Source code of Windows XP (NT5)
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#include "shellprv.h"
#pragma hdrstop
#include "xiconwrap.h"
// From cplobj.c
EXTERN_C BOOL CPL_FindCPLInfo(LPTSTR pszCmdLine, HICON *phIcon, UINT *ppapl, LPTSTR *pparm);
class CCtrlExtIconBase : public CExtractIconBase
{
public:
HRESULT _GetIconLocationW(UINT uFlags, LPWSTR pszIconFile, UINT cchMax, int *piIndex, UINT *pwFlags);
HRESULT _ExtractW(LPCWSTR pszFile, UINT nIconIndex, HICON *phiconLarge, HICON *phiconSmall, UINT nIconSize);
CCtrlExtIconBase(LPCWSTR pszSubObject);
protected:
~CCtrlExtIconBase();
private:
TCHAR _szSubObject[MAX_PATH];
HICON _hIcon;
UINT _nControl;
};
CCtrlExtIconBase::CCtrlExtIconBase(LPCWSTR pszSubObject) : CExtractIconBase(), _hIcon(NULL), _nControl(-1)
{
lstrcpyn(_szSubObject, pszSubObject, ARRAYSIZE(_szSubObject));
}
CCtrlExtIconBase::~CCtrlExtIconBase()
{
if (_hIcon)
DestroyIcon(_hIcon);
}
STDAPI ControlExtractIcon_CreateInstance(LPCTSTR pszSubObject, REFIID riid, void** ppv)
{
HRESULT hr;
CCtrlExtIconBase* pceib = new CCtrlExtIconBase(pszSubObject);
if (pceib)
{
hr = pceib->QueryInterface(riid, ppv);
pceib->Release();
}
else
{
hr = E_OUTOFMEMORY;
}
return hr;
}
HRESULT CCtrlExtIconBase::_GetIconLocationW(UINT uFlags, LPWSTR pszIconFile,
UINT cchMax, int *piIndex, UINT *pwFlags)
{
HRESULT hr = S_FALSE;
if (!(uFlags & GIL_OPENICON))
{
lstrcpyn(pszIconFile, _szSubObject, cchMax);
LPTSTR pszComma = StrChr(pszIconFile, TEXT(','));
if (pszComma)
{
*pszComma ++= 0;
*piIndex = StrToInt(pszComma);
*pwFlags = GIL_PERINSTANCE;
//
// normally the index will be negative (a resource id)
// check for some special cases like dynamic icons and bogus ids
//
if (*piIndex == 0)
{
LPTSTR lpExtraParms = NULL;
// this is a dynamic applet icon
*pwFlags |= GIL_DONTCACHE | GIL_NOTFILENAME;
// use the applet index in case there's more than one
if ((_hIcon != NULL) || CPL_FindCPLInfo(_szSubObject, &_hIcon,
&_nControl, &lpExtraParms))
{
*piIndex = _nControl;
}
else
{
// we failed to load the applet all of the sudden
// use the first icon in the cpl file (*piIndex == 0)
//
// Assert(FALSE);
DebugMsg(DM_ERROR,
TEXT("Control Panel CCEIGIL: ") TEXT("Enumeration failed \"%s\""),
_szSubObject);
}
}
else if (*piIndex > 0)
{
// this is an invalid icon for a control panel
// use the first icon in the file
// this may be wrong but it's better than a generic doc icon
// this fixes ODBC32 which is NOT dynamic but returns bogus ids
*piIndex = 0;
}
hr = S_OK;
}
}
return hr;
}
HRESULT CCtrlExtIconBase::_ExtractW(LPCWSTR pszFile, UINT nIconIndex,
HICON *phiconLarge, HICON *phiconSmall, UINT nIconSize)
{
LPTSTR lpExtraParms = NULL;
HRESULT hr = S_FALSE;
//-------------------------------------------------------------------
// if there is no icon index then we must extract by loading the dude
// if we have an icon index then it can be extracted with ExtractIcon
// (which is much faster)
// only perform a custom extract if we have a dynamic icon
// otherwise just return S_FALSE and let our caller call ExtractIcon.
//-------------------------------------------------------------------
LPCTSTR p = StrChr(_szSubObject, TEXT(','));
if ((!p || !StrToInt(p+1)) &&
((_hIcon != NULL) || CPL_FindCPLInfo(_szSubObject, &_hIcon,
&_nControl, &lpExtraParms)))
{
if (_hIcon)
{
*phiconLarge = CopyIcon(_hIcon);
*phiconSmall = NULL;
if( *phiconLarge )
hr = S_OK;
}
}
return hr;
}