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Fun3 := GetProcAddress(FHandle,'CloseCommPort')
if Assigned(Fun3) then

Assigned(Fun3)·µ»ØÎªfalse
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TFun1=function(lpszPortNum: LPCSTR;dwBaudRate: DWORD): DWORD; stdcall;
  TFun2=procedure(hCom: Thandle); stdcall;
  TFun3=function(DevNo: LPCSTR;var pAbout: LPSTR): DWORD ; stdcall;

Var FHandle: THandle;
    Fun1: TFun1; //´ò¿ª¶Ë¿Ú
    Fun2: TFun3; //¶ÁÈ¡°æ±¾ÐÅÏ¢
    Fun3: TFun2; //¹Ø±Õ¶Ë¿Ú
    DevNo: LPCSTR;
    pAbout: LPSTR;
begin
  FHandle :=  LoadLibrary('168netcom.dll');
  try
    if FHandle>0 then
    begin
      Fun1 := GetProcAddress(FHandle,'OpenCommPort'); //´ò¿ª¶Ë¿Ú
      if Assigned(Fun1) t


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