How can I see the available memory ?

Hello my dear friends

I want to write a simple C++ program that returns 2 things:
Used Memory
Free Available Memory

The reason I am doing this, is because I want to avoid the use of Task Manager. So I am looking for advice on how to do it. I was searching around the net and I found How to: Investigate Memory Usage for Processes . To speak the truth, I didn't understand much .

or ::GetProcessMemoryInfo function ?

I think that this is a simple program to be codded . Hm ?

I am trying to compile this :

Code:

#include <windows.h>
#include <stdio.h>
#include <psapi.h>
#pragma comment(linker, "/DEFAULTLIB:psapi.lib")

void PrintMemoryInfo( DWORD processID )
{
    HANDLE hProcess;
    PROCESS_MEMORY_COUNTERS pmc;

    // Print the process identifier.

    printf( "\nProcess ID: %u\n", processID );

    // Print information about the memory usage of the process.

    hProcess = OpenProcess(  PROCESS_QUERY_INFORMATION |
                                    PROCESS_VM_READ,
                                    FALSE, processID );
    if (NULL == hProcess)
        return;

    if ( GetProcessMemoryInfo( hProcess, &pmc, sizeof(pmc)) )
    {
        printf( "\tPageFaultCount: 0x%08X\n", pmc.PageFaultCount );
        printf( "\tPeakWorkingSetSize: 0x%08X\n",
                  pmc.PeakWorkingSetSize );
        printf( "\tWorkingSetSize: 0x%08X\n", pmc.WorkingSetSize );
        printf( "\tQuotaPeakPagedPoolUsage: 0x%08X\n",
                  pmc.QuotaPeakPagedPoolUsage );
        printf( "\tQuotaPagedPoolUsage: 0x%08X\n",
                  pmc.QuotaPagedPoolUsage );
        printf( "\tQuotaPeakNonPagedPoolUsage: 0x%08X\n",
                  pmc.QuotaPeakNonPagedPoolUsage );
        printf( "\tQuotaNonPagedPoolUsage: 0x%08X\n",
                  pmc.QuotaNonPagedPoolUsage );
        printf( "\tPagefileUsage: 0x%08X\n", pmc.PagefileUsage );
        printf( "\tPeakPagefileUsage: 0x%08X\n",
                  pmc.PeakPagefileUsage );
    }

    CloseHandle( hProcess );
}

int main( )
{
    // Get the list of process identifiers.

    DWORD aProcesses[1024], cbNeeded, cProcesses;
    unsigned int i;

    if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
        return 1;

    // Calculate how many process identifiers were returned.

    cProcesses = cbNeeded / sizeof(DWORD);

    // Print the memory usage for each process

    for ( i = 0; i < cProcesses; i++ )
        PrintMemoryInfo( aProcesses[i] );

	return 0;
}

but in Code::Blocks I get 2 errors:
C:\Users\panos\Documents\OUTOFSCHOOL\LESSON_1\memo ry.o:memory.cpp.text+0x5b)||undefined reference to `_GetProcessMemoryInfo@12'|

C:\Users\panos\Documents\OUTOFSCHOOL\LESSON_1\memo ry.o:memory.cpp.text+0x179)||undefined reference to `_EnumProcesses@12'|
||=== Build finished: 2 errors, 0 warnings ===|


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I found out googling that I have to enter this: -lpsapi in the cmd. But how can I ?

With Code::Blocks in the Project Options or Settings (whichever it is called) which should have a Linker options / Commandline arguments to linker or a similar tab.