请教关于MFC下使用aero毛玻璃效果的问题

[supercllc]

最近在使用aero毛玻璃效果，遇到不能理解的问题，希望能够得到解答

重现步骤
1、新建一MFC对话框程序，使用多字节字符集
2、在主窗口CPP中添加

#include <dwmapi.h> 
#pragma comment (lib , "dwmapi.lib" ) 

在OnInitDialog中添加

MARGINS margins = {-1};
DwmExtendFrameIntoClientArea(m_hWnd, &margins);

将OnPaint函数修改为画黑色背景

void Ctestaero4Dlg::OnPaint()
{
	CPaintDC dc(this); 
	CRect rc;
	GetClientRect(&rc);
	dc.FillSolidRect(rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top, RGB(0,0,0));
	CDialogEx::OnPaint();	
}

这时编译运行，窗口中的确定和取消按钮显示是不正常的
为了解决这个问题，再进行如下步骤
3、从CButton派生CMyButton类，添加link库

#pragma comment (lib , "UxTheme.lib" ) 

4、给确定按钮添加变量，类型为CMyButton
5、CMyButton中，响应WM_PAINT，重写OnPaint函数，重画按钮

void CMyButton::OnPaint()
{
	PAINTSTRUCT ps;
	HDC hdc = ::BeginPaint(m_hWnd, &ps);
	if(hdc)
	{
		LONG_PTR dwStyle = GetWindowLongPtr(m_hWnd, GWL_STYLE);
		LONG_PTR dwButtonStyle = LOWORD(dwStyle);
		LONG_PTR dwButtonType = dwButtonStyle&0xF;
		CRect rcClient;
		VERIFY(::GetClientRect(m_hWnd, &rcClient));

		if(BS_PUSHBUTTON==dwButtonType || BS_DEFPUSHBUTTON==dwButtonType)
		{
			HTHEME hTheme = OpenThemeData(m_hWnd, L"Button");
			if(hTheme)
			{
				HDC hdcPaint = NULL;
				BP_PAINTPARAMS params = { sizeof(BP_PAINTPARAMS) };
				params.dwFlags        = BPPF_ERASE;
				HPAINTBUFFER hBufferedPaint = BeginBufferedPaint(hdc, &rcClient, BPBF_TOPDOWNDIB, ¶ms, &hdcPaint);
				if (hdcPaint)
				{
					VERIFY(PatBlt(hdcPaint, 0, 0, rcClient.Width(), rcClient.Height(), BLACKNESS));

					VERIFY(S_OK==BufferedPaintSetAlpha(hBufferedPaint, &ps.rcPaint, 0x00));

					LRESULT dwCheckState = ::SendMessage(m_hWnd, BM_GETCHECK, 0, NULL);
					POINT pt;
					RECT rc;
					::GetWindowRect(m_hWnd, &rc);
					GetCursorPos(&pt);
					BOOL bHot = PtInRect(&rc, pt);
					BOOL bFocus = ::GetFocus()==m_hWnd;
					int iPartId = BP_PUSHBUTTON;

					if(dwButtonStyle==BS_RADIOBUTTON || dwButtonStyle==BS_AUTORADIOBUTTON)
						iPartId = BP_RADIOBUTTON;


					int iState;

					iState = PBS_NORMAL;
					if (dwStyle&WS_DISABLED)
						iState = PBS_DISABLED;
					else
					{
						if(dwStyle&BS_DEFPUSHBUTTON)
							iState = PBS_DEFAULTED;

						if(::GetCapture()==m_hWnd && bHot)
							iState = PBS_PRESSED;
						else if (::GetCapture()==m_hWnd || bHot)
							iState = PBS_HOT;
					}

					RECT rcPaint = rcClient;
					VERIFY(S_OK==DrawThemeBackground(hTheme, hdcPaint, iPartId, iState, &rcPaint, NULL));


					VERIFY(S_OK==GetThemeBackgroundContentRect(hTheme, hdcPaint, iPartId, iState, &rcPaint, &rc));


					DTTOPTS DttOpts = {sizeof(DTTOPTS)};
					DttOpts.dwFlags = DTT_COMPOSITED | DTT_GLOWSIZE;
					DttOpts.crText   = RGB(255, 255, 255);
					DttOpts.iGlowSize = 12; // Default value
					
					HFONT hFontOld = (HFONT)::SendMessage(m_hWnd, WM_GETFONT, 0L, NULL);
					if(hFontOld)
						hFontOld = (HFONT) SelectObject(hdcPaint, hFontOld);
					int iLen = ::GetWindowTextLength(m_hWnd);

					if(iLen)
					{
						iLen+=5;
						LPWSTR szText = (LPWSTR)LocalAlloc(LPTR, sizeof(WCHAR)*iLen);
						if(szText)
						{
							iLen = ::GetWindowTextW(m_hWnd, szText, iLen);
							if(iLen)
							{
								DWORD dwFlags = DT_SINGLELINE | DT_CENTER | DT_VCENTER;
								VERIFY(S_OK==DrawThemeTextEx(hTheme, hdcPaint,
									iPartId, iState, szText, -1, dwFlags, &rc, &DttOpts));
							}

							VERIFY(!LocalFree(szText));
						}
					}

					if (hFontOld)
					{
						SelectObject(hdcPaint, hFontOld);
						hFontOld    = NULL;
					}

					VERIFY(S_OK==EndBufferedPaint(hBufferedPaint, TRUE));
				}
				VERIFY(S_OK==CloseThemeData(hTheme));
			}
		}
	}

	::EndPaint(m_hWnd, &ps);
}

这时问题来了，工程字符集选为多字节，按下确定按钮时，样式就不对了
但是如果是unicode字符集，按下确定时，样式正常

不知道这是什么原因，谁能给个解释吗

附：百度网盘中示例工程代码(win7,vs2010)
http://pan.baidu.com/s/1sjFL1b3

代码主要参考：
[1] http://blog.csdn.net/cometnet/article/details/6547504
[2] tortoiseSVN源码

[Evankaka]

工程字符集改为未设置的看看

[supercllc]

自己顶一下，防止沉了

[supercllc]

和设为多字节一样，有问题

引用 2 楼 Evankaka 的回复:

工程字符集改为未设置的看看

[向立天]

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