done.

> About identical check of new and existing file in builder.
> 
> Currently there is a limit of file size defined by "bufferLength".
> When the file size exceed the size, the file will be always overwritten by builder.
> And if the file is existing task cpp file, user will lose a part of his code.
> 
> Actually, LPConfig.cpp is larger than that.
> 
> So I wrote a simple function. it will be called recursively when the file is larger than buffer.
> bufferLength is not necessary to be so large.
> 
> bool checkIdentical(const int fileHandle,const char* pattern,bool flag=true)
> {
>    static int position
>    int  i;
>    char fileBuffer[bufferLength];
> 
>    if(flag)
>       position = 0;
> 
>    int nb = read(fileHandle,&fileBuffer, sizeof(fileBuffer));
>   
>    if(nb == bufferLength){
>       if((int)strlen(pattern)-position < bufferLength)
>          return false;
>      
>       for (i=0;i<nb;i++)
>          if (pattern[position+i] != fileBuffer[i])
>             return false;     
>       position += bufferLength;
>       return checkIdentical(fileHandle,pattern,false);
>    }  
>    else{
>       if (nb != (int)strlen(pattern) - position)
>          return false;
>      
>       for (i=0;i<nb;i++)
>          if (pattern[position+i] != fileBuffer[i])
>             return false;
>    }
>    return true;
> }
> 
> 
> You may use this function in builder like,
>    int fileHandle = open("test.txt",O_RDONLY);
>    bool identical = checkIdentical(fileHandle,buffer);
>    close(fileHandle);
> 
> And there is another way. TString can read file. this featrue can be used when you read existing Task cpp file.
> 
>    ifstream ifile("test.txt");
>    TString fileBuffer;
>    str.ReadFile(ifile);
>    bool identical = ( fileBuffer == buffer );