C#使文件類型與程式關聯

清疚 2022-08-25 02:28 153阅读 0赞

要注冊 自定義文件類型,包括文件關聯圖標,文件關聯應用程式等,這些操作都是通過修改注冊表來完成.

1.為便代碼清晰,首先將注冊需要的信息封裝到FileTypeRegInfo類中.

public  class  FileTypeRegInfo  
\{  
 ///  <summary>   
 ///  目标类型文件的扩展名  
 ///  </summary>   
  public  string  ExtendName;  // ".xcf"   
   
 ///  <summary>   
 ///  目标文件类型说明  
 ///  </summary>   
  public  string  Description;  // "XCodeFactory项目文件"   
   
 ///  <summary>   
 ///  目标类型文件关联的图标  
 ///  </summary>   
  public  string  IcoPath;  
  
 ///  <summary>   
 ///  打开目标类型文件的应用程序  
 ///  </summary>   
  public  string  ExePath;  
  
 public  FileTypeRegInfo()  
\{  
\}  
  
 public  FileTypeRegInfo( string  extendName)  
\{  
 this .ExtendName  =  extendName;  
\}  
\}

2.編寫注冊文件類型的類.

///  <summary>   
 ///  FileTypeRegister 用于注册自定义的文件类型。  
 ///  </summary>   
  public  class  FileTypeRegister  
\{  
 \#region  RegisterFileType   
 ///  <summary>   
 ///  RegisterFileType 使文件类型与对应的图标及应用程序关联起来。  
 ///  </summary>    
  public  static  void  RegisterFileType(FileTypeRegInfo regInfo)  
\{  
 if  (RegistryHelper.FileTypeRegistered(regInfo.ExtendName))  
\{  
 return ;  
\}  
  
 string  relationName  =  regInfo.ExtendName.Substring( 1 , regInfo.ExtendName.Length  \-  1 ).ToUpper()  \+  " \_FileType " ;  
  
RegistryKey fileTypeKey  =  Registry.ClassesRoot.CreateSubKey(regInfo.ExtendName);  
fileTypeKey.SetValue( "" , relationName);  
fileTypeKey.Close();  
  
RegistryKey relationKey  =  Registry.ClassesRoot.CreateSubKey(relationName);  
relationKey.SetValue( "" , regInfo.Description);  
  
RegistryKey iconKey  =  relationKey.CreateSubKey( " DefaultIcon " );  
iconKey.SetValue( "" , regInfo.IcoPath);  
  
RegistryKey shellKey  =  relationKey.CreateSubKey( " Shell " );  
RegistryKey openKey  =  shellKey.CreateSubKey( " Open " );  
RegistryKey commandKey  =  openKey.CreateSubKey( " Command " );  
commandKey.SetValue( "" , regInfo.ExePath  \+  "  %1 " );  
  
relationKey.Close();  
\}  
  
 ///  <summary>   
 ///  GetFileTypeRegInfo 得到指定文件类型关联信息  
 ///  </summary>    
  public  static  FileTypeRegInfo GetFileTypeRegInfo( string  extendName)  
\{  
 if  ( ! RegistryHelper.FileTypeRegistered(extendName))  
\{  
 return  null ;  
\}  
  
FileTypeRegInfo regInfo  =  new  FileTypeRegInfo(extendName);  
  
 string  relationName  =  extendName.Substring( 1 , extendName.Length  \-  1 ).ToUpper()  \+  " \_FileType " ;  
RegistryKey relationKey  =  Registry.ClassesRoot.OpenSubKey(relationName);  
regInfo.Description  =  relationKey.GetValue( "" ).ToString();  
  
RegistryKey iconKey  =  relationKey.OpenSubKey( " DefaultIcon " );  
regInfo.IcoPath  =  iconKey.GetValue( "" ).ToString();  
  
RegistryKey shellKey  =  relationKey.OpenSubKey( " Shell " );  
RegistryKey openKey  =  shellKey.OpenSubKey( " Open " );  
RegistryKey commandKey  =  openKey.OpenSubKey( " Command " );  
 string  temp  =  commandKey.GetValue( "" ).ToString();  
regInfo.ExePath  =  temp.Substring( 0 , temp.Length  \-  3 );  
  
 return  regInfo;  
\}  
  
 ///  <summary>   
 ///  UpdateFileTypeRegInfo 更新指定文件类型关联信息  
 ///  </summary>    
  public  static  bool  UpdateFileTypeRegInfo(FileTypeRegInfo regInfo)  
\{  
 if  ( ! RegistryHelper.FileTypeRegistered(regInfo.ExtendName))  
\{  
 return  false ;  
\}  
 string  extendName  =  regInfo.ExtendName;  
 string  relationName  =  extendName.Substring( 1 , extendName.Length  \-  1 ).ToUpper()  \+  " \_FileType " ;  
RegistryKey relationKey  =  Registry.ClassesRoot.OpenSubKey(relationName,  true );  
relationKey.SetValue( "" , regInfo.Description);  
  
