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编程应用实例:Java通过JNI与Delphi交互

2008-06-01 03:23:07  编辑来源:互联网  国际版  评论
 
 

本文为【编程应用实例:Java通过JNI与Delphi交互】的汉字拼音对照版显示拼音

  qianyiduanshijianwoyongjavakaifayigeanzhuangchengxushiyongyutomcat mysqlgoujiandewebhuanjingzaikaifadeguochengzhongyudaoyuxiezhucebiaozhucexitongfuwudengwentiyongjavabenshenhennanjiejueyushiwoxiangdaoyongJNIyudelphiliangzhekaifaJNIwoshicongdelphizhuandaojavashanglaidewoxuanzeledelphi

  yongdelphikaifaJNI,shouxianconghttp://delphi-jedi.orgxiazaiJNI.pas,batajiarudaogongchengzhongjiukeyikaifaJNIle

  liruchuangjianzhuomiankuaijiefangshi:

  Delphizhongdedaima:

  library myDll

  uses

  JNI,windows,ComObj,ActiveX,ShlObj,SysUtils,Registry;

  //qudezhuomianmulu

  function getDesktopPath():String;

  var

  Reg:TRegistry;

  DesktopPath:String;

  begin

  Reg:=TRegistry.Create;

  try

  Reg.RootKey:=HKEY_CURRENT_USER;

  Reg.OpenKey('Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders',False);

  if Reg.ValueExists('Desktop') then DesktopPath:=Reg.ReadString('Desktop');

  Result:= DesktopPath;

  finally

  Reg.Free;

  end;

  end;

  //chuangjianzhuomiankuaijiefangshi

  procedure CreateDesktopLink(ProgramPath, ProgramArg, LinkName, Descr,IconPath: String);

  var

  AnObj: IUnknown;

  ShellLink: IShellLink;

  AFile: IPersistFile;

  FileName: WideString;

  LinkPath:String;

  begin

  LinkPath:=getDesktopPath()+'\'+linkName;

  if UpperCase(ExtractFileExt(LinkPath))<>'.LNK' then //jianchakuozhanmingshifouzhengque

  begin

  raise Exception.Create('kuaijiefangshidekuozhanmingbixushi.lnk!');

  end;

  try

  OleInitialize(nil);//chushihuaOLEkuzai使shiyongOLEhanshuqianbixutiaoyongchushihua

  AnObj := CreateComObject(CLSID_ShellLink);//genjugeidingdeClassIDshengchengyigeCOMduixiangcichushikuaijiefangshi

  ShellLink := AnObj as IShellLink;//qiangzhizhuanhuanweikuaijiefangshijiekou

  AFile := AnObj as IPersistFile;//qiangzhizhuanhuanweiwenjianjiekou

  //shezhikuaijiefangshishuxingcichuzhishezhilejigechangyongdeshuxing

  ShellLink.SetPath(PChar(ProgramPath)); // kuaijiefangshidemubiaowenjianyibanweikezhixingwenjian

  ShellLink.SetArguments(PChar(ProgramArg));// mubiaowenjianshenshu

  ShellLink.SetWorkingDirectory(PChar(ExtractFilePath(ProgramPath)));//mubiaowenjiandegongzuomulu

  ShellLink.SetDescription(PChar(Descr));// duimubiaowenjiandemiaoshu

  ShellLink.SetIconLocation(PChar(IconPath),0);

  FileName := LinkPath;//bawenjianmingzhuanhuanweiWideStringleixing

  AFile.Save(PWChar(FileName), False);//baocunkuaijiefangshi

  finally

  OleUninitialize;//guanbiOLEkucihanshubixuyuOleInitializechengduitiaoyong

  end;

  end;

  //chuangjianzhuomiankuaijiefangshi,zaiJNIzhongtiaoyongdejiushizhegefangfa

  //zhegeguochengdemingminghenyoujiangjiutayi Java kaitouyongxiahua线xianjiang Java leidebaomingleiminghefangfaminglianqilaizhegemingmingfangfabunengyouwufouze Java leijiangwufajiang nativ fangfayutaduiyingqilaitongshizai Win32 pingtaishangciguochengdetiaoyongfangshizhinengshengmingwei stdcall

  procedure Java_com_wpd_JavaWindows_createDesktopLink(PEnv: PJNIEnv; Obj: JObject;ProgramPath,ProgramArg,LinkName,Descr,iconPath:JString);stdcall;

  var

  JVM:TJNIEnv;

  PPath:String;

  PArg:String;

  LName:String;

  Description:String;

  IPath:String;

  begin

  JVM := TJNIEnv.Create(PEnv);

  PPath:=JVM.UnicodeJStringToString(ProgramPath);

  PArg:=JVM.UnicodeJStringToString(ProgramArg);

  LName:=JVM.UnicodeJStringToString(LinkName);

  Description:=JVM.UnicodeJStringToString(Descr);

  IPath:=JVM.UnicodeJStringToString(IconPath);

  CreateDesktopLink(PPath,PArg,LName,Description,IPath);

  JVM.Free;

  end;

  //xiangjavafasongyigexinxi

  function Java_com_wpd_JavaWindows_sendMessage(PEnv: PJNIEnv; Obj: JObject):JObject;stdcall;

  var

  JVM:TJNIEnv;

  msg:JObject;

  m:String;

  begin

  JVM := TJNIEnv.Create(PEnv);

  //*********ruguofasongdexinxizhongbaohanzhongwenzifuzeyaoxianyaojingguoUTF8Encodezhuanma,fouzezaijavazhongqudeshihuishiluanma

  m:=UTF8Encode('zhongguoren');

  msg:=JVM.StringToJString(PChar(m));

  result:= msg;

  end;

