WTL使用双缓冲避免重绘闪烁

1、继承自CDoubleBufferImpl

template <class T>
class CDoubleBufferImpl
{
public:
// Overrideables
	void DoPaint(CDCHandle /*dc*/)
	{
		// must be implemented in a derived class
		ATLASSERT(FALSE);
	}

// Message map and handlers
	BEGIN_MSG_MAP(CDoubleBufferImpl)
		MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBackground)
		MESSAGE_HANDLER(WM_PAINT, OnPaint)
#ifndef _WIN32_WCE
		MESSAGE_HANDLER(WM_PRINTCLIENT, OnPaint)
#endif // !_WIN32_WCE
	END_MSG_MAP()

	LRESULT OnEraseBackground(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		return 1;   // no background painting needed
	}

	LRESULT OnPaint(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);
		ATLASSERT(::IsWindow(pT->m_hWnd));

		if(wParam != NULL)
		{
			RECT rect = { 0 };
			pT->GetClientRect(&rect);
			CMemoryDC dcMem((HDC)wParam, rect);
			pT->DoPaint(dcMem.m_hDC);
		}
		else
		{
			CPaintDC dc(pT->m_hWnd);
			CMemoryDC dcMem(dc.m_hDC, dc.m_ps.rcPaint);
			pT->DoPaint(dcMem.m_hDC);
		}

		return 0;
	}
};

2、添加消息映射

CHAIN_MSG_MAP(CDoubleBufferImpl<CMainDlg>)

3、增加DoPaint函数void DoPaint(CDCHandle dc);

4、将OnPaint的代码应用于DoPaint即可

完整代码：

MainDlg.h

// MainDlg.h : interface of the CMainDlg class
//
/////////////////////////////////////////////////////////////////////////////

#pragma once

class CMainDlg : public CDialogImpl<CMainDlg>, public CDoubleBufferImpl<CMainDlg>
{
public:
	enum { IDD = IDD_MAINDLG };

	BEGIN_MSG_MAP(CMainDlg)
		CHAIN_MSG_MAP(CDoubleBufferImpl<CMainDlg>)
		MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
		MESSAGE_HANDLER(WM_SIZE, OnSize)
		//MESSAGE_HANDLER(WM_PAINT, OnPaint)
		COMMAND_ID_HANDLER(IDCANCEL, OnCancel)
	END_MSG_MAP()

//  Handler prototypes (uncomment arguments if needed):
//	LRESULT MessageHandler(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
//	LRESULT CommandHandler(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
//	LRESULT NotifyHandler(int /*idCtrl*/, LPNMHDR /*pnmh*/, BOOL& /*bHandled*/)

	LRESULT OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
	LRESULT OnSize(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
	LRESULT OnCancel(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/);
	//LRESULT OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
	void DoPaint(CDCHandle dc);
};

MainDlg.cpp

// MainDlg.cpp : implementation of the CMainDlg class
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "resource.h"
#include "MainDlg.h"
#include <atlimage.h>
#include <time.h>
#include <gdiplus.h>
#pragma comment (lib,"Gdiplus.lib")
using namespace Gdiplus;
ULONG_PTR gdiplusToken;

LRESULT CMainDlg::OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	// center the dialog on the screen
	CenterWindow();

	// set icons
	HICON hIcon = AtlLoadIconImage(IDR_MAINFRAME, LR_DEFAULTCOLOR, ::GetSystemMetrics(SM_CXICON), ::GetSystemMetrics(SM_CYICON));
	SetIcon(hIcon, TRUE);
	HICON hIconSmall = AtlLoadIconImage(IDR_MAINFRAME, LR_DEFAULTCOLOR, ::GetSystemMetrics(SM_CXSMICON), ::GetSystemMetrics(SM_CYSMICON));
	SetIcon(hIconSmall, FALSE);

	GdiplusStartupInput gdiplusStartupInput;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

	return TRUE;
}

LRESULT CMainDlg::OnCancel(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
	EndDialog(wID);
	GdiplusShutdown(gdiplusToken);
	return 0;
}

//LRESULT CMainDlg::OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
//{
/*
	srand((unsigned)time(NULL));
	CPaintDC dc(this->m_hWnd);
	CBrush brush;
	CRect rect;
	GetClientRect(&rect);
	InvalidateRect(&rect, FALSE);
	brush.CreateSolidBrush(RGB(rand() % 255, rand() % 255, rand() % 255));
	dc.FillRect(&rect, brush);
*/

	//RECT rect;
	//获得客户区坐标
	//GetClientRect(&rect);
	//Graphics作图对象
	//Graphics g(m_hWnd);

	//画线
	/*
	Pen pen(Color(255, 0, 0, 0), 15);
	g.DrawLine(&pen, rect.left, rect.top, rect.right, rect.bottom);
	g.DrawLine(&pen, rect.left, rect.bottom, rect.right, rect.top);
	*/

	//画字符串
	/*
	SolidBrush brush(Color(255, 0, 0, 255));
	FontFamily fontFamily(TEXT("Times New Roman"));
	Font font(&fontFamily, 24, FontStyleRegular, UnitPixel);
	PointF pt(10.0f, 10.0f);
	g.DrawString(L"Hello World", -1, &font, pt, &brush);
	*/

	//画矩形
	/*
	Pen pen(Color(255, 0, 255, 0));
	while (rect.left < rect.right && rect.top < rect.bottom)
	{
		g.DrawRectangle(&pen, rect.left, rect.top, rect.right, rect.bottom);
		rect.left += 5;
		rect.top += 5;
		rect.right -= 10;
		rect.bottom -= 10;
	}
	*/

	//填充矩形
	/*
	SolidBrush brush(Color(255, 0, 255, 0));
	brush.SetColor(Color(255, 0, 0, 255));
	g.FillRectangle(&brush, rect.left, rect.top, rect.right, rect.bottom);
	*/
	//Image img(L"ing.png");
	//g.DrawImage(&img, rect.left, rect.top, rect.right, rect.bottom);

	//return TRUE;
//}

void CMainDlg::DoPaint(CDCHandle dc)
{
	RECT rect;
	GetClientRect(&rect);
	//Graphics g(m_hWnd);
	//Graphics g(dc.m_hDC);
	Graphics g(dc);

	Image img(L"forever.bmp");
	g.DrawImage(&img, rect.left, rect.top, rect.right, rect.bottom);
}

LRESULT CMainDlg::OnSize(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	RedrawWindow();
	return TRUE;
}

copy /b src.png + src.rar dest.png

完整代码将上面图片保存本地，改为rar格式即可获得