HBITMAP,HICON,HCURSOR句柄的区别???

lianglp 2004-05-08 09:57:59

有谁知???

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zhangnanonnet 2004-05-08

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指向的结构不同

cvsuser 2004-05-08

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学习中·

薛定谔之死猫 2004-05-08

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学习

zhangnanonnet 2004-05-08

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nice question....

FengYuanMSFT 2004-05-08

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HBITMAP is a GDI handle.
HICON and HCURSOR are not GDI handles. They are USER handles.

转载同事的测试例子，也许大家可以看看 // MyFade.cpp : implementation file // #include "stdafx.h" #include "MyFade.h" #pragma warning(disable: 4201) #include #pragma comment(lib,"winmm.lib") #pragma warning(default: 4201) #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #define WC_FADEWND _T("FadeWnd") ///////////////////////////////////////////////////////////////////////////// // CMyFade CMyFade::CMyFade(CWnd* pParent) { // register the window WNDCLASS wndcls; HINSTANCE hInst = AfxGetInstanceHandle(); if (!(::GetClassInfo(hInst, WC_FADEWND, &wndcls))) { // otherwise we need to register a new class wndcls.style = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW; wndcls.lpfnWndProc = ::DefWindowProc; wndcls.cbClsExtra = 0; wndcls.cbWndExtra = 0; wndcls.hInstance = hInst; wndcls.hIcon = NULL; // no application icon wndcls.hCursor = AfxGetApp()->LoadStandardCursor(IDC_ARROW); wndcls.hbrBackground = NULL; // no background wndcls.lpszMenuName = NULL; // no manu application wndcls.lpszClassName = WC_FADEWND; if (!AfxRegisterClass(&wndcls)) AfxThrowResourceException(); } m_hBitmap = NULL; m_hNewBitmap = NULL; m_pWndLock = NULL; } CMyFade::~CMyFade() { if (m_hBitmap) { DeleteObject(m_hBitmap); m_hBitmap = NULL; } if (m_hNewBitmap) { DeleteObject(m_hNewBitmap); m_hNewBitmap = NULL; } if (m_pWndLock) { m_pWndLock->SetFocus(); } } BEGIN_MESSAGE_MAP(CMyFade, CWnd) //{{AFX_MSG_MAP(CMyFade) ON_WM_PAINT() ON_WM_TIMER() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CMyFade message handlers void CMyFade::FadeScreen(CWnd *pParent) { if(pParent) { CMyFade *pFade=new CMyFade(pParent); if(pFade) { pFade->Create(pParent, CRect(0, 0, 0, 0)); } } } void CMyFade::OnDraw(CDC* pDC) { CRect rc; GetWindowRect(rc); HDC hbmDC=CreateCompatibleDC(pDC->GetSafeHdc()); HBITMAP hOldbmp=(HBITMAP)::SelectObject(hbmDC, m_hNewBitmap); // 将屏幕位图再输入到屏幕上去 BitBlt(pDC->GetSafeHdc(), 0, 0, rc.Width(), rc.Height(), hbmDC, 0, 0, SRCCOPY); SelectObject(hbmDC, hOldbmp); DeleteObject(hbmDC); } void CMyFade::OnPaint() { CPaintDC dc(this); OnDraw(&dc); } HBITMAP CMyFade::CopyScreenToBitmap(LPRECT lpRect) { HDC hScrDC, hMemDC; // screen DC and memory DC int nX, nY, nX2, nY2; // coordinates of rectangle to grab int nWidth, nHeight; // DIB width and height int xScrn, yScrn; // screen resolution HGDIOBJ hOldBitmap, hBitmap; if (IsRectEmpty(lpRect)) return NULL; hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL); hMemDC = CreateCompatibleDC(hScrDC); xScrn = GetDeviceCaps(hScrDC, HORZRES); yScrn = GetDeviceCaps(hScrDC, VERTRES); nX = lpRect->left; nY = lpRect->top; nX2 = lpRect->right; nY2 = lpRect->bottom; if (nX < 0) nX = 0; if (nY < 0) nY = 0; if (nX2 > xScrn) nX2 = xScrn; if (nY2 > yScrn) nY2 = yScrn; nWidth = nX2 - nX; nHeight = nY2 - nY; hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight); hOldBitmap = SelectObject(hMemDC, hBitmap); // 将屏幕输入到内存DC里面去，再通过SelectObject到位图句柄里面 BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY); // 将刚刚得到到的屏幕位图置换出句柄 hBitmap=SelectObject(hMemDC, hOldBitmap); DeleteDC(hScrDC); DeleteDC(hMemDC); return (HBITMAP)hBitmap; } BOOL CMyFade::Create(CWnd *pParent, CRect rc) { if (!pParent || !IsWindow(pParent->GetSafeHwnd())) { MessageBox("error1"); return false; } CClientDC dcParent(pParent); if (dcParent.GetDeviceCaps(RASTERCAPS) & RC_PALETTE) { MessageBox("error2"); return FALSE; } GetDesktopWindow()->GetWindowRect(rc); CString szText; GetDesktopWindow()->GetWindowText(szText); if (!CWnd::CreateEx( 0, WC_FADEWND, szText, WS_POPUP | WS_CHILD | WS_VISIBLE, rc, pParent, NULL, NULL)) { MessageBox("error3"); return FALSE; } /* if(pParent!=GetDesktopWindow()) { m_pWndLock=pParent; m_pWndLock->EnableWindow(false); HRGN hRgn=CreateRectRgn(0, 0, 0, 0); int regiontype=m_pWndLock->GetWindowRgn(hRgn); if(regiontype!=ERROR) { MessageBox("error4"); SetWindowRgn(hRgn, false); } DeleteObject(hRgn); } */ m_hBitmap = CopyScreenToBitmap(rc); SetTimer(1, 2000, NULL); } ////////////////////////////////////////////////////////////////////////// // 核心函数，将屏幕变暗 HBITMAP CMyFade::FadeBitmap(HBITMAP hBmp, double dfTrans) { HBITMAP hRetBmp = NULL; if (hBmp) { HDC hBufferDC = CreateCompatibleDC(NULL); HGDIOBJ hPrevBufObject = SelectObject(hBufferDC, hBmp); HDC hDirectDC = CreateCompatibleDC(NULL); // DC for working if (hDirectDC) { BITMAP bm; GetObject(hBmp, sizeof(bm), &bm); BITMAPINFO bmInfo; ZeroMemory(&bmInfo,sizeof(bmInfo)); bmInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); bmInfo.bmiHeader.biWidth = bm.bmWidth; bmInfo.bmiHeader.biHeight = bm.bmHeight; bmInfo.bmiHeader.biPlanes = 1; bmInfo.bmiHeader.biBitCount = 32; UINT* ptPixels; HBITMAP hDirectBitmap = CreateDIBSection(hDirectDC, (BITMAPINFO*)&bmInfo, DIB_RGB_COLORS,(void**)&ptPixels, NULL, 0); if (hDirectBitmap) { // 将hDirectBitmap放入hDirectDC中处理 HGDIOBJ hPrevBufDirObject = SelectObject(hDirectDC, hDirectBitmap); // 当前将原hBmp即屏幕的所有像素写入到hDirectDC // 即需要对像素灰度处理的DC中 BitBlt(hDirectDC,0,0,bm.bmWidth,bm.bmHeight,hBufferDC,0,0,SRCCOPY); int iAlpha = (int)(255.0 * dfTrans / 100.0); int nSize = bm.bmWidth * bm.bmHeight; for (int i=0; i> 16; int iSrcG = ptPixels[i] & 0x0000ff00 >> 8; int iSrcB = ptPixels[i] & 0x000000ff; int iGrey = (iSrcR * 54 + iSrcG * 182 + iSrcB * 19) >> 8; COLORREF Col =iGrey ; //RGB(iGrey, iGrey, iGrey) ; ptPixels[i] = RGB( (GetBValue( Col ) * iAlpha + iSrcB * (255 - iAlpha)) >> 8, (GetGValue( Col ) * iAlpha + iSrcG * (255 - iAlpha)) >> 8, (GetRValue( Col ) * iAlpha + iSrcR * (255 - iAlpha)) >> 8 ); } SelectObject(hDirectDC,hPrevBufDirObject); hRetBmp = hDirectBitmap; } DeleteDC(hDirectDC); } SelectObject(hBufferDC, hPrevBufObject); DeleteDC(hBufferDC); } return hRetBmp; } static i=0; void CMyFade::OnTimer(UINT nIDEvent) { CWnd::OnTimer(nIDEvent); CClientDC dc(this); i+=2; if(i>100) { KillTimer(1); return; } DWORD dwStartCount = timeGetTime(); if(m_hNewBitmap) { DeleteObject(m_hNewBitmap); m_hNewBitmap = NULL; } m_hNewBitmap = FadeBitmap(m_hBitmap,(double)i); OnDraw(&dc); DWORD dwEndCount = timeGetTime(); // tick counter in milliseconds }

