maxDcb-C2Core/modules/ScreenShot/ScreenShooter.h

#pragma once

#include <vector>
#include "HandleGuards.h"


namespace ScreenShooter
{

typedef std::vector<std::pair<HDC, RECT>> HDCPoolType;


void CaptureScreen(std::vector<unsigned char>& dataScreen);


BOOL CALLBACK MonitorEnumProc(
    HMONITOR hMonitor,  // handle to display monitor
    HDC hdcMonitor,     // handle to monitor DC
    LPRECT lprcMonitor, // monitor intersection rectangle
    LPARAM dwData       // data
    );


class CDisplayHandlesPool
{
public:

    typedef HDCPoolType::iterator iterator;

    CDisplayHandlesPool()
    {
        guards::CDCGuard captureGuard(0);
        HDC hDesktopDC = GetDC(NULL);
        if (!hDesktopDC)
        {
            // throw std::runtime_error("CDisplayHandlesPool: GetDC failed");
        }
        guards::CDCGuard desktopGuard(hDesktopDC);

        if(!EnumDisplayMonitors(hDesktopDC, NULL, MonitorEnumProc, reinterpret_cast<LPARAM>(this)))
        {
            // throw std::runtime_error("CDisplayHandlesPool: EnumDisplayMonitors failed");
        }
    }

    ~CDisplayHandlesPool()
    {
        for(HDCPoolType::iterator it = m_hdcPool.begin(); it != m_hdcPool.end(); ++it)
        {
            if(it->first)
                DeleteDC(it->first);
        }
    }

    void AddHdcToPool(guards::CDCGuard & hdcGuard, RECT rect)
    {
        m_hdcPool.push_back(std::make_pair(hdcGuard.get(), rect));
        hdcGuard.release();
    }

    iterator begin()
    {
        return m_hdcPool.begin();
    }
    
    iterator end()
    {
        return m_hdcPool.end();
    } 

private:
    HDCPoolType m_hdcPool;

    CDisplayHandlesPool(const CDisplayHandlesPool & other);
    CDisplayHandlesPool & operator = (CDisplayHandlesPool);
    
};


}