   Log.e(TAG,
connectException.toString(), connectException);   return -1;}catch
(UnknownHostException e1) {   Log.e(TAG, e1.toString(), e1);   return
0;} catch (IOException e1) {   Log.e(TAG, e1.toString(), e1);   return
0;}finally {   outToServer.close(); }

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loaded · 2023-11-27 06:01

First of all, it is worth noting that LAMW uses java in the
background.
I recommend you to examine LAMW examples on the subject. Code: Pascal
 [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
..\lazandroidmodulewizard-master\demos\GUI\Probably the
AppIntentDemoPrinting1 example can be of use to you.

I take the following approach: In my application, I first convert the
output to pdf and then leave the initiative to the user. User ;
- If it wants, it can send it directly to the wired/wireless printer
itself.
- Can save as pdf if desired then send to printer or bluetooth or
whatsapp at a later time.
However, I do most of the above operations directly in Java in Android
Studio.

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dseligo · 2023-11-27 08:22

Quote from: loaded on November 27, 2023, 07:01:10 amProbably the
AppIntentDemoPrinting1 example can be of use to you.

I saw that example, but it is not direct printing, it calls 3rd party
applications. Furthermore, first application wants upgrade to premium
to use network printer, and second application is made for older
version of Android.
I want to print without further user interaction (I have IP address of
the printer stored in the settings).

Also, printing on Windows shared printers would also be great.

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loaded · 2023-11-28 06:15

Quote from: dseligo on November 27, 2023, 09:22:08 amI saw that
example, but it is not direct printing, it calls 3rd party
applications. Furthermore, first application wants upgrade to premium
to use network printer, and second application is made for older
version of Android.
I want to print without further user interaction (I have IP address of
the printer stored in the settings).

Also, printing on Windows shared printers would also be great.

I understand you're right.
I'm at work right now and unfortunately I don't have the opportunity
to run these examples, so I want to tell you about what I do in such
situations.
When I encounter such problems, I use Android Studio + LAMW to find
solutions more easily.
When it comes to Android-related operations, I first make my
experiments on Android Studio. After the project runs smoothly, I add
java codes to LAMW as needed.

First of all, I believe that Master jmpessoa, one of the authors of
LAMW, can easily find the solution to this problem.

Or if you examine the files below, you will see the working logic of
LAMW more clearly. You can then modify it according to your needs.
Of course, all of these processes will require some trial and error.

Regarding the subject, Java Files used by LAMW. The java files here
are transferred to the relevant projects. (You can make changes in
these files.);
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
...\lazandroidmodulewizard-master\android_wizard\smartdesigner\java
Pas files that provide links to Java files. (You can make changes in
these files.);
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
...\lazandroidmodulewizard-master\android_bridges
The java files used by the printing example mentioned in the previous
message are;
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
...\lazandroidmodulewizard-master\demos\GUI\AppIntentDemoPrinting1\src
\org\lamw\appintentdemoprinting1
Note: This approach may not be very professional. I welcome experts to
offer their criticisms.