C ++ checks the. NET version in the registry, automatically installs the. NET installation package, and then runs the C # program.

To be honest, my c ++ skills are too weak, so I hope that people will not joke.

Do thisArticleMainly to solveSkydiaThis problem
The system automatically determines whether there is a. NET Framework. If not, install the. NET Framework!

Let's not talk about it.CodeRight!
There are still many comments in the Code. If you still have any questions, please refer to the comments below.

Code

  # Include  <  Stdio. h  >  
# Include  <  Windows. h  > 
# Include  <  Iostream  >  

  Using     Namespace  STD;

  Int  Checkreg ()
{
Lpstr regeditstr  =     "  Software \ Microsoft \ Net Framework Setup \ NDP \ v3.5  " ;  //  Now we can determine if it is 3.5, but we are not sure if it is 3.5 SP1.  
  Hkey CK;  //  Registry Key  
    If  (Error_success  =  Regopenkeyex (HKEY_LOCAL_MACHINE, regeditstr,  0  , Key_all_access,  & CK ))  //  Check whether this key value exists in the registry.  
  {
Regclosekey (CK );  //  Disable Registry  
  Cout  <  "  He installed. net3.5 in his system. You can run your installation package.  "  <  Endl;
  Return    1  ;
}
  Else  
{
Cout  <  "  He hasn't installed. net3.5 in his system. Now start to install it!  "  <  Endl;
  Return     0  ;
}
}

  Int Startexe (lpstr path)
{
Startupinfo stinfo;  //  When a new process is created, the relevant members of the structure will be used.  
  Zeromemory ((  Void  *  )  &  Stinfo,  Sizeof  (Startupinfo ));  //  Leave stinfo empty  
 Process_information processinfo;  //  Data Structure of Process Information  
  Stinfo. CB  =    Sizeof  (Startupinfo );  //  Number of bytes in the startupinfo Structure  
  Stinfo. dwflags  =  Startf_useshowwindow;  // Display window  
  Stinfo. wshowwindow  =  Sw_show;  //  This applicationProgramHow should the first overlapping window appear?  
    If  (  !  CreateProcess (path, path, null, null,  False  ,  0 , Null, null,  &  Stinfo,  &  Processinfo ))
{
  //  DWORD dwret = getlasterror ();  //  Startup failed to obtain abnormal values  
    Return     0  ;
}
  Else 
{
Waitforsingleobject (processinfo. hprocess, infinite );  //  Wait until the installation is complete. This method is blocking!  
    Return     1  ;
}
}

  Int  Startcheck ()
{
Lpstr snetfile  =    " C: \ Program Files \ netmeeting \ conf.exe  "  ;  //  Path of your. net installation package  
  Lpstr sexefile  =    "  C: \ Program Files \ google pinyin 2 \ googlepinyinsettingwizard.exe  "  ;  //  Path of your program  
   If  (Checkreg ())
{
Startexe (sexefile );
Cout  <  "  Installation Complete  "  <  Endl;
}
  Else  
{
Startexe (snetfile );
Startcheck ();
}
  Return     1  ;
}

 Int  Main (  Void  )
{
Startcheck ();
  Char  A;
CIN  >  A;
  Return     0  ;
}