判断文件是否使用中 Checking If File Is In Use

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Checking If File Is In Use From Zarko Gajic, Your Guide to Delphi Programming. FREE Newsletter. Sign up now! IsFileInUse will return true if the file is locked for exclusive access. It would fail if the file doesn't exist at all. ~~~~~~~~~~~~~~~~~~~~~~~~~ function IsFileInUse(fName : string) : boolean; var     HFileRes : HFILE; begin     Result := false;     if not FileExists(fName) then exit;     HFileRes :=       CreateFile(pchar(fName),                  GENERIC_READ or GENERIC_WRITE,                  0, nil, OPEN_EXISTING,                  FILE_ATTRIBUTE_NORMAL,                  0) ;     Result := (HFileRes = INVALID_HANDLE_VALUE) ;     if not Result then     CloseHandle ~~~~~~~~~~~~~~~~~~~~~~~~~ Delphi tips navigator: » Capture Maximize/Minimize Buttons « Rotating text

uses wininet

 

if not InternetCheckConnection(PChar(CUrl), 1, 0) then
  Begin
    ShowMessage('网路不通!');
    Exit;
  End;