Source code of Windows XP (NT5)
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#include "stock.h"
#pragma hdrstop
#include <varutil.h>
#include <shdocvw.h>
#define VariantInit(p) memset(p, 0, sizeof(*(p)))
// ---------------------------------------------------
//
// InitVariantFrom... functions
//
STDAPI InitVariantFromInt(VARIANT *pvar, int lVal)
{
pvar->vt = VT_I4;
pvar->lVal = lVal;
return S_OK;
}
STDAPI InitVariantFromUINT(VARIANT *pvar, UINT ulVal)
{
pvar->vt = VT_UI4;
pvar->ulVal = ulVal;
return S_OK;
}
STDAPI_(UINT) VariantToUINT(VARIANT varIn)
{
VARIANT varResult = {0};
return SUCCEEDED(VariantChangeType(&varResult, &varIn, 0, VT_UI4)) ? varResult.ulVal : 0;
}
STDAPI_(int) VariantToInt(VARIANT varIn)
{
VARIANT varResult = {0};
return SUCCEEDED(VariantChangeType(&varResult, &varIn, 0, VT_I4)) ? varResult.lVal : 0;
}
STDAPI_(BOOL) VariantToBOOL(VARIANT varIn)
{
VARIANT varResult = {0};
if (SUCCEEDED(VariantChangeType(&varResult, &varIn, 0, VT_BOOL)))
return (varResult.boolVal == VARIANT_FALSE) ? FALSE : TRUE;
return FALSE;
}
STDAPI_(BOOL) VariantToBuffer(const VARIANT* pvar, void *pv, UINT cb)
{
if (pvar && pvar->vt == (VT_ARRAY | VT_UI1))
{
CopyMemory(pv, pvar->parray->pvData, cb);
return TRUE;
}
return FALSE;
}
STDAPI_(BOOL) VariantToGUID(const VARIANT *pvar, GUID *pguid)
{
return VariantToBuffer(pvar, pguid, sizeof(*pguid));
}
STDAPI_(LPCWSTR) VariantToStrCast(const VARIANT *pvar)
{
LPCWSTR psz = NULL;
ASSERT(!IsBadReadPtr(pvar, sizeof(pvar)));
if (pvar->vt == (VT_BYREF | VT_VARIANT) && pvar->pvarVal)
pvar = pvar->pvarVal;
if (pvar->vt == VT_BSTR)
psz = pvar->bstrVal;
else if (pvar->vt == (VT_BSTR | VT_BYREF))
psz = *pvar->pbstrVal;
return psz;
}
STDAPI InitVariantFromBuffer(VARIANT *pvar, const void *pv, UINT cb)
{
HRESULT hr;
VariantInit(pvar);
SAFEARRAY *psa = SafeArrayCreateVector(VT_UI1, 0, cb); // create a one-dimensional safe array
if (psa)
{
CopyMemory(psa->pvData, pv, cb);
pvar->vt = VT_ARRAY | VT_UI1;
pvar->parray = psa;
hr = S_OK;
}
else
hr = E_OUTOFMEMORY;
return hr;
}
STDAPI_(UINT) _MyILGetSize(LPCITEMIDLIST pidl)
{
UINT cbTotal = 0;
if (pidl)
{
cbTotal += sizeof(pidl->mkid.cb); // Null terminator
while (pidl->mkid.cb)
{
cbTotal += pidl->mkid.cb;
pidl = _ILNext(pidl);
}
}
return cbTotal;
}
STDAPI InitVariantFromIDList(VARIANT* pvar, LPCITEMIDLIST pidl)
{
return InitVariantFromBuffer(pvar, pidl, _MyILGetSize(pidl));
}
STDAPI InitVariantFromGUID(VARIANT *pvar, REFGUID guid)
{
return InitVariantFromBuffer(pvar, &guid, sizeof(guid));
}
STDAPI InitBSTRVariantFromGUID(VARIANT *pvar, REFGUID guid)
{
WCHAR wszGuid[GUIDSTR_MAX];
HRESULT hr;
if (SUCCEEDED(SHStringFromGUIDW(guid, wszGuid, ARRAYSIZE(wszGuid))))
{
hr = InitVariantFromStr(pvar, wszGuid);
}
else
{
hr = E_FAIL;
VariantInit(pvar);
}
return hr;
}
// note, this frees the STRRET contents
STDAPI InitVariantFromStrRet(STRRET *pstrret, LPCITEMIDLIST pidl, VARIANT *pv)
{
WCHAR szTemp[INFOTIPSIZE];
HRESULT hres = StrRetToBufW(pstrret, pidl, szTemp, ARRAYSIZE(szTemp));
if (SUCCEEDED(hres))
{
pv->bstrVal = SysAllocString(szTemp);
if (pv->bstrVal)
pv->vt = VT_BSTR;
hres = pv->bstrVal ? S_OK : E_OUTOFMEMORY;
}
return hres;
}
// returns:
// S_OK success
// S_FALSE successfully created an empty string from a NULL [in] parameter
// E_OUTOFMEMORY
STDAPI InitVariantFromStr(VARIANT *pvar, LPCWSTR psz)
{
VariantInit(pvar);
// There is no NULL bstr value, so convert NULL to "".
