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                            VisualBasic提供了过时的FileCopy语句.问题是使用该函数时并不显示文件复制对话框,也就是说,当拷贝一个大文件时,用户看不到Windows的标准
  文件复制对话框,无法从进度条上判断当前复制的进度.那么,如何做到这一点呢?请看下面:  
  PublicTypeSHFILEOPSTRUCT
  hWndAsLong
  wFuncAsLong
  pFromAsString
  pToAsString
  fFlagsAsInteger
  fAnyOperationsAbortedAsBoolean
  hNameMappingsAsLong
  lpszProgressTitleAsString
  EndType  
  PublicDeclareFunctionSHFileOperationLib"shell32.dll"Alias
  _
  "SHFileOperationA"(lpFileOpAsSHFILEOPSTRUCT)AsLong
  PublicConstFO_COPY=&H2
  PublicConstFOF_ALLOWUNDO=&H40  
  PublicSubShellCopyFile(SourceAsString,DestAsString)
  DimresultAsLong
  DimfileopAsSHFILEOPSTRUCT
  Withfileop
  .hwnd=0
  .wFunc=FO_COPY
  'ThefilestocopyseparatedbyNullsandterminatedby2nulls
  .pFrom=Source&vbNullChar&vbNullChar
  'ortocopyallfilesusethisline
  '.pFrom="C:*.*"&vbNullChar&vbNullChar
  'Thedirectoryorfilename(s)tocopyintoterminatedin2nulls
  .pTo=Dest&vbNullChar&vbNullChar
  .fFlags=FOF_ALLOWUNDO
  EndWith
  result=SHFileOperation(fileop)
  Ifresult<>0Then'Operationfailed
  'MsgboxtheerrorthatoccurredintheAPI.
  MsgBoxErr.LastDllError,vbCriticalOrvbOKOnly
  Else
  Iffileop.fAnyOperationsAborted<>0Then
  MsgBox"OperationFailed",vbCriticalOrvbOKOnly
  EndIf
  EndIf
  EndSub  
  只需调用ShellCopyFileFileA,FileACopy->