VirtualProtect Function Memoryapi.h
Changes the safety on a region of dedicated pages in the digital tackle house of the calling process. To alter the entry protection of any course of, use the VirtualProtectEx operate. The tackle of the starting web page of the area of pages whose access safety attributes are to be changed. The dimensions of the area whose access safety attributes are to be changed, in bytes. Measurement). Because of this a 2-byte vary straddling a page boundary causes the protection attributes of both pages to be changed. The memory protection option. This parameter could be one of the memory safety constants. For mapped views, this value must be appropriate with the access safety specified when the view was mapped (see MapViewOfFile, MapViewOfFileEx, and Memory Wave MapViewOfFileExNuma). A pointer to a variable that receives the previous access safety worth of the primary page in the required region of pages. If this parameter is NULL or doesn't level to a sound variable, the function fails.
If the operate succeeds, the return value is nonzero. If the operate fails, the return worth is zero. To get extended error data, name GetLastError. You'll be able to set the entry protection worth on committed pages solely. If the state of any web page in the required area will not be dedicated, the operate fails and returns with out modifying the entry protection of any pages in the desired area. GUARD protection modifier establishes guard pages. Guard pages act as one-shot entry alarms. For more info, see Creating Guard Pages. It's best to avoid utilizing VirtualProtect to vary web page protections on memory blocks allocated by GlobalAlloc, HeapAlloc, or LocalAlloc, because multiple memory blocks can exist on a single web page. The heap supervisor assumes that each one pages in the heap grant no less than learn and write access. When protecting a area that will probably be executable, the calling program bears responsibility for guaranteeing cache coherency via an acceptable call to FlushInstructionCache once the code has been set in place. Otherwise makes an attempt to execute code out of the newly executable area could produce unpredictable results.
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