VirtualProtect Function (Memoryapi.h) > 자유게시판

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Changes the protection on a region of dedicated pages within the virtual tackle area of the calling course of. To vary the access safety of any course of, use the VirtualProtectEx perform. The handle of the beginning page of the region of pages whose access safety attributes are to be changed. The scale of the area whose entry protection attributes are to be modified, in bytes. Dimension). 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 may be one of many memory protection constants. For mapped views, this worth should be appropriate with the entry safety 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 desired area of pages. If this parameter is NULL or does not level to a valid variable, the function fails.

If the perform succeeds, the return value is nonzero. If the perform fails, the return value is zero. To get extended error data, name GetLastError. You may set the access safety worth on committed pages only. If the state of any page in the required area isn't dedicated, the perform fails and returns with out modifying the entry protection of any pages in the specified region. GUARD safety modifier establishes guard pages. Guard pages act as one-shot access alarms. For extra information, see Creating Guard Pages. It is best to keep away from utilizing VirtualProtect to vary web page protections on memory blocks allotted by GlobalAlloc, HeapAlloc, or LocalAlloc, as a result of multiple memory blocks can exist on a single web page. The heap manager assumes that each one pages in the heap grant at least learn and write entry. When defending a region that will probably be executable, the calling program bears accountability for Memory Wave making certain cache coherency via an applicable call to FlushInstructionCache once the code has been set in place. Otherwise attempts to execute code out of the newly executable area could produce unpredictable outcomes.

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