windows-nt/Source/XPSP1/NT/shell/shell32/psxa.c

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2020-09-26 03:20:57 -05:00
//
// PropSheetExtArray implementation, use for control panel applets to extend their pages
//
// Manipulates a group of property sheet extension objects (see PSXA.H)
//
#include "shellprv.h"
#pragma hdrstop
// header for an array of IShellPropSheetExt interface pointers
typedef struct
{
UINT count, alloc;
IShellPropSheetExt *interfaces[ 0 ];
} PSXA;
// used to forward LPFNADDPROPSHEETPAGE calls with added error checking
typedef struct
{
LPFNADDPROPSHEETPAGE pfn;
LPARAM lparam;
UINT count;
BOOL allowmulti;
BOOL alreadycalled;
} _PSXACALLINFO;
// forwards an LPFNADDPROPSHEETPAGE call with added error checking
BOOL CALLBACK _PsxaCallOwner(HPROPSHEETPAGE hpage, LPARAM lparam)
{
_PSXACALLINFO *callinfo = (_PSXACALLINFO *)lparam;
if (callinfo)
{
if (!callinfo->allowmulti && callinfo->alreadycalled)
return FALSE;
if (callinfo->pfn(hpage, callinfo->lparam))
{
callinfo->alreadycalled = TRUE;
callinfo->count++;
return TRUE;
}
}
return FALSE;
}
// creates an instance of the property sheet extension referred to by szCLSID
// initializes it via the IShellExtInit (if IShellExtInit is supported)
BOOL InitPropSheetExt(IShellPropSheetExt **ppspx, LPCTSTR pszCLSID, HKEY hKey, IDataObject *pDataObj)
{
if (SUCCEEDED(SHExtCoCreateInstance(pszCLSID, NULL, NULL, &IID_IShellPropSheetExt, ppspx)))
{
IShellExtInit *psxi;
if (SUCCEEDED((*ppspx)->lpVtbl->QueryInterface(*ppspx, &IID_IShellExtInit, &psxi)))
{
if (FAILED(psxi->lpVtbl->Initialize(psxi, NULL, pDataObj, hKey)))
{
(*ppspx)->lpVtbl->Release(*ppspx);
*ppspx = NULL;
}
psxi->lpVtbl->Release(psxi);
}
}
return BOOLFROMPTR(*ppspx);
}
// uses hKey and pszSubKey to find property sheet handlers in the registry
// loads up to max_iface IShellPropSheetExt interfaces (so I'm lazy...)
// returns a handle (pointer) to a newly allocated PSXA
HPSXA SHCreatePropSheetExtArrayEx(HKEY hKey, LPCTSTR pszLocation, UINT max_iface, IDataObject *pDataObj)
{
BOOL success = FALSE;
PSXA *psxa = LocalAlloc(LPTR, sizeof(*psxa) + sizeof(IShellPropSheetExt *) * max_iface);
if (psxa)
{
IShellPropSheetExt **spsx = psxa->interfaces;
HKEY hkLocation;
UINT i;
psxa->count = 0;
psxa->alloc = max_iface;
for (i = 0; i < psxa->alloc; i++, spsx++)
*spsx = NULL;
if (RegOpenKey(hKey, pszLocation, &hkLocation) == ERROR_SUCCESS)
{
HKEY hkHandlers;
if (RegOpenKey(hkLocation, STRREG_SHEX_PROPSHEET, &hkHandlers) == ERROR_SUCCESS)
{
TCHAR szChild[ 64 ]; // yes, this is totally arbitrary...
// fill until there's no room or no more subkeys to get
for (i = 0;
(psxa->count < psxa->alloc) &&
(RegEnumKey(hkHandlers, (int)i, szChild,
ARRAYSIZE(szChild)) == ERROR_SUCCESS);
i++)
{
TCHAR szCLSID[ MAX_PATH ];
LONG len_szCLSID = ARRAYSIZE(szCLSID);
if (SHRegQueryValue(hkHandlers, szChild, szCLSID,
&len_szCLSID) == ERROR_SUCCESS)
{
if (InitPropSheetExt(&psxa->interfaces[ psxa->count ],
szCLSID, hKey, pDataObj))
{
psxa->count++;
}
}
}
RegCloseKey(hkHandlers);
success = TRUE;
}
RegCloseKey(hkLocation);
}
}
if (!success && psxa)
{
SHDestroyPropSheetExtArray((HPSXA)psxa);
psxa = NULL;
}
return (HPSXA)psxa;
}
HPSXA SHCreatePropSheetExtArray(HKEY hKey, LPCTSTR pszLocation, UINT max_iface)
{
return SHCreatePropSheetExtArrayEx(hKey, pszLocation, max_iface, NULL);
}
// releases interfaces in a PSXA and frees the memory it occupies
void SHDestroyPropSheetExtArray(HPSXA hpsxa)
{
PSXA *psxa = (PSXA *)hpsxa;
IShellPropSheetExt **spsx = psxa->interfaces;
UINT i;
// release the interfaces
for (i = 0; i < psxa->count; i++, spsx++)
(*spsx)->lpVtbl->Release(*spsx);
LocalFree(psxa);
}
// asks each interface in a PSXA to add pages for a proprty sheet
// returns the number of pages actually added
UINT SHAddFromPropSheetExtArray(HPSXA hpsxa, LPFNADDPROPSHEETPAGE lpfnAddPage, LPARAM lParam)
{
PSXA *psxa = (PSXA *)hpsxa;
IShellPropSheetExt **spsx = psxa->interfaces;
_PSXACALLINFO callinfo = { lpfnAddPage, lParam, 0, TRUE, FALSE };
UINT i;
for (i = 0; i < psxa->count; i++, spsx++)
(*spsx)->lpVtbl->AddPages(*spsx, _PsxaCallOwner, (LPARAM)&callinfo);
return callinfo.count;
}
// asks each interface in a PSXA to replace a page in a prop sheet
// each interface is only allowed to add up to one replacement
// returns the total number of replacements added
UINT SHReplaceFromPropSheetExtArray(HPSXA hpsxa, UINT uPageID,
LPFNADDPROPSHEETPAGE lpfnReplaceWith, LPARAM lParam)
{
PSXA *psxa = (PSXA *)hpsxa;
IShellPropSheetExt **spsx = psxa->interfaces;
_PSXACALLINFO callinfo = { lpfnReplaceWith, lParam, 0, FALSE, FALSE };
UINT i;
for (i = 0; i < psxa->count; i++, spsx++)
{
// reset the call flag so that each provider gets a chance
callinfo.alreadycalled = FALSE;
if ((*spsx)->lpVtbl->ReplacePage)
(*spsx)->lpVtbl->ReplacePage(*spsx, uPageID, _PsxaCallOwner, (LPARAM)&callinfo);
}
return callinfo.count;
}