用API獲取到圖標，然后畫在自己的窗體內
模擬window桌面實現 收藏
正在開發中的游戲有個全屏功能--可以在window桌面背景上運行，就像一些視頻播放器在桌面背景上播放一樣的，花了個上午整了個Demo放出來留個紀念。
實現功能：顯示圖標，雙擊圖標執行相應的程序，右擊圖標彈出該圖標對應得菜單，點擊非圖標區則彈出桌面菜單。需要完整工程可以點此下載：DesktopWindow.rar。程序效果圖如下：
?
?在這個程序里，定義了一個XShellItem的數據結構，保持桌面圖標的iten id(ITEMIDLiST)，圖標以及文字圖標。
??? struct XShellItem ...{
??????? ITEMIDLIST*???? itemId;
??????? int x;
??????? int y;
??????? int w;
??????? int h;
??????? int nameX;
??????? int nameY;
??????? int nameW;
??????? int nameH;
??????? BOOL hit;
??????? CStringW name;
??????? Bitmap*???? icon;
??????? Bitmap*???? nameIcon;
??????? XShellItem()
??????? :
??????? itemId(NULL),
??????? x(0),
??????? y(0),
??????? w(0),
??????? h(0),
??????? nameX(0),
??????? nameY(0),
??????? nameW(0),
??????? nameH(0),
??????? name(L""),
??????? hit(FALSE),
??????? icon(NULL),
??????? nameIcon(NULL) ...{
??????? }
??????? ~XShellItem() ...{
??????? }
??? };
然后定義一個數組CAtlArray<XShellItem> itemArray;用來保存所有桌面圖標對象，在InitShellFolder()中對它進行初始化：
??? // 獲取桌面圖標的相關數據
??? BOOL InitShellFolder()
??? ...{
??????? HRESULT hRslt = SHGetDesktopFolder(&folder);
??????? if (FAILED(hRslt)) ...{
??????????? return FALSE;
??????? }
??????? CComPtr<IEnumIDList> ids;
??????? hRslt = folder->EnumObjects(0, SHCONTF_FOLDERS | SHCONTF_NONFOLDERS, &ids);
??????? if (FAILED(hRslt)) ...{
??????????? return FALSE;
??????? }
??????? CAtlList<XShellItem> items;
??????? for (;;) ...{
??????????? ITEMIDLIST*???? id = 0;
??????????? ULONG cIds = 0;
??????????? hRslt = ids->Next(1, &id, &cIds);
??????????? if (hRslt != S_OK) ...{
??????????????? break;
??????????? }
??????????? CStringW name;
??????????? STRRET str = ...{ 0};
??????????? hRslt = folder->GetDisplayNameOf(id, SHGDN_NORMAL | SHGDN_INFOLDER, &str);
??????????? if (SUCCEEDED(hRslt)) ...{
??????????????? LPWSTR pname = 0;
??????????????? StrRetToStrW(&str, id, &pname);
??????????????? name = pname;
??????????????? CoTaskMemFree(pname);
??????????? }
??????????? XShellItem item;
??????????? item.itemId = id;
??????????? item.name = name;
??????????? items.AddTail(item);
??????? }
??????? SIZE_T iItem = 0;
??????? SIZE_T cItems = items.GetCount();
??????? itemArray.SetCount(cItems);
??????? POSITION pos = items.GetHeadPosition();
??????? while (pos != 0) ...{
??????????? XShellItem&???? si = items.GetNext(pos);
??????????? itemArray[iItem] = si;
??????????? iItem++;
??????? }
??????? HDC hDC = CreateCompatibleDC(0);
??????? Graphics g(hDC);
??????? g.Clear(Color(0, 0, 0, 0));
??????? ICONMETRICS im = ...{ 0};
??????? im.cbSize = sizeof(im);
??????? SystemParametersInfo(SPI_GETICONMETRICS, sizeof(im), &im, 0);
??????? SolidBrush br_t(Color(255, 255, 255));
??????? Font font_i(hDC, &(im.lfFont));
??????? float fcy = font_i.GetHeight(&g) * 2 + 2;
??????? DeleteDC(hDC);
??????? Gdiplus::StringFormat sf(Gdiplus::StringFormat::GenericTypographic());
??????? sf.SetAlignment(Gdiplus::StringAlignmentCenter);
??????? sf.SetTrimming(Gdiplus::StringTrimmingEllipsisWord);
??????? iconSpacingWidth = im.iHorzSpacing + OFFSET_WIDTH;
??????? iconSpacingHeight = im.iVertSpacing + OFFSET_HEIGHT;
??????? int iconWidth = GetSystemMetrics(SM_CXICON);
??????? int iconHeight = GetSystemMetrics(SM_CYICON);
??????? for (SIZE_T i = 0; i < cItems; i++) ...{
??????????? XShellItem&???? item = itemArray[i];
??????????? // SHGetFileInfo
??????????? HICON hIcon = 0;
??????????? HIMAGELIST hImgList;
??????????? SHFILEINFO stSHFileInfo;
??????????? CImageList cImgList;
??????????? // 獲取圖標
??????????? hImgList = (HIMAGELIST)::SHGetFileInfo(
??????????????????? (LPCWSTR) item.itemId,
