IShellFolder
我使用 windows shell 枚举控制面板中的项目并在 memo 中添加项目名称,最终发布PITEMIDLIST
但得到错误。
代码 :
procedure TForm1.Button1Click(Sender: TObject);
var
psfDeskTop : IShellFolder;
psfControl : IShellFolder;
pidControl : PITEMIDLIST;
pidChild : PITEMIDLIST;
pidAbsolute : PItemIdList;
pEnumList : IEnumIDList;
celtFetched : ULONG;
FileInfo : SHFILEINFOW;
begin
OleCheck(SHGetDesktopFolder(psfDeskTop));
OleCheck(SHGetSpecialFolderLocation(0, CSIDL_CONTROLS, pidControl));
OleCheck(psfDeskTop.BindToObject(pidControl, nil, IID_IShellFolder,
psfControl));
OleCheck(psfControl.EnumObjects(0, SHCONTF_NONFOLDERS or SHCONTF_INCLUDEHIDDEN
or SHCONTF_FOLDERS, pEnumList));
while pEnumList.Next(1, pidChild, celtFetched) = 0 do
begin
pidAbsolute := ILCombine(pidControl, pidChild);
SHGetFileInfo(LPCTSTR(pidAbsolute), 0, FileInfo, SizeOf(FileInfo),
SHGFI_PIDL or SHGFI_DISPLAYNAME);
Memo1.Lines.Add(FileInfo.szDisplayName);
end;
//OK
psfDeskTop._Release;
//Error
psfControl._Release;
//Error
//pEnumList._Release;
CoTaskMemFree(pidControl);
CoTaskMemFree(pidChild);
CoTaskMemFree(pidAbsolute);
end;
为什么可以发布psfDeskTop
但发布时出错psfControl and pEnumList
?有没有其他方法可以释放它们?还是在释放它们之前我需要一些判断?