pvar->bstrVal = SysAllocString(psz ? psz : L"");
if (pvar->bstrVal)
pvar->vt = VT_BSTR;
return pvar->bstrVal ? (psz ? S_OK : S_FALSE) : E_OUTOFMEMORY;
}
// time is in GMT. this function converts to local time
STDAPI InitVariantFromFileTime(const FILETIME *pft, VARIANT *pv)
{
SYSTEMTIME st;
FILETIME ftLocal;
FileTimeToLocalFileTime(pft, &ftLocal);
//
// Watch out for the special filesystem "uninitialized" values.
//
if (FILETIMEtoInt64(*pft) == FT_NTFS_UNKNOWNGMT ||
FILETIMEtoInt64(ftLocal) == FT_FAT_UNKNOWNLOCAL)
return E_FAIL;
FileTimeToSystemTime(pft, &st);
pv->vt = VT_DATE;
return SystemTimeToVariantTime(&st, &pv->date) ? S_OK : E_FAIL; // delay load...
}
// Note: will allocate it for you if you pass NULL pszBuf
STDAPI_(LPTSTR) VariantToStr(const VARIANT *pvar, LPWSTR pszBuf, int cchBuf)
{
TCHAR szBuf[INFOTIPSIZE];
if (pszBuf)
{
DEBUGWhackPathBuffer(pszBuf, cchBuf);
}
else
{
pszBuf = szBuf;
cchBuf = ARRAYSIZE(szBuf);
}
*pszBuf = 0;
BOOL fDone = FALSE;
if (pvar->vt == VT_DATE) // we want our date formatting
{
USHORT wDosDate, wDosTime;
if (VariantTimeToDosDateTime(pvar->date, &wDosDate, &wDosTime))
{
DosTimeToDateTimeString(wDosDate, wDosTime, pszBuf, cchBuf, 0);
fDone = TRUE;
}
}
if (!fDone)
{
VARIANT varDst = {0};
if (VT_BSTR != pvar->vt)
{
if (S_OK == VariantChangeType(&varDst, (VARIANT*)pvar, 0, VT_BSTR))
{
ASSERT(VT_BSTR == varDst.vt);
pvar = &varDst;
}
else
pszBuf = NULL; // error
}
if (VT_BSTR == pvar->vt)
{
StrCpyNW(pszBuf, pvar->bstrVal, cchBuf);
}
if (pvar == &varDst)
VariantClear(&varDst);
}
if (pszBuf == szBuf)
return StrDup(szBuf);
else
return pszBuf;
}
// ---------------------------------------------------
// [in,out] pvar: [in] initialized with property bag data
// [out] data in format vtDesired or VT_EMPTY if no conversion
// [in] vtDesired: [in] type to convert to, or VT_EMPTY to accept all types of data
//
STDAPI VariantChangeTypeForRead(VARIANT *pvar, VARTYPE vtDesired)
{
HRESULT hr = S_OK;
if ((pvar->vt != vtDesired) && (vtDesired != VT_EMPTY))
{
VARIANT varTmp;
VARIANT varSrc;
// cache a copy of [in]pvar in varSrc - we will free this later
CopyMemory(&varSrc, pvar, sizeof(varTmp));
VARIANT* pvarToCopy = &varSrc;
// oleaut's VariantChangeType doesn't support
// hex number string -> number conversion, which we want,
// so convert those to another format they understand.