??????????????????? 0,
??????????????????? &stSHFileInfo,
??????????????????? sizeof(SHFILEINFO),
??????????????????? SHGFI_PIDL | SHGFI_ICON | SHGFI_LARGEICON | SHGFI_SYSICONINDEX);
??????????? // DIBSection 8bit
??????????? BITMAPINFO bmi;
??????????? BITMAPINFOHEADER&? bmih = bmi.bmiHeader;
??????????? bmih.biSize = sizeof(bmih);
??????????? bmih.biWidth = ICON_WIDTH;
??????????? bmih.biHeight = -ICON_HEIGHT;??? // BMP反轉
??????????? bmih.biPlanes = 1;
??????????? bmih.biBitCount = 32;
??????????? bmih.biCompression = BI_RGB;
??????????? bmih.biSizeImage = 0;
??????????? bmih.biXPelsPerMeter = 0;
??????????? bmih.biYPelsPerMeter = 0;
??????????? bmih.biClrUsed = 0;
??????????? bmih.biClrImportant = 0;
??????????? HDC memDC = CreateCompatibleDC(0);
??????????? void*? pDib = 0;
??????????? HBITMAP hBmp = CreateDIBSection(memDC, &bmi, DIB_RGB_COLORS, &pDib, 0, 0);
??????????? GdiFlush();
??????????? HGDIOBJ old = SelectObject(memDC, hBmp);
??????????? // ImageList_Draw WindowsXP
??????????? ImageList_SetBkColor(hImgList, 0x0);
??????????? ImageList_Draw(hImgList, stSHFileInfo.iIcon, memDC, 0, 0, ILD_NORMAL);
??????????? SelectObject(memDC, old);
??????????? DeleteDC(memDC);
??????????? cImgList.Attach(hImgList);
??????????? hIcon = cImgList.ExtractIcon(stSHFileInfo.iIcon);
??????????? cImgList.Detach();
??????????? if (hIcon != 0) ...{
??????????????? // Bitmap::FromHICON 0~255
??????????????? item.icon = Bitmap::FromHICON(hIcon);
??????????????? item.w = iconWidth;
??????????????? item.h = iconHeight;
??????????????? Gdiplus::RectF rc(float(2), float(2), float(iconSpacingWidth - 4), fcy);
??????????????? Gdiplus::Bitmap * nameIcon = new Bitmap(NAME_WIDTH, NAME_HEIGHT, &g);
??????????????? Gdiplus::Graphics * g2 = Gdiplus::Graphics::FromImage(nameIcon);
??????????????? g2->Clear(Gdiplus::Color(Gdiplus::ARGB(0)));
??????????????? g2->DrawString(item.name, item.name.GetLength(), &font_i, rc, &sf, &br_t);
??????????????? item.nameIcon = nameIcon;
??????????????? item.nameW = NAME_WIDTH;
??????????????? item.nameH = NAME_HEIGHT;
??????????????? delete g2;
??????????? }
??????????? DestroyIcon(hIcon);
??????????? DeleteObject(hBmp);
??????????? DestroyIcon(stSHFileInfo.hIcon);
??????? }
??????? return TRUE;
??? }
注意這里面并沒有設置圖標對象的位置，因為當窗口改變大小的時候，相應地也要調整圖標的描繪位置，所以圖標位置是在SetShellItemPosition()中動態調整的.
??? // 根據窗口大小設置圖標位置
??? void SetShellItemPosition()
??? ...{
??????? int iconWidth = GetSystemMetrics(SM_CXICON);
??????? int iconHeight = GetSystemMetrics(SM_CYICON);
??????? static const int OFFSET_Y = 20;
??????? int x = 0;
??????? int y = OFFSET_Y;
??????? SIZE_T cItems = itemArray.GetCount();
??????? for (SIZE_T i = 0; i < cItems; i++) ...{
??????????? XShellItem&???? item = itemArray[i];
??????????? if (item.icon) ...{
??????????????? item.x = x + (iconSpacingWidth - iconWidth) / 2;
??????????????? item.y = y;
??????????? }
??????????? if (item.nameIcon) ...{
??????????????? item.nameX = x;
??????????????? item.nameY = y + iconHeight + 2;
??????????? }
??????????? WTL::CRect rect;
??????????? GetClientRect(&rect);
??????????? y += iconSpacingHeight;
??????????? if (y + iconSpacingHeight >= rect.bottom) ...{
??????????????? x += iconSpacingWidth;
??????????????? y = OFFSET_Y;
??????????? }
??????? }
??? }
描繪圖標就很簡單了，呵呵，不貼了，下面來說說彈出圖標菜單，執行圖標對應的程序以及彈出桌面菜單。
執行圖標對應的程序，需要以先前保持的圖標itemid作為參數，代碼如下：
??? void RunShellItem(ITEMIDLIST* pIID)
??? ...{
??????? SHELLEXECUTEINFO info;
??????? info.cbSize = sizeof(SHELLEXECUTEINFO);
??????? info.fMask = SEE_MASK_INVOKEIDLIST;
??????? info.hwnd = m_hWnd;
??????? info.lpVerb = NULL;
