TnbWindowPrinter.h

[詳解]

#pragma once
#include "TnbDynamicFunc.h"
 
 
 
//TNB Library
namespace TNB
{
 
 
 
class CWindowPrinter
{
    bool m_hasPrintWindow;  
public:
    CWindowPrinter(void) : m_hasPrintWindow(true)
    {
    }
 
    bool PrintWindow(HWND hWnd, HDC hdc, bool isClientOnly = true)
    {
        bool r = false;
        if ( m_hasPrintWindow )
        {
            try
            {
                typedef BOOL (WINAPI* P_PrintWindow)(HWND, HDC, UINT);
                CDynamicFuncT<P_PrintWindow> pw("USER32.DLL", "PrintWindow");
                r = !! pw()(hWnd, hdc, isClientOnly ? 1/*PW_CLIENTONLY*/ : 0);
            }
            catch ( CNullPointerException& e )
            {
                e.OnCatch();
                m_hasPrintWindow = false;
            }
        }
        if ( ! m_hasPrintWindow )
        {
            UINT message = isClientOnly ? WM_PRINTCLIENT : WM_PRINT;
            WPARAM wParam = reinterpret_cast<WPARAM>(hdc);
            LPARAM lParam = PRF_CLIENT | PRF_NONCLIENT | PRF_OWNED | PRF_CHILDREN;
            r = !! ::SendMessage(hWnd, message, wParam, lParam);
        }
        return r;
    }
};
 
 
 
};//TNB