高手请帮忙看一下
FUNCTION ulong ShellExecute(ulong hwnd,ref string lpOperation,ref string lpFile,ref string lpParameters,ref string lpDirectory,ulong nShowCmd) LIBRARY "shell32.dll"
string ls_operation='open',ls_filename='c:\windows\Bubbles.bmp',ls_par,ls_dir
long ll_hand=1,ls_show=0
ShellExecute(ll_hand,ref ls_operation,ref ls_filename,ref ls_par,ref ls_dir,ls_show)
不知道错在哪里?