Thanks, following your advice finally the script started working.
Here is the changed script:


" Last Change: 2014-05-22  Thursday: 04:16:18 PM
" -----------------------Implementation of a simple feature
" -----------------------"Find in Files and Directories"
" -----------------------like Notepad++ -----------------
" -----------------------Created & Edited by Pinaki Sekhar Gupta
<[email protected]>------------------------
" -----------------------Licence: No licence is better than
everything-------------------------------------------



:menu Edit.Find\ in\ Files  :<Esc>:<Esc>:call Find_in_Files() <Cr>

function Find_in_Files()

" -----------------------raw method-----------------
" :vimgrep /GNU/ C:\CodeBlocks\TDM-GCC-64\include\*.txt
" :cw
" --------------------------------------------------

        let what2find = inputdialog("search term", "", "cancel pressed")
        let     directory       = browsedir("Browse the directory","")
        let filetype = inputdialog("filetype", "", "cancel pressed")
        let forwardslash = "/"
        let space = " "
        let wildcard = "*."
    if what2find != "" && what2find != "cancel pressed" && directory !=  ""
&& filetype !=  ""

                    "          port to test whether the nested strings are
working or not
                    "
http://vim.1045645.n5.nabble.com/How-can-I-pass-user-input-value-to-vimgrep-td5721661.html
                    " :echom "Hello, " . "world"
                    " Hello, world "
http://learnvimscriptthehardway.stevelosh.com/chapters/26.html
                    " echo forwardslash . what2find . forwardslash . space .
directory . wildcard . filetype

        :execute "vimgrep /" . what2find . forwardslash . space .
fnameescape(directory) . wildcard . fnameescape(filetype)
        :cw

    else
        " process if user press okay
        if what2find != "cancel pressed" && directory !=  "cancel pressed"
&& filetype !=  "cancel pressed"

            :execute "vimgrep /" . what2find . forwardslash . space .
fnameescape(directory) . wildcard . fnameescape(filetype)
            :cw

        endif
    endif
endfunction











If you still have any improvement suggestion please inform..





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