delphi - 使用 ifileoperation copyitem 时提升 uac

Question

我在 Windows 7 中使用下面的代码进行文件复制操作，但它不起作用，并且在运行或调试时没有任何错误，当应用程序调用 CoGetObject 时，它会崩溃并且无法运行返回任何 Hresult 错误，我只知道错误发生在这一行 ->result := CoGetObject(pWideString(MonikerName), @BindOpts,
ShlObj.IFileOperation, @iFileOperation);任何人都可以在这段代码中发现任何问题吗？ `

type  PBindOpts3 = ^TBindOpts3;{$EXTERNALSYM tagBIND_OPTS3}  tagBIND_OPTS3 = record    cbStruct: DWORD;    grfFlags: DWORD;    grfMode: DWORD;    dwTickCountDeadline: DWORD;    dwTrackFlags: DWORD;    dwClassContext: DWORD;    locale: LCID;    pServerInfo: Pointer;     hwnd: hwnd;  end;  TBindOpts3 = tagBIND_OPTS3;{$EXTERNALSYM BIND_OPTS3}  BIND_OPTS3 = TBindOpts3;
function CopyItem(const aSrcItem, aDest, aNewName: string): HResult;const  CLSID_FileOp: TGUID = '{3ad05575-8857-4850-9277-11b85bdb8e09}';
var  lFileOperation: ShlObj.IFileOperation;  psiFrom: IShellItem;  psiTo: IShellItem;  myFile: TextFile;  BindOpts: TBindOpts3;  MonikerName: WideString;  Res: HResult;
begin  try
begin
结果 := CoInitialize(nil);      如果成功(结果)则      开始
 
    ZeroMemory(@BindOpts, Sizeof(TBindOpts3));
    BindOpts.cbStruct := Sizeof(TBindOpts3);
    BindOpts.hwnd := 0;
    BindOpts.dwClassContext := CLSCTX_LOCAL_SERVER;

    MonikerName := 'Elevation:Administrator!new:' + GUIDToString
      (CLSID_FileOp);
    result := CoGetObject(pWideString(MonikerName), @BindOpts,
      ShlObj.IFileOperation, @lFileOperation);

    if Succeeded(result) then

      result := CoCreateInstance(CLSID_FileOp, nil,
        CLSCTX_LOCAL_SERVER + CLSCTX_INPROC_SERVER + CLSCTX_INPROC_HANDLER,
        IFileOperation, lFileOperation);
    if Succeeded(result) then
    begin
      result := lFileOperation.SetOperationFlags
        (FOFX_SHOWELEVATIONPROMPT + FOFX_NOCOPYHOOKS +
          FOFX_REQUIREELEVATION); 
      if Succeeded(result) then
      begin
        result := SHCreateItemFromParsingName
          (pchar(aSrcItem), nil, IShellItem, psiFrom);
        if Succeeded(result) then
        begin
          if aDest <> '' then
          begin

            result := SHCreateItemFromParsingName
              (pchar(aDest), nil, IShellItem, psiTo);
          end;

          if Succeeded(result) then
          begin

            result := lFileOperation.CopyItem
              (psiFrom, psiTo, pchar(aNewName), nil);

            psiTo := nil;
          end;

          psiFrom := nil;
        end;

        if Succeeded(result) then
        begin

          result := lFileOperation.PerformOperations;
        end;
      end;

      lFileOperation := nil;
    end;

    CoUninitialize;
  end;
end;
除了    on d: 异常(exception)    开始
 
 showmessage(d.tostring());
end;
结束；
结束；

`

Answer 1

CoGetObject() 实际返回什么 HRESULT 值？

调用 COM 函数时，不要将 WideString 强制转换为 pWideString。按原样传递它，让 Delphi 为您处理编码细节。

并且调用CoGetObject()之后不需要再调用CoCreateInstance()。 CoGetObject() 已将所需的 COM 对象返回给您。按原样使用它。

试试这个:

function CopyItem(const aSrcItem, aDest, aNewName: string): HResult;
const
  CLSID_FileOp: TGUID = '{3ad05575-8857-4850-9277-11b85bdb8e09}';
var
  lFileOperation: ShlObj.IFileOperation;
  psiFrom: IShellItem;
  psiTo: IShellItem;
  BindOpts: TBindOpts3;
  MonikerName: WideString;
begin
  try
    Result := CoInitialize(nil);
    OleCheck(Result);
    try
      ZeroMemory(@BindOpts, Sizeof(TBindOpts3)); 
      BindOpts.cbStruct := Sizeof(TBindOpts3); 
      BindOpts.hwnd := 0; 
      BindOpts.dwClassContext := CLSCTX_LOCAL_SERVER; 

      MonikerName := 'Elevation:Administrator!new:' + GUIDToString(CLSID_FileOp); 
      Result := CoGetObject(MonikerName, @BindOpts, ShlObj.IFileOperation, lFileOperation); 
      OleCheck(Result);

      Result := lFileOperation.SetOperationFlags(FOFX_SHOWELEVATIONPROMPT or FOFX_NOCOPYHOOKS or FOFX_REQUIREELEVATION);  
      OleCheck(Result);

      Result := SHCreateItemFromParsingName(PChar(aSrcItem), nil, IShellItem, psiFrom); 
      OleCheck(Result);

      if aDest <> '' then 
      begin 
        Result := SHCreateItemFromParsingName(PChar(aDest), nil, IShellItem, psiTo); 
        OleCheck(Result);
      end; 

      Result := lFileOperation.CopyItem(psiFrom, psiTo, PChar(aNewName), nil); 
      OleCheck(Result);

      Result := lFileOperation.PerformOperations;
      OleCheck(Result);
    finally 
      CoUninitialize; 
    end; 
  except
    on E: Exception do ShowMessage(d.ToString());
  end;
end;