349 lines
10 KiB
C
349 lines
10 KiB
C
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#include "shellprv.h"
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#pragma hdrstop
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// warning: this will fail given a UNICODE hDrop on an ANSI build and
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// the DRAGINFO is esentially a TCHAR struct with no A/W versions exported
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//
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// in:
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// hDrop drop handle
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//
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// out:
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// a bunch of info about the hdrop
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// (mostly the pointer to the double NULL file name list in TCHAR format)
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//
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// returns:
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// TRUE the DRAGINFO struct was filled in
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// FALSE the hDrop was bad
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//
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STDAPI_(BOOL) DragQueryInfo(HDROP hDrop, DRAGINFO *pdi)
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{
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if (hDrop && (pdi->uSize == sizeof(DRAGINFO)))
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{
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LPDROPFILES lpdfx = (LPDROPFILES)GlobalLock((HGLOBAL)hDrop);
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pdi->lpFileList = NULL;
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if (lpdfx)
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{
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LPTSTR lpOldFileList;
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if (LOWORD(lpdfx->pFiles) == sizeof(DROPFILES16))
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{
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//
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// This is Win31-stye HDROP
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//
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LPDROPFILES16 pdf16 = (LPDROPFILES16)lpdfx;
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pdi->pt.x = pdf16->pt.x;
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pdi->pt.y = pdf16->pt.y;
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pdi->fNC = pdf16->fNC;
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pdi->grfKeyState = 0;
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lpOldFileList = (LPTSTR)((LPBYTE)pdf16 + pdf16->pFiles);
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}
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else
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{
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//
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// This is a new (NT-compatible) HDROP.
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//
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pdi->pt.x = lpdfx->pt.x;
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pdi->pt.y = lpdfx->pt.y;
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pdi->fNC = lpdfx->fNC;
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pdi->grfKeyState = 0;
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lpOldFileList = (LPTSTR)((LPBYTE)lpdfx + lpdfx->pFiles);
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// there could be other data in there, but all
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// the HDROPs we build should be this size
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ASSERT(lpdfx->pFiles == sizeof(DROPFILES));
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}
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{
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BOOL fListMatchesBuild;
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if ((LOWORD(lpdfx->pFiles) == sizeof(DROPFILES16)) || lpdfx->fWide == FALSE)
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{
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fListMatchesBuild = FALSE;
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}
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else
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{
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fListMatchesBuild = TRUE;
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}
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if (fListMatchesBuild)
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{
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LPTSTR pTStr = (LPTSTR) lpOldFileList;
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LPTSTR pNewFileList;
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UINT cChar;
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// Look for the end of the file list
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while (*pTStr || *(pTStr + 1))
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{
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pTStr++;
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}
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pTStr++; // Advance to last NUL of double terminator
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cChar = (UINT)(pTStr - lpOldFileList);
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pNewFileList = (LPTSTR) SHAlloc((cChar + 1) * sizeof(TCHAR));
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if (NULL == pNewFileList)
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{
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GlobalUnlock((HGLOBAL)hDrop);
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return FALSE;
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}
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// Copy strings to new buffer and set LPDROPINFO filelist
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// pointer to point to this new buffer
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CopyMemory(pNewFileList, lpOldFileList, ((cChar + 1) * sizeof(TCHAR)));
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pdi->lpFileList = pNewFileList;
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}
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else
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{
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LPXSTR pXStr = (LPXSTR) lpOldFileList;
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LPTSTR pNewFileList;
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LPTSTR pSaveFileList;
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UINT cChar;
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UINT cchConverted;
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// Look for the end of the file list
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while (*pXStr || (*(pXStr + 1)))
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{
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pXStr++;
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}
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pXStr++; // Advance to the last NUL of the double terminator
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cChar = (UINT)(pXStr - ((LPXSTR) lpOldFileList));
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pNewFileList = (LPTSTR) SHAlloc((cChar + 1) * sizeof(TCHAR));
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if (NULL == pNewFileList)
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{
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GlobalUnlock((HGLOBAL)hDrop);
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return FALSE;
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}
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pSaveFileList = pNewFileList;
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pXStr = (LPXSTR) lpOldFileList;
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do
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{
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cchConverted = MultiByteToWideChar(CP_ACP, 0, pXStr, -1,
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pNewFileList, ((cChar + 1) * sizeof(TCHAR))); // Not really, but... "trust me"
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if (0 == cchConverted)
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{
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ASSERT(0 && "Unable to convert HDROP filename ANSI -> UNICODE");
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GlobalUnlock((HGLOBAL)hDrop);
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SHFree(pSaveFileList);
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return FALSE;
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}
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pNewFileList += cchConverted;
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pXStr += lstrlenX(pXStr) + 1;
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} while (*pXStr);
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// Add the double-null-terminator to the output list
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*pNewFileList = 0;
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pdi->lpFileList = pSaveFileList;
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}
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}
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GlobalUnlock((HGLOBAL)hDrop);
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return TRUE;
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}
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}
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return FALSE;
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}
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// 3.1 API
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STDAPI_(BOOL) DragQueryPoint(HDROP hDrop, POINT *ppt)
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{
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BOOL fRet = FALSE;
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LPDROPFILES lpdfs = (LPDROPFILES)GlobalLock((HGLOBAL)hDrop);
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if (lpdfs)
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{
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if (LOWORD(lpdfs->pFiles) == sizeof(DROPFILES16))
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{
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//
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// This is Win31-stye HDROP
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//
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LPDROPFILES16 pdf16 = (LPDROPFILES16)lpdfs;
