VirtualProtect Operate Memoryapi.h

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Modifications the safety on a area of dedicated pages within the virtual tackle house of the calling process. To alter the access protection of any course of, use the VirtualProtectEx operate. The address of the beginning page of the region of pages whose access safety attributes are to be changed. The size of the region whose access safety attributes are to be changed, in bytes. Size). This means that a 2-byte vary straddling a web page boundary causes the safety attributes of both pages to be changed. The memory safety choice. This parameter will be one of many memory protection constants. For mapped views, this worth have to be compatible with the access protection specified when the view was mapped (see MapViewOfFile, MapViewOfFileEx, and MapViewOfFileExNuma). A pointer to a variable that receives the previous entry protection value of the first web page in the desired region of pages. If this parameter is NULL or does not level to a valid variable, the perform fails.



If the perform succeeds, the return worth is nonzero. If the function fails, the return worth is zero. To get extended error info, call GetLastError. You may set the access safety worth on dedicated pages only. If the state of any web page in the specified region is not dedicated, the function fails and returns without modifying the access protection of any pages in the required area. GUARD safety modifier establishes guard pages. Guard pages act as one-shot access alarms. For extra info, see Creating Guard Pages. It is best to avoid utilizing VirtualProtect to vary web page protections on memory blocks allocated by GlobalAlloc, HeapAlloc, or LocalAlloc, as a result of multiple Memory Wave Protocol blocks can exist on a single page. The heap manager assumes that each one pages in the heap grant not less than read and write entry. When defending a region that will likely be executable, the calling program bears responsibility for ensuring cache coherency through an acceptable name to FlushInstructionCache as soon as the code has been set in place. Otherwise attempts to execute code out of the newly executable area might produce unpredictable outcomes.



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