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javacshelljna

JNA map Java String to PCWSTR

SHSTDAPI SHCreateItemFromParsingName(
  PCWSTR   pszPath,
  IBindCtx *pbc,
  REFIID   riid,
  void     **ppv
);

I tried to map the above method to this method:

WinNT.HRESULT SHCreateItemFromParsingName(String pszPath, Pointer p, Guid.REFIID riid, PointerByReference ppv);

EDIT:

PointerByReference ppv = new PointerByReference();

        Guid.REFIID rid = new Guid.REFIID(new Guid.IID(Shell32Extra.IID_IShellItem));

        WinNT.HRESULT h = Shell32Extra.INSTANCE.SHCreateItemFromParsingName("*.txt",null,rid,ppv);

        IShellItem shellItem = new IShellItem(ppv.getValue());

But the HRESULT throws failed with -2147024894

And if pbc is not null, it will throw an Memory access expection

What should I change? I think it maybe is failing because of the PCWSTR mapping.

Solution

  • While technomage points out mapping errors, these wouldn't be giving you the result you got. The HRESULT of -2147024894 indicates the system can't find the file. Your dd.txt file is not in the path that the program has access to.

    Additionally you can use the WString type to specify that you need a wide string. Wrap your dd.txt (or longer path) in a WString constructor and pass that.