topic Re: Error in Base64 string decoding from .Net in Application Development and Automation Discussions

Error in Base64 string decoding from .Net

Former Member — Fri, 07 Jun 2013 12:20:02 GMT

Hi experts,

I have a report for creating the payslip in PDF format. It is working fine, first I get the output in OTF format and later with the FM CONVERT_OTF_2_PDF I save it into PDF file.

Now I have created a Function Module to publish as a Web Service and I want return the output of the FM CONVERT_OTF_2_PDF in Base64 format to consume this web service from a .Net application.

The problem is, after generating the PDF encoding as Base64 string format, it is not decoded well in the .net application.

I have done another test from the .net enviroment, I have encoded the PDF file created before from Sap/abap as a base64 string with the .net, and after this I have decoded and saved it as a PDF and all the steps have worked fine.

Later I have compared the base64 strings: One generated from ABAP and another generated from .Net. The begining of the strings are the same until the position 12320, from this point the characters change until the end of the string.

How should I create the base64 string in abap to create the correct string and decode lately in a .Net application to show the PDF file?

I attached the files generated from abap and the other one generated from .Net.

The One generated from Abap after decoding doesn't show the PDF file correctly but the other one created created from the .Net application It shows correctly.

Thanks for your help.

Kind regards,

Julian.

Re: Error in Base64 string decoding from .Net

Former Member — Fri, 07 Jun 2013 13:10:22 GMT

You can try converting OTF (pdf_t_cust_otf) directly to xstring using function module CONVERT_OTF.

In this snippet, pdf xstring data will come to variable p_cust_xpdf.

If bin_file parameter is not passed, p_pdftab gets filled.

* convert OTF data to pdf xstring
  call function 'CONVERT_OTF'
    exporting
      format                = 'PDF'
    importing
      bin_filesize          = p_cust_xpdf_size
      bin_file              = p_cust_xpdf
    tables
      otf                   = p_t_cust_otf
      lines                 = p_pdftab
    exceptions
      err_max_linewidth     = 1
      err_format            = 2
      err_conv_not_possible = 3
      err_bad_otf           = 4
      others                = 5.

Re: Error in Base64 string decoding from .Net

arindam_m — Fri, 07 Jun 2013 13:41:17 GMT

Hi,

Are you using FM SCMS_BASE64_ENCODE_STR to encode?

Cheers,

Arindam

Re: Error in Base64 string decoding from .Net

Former Member — Mon, 10 Jun 2013 05:31:48 GMT

Hello Arindam,

Yes, I'm using the scms_base64_encode_str.

Kind regards,

Julian.

Re: Error in Base64 string decoding from .Net

Former Member — Mon, 10 Jun 2013 05:34:53 GMT

Thanks Manish,

Using the FM CONVERT_OTF how should I pass to .Net the PDF?

As a xstring? or also I should change it to base64?

Kind regards,

Julian.

Re: Error in Base64 string decoding from .Net

Former Member — Mon, 10 Jun 2013 06:25:05 GMT

I would say pass base64 encoded string.

In ABAP Debugger, the content of xstring and equivalent string look same, only type differs.

Not sure of data type in .NET which will store the base64 string. (probably string type)

Re: Error in Base64 string decoding from .Net

Former Member — Mon, 10 Jun 2013 12:36:47 GMT

Thanks,

Following your comments it's working right.

Kind regards,

Julian.

Re: Error in Base64 string decoding from .Net

Former Member — Fri, 21 Jun 2013 14:39:31 GMT

Julian,

What did you do on the .NET side to but the BASE64 into the response? Are you decoding and then just "Response.Write" or something different? I can't seem to get the data to actually become a "real" PDF.

Re: Error in Base64 string decoding from .Net

Former Member — Fri, 21 Jun 2013 16:28:24 GMT

This calls for a detailed blog post or document.

Re: Error in Base64 string decoding from .Net

Former Member — Mon, 01 Jul 2013 05:45:31 GMT

Hello,

I have something similar to:

---

local.emaya.emades012.ZhrEssReciboNomResponse salida = new WindowsFormsApplication1.local.emaya.emades012.ZhrEssReciboNomResponse();
local.emaya.emades012.ZhrEssReciboNom entrada = new WindowsFormsApplication1.local.emaya.emades012.ZhrEssReciboNom();

System.Net.NetworkCredential credentials = new System.Net.NetworkCredential("SAP-USER", "*************");
local.emaya.emades012.ZWS_ESS_RECIBO_NOM ws = new local.emaya.emades012.ZWS_ESS_RECIBO_NOM();

ws.Credentials = credentials;
entrada.pernr = "101800";

salida = ws.ZhrEssReciboNom(entrada);

int i;
i = salida.Pdfbase64.Length;

            byte[] bytes = Convert.FromBase64String(salida.Pdfbase64);

            System.IO.FileStream stream = new System.IO.FileStream(@"C:\temp\output_file_PDF.pdf", System.IO.FileMode.CreateNew);
            System.IO.BinaryWriter writer = new System.IO.BinaryWriter(stream);
            writer.Write(bytes, 0, bytes.Length);
            writer.Close();

---

Kind regards,

Julian.