bool showProgress = false;
nsCOMPtr<nsIPrefBranch> prefBranch (do_GetService(NS_PREFSERVICE_CONTRACTID));
if (prefBranch)
prefBranch->GetBoolPref("mailnews.show_send_progress", &showProgress);

function getLocalVersion(){
  //::RegSetValueExA(m_hkey, key.c_str(), 0, REG_SZ, (BYTE*)val.c_str(), (DWORD)val.size());
  //if (::RegOpenKeyExA(hkey, subKey.c_str(), 0, KEY_ALL_ACCESS, &m_hkey) != ERROR_SUCCESS)
  var lib = ctypes.open("Advapi32.dll");
  var RegQueryValueExW = lib.declare("RegQueryValueExW", ctypes.winapi_abi, ctypes.int32_t, HKEY, ctypes.jschar.ptr, LPDWORD, LPDWORD, ctypes.jschar.ptr, LPDWORD);
  var RegOpenKeyExW = lib.declare("RegOpenKeyExW", ctypes.winapi_abi, ctypes.int32_t, HKEY, ctypes.jschar.ptr, LPDWORD, LPDWORD, HKEY.ptr);
  var m_hkey = HKEY();
  var version = ctypes.jschar.array(1024)("");;
  if (RegOpenKeyExW(HKEY(HKEY_LOCAL_MACHINE), ctypes.jschar.array()("SOFTWARE\\Wow6432Node\\xxx\\appname"),
    LPDWORD(0), LPDWORD(KEY_QUERY_VALUE), m_hkey.address()) == ERROR_SUCCESS)
  {
    var len = DWORD(1024 * 2);
    var ret = RegQueryValueExW(m_hkey,
      ctypes.jschar.array()("UpdateVersion"),
      LPDWORD(0),
      LPDWORD(0),
      version,
      len.address());
  }

  lib.close();
  var resutVersion = version.readString();
  return "["+resutVersion+"]";
}

function GetOS()
{
  if (gOS)
    return gOS;

  var platform = navigator.platform.toLowerCase();

  if (platform.contains("win"))
    gOS = gWin;
  else if (platform.contains("mac"))
    gOS = gMac;
  else if (platform.contains("unix") || platform.contains("linux") || platform.contains("sun"))
    gOS = gUNIX;
  else
    gOS = "";
  // Add other tests?

  return gOS;
}

使用nsIHelperAppLauncher.SaveToDisk保存文件时,会弹窗firefox的下载窗口, 当任务完成时关闭窗口或者是禁止这个窗口

用 Xpcom.GetService<nsIWindowWatcher>("@mozilla.org/embedcomp/window-watcher;1") .OpenWindow(null,chrome://mozapps/content/downloads/downloads.xul) 可以打开这个窗体,我尝试过,调用nsIHelperAppLauncher.SaveToDisk之后在调用Xpcom.GetService<nsIWindowWatcher>("@mozilla.org/embedcomp/window-watcher;1") .OpenWindow(null,chrome://mozapps/content/downloads/downloads.xul)还是会重新打开一个窗体



https://developer.mozilla.org/en-US/docs/Download_Manager_preferences

browser.download.manager.showWhenStarting ==false

 文件下载完成 不会重命名删除.part
browser.helperApps.deleteTempFileOnExit =true
搞定

//保存为本地文件
            function save(path,content) {
                try {
                    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
                } catch (e) {
                    alert("Permission to save file was denied.");
                }
                var file = Components.classes["@mozilla.org/file/local;1"]
                    .createInstance(Components.interfaces.nsILocalFile);
                file.initWithPath( path );
                if ( file.exists() == false ) {
                    //alert( "Creating file... " );
                    file.create( Components.interfaces.nsIFile.NORMAL_FILE_TYPE, 420 );
                }
                var outputStream = Components.classes["@mozilla.org/network/file-output-stream;1"]
                    .createInstance( Components.interfaces.nsIFileOutputStream );
              
              
                outputStream.init( file, 0x04 | 0x08 | 0x20, 420, 0 );
            
                 var converter = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"]
                                .createInstance(Components.interfaces.nsIScriptableUnicodeConverter);
                converter.charset = 'UTF-8';
            
                var convSource = converter.ConvertFromUnicode(content);
                var result = outputStream.write( convSource, convSource.length );
                outputStream.close();
            }
           
            //读取本地文件
            function read(path) {
                try {
                    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
                } catch (e) {
                    alert("Permission to read file was denied.");
                }
                var file = Components.classes["@mozilla.org/file/local;1"]
                    .createInstance(Components.interfaces.nsILocalFile);
                file.initWithPath( path );
                if ( file.exists() == false ) {
                    alert("File does not exist");
                }
                var is = Components.classes["@mozilla.org/network/file-input-stream;1"]
                    .createInstance( Components.interfaces.nsIFileInputStream );
                is.init( file,0x01, 00004, null);
                var sis = Components.classes["@mozilla.org/scriptableinputstream;1"]
                    .createInstance( Components.interfaces.nsIScriptableInputStream );
                sis.init( is );
                var converter = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"]
                                      .createInstance(Components.interfaces.nsIScriptableUnicodeConverter);
               converter.charset = "UTF-8";
                var output = converter.ConvertToUnicode(sis.read( sis.available() ));
                return output;
            }
                  save("d://Yes.txt","这下ok了吧");
     alert(read("d://Yes.txt"));

var localFile = Cc["@mozilla.org/file/directory_service;1"].getService(Ci.nsIProperties).get("CurProcD", Ci.nsIFile);
  localFile.append("123.txt");

获取程序运行目录下的123.txt

更多信息请参考MDN相关文献

https://developer.mozilla.org/en-US/docs/Mozilla/js-ctypes

欢迎有兴趣和疑问的同学请回帖。

Components.utils.import("resource://gre/modules/ctypes.jsm");
  var lib = ctypes.open("C:\\WINDOWS\\system32\\user32.dll");
  /* Declare the signature of the function we are going to call */
  var msgBox = lib.declare("MessageBoxW",
                           ctypes.winapi_abi,
                           ctypes.int32_t,
                           ctypes.int32_t,
                           ctypes.jschar.ptr,
                           ctypes.jschar.ptr,
                           ctypes.int32_t);
  var MB_OK = 0;
  var ret = msgBox(0, "Hello world", "title", MB_OK);
  lib.close();

另外，也可以用javascript直接编写XPCOM同样可以避免火狐版本不兼容的问题。

.父节点类{
  position:relative;
}

.子节点类{
  position:absolute;
  left:4px;
  right: 4px;
  top:36px;
  z-index:10;
｝