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ppt->x = pdf16->pt.x;
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ppt->y = pdf16->pt.y;
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fRet = !pdf16->fNC;
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}
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else
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{
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//
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// This is a new (NT-compatible) HDROP
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//
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ppt->x = (UINT)lpdfs->pt.x;
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ppt->y = (UINT)lpdfs->pt.y;
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fRet = !lpdfs->fNC;
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// there could be other data in there, but all
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// the HDROPs we build should be this size
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ASSERT(lpdfs->pFiles == sizeof(DROPFILES));
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}
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GlobalUnlock((HGLOBAL)hDrop);
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}
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return fRet;
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}
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//
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// Unfortunately we need it split out this way because WOW needs to
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// able to call a function named DragQueryFileAorW (so it can shorten them)
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//
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STDAPI_(UINT) DragQueryFileAorW(HDROP hDrop, UINT iFile, void *lpFile, UINT cb, BOOL fNeedAnsi, BOOL fShorten)
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{
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UINT i;
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LPDROPFILESTRUCT lpdfs = (LPDROPFILESTRUCT)GlobalLock(hDrop);
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if (lpdfs)
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{
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// see if it is the new format
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BOOL fWide = LOWORD(lpdfs->pFiles) == sizeof(DROPFILES) && lpdfs->fWide;
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if (fWide)
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{
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LPWSTR lpList;
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WCHAR szPath[MAX_PATH];
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//
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// UNICODE HDROP
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//
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lpList = (LPWSTR)((LPBYTE)lpdfs + lpdfs->pFiles);
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// find either the number of files or the start of the file
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// we're looking for
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//
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for (i = 0; (iFile == (UINT)-1 || i != iFile) && *lpList; i++)
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{
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while (*lpList++)
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;
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}
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if (iFile == (UINT)-1)
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goto Exit;
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iFile = i = lstrlenW(lpList);
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if (fShorten && iFile < MAX_PATH)
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{
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wcscpy(szPath, lpList);
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SheShortenPathW(szPath, TRUE);
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lpList = szPath;
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iFile = i = lstrlenW(lpList);
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}
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if (fNeedAnsi)
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{
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// Do not assume that a count of characters == a count of bytes
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i = WideCharToMultiByte(CP_ACP, 0, lpList, -1, NULL, 0, NULL, NULL);
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iFile = i ? --i : i;
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}
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if (!i || !cb || !lpFile)
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goto Exit;
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if (fNeedAnsi)
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{
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SHUnicodeToAnsi(lpList, (LPSTR)lpFile, cb);
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}
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else
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{
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cb--;
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if (cb < i)
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i = cb;
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lstrcpynW((LPWSTR)lpFile, lpList, i + 1);
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}
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}
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else
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{
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LPSTR lpList;
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CHAR szPath[MAX_PATH];
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//
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// This is Win31-style HDROP or an ANSI NT Style HDROP
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//
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lpList = (LPSTR)((LPBYTE)lpdfs + lpdfs->pFiles);
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// find either the number of files or the start of the file
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// we're looking for
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//
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for (i = 0; (iFile == (UINT)-1 || i != iFile) && *lpList; i++)
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{
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while (*lpList++)
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;
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}
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if (iFile == (UINT)-1)
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goto Exit;
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iFile = i = lstrlenA(lpList);
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if (fShorten && iFile < MAX_PATH)
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{
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strcpy(szPath, lpList);
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SheShortenPathA(szPath, TRUE);
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lpList = szPath;
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iFile = i = lstrlenA(lpList);
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}
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if (!fNeedAnsi)
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{
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i = MultiByteToWideChar(CP_ACP, 0, lpList, -1, NULL, 0);
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iFile = i ? --i : i;
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}
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if (!i || !cb || !lpFile)
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goto Exit;
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if (fNeedAnsi)
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{
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cb--;
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if (cb < i)
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i = cb;
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lstrcpynA((LPSTR)lpFile, lpList, i + 1);
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}
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else
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{
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SHAnsiToUnicode(lpList, (LPWSTR)lpFile, cb);
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}
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}
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}
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i = iFile;
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Exit:
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GlobalUnlock(hDrop);
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return i;
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}
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STDAPI_(UINT) DragQueryFileW(HDROP hDrop, UINT wFile, LPWSTR lpFile, UINT cb)
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{
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return DragQueryFileAorW(hDrop, wFile, lpFile, cb, FALSE, FALSE);
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}
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STDAPI_(UINT) DragQueryFileA(HDROP hDrop, UINT wFile, LPSTR lpFile, UINT cb)
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{
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return DragQueryFileAorW(hDrop, wFile, lpFile, cb, TRUE, FALSE);
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}
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STDAPI_(void) DragFinish(HDROP hDrop)
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{
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GlobalFree((HGLOBAL)hDrop);
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}
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STDAPI_(void) DragAcceptFiles(HWND hwnd, BOOL fAccept)
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{
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long exstyle = GetWindowLong(hwnd, GWL_EXSTYLE);
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if (fAccept)
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exstyle |= WS_EX_ACCEPTFILES;
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else
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exstyle &= (~WS_EX_ACCEPTFILES);
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SetWindowLong(hwnd, GWL_EXSTYLE, exstyle);
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}
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