Windows.CopyFile verhält sich verkehrt!

[PeterPanino]

Ich hab mal diese Liste hier irgendwo gefunden. Kann jemand 'ne Aussage machen, welche Vor- und Nachteile die einzelnen Methoden jeweils haben?

Delphi-Quellcode:

// There are five methods to copy a file, you can chose one to use:

// No 1: 
Procedure FileCopy( Const sourcefilename, targetfilename: String ); 
Var 
  S, T: TFileStream; 
Begin 
  S := TFileStream.Create( sourcefilename, fmOpenRead ); 
  try 
    T := TFileStream.Create( targetfilename, fmOpenWrite or fmCreate ); 
    try 
      T.CopyFrom(S, S.Size ) ; 
    finally 
      T.Free; 
    end; 
  finally 
    S.Free; 
  end; 
End; 

// No 2:
{This way uses memory blocks for read/write.} 
procedure FileCopy(const FromFile, ToFile: string); 
var 
  FromF, ToF: file; 
  NumRead, NumWritten: Word; 
  Buf: array[1..2048] of Char; 
begin 
  AssignFile(FromF, FromFile); 
  Reset(FromF, 1);        { Record size = 1 } 
  AssignFile(ToF, ToFile);    { Open output file } 
  Rewrite(ToF, 1);        { Record size = 1 } 
  repeat 
    BlockRead(FromF, Buf, SizeOf(Buf), NumRead); 
    BlockWrite(ToF, Buf, NumRead, NumWritten); 
  until (NumRead = 0) or (NumWritten <> NumRead); 
  System.CloseFile(FromF); 

  System.CloseFile(ToF); 
end; 

// No 3. 
{This one uses LZCopy, which USES LZExpand.} 
procedure CopyFile(FromFileName, ToFileName: string); 
var 
  FromFile, ToFile: File; 
begin 
  AssignFile(FromFile, FromFileName); { Assign FromFile to FromFileName } 
  AssignFile(ToFile, ToFileName);     { Assign ToFile to ToFileName } 
  Reset(FromFile);                    { Open file for input } 
  try 
    Rewrite(ToFile);                  { Create file for output } 
    try 

      { copy the file an if a negative value is returned raise an exception } 
      if LZCopy(TFileRec(FromFile).Handle, TFileRec(ToFile).Handle) < 0 then 
        raise Exception.Create('Error using LZCopy') 
    finally 
      CloseFile(ToFile);  { Close ToFile } 
    end; 
  finally 
    CloseFile(FromFile);  { Close FromFile } 
  end; 
end; 

// No 4: 
procedure CopyFile(FromFileName, ToFileName: string); 
var 
  shellinfo: TSHFileOpStructA; 
  Files:String; 
begin 
  Files:=FromFileName+#0+#0; 
  with shellinfo do 
  begin 
    Wnd:=Self.handle; 
    wFunc:=FO_COPY; 
    pFrom:=PChar(Files); 
    pTo:=PChar(ToFileName); 
    fFlags:=FOF_NOCONFIRMATION or FOF_SILENT; 
  end; 
  SHFileOperation(shellinfo); 
end; 

// No 5: 
copyfile(PChar(FromFileName),PChar(ToFileName),False);