Question

我需要使用int number1, number2, number3, number4; if (Int32.TryParse(textBox1.Text, out number1) && Int32.TryParse(textBox2.Text, out number2) && Int32.TryParse(textBox3.Text, out number3) && Int32.TryParse(textBox4.Text, out number4)) { if(number1 + number2 + number3 + number4 == 100) MessageBox.Show("Activated"); else MessageBox.Show("License key is not valid.", "License key is not valid.", MessageBoxButtons.OK, MessageBoxIcon.Stop); } else MessageBox.Show("No letters allowed in the textboxes.", "No letters allowed in the textboxes", MessageBoxButtons.OK, MessageBoxIcon.Stop);创建pdf，并且已经遵循this blog。但这是行不通的。你能告诉我为什么吗？

注意：错误在此行blob上发出。这是在const fileEntry = await上。在浏览器上，它运行正常（即android device）。

this.pdfObj.download();

这是错误：

  constructor(
    private file: File,
    private platform: Platform,
    private fileOpener: FileOpener,
  ) {
  }

downloadReport() {
    this.createPdf();
    if (this.platform.is('cordova')) {
      try {
        this.pdfObj.getBuffer(async (buffer) => {
          var utf8=new Uint8Array(buffer);
          var binaryArray=utf8.buffer;
          var blob = new Blob([binaryArray], { type: 'application/pdf' });

          const fileEntry = await this.file.writeFile(this.file.dataDirectory, 'myletter.pdf', blob, { replace: true });
          this.fileOpener.open(this.file.dataDirectory + 'myletter.pdf', 'application/pdf');
        });
      }
      catch (err) {
        console.log(err);
      }

    } else {
      // On a browser simply use download!
      this.pdfObj.download();
    }
  }  



createPdf() {
    var docDefinition = {
      content: [
        { text: 'REMINDER', style: 'header' },
        { text: new Date().toTimeString(), alignment: 'right' },

        { text: 'From', style: 'subheader' }, { text: 'from' },

        { text: 'To', style: 'subheader' }, 'To',

        { text: 'Sam lokuge', style: 'story', margin: [0, 20, 0, 20] },

        {
          ul: [
            'Bacon',
            'Rips',
            'BBQ',
          ]
        }
      ],
      styles: {
        header: {
          fontSize: 18,
          bold: true,
        },
        subheader: {
          fontSize: 14,
          bold: true,
          margin: [0, 15, 0, 0]
        },
        story: {
          italic: true,
          alignment: 'center',
          width: '50%',
        }
      }
    }
    this.pdfObj = pdfMake.createPdf(docDefinition);
  }

Answer 1

我在这里找到了问题。这是由于此路径this.file.dataDirectory。但是错误消息并未明确提及。因此，花了很多时间来确定问题。最后，我更改了路径，然后没有问题。我使用了此路径this.file.externalApplicationStorageDirectory，现在可以正常使用了。

错误：未被捕获（承诺）：具有Ionic本机文件插件的[object Object]

1 个答案: