Как скопировать самого себя, если программа запущена

← →
Andrey Klimov (2001-09-27 14:19) [3]

function NormalDir(const DirName: string): string;
begin
Result := DirName;
if (Result <> "") and
not (Result[Length(Result)] in [":", "\"]) then
begin
if (Length(Result) = 1) and (UpCase(Result[1]) in ["A".."Z"]) then
Result := Result + ":\"
else Result := Result + "\";
end;
end;

function HasAttr(const FileName: string; Attr: Integer): Boolean;
var
FileAttr: Integer;
begin
FileAttr := FileGetAttr(FileName);
Result := (FileAttr >= 0) and (FileAttr and Attr = Attr);
end;

function GetFileSize(const FileName: string): Int64;
var
Handle: THandle;
FindData: TWin32FindData;
begin
Handle := FindFirstFile(PChar(FileName), FindData);
if Handle <> INVALID_HANDLE_VALUE then begin
Windows.FindClose(Handle);
if (FindData.dwFileAttributes and FILE_ATTRIBUTE_DIRECTORY) = 0 then
begin
Int64Rec(Result).Lo := FindData.nFileSizeLow;
Int64Rec(Result).Hi := FindData.nFileSizeHigh;
Exit;
end;
end;
Result := -1;
end;

procedure CopyFileEx(const FileName, DestName: string; OverwriteReadOnly, ShellDialog: Boolean);
var
CopyBuffer: Pointer;
Source, Dest: Integer;
Destination: TFileName;
BytesCopied: Longint;
Attr: Integer;
const
ChunkSize: Longint = 8192;
begin
Destination := DestName;
if HasAttr(Destination, faDirectory) then
Destination := NormalDir(Destination) + ExtractFileName(FileName);
GetMem(CopyBuffer, ChunkSize);
try
Source := FileOpen(FileName, fmShareDenyWrite);
if Source < 0 then
raise EFOpenError.CreateFmt(ResStr(SFOpenError), [FileName]);
try
ForceDirectories(ExtractFilePath(Destination));
if OverwriteReadOnly then begin
Attr := FileGetAttr(Destination);
if (Attr >= 0) and ((Attr and faReadOnly) <> 0) then
FileSetAttr(Destination, Attr and not faReadOnly);
end;
Dest := FileCreate(Destination);
if Dest < 0 then
raise EFCreateError.CreateFmt(ResStr(SFCreateError), [Destination]);
try
repeat
BytesCopied := FileRead(Source, CopyBuffer^, ChunkSize);
if BytesCopied = -1 then
raise EReadError.Create(ResStr(SReadError));
if BytesCopied > 0 then begin
if FileWrite(Dest, CopyBuffer^, BytesCopied) = -1 then
raise EWriteError.Create(ResStr(SWriteError));
end;
until BytesCopied < ChunkSize;
FileSetDate(Dest, FileGetDate(Source));
finally
FileClose(Dest);
end;
finally
FileClose(Source);
end;
finally
FreeMem(CopyBuffer, ChunkSize);
end;
end;

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