虚拟内存的实际应用

Question

我使用过代码

MEMORYSTATUSEX memInfo;
memInfo.dwLength = sizeof(MEMORYSTATUSEX);
GlobalMemoryStatusEx(&memInfo);
DWORDLONG totalVirtualMem = memInfo.ullTotalPageFile;
DWORDLONG virtualMemUsed = memInfo.ullTotalPageFile - memInfo.ullAvailPageFile;
DWORDLONG totalPhysMem = memInfo.ullTotalPhys;

在here

提供

输出如下：2.3GB。

totalVirtualMem = 8.5 Gb
virtualMemUsed  = 2.3 Gb
totalPhysMem    = 4   Gb

这是否意味着我的程序需要2.3Gb内存？你还可以评论总虚拟内存和RAM吗？我也无法运行此代码：

PROCESS_MEMORY_COUNTERS_EX pmc;
GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(pmc));
SIZE_T virtualMemUsedByMe = pmc.PrivateUsage;

因为它给出错误，

error C2664: 'GetProcessMemoryInfo' : cannot convert parameter 2 from 'PROCESS_MEMORY_COUNTERS_EX *' to 'PPROCESS_MEMORY_COUNTERS'

Answer 1

我偶然发现了同样的问题，并发现一个简单的类型转换为我解决了它。

PROCESS_MEMORY_COUNTERS_EX pmc;
GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*)&pmc, sizeof(pmc));
SIZE_T virtualMemUsedByMe = pmc.PrivateUsage;

该解决方案也被描述为here (msdn: Question about GetProcessMemoryInfo)。