enbitmap.cpp

换肤窗口也就是窗口内的基本元素及窗口外观会随着要求不断的变换风格。本实例中的窗口可以实现NeoStyle和XpStyle两种风格的互换。教你如何定制窗口框架、标题、边框等

// EnBitmap.cpp: implementation of the CEnBitmap class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "EnBitmap.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

const int HIMETRIC_INCH	= 2540;

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CEnBitmap::CEnBitmap()
{

}

CEnBitmap::~CEnBitmap()
{

}

BOOL CEnBitmap::LoadImage(UINT uIDRes, LPCTSTR szResourceType, HMODULE hInst, COLORREF crBack)
{
	ASSERT(m_hObject == NULL);      // only attach once, detach on destroy

	if (m_hObject != NULL)
		return FALSE;

	BYTE*	pBuff = NULL;
	int		nSize = 0;
	BOOL bResult = FALSE;

	// first call is to get buffer size
	if (GetResource(MAKEINTRESOURCE(uIDRes), szResourceType, hInst, 0, nSize))
	{
		if (nSize > 0)
		{
			pBuff = new BYTE[nSize];
			
			// this loads it
			if (GetResource(MAKEINTRESOURCE(uIDRes), szResourceType, hInst, pBuff, nSize))
			{
				IPicture* pPicture = LoadFromBuffer(pBuff, nSize);

				if (pPicture)
				{
					bResult = Attach(pPicture, crBack);
					pPicture->Release();
				}
			}
			
			delete [] pBuff;
		}
	}

	return bResult;
}

BOOL CEnBitmap::LoadImage(LPCTSTR szImagePath, COLORREF crBack)
{
	ASSERT(m_hObject == NULL);      // only attach once, detach on destroy

	if (m_hObject != NULL)
		return FALSE;

	BOOL bResult = FALSE;
	CFile			cFile;
	CFileException	e;
	
	if (cFile.Open(szImagePath, CFile::modeRead | CFile::typeBinary, &e))
	{
		int nSize = cFile.GetLength();

		BYTE* pBuff = new BYTE[nSize];
		
		if (cFile.Read(pBuff, nSize) > 0)
		{
			IPicture* pPicture = LoadFromBuffer(pBuff, nSize);
			
			if (pPicture)
			{
				bResult = Attach(pPicture, crBack);
				pPicture->Release();
			}
		}
		
		delete [] pBuff;
	}

	return bResult;
}

IPicture* CEnBitmap::LoadFromBuffer(BYTE* pBuff, int nSize)
{
	bool bResult = false;

	HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, nSize);
	void* pData = GlobalLock(hGlobal);
	memcpy(pData, pBuff, nSize);
	GlobalUnlock(hGlobal);

	IStream* pStream = NULL;
	IPicture* pPicture = NULL;

	if (CreateStreamOnHGlobal(hGlobal, TRUE, &pStream) == S_OK)
	{
		HRESULT hr = OleLoadPicture(pStream, nSize, FALSE, IID_IPicture, (LPVOID *)&pPicture);
		pStream->Release();
	}

	return pPicture; // caller releases
}

BOOL CEnBitmap::GetResource(LPCTSTR lpName, LPCTSTR lpType, HMODULE hInst, void* pResource, int& nBufSize)
{ 
	HRSRC		hResInfo;
	HANDLE		hRes;
	LPSTR		lpRes	= NULL; 
	int			nLen	= 0;
	bool		bResult	= FALSE;

	// Find the resource
	hResInfo = FindResource(hInst, lpName, lpType);

	if (hResInfo == NULL) 
		return false;

	// Load the resource
	hRes = LoadResource(hInst, hResInfo);

	if (hRes == NULL) 
		return false;

	// Lock the resource
	lpRes = (char*)LockResource(hRes);

	if (lpRes != NULL)
	{ 
		if (pResource == NULL)
		{
			nBufSize = SizeofResource(hInst, hResInfo);
			bResult = true;
		}
		else
		{
			if (nBufSize >= (int)SizeofResource(hInst, hResInfo))
			{
				memcpy(pResource, lpRes, nBufSize);
				bResult = true;
			}
		} 

		UnlockResource(hRes);  
	}

	// Free the resource
	FreeResource(hRes);

	return bResult;
}

BOOL CEnBitmap::Attach(IPicture* pPicture, COLORREF crBack)
{
	ASSERT(m_hObject == NULL);      // only attach once, detach on destroy

	if (m_hObject != NULL)
		return FALSE;

	ASSERT(pPicture);

	if (!pPicture)
		return FALSE;

	BOOL bResult = FALSE;

	CDC dcMem;
	CDC* pDC = CWnd::GetDesktopWindow()->GetDC();

	if (dcMem.CreateCompatibleDC(pDC))
	{
		long hmWidth;
		long hmHeight;

		pPicture->get_Width(&hmWidth);
		pPicture->get_Height(&hmHeight);
		
		int nWidth	= MulDiv(hmWidth,	pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH);
		int nHeight	= MulDiv(hmHeight,	pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH);

		CBitmap bmMem;

		if (bmMem.CreateCompatibleBitmap(pDC, nWidth, nHeight))
		{
			CBitmap* pOldBM = dcMem.SelectObject(&bmMem);

			if (crBack != -1)
				dcMem.FillSolidRect(0, 0, nWidth, nHeight, crBack);
			
			HRESULT hr = pPicture->Render(dcMem, 0, 0, nWidth, nHeight, 0, hmHeight, hmWidth, -hmHeight, NULL);
			dcMem.SelectObject(pOldBM);

			if (hr == S_OK)
				bResult = CBitmap::Attach(bmMem.Detach());
		}
	}

	CWnd::GetDesktopWindow()->ReleaseDC(pDC);

	return bResult;
}