Question

I want to calculate total physical memory usage of system.
This is my code:

float totalmem(){

    DWORDLONG totalVirtualMem;
    MEMORYSTATUSEX memInfo;
    float virtualMemUsed;

    memInfo.dwLength = sizeof(MEMORYSTATUSEX);
    GlobalMemoryStatusEx(&memInfo);
    totalVirtualMem = memInfo.ullTotalPageFile;
    virtualMemUsed = (double) (memInfo.ullTotalPageFile - memInfo.ullAvailPageFile) / memInfo.ullTotalPageFile * 100;
    return virtualMemUsed;
}

But the answer is different from that windows task manager or process explorer shows.
What’s wrong with my code?

Answer 1

The correct code:

float totalmem(){

DWORDLONG totalVirtualMem;
MEMORYSTATUSEX memInfo;
float virtualMemUsed;

memInfo.dwLength = sizeof(MEMORYSTATUSEX);
GlobalMemoryStatusEx(&memInfo);
//totalVirtualMem = memInfo.ullTotalPageFile;
virtualMemUsed = (double) (memInfo.ullTotalPhys - memInfo.ullAvailPhys) / memInfo.ullTotalPhys * 100;
return virtualMemUsed;
}