Source code of Windows XP (NT5)
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42 lines
1.3 KiB

#ifndef COMMONIMAGELIST_H
#define COMMONIMAGELIST_H
class CImageListValidation
{
public:
DWORD wMagic;
CImageListValidation() : wMagic(IMAGELIST_SIG) { }
// it is critical that we zero out wMagic in the destructor
// Yes, the memory is theoretically being freed, but setting
// it to zero ensures that CImageListBase::IsValid()
// will never mistake a freed imagelist for a valid one
~CImageListValidation() {wMagic = 0; }
};
// CImageListBase must begin with CImageListValidation for compat reasons
// We put the IUnknown immediately afterwards so all the people who derive
// from it will agree on where to find QueryInterface et al.
class CImageListBase : public IUnknown, public CImageListValidation
{
public:
BOOL IsValid()
{
return this && !IsBadWritePtr(this, sizeof(*this)) && wMagic == IMAGELIST_SIG;
}
};
#ifndef offsetofclass
// (Magic stolen from atlbase.h because we don't use ATL2.1 any more)
#define offsetofclass(base, derived) ((ULONG_PTR)(static_cast<base*>((derived*)8))-8)
#endif
// Since we know that IUnknown is implemented on CImageListBase, we find out where exactly
// the validation layer is by this macro.
#define FindImageListBase(punk) (CImageListBase*)(CImageListValidation*)((UINT_PTR)punk - offsetofclass(CImageListValidation, CImageListBase));
#endif