B4A Library HtmlToPdf

Hello everybody,

I've created this library that converts an html file (or string) to a pdf file programmatically.

A couple of important notes: it only works on devices with SDK versions >= 21 and it cannot read files from the asset folder (you can either copy the file to the internal folder and use it from there or read the content with File.ReadString and use the result)

You can find an example attached to this thread.

  • PalmoHtmlToPdf
    • Events:
      • Finished (Success As Boolean)
    • Functions:
      • ConvertFromFile(DirectoryInput as String,FilenameInput as String,DirectoryOutput as String,FilenameOutput as String)
      • ConvertFromString(htmlData as String, DirectoryOutput as String, FilenameOutput as String)
      • Initialize (EventName As String)
 

Attachments

Click to expand...
I know this is an old thread but the error that I get relates to this library (or my ignorance). I have taken your script from your example.html in the /Files folder and created a string lateral with it. Then used your library method to pass the string literal to your library to create the PDF. The sub looks as follows and creates the PDF successfully that can be opened with and of the PDF viewers that I have on my device:

[CODE lang="b4x" title="Creates an openable PDF"]Sub Print
'Works only on devices with SDK >= 21
Dim rr As RuntimePermissions
rr.CheckAndRequest(rr.PERMISSION_WRITE_EXTERNAL_STORAGE)
Wait For Activity_PermissionResult (Permission As String, Result As Boolean)

Activity.LoadLayout("0")
phtmltopdf.Initialize("phtmltopdf")
'You can't use a file from the assets folder
' File.Copy(File.DirAssets,"example.html",File.DirInternal,"example.html")
'You can create the pdf directly from an html file

Dim ssl As String = $"
<html>
<!-- Text between angle brackets is an HTML tag and is not displayed.
Most tags, such as the HTML and /HTML tags that surround the contents of
a page, come in pairs; some tags, like HR, for a horizontal rule, stand
alone. Comments, such as the text you're reading, are not displayed when
the Web page is shown. The information between the HEAD and /HEAD tags is
not displayed. The information between the BODY and /BODY tags is displayed.-->
<head>
<title>Enter a title, displayed at the top of the window.</title>
</head>
<!-- The information between the BODY and /BODY tags is displayed.-->
<body>
<h1>Enter the main heading, usually the same as the title.</h1>
<p>Be <b>bold</b> in stating your key points. Put them in a list: </p>
<ul>
<li>The first item in your list</li>
<li>The second item; <i>italicize</i> key words</li>
</ul>
<p>Improve your image by including an image. </p>
<p><img src="https://alternative.me/icons/basic4android.png" alt="A Great HTML Resource"></p>
<p>Add a link to your favorite <a href="https://www.dummies.com/">Web site</a>.
Break up your page with a horizontal rule or two. </p>
<hr>

</body>
</html>"$


phtmltopdf.ConvertFromString(ssl,File.DirRootExternal,"example.pdf")

End Sub[/CODE]

When I remove the last 4 lines of script the PDF created will not open:
B4X: 
Sub Print
    'Works only on devices with SDK >= 21
    Dim rr As RuntimePermissions
    rr.CheckAndRequest(rr.PERMISSION_WRITE_EXTERNAL_STORAGE)
    Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
  
    Activity.LoadLayout("0")
    phtmltopdf.Initialize("phtmltopdf")
    'You can't use a file from the assets folder
'    File.Copy(File.DirAssets,"example.html",File.DirInternal,"example.html")
    'You can create the pdf directly from an html file
  
    Dim ssl As String = $"
<html>
<!-- Text between angle brackets is an HTML tag and is not displayed.
Most tags, such as the HTML and /HTML tags that surround the contents of
a page, come in pairs; some tags, like HR, for a horizontal rule, stand
alone. Comments, such as the text you're reading, are not displayed when
the Web page is shown. The information between the HEAD and /HEAD tags is
not displayed. The information between the BODY and /BODY tags is displayed.-->
<head>
<title>Enter a title, displayed at the top of the window.</title>
</head>
<!-- The information between the BODY and /BODY tags is displayed.-->
<body>
<h1>Enter the main heading, usually the same as the title.</h1>
<p>Be <b>bold</b> in stating your key points. Put them in a list: </p>
<ul>
<li>The first item in your list</li>
<li>The second item; <i>italicize</i> key words</li>
</ul>

<hr>

</body>
</html>"$

  
    phtmltopdf.ConvertFromString(ssl,File.DirRootExternal,"example.pdf")
  
End Sub

Why wont the PDF be openable?
 

