关键接口函数:
function RAROpenArchive(var ArchiveData: RAROpenArchiveData): THandle;
stdcall; external _unrar;
function RAROpenArchiveEx(var ArchiveData: RAROpenArchiveDataEx): THandle;
stdcall; external _unrar;
function RARCloseArchive(hArcData: THandle): Integer;
stdcall; external _unrar;
function RARReadHeader(hArcData: THandle; var HeaderData: RARHeaderData): Integer;
stdcall; external _unrar;
function RARReadHeaderEx(hArcData: THandle; var HeaderData: RARHeaderDataEx): Integer;
stdcall; external _unrar;
function RARProcessFile(hArcData: THandle; Operation: Integer; DestPath, DestName: PChar): Integer;
stdcall; external _unrar;
procedure RARSetCallback(hArcData: THandle; UnrarCallback: TUnrarCallback; UserData: Integer);
stdcall; external _unrar;
procedure RARSetPassword(hArcData: THandle; Password: PChar);
stdcall; external _unrar;
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