dll/shellext/fontext/CDataObject.cpp

   1 /*
   2  * PROJECT:     ReactOS Font Shell Extension
   3  * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
   4  * PURPOSE:     CFontMenu implementation
   5  * COPYRIGHT:   Copyright 2019-2021 Mark Jansen <mark.jansen@reactos.org>
   6  */
   7
   8 #include "precomp.h"
   9
  10 WINE_DEFAULT_DEBUG_CHANNEL(fontext);
  11
  12
  13 #if 0
  14 static inline void DumpDataObjectFormats(IDataObject* pObject)
  15 {
  16     CComPtr<IEnumFORMATETC> pEnumFmt;
  17     HRESULT hr = pObject->EnumFormatEtc(DATADIR_GET, &pEnumFmt);
  18
  19     if (FAILED_UNEXPECTEDLY(hr))
  20         return;
  21
  22     FORMATETC fmt;
  23     while (S_OK == pEnumFmt->Next(1, &fmt, NULL))
  24     {
  25         char szBuf[512];
  26         GetClipboardFormatNameA(fmt.cfFormat, szBuf, sizeof(szBuf));
  27         ERR("Format: %s\n", szBuf);
  28         ERR("Tymed: %u\n", fmt.tymed);
  29         if (fmt.tymed & TYMED_HGLOBAL)
  30         {
  31             ERR("TYMED_HGLOBAL supported\n");
  32         }
  33     }
  34 }
  35 #endif
  36
  37
  38 HRESULT _CDataObject_CreateInstance(PCIDLIST_ABSOLUTE folder, UINT cidl, PCUITEMID_CHILD_ARRAY apidl,
  39                                     REFIID riid, LPVOID* ppvOut)
  40 {
  41     HRESULT hr = CIDLData_CreateFromIDArray(folder, cidl, apidl, (IDataObject**)ppvOut);
  42     if (FAILED_UNEXPECTEDLY(hr))
  43         return hr;
  44
  45     // Now that we have an IDataObject with the shell itemid list (CFSTR_SHELLIDLIST, aka HIDA) format
  46     // we will augment this IDataObject with the CF_HDROP format. (Full filepaths)
  47     // This enabled the objects for the 'copy' and drag to copy actions
  48
  49     CComHeapPtr<BYTE> data;
  50
  51     // First we allocate room for the DROPFILES structure
  52     data.AllocateBytes(sizeof(DROPFILES));
  53     UINT offset = sizeof(DROPFILES);
  54
  55     // Then we walk all files
  56     for (UINT n = 0; n < cidl; ++n)
  57     {
  58         const FontPidlEntry* fontEntry = _FontFromIL(apidl[n]);
  59         if (fontEntry)
  60         {
  61             CStringW File = g_FontCache->Filename(g_FontCache->Find(fontEntry), true);
  62             if (!File.IsEmpty())
  63             {
  64                 // Now append the path (+ nullterminator) to the buffer
  65                 UINT len = offset + (File.GetLength() + 1) * sizeof(WCHAR);
  66                 data.ReallocateBytes(len);
  67                 if (!data)
  68                 {
  69                     ERR("Unable to allocate memory for the CF_HDROP\n");
  70                     return hr;
  71                 }
  72                 BYTE* dataPtr = data;
  73                 StringCbCopyW((STRSAFE_LPWSTR)(dataPtr + offset), len - offset, File);
  74                 offset = len;
  75             }
  76             else
  77             {
  78                 ERR("No file found for %S\n", fontEntry->Name);
  79             }
  80         }
  81     }
  82
  83     // Append the final nullterminator (double null terminated list)
  84     data.ReallocateBytes(offset + sizeof(UNICODE_NULL));
  85     LPWSTR str = (LPWSTR)((BYTE*)data + offset);
  86     *str = UNICODE_NULL;
  87     offset += sizeof(UNICODE_NULL);
  88
  89     // Fill in the required fields
  90     DROPFILES* pDrop = (DROPFILES*)(BYTE*)data;
  91     pDrop->fWide = 1;
  92     pDrop->pFiles = sizeof(DROPFILES);
  93     // Zero out the rest
  94     pDrop->pt.x = pDrop->pt.y = 0;
  95     pDrop-> fNC = NULL;
  96
  97     hr = DataObject_SetData(*(IDataObject**)ppvOut, CF_HDROP, data, offset);
  98     FAILED_UNEXPECTEDLY(hr);
  99
 100     return hr;
 101 }
 102