Thread: How can I see the available memory ?

  1. #1
    Registered User Dr.Paneas's Avatar
    Join Date
    Nov 2009

    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 ?
    Last edited by Dr.Paneas; 03-03-2010 at 07:04 AM.

  2. #2
    Registered User Dr.Paneas's Avatar
    Join Date
    Nov 2009
    I am trying to compile this :

    #include <windows.h>
    #include <stdio.h>
    #include <psapi.h>
    #pragma comment(linker, "/DEFAULTLIB:psapi.lib")
    void PrintMemoryInfo( DWORD processID )
        HANDLE hProcess;
        // Print the process identifier.
        printf( "\nProcess ID: %u\n", processID );
        // Print information about the memory usage of the process.
        hProcess = OpenProcess(  PROCESS_QUERY_INFORMATION |
                                        FALSE, processID );
        if (NULL == hProcess)
        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 ===|


    I found out googling that I have to enter this: -lpsapi in the cmd. But how can I ?
    Last edited by Dr.Paneas; 03-03-2010 at 07:33 AM.

  3. #3
    The larch
    Join Date
    May 2006
    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.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

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