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VirtualQuery info  Overview  Group

The VirtualQuery function provides information about a range of pages in the virtual address space of the calling process.

DWORD VirtualQuery(

    LPCVOID lpAddress,

// address of region


// address of information buffer

    DWORD dwLength 

// size of buffer



Points to the base address of the region of pages to be queried. This value is rounded down to the next page boundary. To determine the size of a page on the host computer, use the GetSystemInfo function.
Points to a MEMORY_BASIC_INFORMATION structure in which information about the specified page range is returned.
Specifies the size, in bytes, of the buffer pointed to by the lpBuffer parameter.

Return Values

The return value is the actual number of bytes returned in the information buffer.


VirtualQuery provides information about a region of consecutive pages beginning at a specified address that share the following attributes:

The function determines the attributes of the first page in the region and then scans subsequent pages until it scans the entire range of pages or until it encounters a page with a nonmatching set of attributes. The function returns the attributes and the size, in bytes, of the region of pages with matching attributes. For example, if there is a 40 megabyte (MB) region of free memory, and VirtualQuery is called on a page that is 10 MB into the region, the function will obtain a state of MEM_FREE and a size of 30 MB.

This function reports on a region of pages in the memory of the calling process, and the VirtualQueryEx function reports on a region of pages in the memory of a specified process.

See Also

GetSystemInfo, MEMORY_BASIC_INFORMATION, VirtualQueryEx 

file: /Techref/os/win/api/win32/func/src/f90_15.htm, 4KB, , updated: 2000/4/7 11:19, local time: 2023/12/3 02:25,

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