Attachments

When I delete the PDF that was created (in DirRootExternal) and run the amended HTML script then it seems to be working fine. For some reason Android does not seem to like the PDF to be overwritten if it already exists. Anyone that can please shed some light on this observation?
 
Here is an update for the library that will allow one to create the PDF in either Portrait or Landscape modes. Jar and XML attached

B4X: 
    phtmltopdf.Initialize("phtmltopdf")
    phtmltopdf.Orientation = phtmltopdf.LANDSCAPE

PalmoHtmlToPdf

Author: Palmosoft, modified by Johan Schoeman
Version: 1.1
  • PalmoHtmlToPdf
    • Fields:
      • LANDSCAPE As Int
      • PORTRAIT As Int
    • Functions:
      • ConvertFromFile (paramString1 As String, paramString2 As String, DirectoryOutput As String, FilenameOutput As String)
      • ConvertFromString (paramString1 As String, DirectoryOutput As String, FilenameOutput As String)
      • Initialize (paramString As String)
    • Properties:
      • Orientation As Int [write only]
 

Attachments

Here is another update. It should show as V1.2 in the B4A IDE. With my primitive knowledge of HTML it builds beautiful PDF's including tables.

Have done away with the "Orientation" in the wrapper and added a Builder to the Wrapper. The Builder can for now do the following:
1. setMediaSize - options for now are:
[CODE lang="b4x" title="MediaSize Options"] MediaSize_ISO_A4
MediaSize_ISO_A4_asLandscape
MediaSize_ISO_A0
MediaSize_ISO_A1
MediaSize_ISO_A10
MediaSize_ISO_A2
MediaSize_ISO_A3
MediaSize_ISO_A3_asLandscape[/CODE]

I am attaching the Java code in case you want to edit it and add additional MediaSizes to the Builder(other than the 8 listed above)

2. setResolution
3. setMargins
4. setColorMode
5. setDuplexMode
[CODE lang="b4x" title="Duplex Mode"] DUPLEX_MODE_LONG_EDGE
DUPLEX_MODE_NONE
DUPLEX_MODE_SHORT_EDGE[/CODE]

JAR and XML also attached.

[CODE lang="b4x" title="Sample Code"] phtmltopdf.Initialize("phtmltopdf")
phtmltopdfBulder.Initialize
phtmltopdf.PrintAttributes = phtmltopdfBulder.setMediaSize(phtmltopdfBulder.MediaSize_ISO_A4) _
.setResolution(600, 600) _
.setMargins(10, 10, 10, 10) _
.build[/CODE]

PalmoHtmlToPdf

Author: Palmosoft, modified by Johan Schoeman
Version: 1.2
  • PalmoHtmlToPdf
    • Events:
      • finished (value As Boolean)
    • Functions:
      • ConvertFromFile (paramString1 As String, paramString2 As String, DirectoryOutput As String, FilenameOutput As String)
      • ConvertFromString (paramString1 As String, DirectoryOutput As String, FilenameOutput As String)
      • Initialize (paramString As String)
    • Properties:
      • PrintAttributes As android.print.PrintAttributes [write only]
        Build the Builder and then pass the Builder to this method. Eg:
        Example:
        phtmltopdf.PrintAttributes = phtmltopdfBulder.setMediaSize(phtmltopdfBulder.MediaSize_ISO_A4).setResolution(600, 600).setMargins(10, 10, 10, 10).build
  • printAttributeBuilder
    • Fields:
      • DUPLEX_MODE_LONG_EDGE As Int
      • DUPLEX_MODE_NONE As Int
      • DUPLEX_MODE_SHORT_EDGE As Int
      • MediaSize_ISO_A0 As Int
      • MediaSize_ISO_A1 As Int
      • MediaSize_ISO_A10 As Int
      • MediaSize_ISO_A2 As Int
      • MediaSize_ISO_A3 As Int
      • MediaSize_ISO_A3_asLandscape As Int
      • MediaSize_ISO_A4 As Int
      • MediaSize_ISO_A4_asLandscape As Int
    • Functions:
      • build As android.print.PrintAttributes
        Create the Builder after all other builder methods were set.
      • Initialize
        Initialize the builder
      • IsInitialized As Boolean
      • setColorMode (col As Int) As printAttributeBuilder
      • setDuplexMode (mode As Int) As printAttributeBuilder
        A valid duplex mode or zero.
        Value is either 0 or a combination of PrintAttributes.DUPLEX_MODE_NONE, PrintAttributes.DUPLEX_MODE_LONG_EDGE, and PrintAttributes.DUPLEX_MODE_SHORT_EDGE
      • setMargins (L As Int, T As Int, W As Int, H As Int) As printAttributeBuilder
        Specifies content margins in Mills
      • setMediaSize (mediasize As Int) As printAttributeBuilder
        Specifies a supported media size.
        Media size is the dimension of the media on which the content is printed.
        For example, the NA_LETTER media size designates a page with size 8.5" x 11".
      • setResolution (x As Int, y As Int) As printAttributeBuilder
        Specifies a supported resolution in DPI (dots per inch)
 