为什么本期是1.5？而不是二？今天我将会为将来的2作铺垫，因为本期将谈到的是一个非常重要的东西一一句柄句柄有什么重要的吗？那可是的！句柄是非常重要的东西，没有他我们的头文件windows.h根本没有办法运作！话不多说，我们进入正题吧！句柄 HINSTANCE 应用程序实例句柄 HWND 窗口句柄 HCURSOR 鼠标句柄 HICON 图标句柄 HBITMAP 位图句柄其实主要的句柄...

句柄类型说明 HWND 窗口句柄 HINSTANCE 当前实列句柄 HCURSOR 光标句柄 HFONT 字体句柄 HPEN 画笔句柄 HBRUSH 画刷句柄 HDC 设备环境句柄 HBITMAP 位图句柄 HICON 图标句柄 HMENU 菜单句柄 HFILE 文件句柄 ...

HWND：窗口句柄 HINSTANCE：当前实列句柄，代表应用程序载入的模块，win32系统下通常是被载入模块的线性地址。 HCURSOR：光标句柄 HFONT：字体句柄 HPEN：画笔句柄 HBRUSH：画刷句柄 HDC：设备环境句柄 HBITMAP：位图句柄 HICON：图标句柄 HMENU：菜单句柄 HFILE：文件句柄 ...

Windows程序中，有各种各样的资源（窗口、图标、光标），系统在创建这些资源的时候会为他们分配内存，并返回标识这些资源的标识号，即句柄HANDLE（ID）。图标句柄（HICON）、光标句柄（HCURSOR）、画刷句柄（HBRUSH）。为什么有个窗口对象还要窗口句柄呢？还有什么线程句柄，甚至还有控件ID和进程ID呢？MFC中的对象，比如应用程序对象，视图对象等，是对象就会占用

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