Source code of Windows XP (NT5)
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#include "shellprv.h"
#pragma hdrstop
// Must have access to:
// IID_IPrinterFolder & IID_IFolderNotify interfaces
// declared in windows\inc\winprtp.h
//
#include <initguid.h>
#include <winprtp.h>
#include "w32utils.h"
#include "dpa.h"
#include <msprintx.h>
#include "ids.h"
#include "printer.h"
#include "copy.h"
#include "fstreex.h"
#include "datautil.h"
#include "infotip.h"
#include "idldrop.h"
#include "ovrlaymn.h"
#include "netview.h"
#include "prnfldr.h"
// thread data param
typedef struct {
CIDLDropTarget *pdt;
IStream *pstmDataObj;
IDataObject *pdtobj;
DWORD grfKeyState;
POINTL pt;
DWORD dwEffect;
} PRINT_DROP_THREAD;
class CPrinterFolderDropTarget : public CIDLDropTarget
{
friend HRESULT CPrinterFolderDropTarget_CreateInstance(HWND hwnd, IDropTarget **ppdropt);
public:
CPrinterFolderDropTarget(HWND hwnd) : CIDLDropTarget(hwnd) { };
// IDropTarget methods overwirte
STDMETHODIMP DragEnter(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
STDMETHODIMP Drop(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
static STDMETHODIMP _HIDATestForRmPrns( LPIDA pida, int * pcRPFs, int * pcNonRPFs );
static void _FreePrintDropData(PRINT_DROP_THREAD *pthp);
static DWORD CALLBACK _ThreadProc(void *pv);
};
STDMETHODIMP CPrinterFolderDropTarget::_HIDATestForRmPrns(LPIDA pida, int *pcRPFs, int *pcNonRPFs)
{
// check to see if any of the ID's are remote printers....
for (UINT i = 0; i < pida->cidl; i++)
{
LPITEMIDLIST pidlTo = IDA_ILClone(pida, i);
if (pidlTo)
{
LPCITEMIDLIST pidlRemainder = NULL;
// *pidlRemainder will be NULL for remote print folders,
// and non-NULL for printers under remote print folders
if (NET_IsRemoteRegItem(pidlTo, CLSID_Printers, &pidlRemainder)) // && (pidlRemainder->mkid.cb == 0))
{
(*pcRPFs)++;
}
else
{
(*pcNonRPFs)++;
}
ILFree(pidlTo);
}
}
return S_OK;
}
STDMETHODIMP CPrinterFolderDropTarget::DragEnter(IDataObject * pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect)
{
// We allow printer shares to be dropped for installing
// But we don't want to spend the time on DragEnter finding out if it's
// a printer share, so allow drops of any net resource or HIDA
// REVIEW: Actually, it wouldn't take long to check the first one, but
// sequencing through everything does seem like a pain.
// let the base-class process it now to save away the pdwEffect
CIDLDropTarget::DragEnter(pdtobj, grfKeyState, pt, pdwEffect);
// are we dropping on the background ? Do we have the IDLIST clipformat ?
if (m_dwData & DTID_HIDA)
{
int cRPFs = 0;
int cNonRPFs = 0;
STGMEDIUM medium;
FORMATETC fmte = {g_cfNetResource, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
LPIDA pida = DataObj_GetHIDA(pdtobj, &medium);
if (pida)
{
_HIDATestForRmPrns( pida, &cRPFs, &cNonRPFs );
HIDA_ReleaseStgMedium(pida, &medium);
}
// if we have no Remote printers or we have any non "remote printers"
// and we have no other clipformat to test...
if ((( cRPFs == 0 ) || ( cNonRPFs != 0 )) && !( m_dwData & DTID_NETRES ))
{
// the Drop code below only handles drops for HIDA format on NT
// and only if all off them are Remote Printers
*pdwEffect &= ~DROPEFFECT_LINK;
}
}
if ((m_dwData & DTID_NETRES) || (m_dwData & DTID_HIDA))
{
*pdwEffect &= DROPEFFECT_LINK;
}
else
{
*pdwEffect = DROPEFFECT_NONE;
}
m_dwEffectLastReturned = *pdwEffect;
return S_OK;
}
void CPrinterFolderDropTarget::_FreePrintDropData(PRINT_DROP_THREAD *pthp)
{
if (pthp->pstmDataObj)
pthp->pstmDataObj->Release();
if (pthp->pdtobj)
pthp->pdtobj->Release();
pthp->pdt->Release();
LocalFree((HLOCAL)pthp);
}
DWORD CALLBACK CPrinterFolderDropTarget::_ThreadProc(void *pv)
{
PRINT_DROP_THREAD *pthp = (PRINT_DROP_THREAD *)pv;
STGMEDIUM medium;
HRESULT hres = E_FAIL;
FORMATETC fmte = {g_cfHIDA, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
CoGetInterfaceAndReleaseStream(pthp->pstmDataObj, IID_IDataObject, (void **)&pthp->pdtobj);
pthp->pstmDataObj = NULL;
if (pthp->pdtobj == NULL)
{
_FreePrintDropData(pthp);
return 0;
}
// First try to drop as a link to a remote print folder
LPIDA pida = DataObj_GetHIDA(pthp->pdtobj, &medium);
if (pida)
{
// Make sure that if one item in the dataobject is a
// remote print folder, that they are all remote print folders.