//
// if we're in one of these cases, varTmp will be initialized
// and pvarToCopy will point to it instead
//
if (VT_BSTR == varSrc.vt)
{
switch (vtDesired)
{
case VT_I1:
case VT_I2:
case VT_I4:
case VT_INT:
{
if (StrToIntExW(varSrc.bstrVal, STIF_SUPPORT_HEX, &varTmp.intVal))
{
varTmp.vt = VT_INT;
pvarToCopy = &varTmp;
}
break;
}
case VT_UI1:
case VT_UI2:
case VT_UI4:
case VT_UINT:
{
if (StrToIntExW(varSrc.bstrVal, STIF_SUPPORT_HEX, (int*)&varTmp.uintVal))
{
varTmp.vt = VT_UINT;
pvarToCopy = &varTmp;
}
break;
}
}
}
// clear our [out] buffer, in case VariantChangeType fails
VariantInit(pvar);
hr = VariantChangeType(pvar, pvarToCopy, 0, vtDesired);
// clear the cached [in] value
VariantClear(&varSrc);
// if initialized, varTmp is VT_UINT or VT_UINT, neither of which need VariantClear
}
return hr;
}
// ---------------------------------------------------
//
// Other conversion functions
//
STDAPI_(BSTR) SysAllocStringA(LPCSTR psz)
{
if (psz)
{
WCHAR wsz[INFOTIPSIZE]; // assumes INFOTIPSIZE number of chars max
SHAnsiToUnicode(psz, wsz, ARRAYSIZE(wsz));
return SysAllocString(wsz);
}
return NULL;
}
STDAPI StringToStrRetW(LPCWSTR pszName, STRRET *pStrRet)
{
pStrRet->uType = STRRET_WSTR;
return SHStrDupW(pszName, &pStrRet->pOleStr);
}
STDAPI_(void) DosTimeToDateTimeString(WORD wDate, WORD wTime, LPTSTR pszText, UINT cchText, int fmt)
{
FILETIME ft;
DWORD dwFlags = FDTF_DEFAULT;
// Netware directories do not have dates...
if (wDate == 0)
{
*pszText = 0;
return;
}
DosDateTimeToFileTime(wDate, wTime, &ft);
switch (fmt) {
case LVCFMT_LEFT_TO_RIGHT :
dwFlags |= FDTF_LTRDATE;
break;
case LVCFMT_RIGHT_TO_LEFT :
dwFlags |= FDTF_RTLDATE;
break;
}
SHFormatDateTime(&ft, &dwFlags, pszText, cchText);
}
STDAPI GetDateProperty(IShellFolder2 *psf, LPCITEMIDLIST pidl, const SHCOLUMNID *pscid, FILETIME *pft)
{
VARIANT var = {0};
HRESULT hr = psf->GetDetailsEx(pidl, pscid, &var);
if (SUCCEEDED(hr))
{
hr = E_FAIL;
if (VT_DATE == var.vt)
{
SYSTEMTIME st;
if (VariantTimeToSystemTime(var.date, &st) && SystemTimeToFileTime(&st, pft))
{
hr = S_OK;
}
}
VariantClear(&var); // Done with it.
}
return hr;
}
STDAPI GetLongProperty(IShellFolder2 *psf, LPCITEMIDLIST pidl, const SHCOLUMNID *pscid, ULONGLONG *pullVal)
{
*pullVal = 0;
VARIANT var = {0};
HRESULT hr = psf->GetDetailsEx(pidl, pscid, &var);
if (SUCCEEDED(hr))
{
if (VT_UI8 == var.vt)
{
*pullVal = var.ullVal;
hr = S_OK;
}
else
{
VARIANT varLong = {0};
hr = VariantChangeType(&varLong, &var, 0, VT_UI8);
if (SUCCEEDED(hr))
{
*pullVal = varLong.ullVal;
VariantClear(&varLong);
}
}
VariantClear(&var); // Done with it.
}
return hr;
}
STDAPI GetStringProperty(IShellFolder2 *psf, LPCITEMIDLIST pidl, const SHCOLUMNID *pscid, LPTSTR pszVal, int cchMax)
{
*pszVal = 0;
VARIANT var = {0};
HRESULT hr = psf->GetDetailsEx(pidl, pscid, &var);
if (SUCCEEDED(hr))
{
hr = VariantToStr(&var, pszVal, cchMax) ? S_OK : E_FAIL;
VariantClear(&var); // Done with it.
}
return hr;
}
STDAPI QueryInterfaceVariant(VARIANT v, REFIID riid, void **ppv)
{
*ppv = NULL;
HRESULT hr = E_NOINTERFACE;
if ((VT_UNKNOWN == v.vt) && v.punkVal)
{
hr = v.punkVal->QueryInterface(riid, ppv);
}
return hr;
}