在ReactJS / Javascript中将Base64转换为PDF文件时遇到错误

时间:2020-08-04 09:46:14

标签: javascript reactjs pdf pdf-generation blob

我正在努力将PDF作为附件显示在ReactJS中。我设法将base64带到前端,但是在尝试创建blob对象后,它不起作用,尽管它进入了Acrobat阅读器,但显示了错误。请提供任何建议,因为我如何将base64正确转换为pdf。

我还上传了在pastebin https://pastebin.com/W4zEXyPy上进行控制台日志记录时获得的base64代码。

注意: 当我尝试在https://base64.guru/进行修复时,它显示了无效的字符串和字符(数据:应用程序/ pdf;),因此我尝试使用content.slice(29);,因此它将从JVB...开始(而不是从data:application/pdf;base64,JVBERi0xL........),但收到相同的错误。 Link to pic of Repair Base64 atbase64guru

Error:未正确解码

  • NodeJS baackend代码响应API调用

         let token = req.cookies.access_token;
             if (token) {
               let Invoice_No_Actual = req.body.invoice_Name;
               res.set("Content-disposition", "attachment; filename=" + `${__dirname}\\` + `${Invoice_No_Actual}` + `.pdf`);
               res.contentType("application/pdf");
               res.send(`data:application/pdf;base64,${new Buffer.from(data).toString("base64")}`);
             }
           });
    
  • 前端代码 API调用

     const headers = new Headers();
            headers.append("content-type", "application/json");
            headers.append("responseType", "application/pdf");
    
            const options = {
              method: "POST",
              headers,
              credentials: "include",
              body: JSON.stringify(invoice_Object),
              // body: "My HTML String",
            };
    
            const newRequest = new Request("http://localhost:5000/api/invoice-only", options);
    
            (async () => {
              const invoice_Call = await fetch(newRequest)
                .then((res) => {
                  return text1 = res.text();
                })
                .then((data) => {
                 generateFile(data, invoice_Name);
                });
            })();
          };
    
  • generateFile()函数调用前端-收到响应后


    let generateFile = (content, fileName) => {
    
        console.log("content", content); // here at console if i copy the code and use online tool(https://base64.guru/converter/decode/pdf) it shows the correct pdf

        let content1= content.slice(29);// content1 is correct base64 as if i use it online tool it correctly generate the PDF document
        const blob = new Blob([content1], { type: "application/pdf" });
        console.log(blob);
        const link = document.createElement("a");
        link.href = window.URL.createObjectURL(blob);
        link.download = fileName;
        link.click();
      };

1 个答案:

答案 0 :(得分:1)

简单的console.log(content.slice(29))可能会显示您的错误。问题是content1变量包含一个以“ VBE…”开头的字符串,而它必须以“ JVBE…”开头。因此,您的错误是slice()函数丢弃了太多字符。