Attachments

Last edited:
Johan Schoeman said:
Here is another update. It should show as V1.2 in the B4A IDE. With my primitive knowledge of HTML it builds beautiful PDF's including tables.

Have done away with the "Orientation" in the wrapper and added a Builder to the Wrapper. The Builder can for now do the following:
1. setMediaSize - options for now are:
[CODE lang="b4x" title="MediaSize Options"] MediaSize_ISO_A4
MediaSize_ISO_A4_asLandscape
MediaSize_ISO_A0
MediaSize_ISO_A1
MediaSize_ISO_A10
MediaSize_ISO_A2
MediaSize_ISO_A3
MediaSize_ISO_A3_asLandscape[/CODE]

I am attaching the Java code in case you want to edit it and add additional MediaSizes to the Builder(other than the 8 listed above)

2. setResolution
3. setMargins
4. setColorMode
5. setDuplexMode
[CODE lang="b4x" title="Duplex Mode"] DUPLEX_MODE_LONG_EDGE
DUPLEX_MODE_NONE
DUPLEX_MODE_SHORT_EDGE[/CODE]

JAR and XML also attached.

[CODE lang="b4x" title="Sample Code"] phtmltopdf.Initialize("phtmltopdf")
phtmltopdfBulder.Initialize
phtmltopdf.PrintAttributes = phtmltopdfBulder.setMediaSize(phtmltopdfBulder.MediaSize_ISO_A4) _
.setResolution(600, 600) _
.setMargins(10, 10, 10, 10) _
.build[/CODE]

PalmoHtmlToPdf

Author: Palmosoft, modified by Johan Schoeman
Version: 1.2
  • PalmoHtmlToPdf
    • Events:
      • finished (value As Boolean)
    • Functions:
      • ConvertFromFile (paramString1 As String, paramString2 As String, DirectoryOutput As String, FilenameOutput As String)
      • ConvertFromString (paramString1 As String, DirectoryOutput As String, FilenameOutput As String)
      • Initialize (paramString As String)
    • Properties:
      • PrintAttributes As android.print.PrintAttributes [write only]
        Build the Builder and then pass the Builder to this method. Eg:
        Example:
        phtmltopdf.PrintAttributes = phtmltopdfBulder.setMediaSize(phtmltopdfBulder.MediaSize_ISO_A4).setResolution(600, 600).setMargins(10, 10, 10, 10).build
  • printAttributeBuilder
    • Fields:
      • DUPLEX_MODE_LONG_EDGE As Int
      • DUPLEX_MODE_NONE As Int
      • DUPLEX_MODE_SHORT_EDGE As Int
      • MediaSize_ISO_A0 As Int
      • MediaSize_ISO_A1 As Int
      • MediaSize_ISO_A10 As Int
      • MediaSize_ISO_A2 As Int
      • MediaSize_ISO_A3 As Int
      • MediaSize_ISO_A3_asLandscape As Int
      • MediaSize_ISO_A4 As Int
      • MediaSize_ISO_A4_asLandscape As Int
    • Functions:
      • build As android.print.PrintAttributes
        Create the Builder after all other builder methods were set.
      • Initialize
        Initialize the builder
      • IsInitialized As Boolean
      • setColorMode (col As Int) As printAttributeBuilder
      • setDuplexMode (mode As Int) As printAttributeBuilder
        A valid duplex mode or zero.
        Value is either 0 or a combination of PrintAttributes.DUPLEX_MODE_NONE, PrintAttributes.DUPLEX_MODE_LONG_EDGE, and PrintAttributes.DUPLEX_MODE_SHORT_EDGE
      • setMargins (L As Int, T As Int, W As Int, H As Int) As printAttributeBuilder
        Specifies content margins in Mills
      • setMediaSize (mediasize As Int) As printAttributeBuilder
        Specifies a supported media size.
        Media size is the dimension of the media on which the content is printed.
        For example, the NA_LETTER media size designates a page with size 8.5" x 11".
      • setResolution (x As Int, y As Int) As printAttributeBuilder
        Specifies a supported resolution in DPI (dots per inch)
Click to expand...
Thank you for your effort....

