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Resolved Display or Save a Blob to PDF save on local machine.
  1. How-to
0 Votes
  1. Luis Alberto Coca
  2. PowerBuilder
  3. Monday, 28 March 2022 12:50 AM UTC

I am using PB2019R3 consuming with an API that returns a PDF in Blob. I use HttpClient supports Blob response, checking the size of the file I use Len and it is correct.

My problem is how to convert or decode the Blob to PDF to save on local machine.

Reading Powerbuilder 2019R3 documentation, I can't find anything related. In forums I find FileOpen , FileReadEx and OleObject mentioned but no luck.

Only the WebBrowser that supports JavaScript seems to me the best option. First I test creating the script in an html5 and it works I can see the PDF in the Web browser, 

  <script>
    fetch(getInvoice, {
      method: "GET",
      headers: {
        "Content-Type": "Application/PDF",
        Authorization: "Bearer " + dataToken,
      },
    })
      .then((Res) => {
        if (Res.status === 200) {
          return Res.blob();
          //return Res.text();
        } else {
          alert("Error Status :" + Res.status);
        }
      })
      .then((data) => {
        const domString = URL.createObjectURL(data);
        document.querySelector("#DisplayPdf").setAttribute("src", domString);
      });
  </script>

now I pass it to EvaluateJavascriptSync and it seems that it does not support fetch. I test with XMLHttpRequest

ls_get_invoice_pdf = 'function get_invoice_Display() {'+&
'   fetch(getInvoice,{'+&
'        method: "GET",'+&
'        headers:{;'+&
'            "Content-Type": "Application/PDF",'+&
'            "Authorization": "Bearer " + dataToken,'+&
'        },'+&
'    })'+&
'    .then(Res => {'+&
'        if(Res.status === 200){'+&
'            return Res.blob();'+&
'        }else{'+&
'            alert("Error Status :" + Res.status);'+&
'        }'+&
'    })'+&
'    .then((data) => {;'+&
'       const domString = URL.createObjectURL(data);'+&
'	document.body.innerHTML = `'+& 
'    <embed '+& 
'      src=""'+& 
'      type="application/pdf"'+& 
'      width="800px"+& 
'      height="600px"'+& 
'      id="DisplayPdf"'+& 
'    />'+&
'`;'+&
'      document.querySelector("#DisplayPdf").setAttribute("src", domString);'+&
'    });'+&
'} get_invoice_Display(); '
wb_webbrowser_pdf.evaluatejavascriptsync(ls_get_invoice_pdf)
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