windows API获取物理内存大于4G的方法

函数原型:

BOOL WINAPI GlobalMemoryStatusEx(_Inout_ LPMEMORYSTATUSEX lpBuffer);

调用dll Kernel32.dll

demo:

//  Sample output:
//  There is       51 percent of memory in use.
//  There are 2029968 total KB of physical memory.
//  There are  987388 free  KB of physical memory.
//  There are 3884620 total KB of paging file.
//  There are 2799776 free  KB of paging file.
//  There are 2097024 total KB of virtual memory.
//  There are 2084876 free  KB of virtual memory.
//  There are       0 free  KB of extended memory.

#include <windows.h>
#include <stdio.h>
#include <tchar.h>

// Use to convert bytes to KB
#define DIV 1024

// Specify the width of the field in which to print the numbers.
// The asterisk in the format specifier "%*I64d" takes an integer
// argument and uses it to pad and right justify the number.
#define WIDTH 7

void _tmain()
{
MEMORYSTATUSEX statex;

statex.dwLength = sizeof (statex);

GlobalMemoryStatusEx (&statex);

_tprintf (TEXT("There is  %*ld percent of memory in use.\n"),
WIDTH, statex.dwMemoryLoad);
_tprintf (TEXT("There are %*I64d total KB of physical memory.\n"),
WIDTH, statex.ullTotalPhys/DIV);
_tprintf (TEXT("There are %*I64d free  KB of physical memory.\n"),
WIDTH, statex.ullAvailPhys/DIV);
_tprintf (TEXT("There are %*I64d total KB of paging file.\n"),
WIDTH, statex.ullTotalPageFile/DIV);
_tprintf (TEXT("There are %*I64d free  KB of paging file.\n"),
WIDTH, statex.ullAvailPageFile/DIV);
_tprintf (TEXT("There are %*I64d total KB of virtual memory.\n"),
WIDTH, statex.ullTotalVirtual/DIV);
_tprintf (TEXT("There are %*I64d free  KB of virtual memory.\n"),
WIDTH, statex.ullAvailVirtual/DIV);

// Show the amount of extended memory available.

_tprintf (TEXT("There are %*I64d free  KB of extended memory.\n"),
WIDTH, statex.ullAvailExtendedVirtual/DIV);
}