HOW TO DELETE FILE TO RECYCLE BIN USING WIN32API

Posted by obondar
on Sunday, October 28

In current project there is situation when file should not be just deleted but deleted to Recycle Bin. It is possible to do this by executing SHFileOperation. The main problem is how to do this from ruby. This example shows how to execute external method with passing structure as a parameter. 

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require 'dl/import'
require 'dl/struct'
module User32
      extend DL::Importable
    
      typealias "BOOL", "int"
      typealias "UINT", "unsigned int"
      typealias "PVOID", "void *"
      typealias "LONG", "long"
      typealias "HWND", "void *"
      typealias "LPCTSTR", "char *"
      typealias "LPVOID", "void *"
      typealias "LPCTSTR", "char *"
      typealias "FILEOP_FLAGS", "long"
    
    SHFileOperation = struct [
    "HWND hwnd",
    "UINT wFunc",
    "LPCTSTR pFrom",
    "LPCTSTR pTo",
    "FILEOP_FLAGS fFlags",
    "BOOL fAnyOperationsAborted",
    "LPVOID hNameMappings",
    "LPCTSTR lpszProgressTitle"
    ]
    
    dlload "shell32.dll"
    extern "BOOL SHFileOperation(PVOID)"

        FO_DELETE          = 3;
        FOF_ALLOWUNDO      = 64;
        FOF_NOCONFIRMATION = 16;
        
    def self.trash_file(file)
                file_info = User32::SHFileOperation::malloc
                file_info.wFunc = FO_DELETE
                file_info.pFrom = file
                file_info.pTo = file
                file_info.fFlags = FOF_ALLOWUNDO | FOF_NOCONFIRMATION
                file_info.wFunc = FO_DELETE
                puts file_info.pFrom
                if File.readable?(file)
                        sHFileOperation(file_info.to_ptr)
                end
        end
end