PSSaveAsImage

PSSaveAsImage function

将 Postscript 转换为图像。

function AsposePSSaveAsImage(
    fileBlob, 
    fileName, 
    imageFormat, 
    supressErrors
)

参数	类型	描述
fileBlob	Blob 对象	用于转换的源字体内容。
fileName	string	文件名。
imageFormat	ImageFormat	要转换成的图像格式。
supressErrors	bool	指定是否必须抑制错误。

返回值

JSON 对象

字段	描述
	errorCode
	errorText
	fileNameResult

示例

  var fPsAsPng = function (e) {
    const file_reader = new FileReader();
    file_reader.onload = (event) => {
      const json = PSSaveAsImage(event.target.result, e.target.files[0].name, Module.ImageFormat.Png, true);
      if (json.errorCode == 0) {
        document.getElementById('output').textContent = "Files(pages) count: " + json.filesCount.toString();
        for (let fileIndex = 0; fileIndex < json.filesCount; fileIndex++) DownloadFile(json.filesNameResult[fileIndex], "image/png");
      }
      else 
        document.getElementById('output').textContent = json.errorText;
    }
    file_reader.readAsArrayBuffer(e.target.files[0]);
  }

Web Worker example:

  /*Create Web Worker*/
  const AsposePageWebWorker = new Worker("AsposePageforJS.js");
  AsposePageWebWorker.onerror = evt => console.log(`Error from Web Worker: ${evt.message}`);
  AsposePageWebWorker.onmessage = evt => document.getElementById('output').textContent = 
    (evt.data == 'ready') ? 'library loaded!' :
      (evt.data.json.errorCode == 0) ? `Result:\n${DownloadFile(evt.data.json.fileNameResult, "application/image", evt.data.params[0])}` : `Error: ${evt.data.json.errorText}`;

  /*Event handler*/
  const fPsAsPng = e => {
    const file_reader = new FileReader();
    file_reader.onload = event => {
      /*Convert a Postscript to PNG and save - Ask Web Worker*/
      AsposePageWebWorker.postMessage({ "operation": 'AsposePSSaveAsImage', "params": [event.target.result, e.target.files[0].name, 'Module.ImageFormat.Png'] }, [event.target.result]);
    };
    file_reader.readAsArrayBuffer(e.target.files[0]);
  };

  /*Make a link to download the result file*/
  const DownloadFile = function (filename, mime, content) {
      mime = mime || "application/octet-stream";
      var link = document.createElement("a"); 
      link.href = URL.createObjectURL(new Blob([content], {type: mime}));
      link.download = filename;
      link.textContent = filename;
      link.title = "Click here to download the file";
      document.getElementById('fileDownload').appendChild(link);
      document.getElementById('fileDownload').appendChild(document.createElement("br"));
  }

另见

• function PSSaveAsPdf
• enum ImageFormat