RegistryKey iconKey  =  relationKey.OpenSubKey( " DefaultIcon " ,  true );  
iconKey.SetValue( "" , regInfo.IcoPath);  
  
RegistryKey shellKey  =  relationKey.OpenSubKey( " Shell " );  
RegistryKey openKey  =  shellKey.OpenSubKey( " Open " );  
RegistryKey commandKey  =  openKey.OpenSubKey( " Command " ,  true );  
commandKey.SetValue( "" , regInfo.ExePath  \+  "  %1 " );  
  
relationKey.Close();  
 return  true ;  
\}  
  
 ///  <summary>   
 ///  FileTypeRegistered 指定文件类型是否已经注册  
 ///  </summary>    
  public  static  bool  FileTypeRegistered( string  extendName)  
\{  
RegistryKey softwareKey  =  Registry.ClassesRoot.OpenSubKey(extendName);  
 if  (softwareKey  !=  null )  
\{  
 return  true ;  
\}  
  
 return  false ;  
\}  
 \#endregion   
\}

3.注意上段代碼中commandKey.SetValue("" ,regInfo.ExePath + " %1") ;其中" %1"表示将被双击的文件的路径传给目标应用程序，这样在双击a.xcf文件时，XCodeFactory才知道要打开哪个文件，所以应用程序的Main方法要被改写为带有参数的形式,如下所示:

\[STAThread\]  
 static  void  Main( string \[\] args)  
\{  
 if  ((args  !=  null )  &&  (args.Length  >  0 ))  
\{  
 string  filePath  =  "" ;  
 for  ( int  i  =  0 ; i  <  args.Length; i \++ )  
\{  
filePath  \+=  "  "  \+  args\[i\];  
\}  
  
MainForm.XcfFilePath  =  filePath.Trim();  
\}  
  
Application.Run( new  MainForm());  
\}

4.通过文件的扩展名取得 與扩展名相对应的文件类型的图标

\[DllImport( " Shell32.dll " )\]  
 static  extern  int  SHGetFileInfo( string  pszPath,  uint  dwFileAttributes,  ref  SHFILEINFO psfi,  uint  cbFileInfo,  uint  uFlags);  
 ///  <summary>   
 ///  要用到的一个结构  
 ///  </summary>    
  struct  SHFILEINFO  
\{  
 public  IntPtr hIcon;  
 public  int  iIcon;  
 public  uint  dwAttributes;  
 public  char  szDisplayName;  
 public  char  szTypeName;  
\}  
  
 ///  <summary>   
 ///  从文件扩展名得到小图标  
 ///  </summary>   
 ///  <param name="FileName"> 文件名或文件扩展名 </param>   
 ///  <returns> 图标 </returns>    
  static  public  Icon SetIcon( string  FileName)  
\{  
SHFILEINFO fi  =  new  SHFILEINFO();  
Icon ic  =  null ;  
 int  iTotal  =  ( int )SHGetFileInfo(FileName,  100 ,  ref  fi,  0 ,  273 ); // 从文件扩展名得到小图标  
 // SHGFI\_ICON+SHGFI\_USEFILEATTRIBUTES+SmallIcon  
 // 273=十六进100 +10 +1  
 // 如果要大图标,改为272    
  if  (iTotal  >  0 )  
\{  
ic  =  Icon.FromHandle(fi.hIcon);  
\}  
 return  ic;  
\}

5.總結

由於擔心破壞注冊表,所以以上代碼我並沒有做測試,但我仍然查看了一下我的注冊表中的內容,我用的是win2k,從注冊表看到,並沒有看到本文所寫的Shell,Open,Command等鍵,具體是什麼結構我也沒看出來,估計文件關聯與操作系統的不同也有關系,這篇文章暫且寄存在此,等以後需要時再做詳細研究.

參考文章: [http://www.gissky.com/Develop/ShowArticle.Asp?Sid=21&ID=1523][http_www.gissky.com_Develop_ShowArticle.Asp_Sid_21_ID_1523] 及[http://topic.csdn.net/t/20060921/22/5039676.html][http_topic.csdn.net_t_20060921_22_5039676.html]

[http_www.gissky.com_Develop_ShowArticle.Asp_Sid_21_ID_1523]: http://www.gissky.com/Develop/ShowArticle.Asp?Sid=21&ID=1523
[http_topic.csdn.net_t_20060921_22_5039676.html]: http://topic.csdn.net/t/20060921/22/5039676.html