delphi - incompatible types pwidechar and string ShellExecute -

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i try compress files using winrar command line, when add variable in command line these error incompatible types 'pwidechar' , 'string' !

i convert sdate variable widechar it's not work !!

how can fix !

procedure tform1.button1click(sender: tobject); var mydate : tdatetime; sdate : string; begin mydate:= now-7; sdate := formatdatetime('yyyy/mm/dd',mydate);   shellexecute(0, 'open', pchar('c:\program files\winrar\winrar.exe'),     'a -r -ta'+ pchar(sdate) +' d:\xlsfiles.rar d:\*.xls*', nil, sw_show); end;

the text arguments of shellexecute of type pchar. supply string argument number 4.

the error message clear. know inspecting declaration of shellexecute problematic argument of type pchar (an alias pwidechar). , error message tells you passing string.

instead of

'a -r -ta'+ pchar(sdate) +' d:\xlsfiles.rar d:\*.xls*'

pass

pchar('a -r -ta'+ sdate +' d:\xlsfiles.rar d:\*.xls*')

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