I try version 1.2 with original example, but file created with zero size.

Can you check it ?

thank you
 
S
fwizardy said:
Thank you for your effort....

I try version 1.2 with original example, but file created with zero size.

Can you check it ?

thank you
Click to expand...
See post #4 above. Delete the file if it already exists and run once and see if PDF is created successfully. If so, then call the method with a new PDF file name to be created and see if the 2nd file then also created successfully.
 
Johan Schoeman said:
S

See post #4 above. Delete the file if it already exists and run once and see if PDF is created successfully. If so, then call the method with a new PDF file name to be created and see if the 2nd file then also created successfully.
Click to expand...
I try what you suggest but the result is still the same

With same code, if you try with version 1.1
the file is created as expected, NOT ZERO size

So, i think version 1.2 have bugs

B4X: 
    'Works only on devices with SDK >= 21
    Dim rr As RuntimePermissions
    rr.CheckAndRequest(rr.PERMISSION_WRITE_EXTERNAL_STORAGE)
    Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
    
    Activity.LoadLayout("0")
    phtmltopdf.Initialize("phtmltopdf")
    Dim ssl As String = $"
<html>
<!-- Text between angle brackets is an HTML tag and is not displayed.
Most tags, such as the HTML and /HTML tags that surround the contents of
a page, come in pairs; some tags, like HR, for a horizontal rule, stand
alone. Comments, such as the text you're reading, are not displayed when
the Web page is shown. The information between the HEAD and /HEAD tags is
not displayed. The information between the BODY and /BODY tags is displayed.-->
<head>
<title>Enter a title, displayed at the top of the window.</title>
</head>
<!-- The information between the BODY and /BODY tags is displayed.-->
<body>
<h1>Enter the main heading, usually the same as the title.</h1>
<p>Be <b>bold</b> in stating your key points. Put them in a list: </p>
<ul>
<li>The first item in your list</li>
<li>The second item; <i>italicize</i> key words</li>
</ul>

<hr>

</body>
</html>"$

 
    phtmltopdf.ConvertFromString(ssl,File.DirRootExternal,"example.pdf")
Regards,
 
DonManfred said:
If you see this you immediatly know the code is broken.
Click to expand...
It depends on how you want to use it. It is working perfectly on my android 15 device (Samsung) - I use it for own purposes only and A15 allows me to do this with the code/class module by @agraham. Not broken - just not what android allows at this time but for personal use it can be done i.e write to DirRootExtenal.

And that is all I need as it does what I need it to do and have no intention to publish it in the playstore.
 
fwizardy said:
Noted...

Thank you for your support

Regards..
Click to expand...
See if the attached project will create a file named LogoUseyyyymmdd_hhmmss.pdf in your DirRootExternal. Allow/select the required permissions when asked to do so.

You need to have the JAR and XML in post #6 in your B4A additional library folder.

Just fill in some rubbish is the initial fields (Auditor(s), Auditee, Department) and click on button Start Audit. Then just click on button Save PDF of the next UI and click on Yes when asked if Audit is completed. Then go to your DirRootExternal and see if the PDF is there and if you can open it and then let us all know if it is working or not. Sometimes one needs to do some serious homework to make some things work.......It is not just all falling from the sky. It takes a lot of time and effort to get to the end goal.
 

Attachments

Last edited:
fwizardy said:
Noted...

Thank you for your support

Regards..
Click to expand...
I don't need a like for post #15 above. I need to know if it is working for you or not. You can remove the like. Not important to me whatsoever but need to know from you if it is working or not. Does it create a PDF in your DirRootExternal that you can open?
 
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