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C++ (Qt)
#include <QtGui/QApplication>
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QSettings>
#include <QLibrary>
#include "WMI_access.h"
 
void MainWindow::getRamInfo()
{
    //QString ramCount;
    QLibrary wmi_lib("WMI_access");
    wmi_lib.load();
    if (wmi_lib.isLoaded())
        qDebug() << "Loaded";
    else
        qDebug() <<"Not Loaded";
 
    typedef clRamData(_stdcall *myRamInfo)();
    myRamInfo ramData = (myRamInfo)wmi_lib.resolve("ramData");
 
    if (ramData)
    {
        qDebug() << "ok??";
        clRamData ramInfo;
        ramInfo = ramData();
        qDebug() << "ram available: " <<ramInfo.ramAvailable;
    }
    else qDebug() << "error";
}

C++ (Qt)
#ifndef __WMI_ACCESS_H
#define __WMI_ACCESS_H
 
#include <iostream>
#include <string>
using namespace std;
 
    class clCpuData
	{
	public:
		string cpuManufacturer;
		string cpuName;
		int cpuLoadPercentage;
		int cpuMaxClockSpeed;
		int cpuNumberOfCores;
		int cpuNumberOfLogicalProcessors;
		int cpuNumberOfProcessors;
		string cpuError;
	};
 
	class clHddData
	{
	public:
		string hddName;
		int hddRRER_trsh;	//Raw Read Error Rate
		int hddRRER;		
		int hddSUP_trsh;	//Spin Up Time
		int hddSUP;
		int hddSSC_trsh;	//Start/Stop Count
		int hddSSC;
		int hddRSC_trsh;	//Reallocated Sector Count 
		int hddRSC;
		int hddSER_trsh;	//Seek Error Rate
		int hddSER;
		int hddPOTC_trsh;	//Power On Time Count 
		int hddPOTC; 
		int hddSRC_trsh;	//Spin Retry Count
		int hddSRC;
		int hddPCC_trsh;	//Power Cycle Count
		int hddPCC;
		int hddT_trsh;		//Temperature
		int hddT;
		int hddECC_trsh;	//Hardware ECC Recovered
		int hddECC;
		int hddCPSC_trsh;	//Current Pending Secotr Count 
		int hddCPSC;
		int hddUSC_trsh;	//Off line Uncorrectable Sector Count
		int hddUSC;
		int hddCRC_trsh;	//Ultra ATA CRC Error Rate
		int	hddCRC;
		int hddWER_trsh;	//Write Error Rate
		int hddWER;
		string hddError;
	};
 
	class clRamData
	{
		public:
		double ramCount;
		long ramAvailable;
		string ramError;
	};
 
	class clWMI_access_fn
    {
	public:
 
                __declspec(dllexport) clHddData hddData();
		__declspec(dllexport) clCpuData cpuData();
		__declspec(dllexport) clRamData ramData();
 
    };
 
 
#endif /* __WMI_ACCESS_H*/

Starting Q:\Darbai\HTMON\Client\client\debug\client.exe...
Loaded 
error 

C++ (Qt)
class clRamData
        {
        public:
            double ramCount;
            long ramAvailable;
            QString ramError;
        };
 
typedef clRamData(_stdcall *fnRamData)();
 
void MainWindow::getRamInfo()
{
    QLibrary wmi_lib("WMI_access");
    wmi_lib.load();
    if (wmi_lib.isLoaded())
        qDebug() << "Loaded";
    else
        qDebug() <<"Not Loaded";
 
    fnRamData fn_ramData;
    fn_ramData = (fnRamData)wmi_lib.resolve("ramData");
 
    if (fn_ramData)
    {
        qDebug() << "ok..";
        clRamData ramInfo;
        qDebug() << "class created..";
        ramInfo = fn_ramData(); // тут программа вылетает....
        qDebug() << "function called..";
        qDebug() << "ram available: " << ramInfo.ramAvailable;
    }
    else qDebug() << "error";
}

C++ (Qt)
qDebug() << "function called..";
qDebug() << "ram available: " << ramInfo.ramAvailable;

qDebug() << "ram count: " << ramInfo.ramCount;