VirtualProtect Operate (Memoryapi.h)
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Changes the safety on a region of dedicated pages within the virtual tackle area of the calling course of. To alter the access safety of any process, use the VirtualProtectEx perform. The deal with of the beginning web page of the region of pages whose entry safety attributes are to be changed. The size of the region whose access safety attributes are to be modified, in bytes. Size). Which means that a 2-byte vary straddling a page boundary causes the protection attributes of each pages to be modified. The memory protection option. This parameter might be one of many Memory Wave System protection constants. For mapped views, this worth should be suitable with the entry protection specified when the view was mapped (see MapViewOfFile, MapViewOfFileEx, and MapViewOfFileExNuma). A pointer to a variable that receives the earlier entry protection value of the first page in the specified region of pages. If this parameter is NULL or does not level to a legitimate variable, the operate fails.


If the perform succeeds, the return value is nonzero. If the operate fails, the return value is zero. To get extended error data, call GetLastError. You'll be able to set the access protection value on dedicated pages only. If the state of any page in the specified region just isn't committed, the function fails and returns without modifying the entry protection of any pages in the required area. GUARD safety modifier establishes guard pages. Guard pages act as one-shot entry alarms. For extra info, Memory Wave see Creating Guard Pages. It is best to keep away from using VirtualProtect to change page protections on memory blocks allotted by GlobalAlloc, HeapAlloc, or LocalAlloc, because multiple memory blocks can exist on a single web page. The heap supervisor assumes that all pages within the heap grant at least read and write access. When protecting a region that can be executable, the calling program bears accountability for ensuring cache coherency through an applicable call to FlushInstructionCache once the code has been set in place. In any other case attempts to execute code out of the newly executable region could produce unpredictable results.


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