// If none are, we just give up on dropping as a RPF link, and
// fall through to checking for printer shares via the
// NETRESOURCE clipboard format, below.
int cRPFs = 0, cNonRPFs = 0;
_HIDATestForRmPrns( pida, &cRPFs, &cNonRPFs );
if ((cRPFs > 0) && (cNonRPFs == 0))
{
// All the items in the dataobject are remote print folders or
// printers under remote printer folders
for (UINT i = 0; i < pida->cidl; i++)
{
LPITEMIDLIST pidlTo = IDA_ILClone(pida, i);
if (pidlTo)
{
LPCITEMIDLIST pidlRemainder; // The part after the remote regitem
NET_IsRemoteRegItem(pidlTo, CLSID_Printers, &pidlRemainder);
if (ILIsEmpty(pidlRemainder))
{
// This is a remote printer folder. Drop a link to the
// 'PrintHood' directory
IShellFolder2 *psf = CPrintRoot_GetPSF();
if (psf)
{
IDropTarget *pdt;
hres = psf->CreateViewObject(pthp->pdt->_GetWindow(),
IID_PPV_ARG(IDropTarget, &pdt));
if (SUCCEEDED(hres))
{
pthp->dwEffect = DROPEFFECT_LINK;
hres = SHSimulateDrop(pdt, pthp->pdtobj, pthp->grfKeyState, &pthp->pt, &pthp->dwEffect);
pdt->Release();
}
}
}
else
{
TCHAR szPrinter[MAX_PATH];
SHGetNameAndFlags(pidlTo, SHGDN_FORPARSING, szPrinter, ARRAYSIZE(szPrinter), NULL);
//
// Setup if not the add printer wizard.
//
if (lstrcmpi(szPrinter, c_szNewObject))
{
LPITEMIDLIST pidl = Printers_PrinterSetup(pthp->pdt->_GetWindow(), MSP_NETPRINTER, szPrinter, NULL);
if (pidl)
ILFree(pidl);
}
// make sure we set hres to S_OK, so we don't break the main loop
hres = S_OK;
}
ILFree(pidlTo);
if (FAILED(hres))
break;
}
}
HIDA_ReleaseStgMedium(pida, &medium);
SHChangeNotifyHandleEvents(); // force update now
goto Cleanup;
}
else if ((cRPFs > 0) && (cNonRPFs > 0))
{
// At least one, but not all, item(s) in this dataobject
// was a remote printer folder. Jump out now.
goto Cleanup;
}
// else none of the items in the dataobject were remote print
// folders, so fall through to the NETRESOURCE parsing
}
// Reset FORMATETC to NETRESOURCE clipformat for next GetData call
fmte.cfFormat = g_cfNetResource;
// DragEnter only allows network resources to be DROPEFFECT_LINKed
ASSERT(S_OK == pthp->pdtobj->QueryGetData(&fmte));
if (SUCCEEDED(pthp->pdtobj->GetData(&fmte, &medium)))
{
LPNETRESOURCE pnr = (LPNETRESOURCE)LocalAlloc(LPTR, 1024);
if (pnr)
{
BOOL fNonPrnShare = FALSE;
UINT cItems = SHGetNetResource(medium.hGlobal, (UINT)-1, NULL, 0);
for (UINT iItem = 0; iItem < cItems; iItem++)
{
if (SHGetNetResource(medium.hGlobal, iItem, pnr, 1024) &&
pnr->dwDisplayType == RESOURCEDISPLAYTYPE_SHARE &&
pnr->dwType == RESOURCETYPE_PRINT)
{
LPITEMIDLIST pidl = Printers_PrinterSetup(pthp->pdt->_GetWindow(),
MSP_NETPRINTER, pnr->lpRemoteName, NULL);
if (pidl)
ILFree(pidl);
}
else
{
if (!fNonPrnShare)
{
// so we don't get > 1 of these messages per drop
fNonPrnShare = TRUE;
// let the user know that they can't drop non-printer
// shares into the printers folder
SetForegroundWindow(pthp->pdt->_GetWindow());
ShellMessageBox(HINST_THISDLL,
pthp->pdt->_GetWindow(),
MAKEINTRESOURCE(IDS_CANTINSTALLRESOURCE), NULL,
MB_OK|MB_ICONINFORMATION,
(LPTSTR)pnr->lpRemoteName);
}
}
}
LocalFree((HLOCAL)pnr);
}
ReleaseStgMedium(&medium);
}
Cleanup:
_FreePrintDropData(pthp);
return 0;
}
STDMETHODIMP CPrinterFolderDropTarget::Drop(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect)
{
*pdwEffect = DROPEFFECT_LINK;
HRESULT hr = CIDLDropTarget::DragDropMenu(DROPEFFECT_LINK, pdtobj,
pt, pdwEffect, NULL, NULL, MENU_PRINTOBJ_NEWPRN_DD, grfKeyState);
if (*pdwEffect)
{
PRINT_DROP_THREAD *pthp = (PRINT_DROP_THREAD *)LocalAlloc(LPTR, SIZEOF(*pthp));
if (pthp)
{
pthp->grfKeyState = grfKeyState;
pthp->pt = pt;
pthp->dwEffect = *pdwEffect;
CoMarshalInterThreadInterfaceInStream(IID_IDataObject, (IUnknown *)pdtobj, &pthp->pstmDataObj);
pthp->pdt = this;
pthp->pdt->AddRef();
if (SHCreateThread(_ThreadProc, pthp, CTF_COINIT, NULL))
{
hr = S_OK;
}
else
{
_FreePrintDropData(pthp);
hr = E_OUTOFMEMORY;
}
}
}
CIDLDropTarget::DragLeave();
return hr;
}
STDAPI CPrinterFolderDropTarget_CreateInstance(HWND hwnd, IDropTarget **ppdropt)
{
*ppdropt = NULL;
HRESULT hr;
CPrinterFolderDropTarget *ppfdt = new CPrinterFolderDropTarget(hwnd);
if (ppfdt)
{
hr = ppfdt->QueryInterface(IID_PPV_ARG(IDropTarget, ppdropt));
ppfdt->Release();
}
else
hr = E_OUTOFMEMORY;
return hr;
}