MFC图片处理类CPicture

//////////////////////////////////////////////////////////////// // If this code works, it was written by Paul DiLascia. // If not, I don't know who wrote it. // Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000 too. // Set tabsize = 3 in your editor. // #include "StdAfx.h" #include "Picture.h" #include <atlbase.h> #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif //////////////////////////////////////////////////////////////// // CPicture implementation // CPicture::CPicture() { } CPicture::~CPicture() { } ////////////////// // Load from resource. Looks for "IMAGE" type. // BOOL CPicture::Load(UINT nIDRes) { // find resource in resource file HINSTANCE hInst = AfxGetResourceHandle(); HRSRC hRsrc = ::FindResource(hInst, MAKEINTRESOURCE(nIDRes), "IMAGE"); // type if (!hRsrc) return FALSE; // load resource into memory DWORD len = SizeofResource(hInst, hRsrc); BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc); if (!lpRsrc) return FALSE; // create memory file and load it CMemFile file(lpRsrc, len); BOOL bRet = Load(file); FreeResource(hRsrc); GlobalFree(lpRsrc); return bRet; } ////////////////// // Load from path name. // BOOL CPicture::Load(LPCTSTR pszPathName) { CFile file; if (!file.Open(pszPathName, CFile::modeRead|CFile::shareDenyWrite)) { return FALSE; } BOOL bRet = Load(file); file.Close(); return bRet; } ////////////////// // Load from CFile // BOOL CPicture::Load(CFile& file) { CArchive ar(&file, CArchive::load | CArchive::bNoFlushOnDelete); return Load(ar); } ////////////////// // Load from archive--create stream and load from stream. // BOOL CPicture::Load(CArchive& ar) { CArchiveStream arcstream(&ar); return Load((IStream*)&arcstream); } // LOAD FROM BUFFER BOOL CPicture::Load(char *pBuffer, int nSize) //============================================================================= { BOOL bResult = FALSE; HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, nSize); if(hGlobal == NULL) { AfxMessageBox("Can not allocate enough memory\t"); return(FALSE); } void* pData = GlobalLock(hGlobal); memcpy(pData, pBuffer, nSize); GlobalUnlock(hGlobal); IStream* pStream = NULL; if(CreateStreamOnHGlobal(hGlobal, TRUE, &pStream) == S_OK) { Load(pStream); } FreeResource(hGlobal); // 16Bit Windows Needs This (32Bit - Automatic Release) return(bResult); } ////////////////// // Load from stream (IStream). This is the one that really does it: call // OleLoadPicture to do the work. // BOOL CPicture::Load(IStream* pstm) { Free(); HRESULT hr = OleLoadPicture(pstm, 0, FALSE, IID_IPicture, (void**)&m_spIPicture); ASSERT(SUCCEEDED(hr) && m_spIPicture); return TRUE; } ////////////////// // Render to device context. Covert to HIMETRIC for IPicture. // BOOL CPicture::Render(CDC* pDC, CRect rc, LPCRECT prcMFBounds) const { ASSERT(pDC); if (rc.IsRectNull()) { CSize sz = GetImageSize(pDC); rc.right = sz.cx; rc.bottom = sz.cy; } long hmWidth,hmHeight; // HIMETRIC units GetHIMETRICSize(hmWidth, hmHeight); m_spIPicture->Render(*pDC, rc.left, rc.top, rc.Width(), rc.Height(), 0, hmHeight, hmWidth, -hmHeight, prcMFBounds); return TRUE; } ////////////////// // Get image size in pixels. Converts from HIMETRIC to device coords. // CSize CPicture::GetImageSize(CDC* pDC) const { if (!m_spIPicture) return CSize(0,0); LONG hmWidth, hmHeight; // HIMETRIC units m_spIPicture->get_Width(&hmWidth); m_spIPicture->get_Height(&hmHeight); CSize sz(hmWidth,hmHeight); if (pDC==NULL) { CWindowDC dc(NULL); dc.HIMETRICtoDP(&sz); // convert to pixels } else { pDC->HIMETRICtoDP(&sz); } return sz; }