C++ - Win32 virtual memory allocation functionwin32,memory,function

Win32 virtual memory allocation function

Win32 virtual memory allocation function

Virtual memory is the other API API foundation. API to virtual memory page for the distribution of the smallest units, X86, page length of 4 KB can be used to extract function GetSystemInfo page length. Virtual memory allocation functions include the following functions:

LPVOID VirtualAlloc (LPVOID lpvAddress,

DWORD cbSize,

DWORD fdwAllocationType,

DWORD fdwProtect);

The distribution function for a range of virtual page. Parameters of a designated starting address; 2 parameters specified the length of memory allocation; three parameters specified distribution, and value MEM_COMMINT or MEM_RESERVE parameter control access to the four designated the allocation of memory logo, value for PAGE_READONLY, PAGE_READWRITE or PAGE_NOACCESS.

LPVOID VirtualAllocEx (HANDLE process,

LPVOID lpvAddress,

DWORD cbSize,

DWORD fdwAllocationType,

DWORD fdwProtect);

VirtualAlloc function similar to the function, but the process allows you to specify process. VirtaulFree, VirtualProtect, VirtualQuery have corresponding spread function.

BOOL VirtualFree (LPVOID lpvAddress,

DWORD dwSize,

DWORD dwFreeType);

The function for the release or recovery of the distribution of virtual memory. Parameters of a specified that the release or recovery of memory base address; If it is recovered, two parameters can be at the virtual addresses within the scope of any local, if it is released, the two parameters must be VirtualAlloc return address; three parameters specified whether to release or recovery of memory, Value for MEM_DECOMMINT or MEM_RELEASE.

BOOL VirtualProtect (LPVOID lpvAddress,

DWORD cbSize,

DWORD fdwNewProtect,

PDWORD pfdwOldProtect);

The function has been used to change the distribution of page-protection page. Distribution of a specified parameters-page address parameter 2 designation page length parameter specified page 3 of protection attributes, values PAGE_READ, PAGE_WRITE, PAGE_READWRITE etc.; 4 to return to the original parameters of protection attributes.

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