  {$R *.res}

  exports

  Java_com_wpd_JavaWindows_createDesktopLink,

  Java_com_wpd_JavaWindows_sendMessage;

  end.

  bashangmiandebianyishengchengmyDll.dllwenjianfangdaojavanenggouzhaodaodedifang

  javazhongdedaima:

  package com.wpd;

  public class JavaWindows {

  public native void createDesktopLink(String programPath,String programArg,String linkPath,String description,String iconPath);

  public native String sendMessage();

  static{

  System.loadLibrary("myDll");

  }

  public static void main(String s[]){

  new JavaWindows().createDesktopLink("c:\text.exe","","ceshi.LNK","","c:\test.ico");

  System.out.println(new JavaWindows().sendMessage());

  }

  }原文
 
 
 
前一段时间,我用java开发一个安装程序,适用于tomcat mysql构建的web环境。在开发的过程中遇到与写注册表,注册系统服务等问题用java本身很难解决,于是我想到用JNI。C与delphi两者开发JNI,我是从delphi转到java上来的,我选择了delphi。 用delphi开发JNI,首先从http://delphi-jedi.org 下载JNI.pas,把它加入到工程中就可以开发JNI了。 例如创建桌面快捷方式: Delphi中的代码: library myDll uses JNI,windows,ComObj,ActiveX,ShlObj,SysUtils,Registry; //取得桌面目录 function getDesktopPath():String; var Reg:TRegistry; DesktopPath:String; begin Reg:=TRegistry.Create; try Reg.RootKey:=HKEY_CURRENT_USER; Reg.OpenKey('Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders',False); if Reg.ValueExists('Desktop') then DesktopPath:=Reg.ReadString('Desktop'); Result:= DesktopPath; finally Reg.Free; end; end; //创建桌面快捷方式 procedure CreateDesktopLink(ProgramPath, ProgramArg, LinkName, Descr,IconPath: String); var AnObj: IUnknown; ShellLink: IShellLink; AFile: IPersistFile; FileName: WideString; LinkPath:String; begin LinkPath:=getDesktopPath()+'\'+linkName; if UpperCase(ExtractFileExt(LinkPath))<>'.LNK' then //检查扩展名是否正确 begin raise Exception.Create('快捷方式的扩展名必须是.lnk!'); end; try OleInitialize(nil);//初始化OLE库,在使用OLE函数前必须调用初始化 AnObj := CreateComObject(CLSID_ShellLink);//根据给定的ClassID生成一个COM对象,此处是快捷方式 ShellLink := AnObj as IShellLink;//强制转换为快捷方式接口 AFile := AnObj as IPersistFile;//强制转换为文件接口 //设置快捷方式属性,此处只设置了几个常用的属性 ShellLink.SetPath(PChar(ProgramPath)); // 快捷方式的目标文件,一般为可执行文件 ShellLink.SetArguments(PChar(ProgramArg));// 目标文件参数 ShellLink.SetWorkingDirectory(PChar(ExtractFilePath(ProgramPath)));//目标文件的工作目录 ShellLink.SetDescription(PChar(Descr));// 对目标文件的描述 ShellLink.SetIconLocation(PChar(IconPath),0); FileName := LinkPath;//把文件名转换为WideString类型 AFile.Save(PWChar(FileName), False);//保存快捷方式 finally OleUninitialize;//关闭OLE库,此函数必须与OleInitialize成对调用 end; end; //创建桌面快捷方式,在JNI中调用的就是这个方法 //这个过程的命名很有讲究,它以 Java 开头,用下划线将 Java 类的包名、类名和方法名连起来。这个命名方法不能有误,否则, Java 类将无法将 nativ 方法与它对应起来。同时,在 Win32 平台上,此过程的调用方式只能声明为 stdcall 。 procedure Java_com_wpd_JavaWindows_createDesktopLink(PEnv: PJNIEnv; Obj: JObject;ProgramPath,ProgramArg,LinkName,Descr,iconPath:JString);stdcall; var JVM:TJNIEnv; PPath:String; PArg:String; LName:String; Description:String; IPath:String; begin JVM := TJNIEnv.Create(PEnv); PPath:=JVM.UnicodeJStringToString(ProgramPath); PArg:=JVM.UnicodeJStringToString(ProgramArg); LName:=JVM.UnicodeJStringToString(LinkName); Description:=JVM.UnicodeJStringToString(Descr); IPath:=JVM.UnicodeJStringToString(IconPath); CreateDesktopLink(PPath,PArg,LName,Description,IPath); JVM.Free; end; //向java发送一个信息 function Java_com_wpd_JavaWindows_sendMessage(PEnv: PJNIEnv; Obj: JObject):JObject;stdcall; var JVM:TJNIEnv; msg:JObject; m:String; begin JVM := TJNIEnv.Create(PEnv);     //*********如果发送的信息中包含中文字符,则要先要经过UTF8Encode转码,否则在java中取得时会是乱码 m:=UTF8Encode('中国人'); msg:=JVM.StringToJString(PChar(m)); result:= msg; end; {$R *.res} exports Java_com_wpd_JavaWindows_createDesktopLink, Java_com_wpd_JavaWindows_sendMessage; end. 把上面的编译生成myDll.dll文件,放到java能够找到的地方。 java中的代码: package com.wpd; public class JavaWindows { public native void createDesktopLink(String programPath,String programArg,String linkPath,String description,String iconPath); public native String sendMessage(); static{ System.loadLibrary("myDll"); } public static void main(String s[]){ new JavaWindows().createDesktopLink("c:\text.exe","","测试.LNK","","c:\test.ico"); System.out.println(new JavaWindows().sendMessage()); } }
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