jscript读写二进制文件的方法

前端技术 2023/09/06 JavaScript

本文实例讲述了jscript读写二进制文件的方法。分享给大家供大家参考。具体实现方法如下：

var bin = new Array(256);
for(var i=0;i<256;i++){
  bin[i]=String.fromCharCode(i);
}
function TestWrite(){
  var Stream = new ActiveXObject(\"ADODB.Stream\");
  var adTypeBinary=1,adTypeText=2;
  Stream.Type = adTypeText;
  Stream.CharSet = \"iso-8859-1\";
  Stream.Open();
  //Stream.WriteText(\"\\x00\\x01\\x02\\xff\\xff\");
  for(var i=0;i<256;i++){
    Stream.WriteText(String.fromCharCode(i));
    //Stream.WriteText(bin[i]);
  }
  Stream.SaveToFile(\"c:\\\\windows\\\\temp\\\\test.bin\", 2);
  Stream.Close();
  Stream = null;
}
function BinaryFile(filepath){
  var adTypeBinary=1,adTypeText=2;
  var adSaveCreateNotExist=1,adSaveCreateOverWrite=2;
  var adReadAll=-1,adReadLine=-2;
  this.path=filepath;
  this.WriteAll = function(content){
    var Stream = new ActiveXObject(\"ADODB.Stream\");
    Stream.Type = adTypeText;
    Stream.CharSet = \"iso-8859-1\";
    Stream.Open();
    Stream.WriteText(content);
    Stream.SaveToFile(this.path, adSaveCreateOverWrite);
    Stream.Close();
    Stream = null;
  }
  this.ReadAll = function(){
    var Stream = new ActiveXObject(\"ADODB.Stream\");
    Stream.Type = adTypeText;
    Stream.CharSet = \"iso-8859-1\";
    Stream.Open();
    Stream.LoadFromFile(this.path);
    var content = Stream.ReadText(adReadAll);
    Stream.Close();
    Stream = null;
    return content;
  }
}

用法示例如下：

var crFolder = \'C:/Temp/cr\'
var bf1=new BinaryFile(crFolder+\"/PCDV0026.JPG\");
var bf2=new BinaryFile(crFolder+\"/PCDV0026_.JPG\");
bf2.WriteAll(bf1.ReadAll());

希望本文所述对大家的javascript程序设计有所帮助。

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