??????? info.lpFile = NULL;
??????? info.lpParameters = NULL;
??????? info.lpDirectory = NULL;
??????? info.nShow = SW_SHOWNORMAL;
??????? info.hInstApp = NULL;
??????? info.lpIDList = pIID;
??????? ShellExecuteEx(&info);
??? }
彈出桌面菜單的代碼如下：
??? // 桌面菜單
??? void DesktopMenu()
??? ...{
??????? HWND program = FindWindowEx(0, 0, _T("Progman"), _T("Program Manager"));
??????? HWND view = FindWindowEx(program, 0, _T("SHELLDLL_DefView"), 0);
??????? //HWND list = FindWindowEx(view, 0, _T("SysListView32"), 0);
??????? ::SetForegroundWindow(view);
??????? POINT pt;
??????? GetCursorPos(&pt);
??????? LPARAM lp = pt.y << 16 | (pt.x - 32);
??????? ::PostMessage(view, WM_LBUTTONDOWN, 0, lp);
??????? ::PostMessage(view, WM_RBUTTONUP, 0, lp);
??? }
彈出圖標菜單的代碼如下，這里定義了兩個全局的IContextMenu對象：
static IContextMenu2*? g_pIContext2 = NULL;
static IContextMenu3*? g_pIContext3 = NULL;
以便在消息回調函數中使用。具體代碼如下：
??? // 圖標菜單
??? void RightMenu(ITEMIDLIST* pIID)
??? ...{
??????? HWND hwnd = m_hWnd;
??????? LPCONTEXTMENU pContextMenu = NULL;
??????? LPCONTEXTMENU pCtxMenuTemp = NULL;
??????? g_pIContext2 = NULL;
??????? g_pIContext3 = NULL;
??????? int menuType = 0;
??????? HRESULT hRslt = folder->GetUIObjectOf(
??????????????? hwnd,
??????????????? 1,
??????????????? (LPCITEMIDLIST*) &(pIID),
??????????????? IID_IContextMenu,
??????????????? 0,
??????????????? (void**) &pCtxMenuTemp);
??????? if (FAILED(hRslt)) ...{
??????????? return;
??????? }
??????? POINT pt;
??????? GetCursorPos(&pt);
??????? if (pCtxMenuTemp->QueryInterface(IID_IContextMenu3, (void**) &pContextMenu) == NOERROR) ...{
??????????? menuType = 3;
??????? }
??????? else if (pCtxMenuTemp->QueryInterface(IID_IContextMenu2, (void**) &pContextMenu) == NOERROR) ...{
??????????? menuType = 2;
??????? }
??????? if (pContextMenu) ...{
??????????? pCtxMenuTemp->Release();
??????? }
??????? else ...{
??????????? pContextMenu = pCtxMenuTemp;
??????????? menuType = 1;
??????? }
??????? if (menuType == 0) ...{
??????????? return;
??????? }
??????? HMENU hMenu = CreatePopupMenu();
??????? hRslt = pContextMenu->QueryContextMenu(hMenu, 0, 1, 0x7fff, CMF_NORMAL | CMF_EXPLORE);
??????? if (FAILED(hRslt)) ...{
??????????? return;
??????? }
#ifndef _WIN64
??? #pragma warning(disable : 4244 4311)
#endif
??????? // subclass window
??????? WNDPROC oldWndProc = NULL;
??????? if (menuType > 1) ...{
??????????? // only subclass if it is IID_IContextMenu2 or IID_IContextMenu3
??????????? oldWndProc = (WNDPROC) SetWindowLongPtr(GWL_WNDPROC, (LONG) HookWndProc);
??????????? if (menuType == 2) ...{
??????????????? g_pIContext2 = (LPCONTEXTMENU2) pContextMenu;
??????????? }
??????????? else ...{
??????????????? g_pIContext3 = (LPCONTEXTMENU3) pContextMenu;
??????????? }
??????? }
??????? else ...{
??????????? oldWndProc = NULL;
??????? }
??????? int cmd = ::TrackPopupMenu(
??????????????? hMenu,
??????????????? TPM_LEFTALIGN | TPM_BOTTOMALIGN | TPM_RETURNCMD | TPM_LEFTBUTTON,
??????????????? pt.x,
??????????????? pt.y,
??????????????? 0,
??????????????? hwnd,
??????????????? 0);
??????? // unsubclass
??????? if (oldWndProc) ...{
??????????? SetWindowLongPtr(GWL_WNDPROC, (LONG) oldWndProc);
??????? }
#ifndef _WIN64
??? #pragma warning(default : 4244 4311)
#endif
??????? if (cmd != 0) ...{
??????????? CMINVOKECOMMANDINFO ci = ...{ 0};
??????????? ci.cbSize = sizeof(CMINVOKECOMMANDINFO);
??????????? ci.hwnd = hwnd;
??????????? ci.lpVerb = (LPCSTR) MAKEINTRESOURCE(cmd - 1);
??????????? ci.nShow = SW_SHOWNORMAL;
??????????? pContextMenu->InvokeCommand(&ci);
??????? }
??????? pContextMenu->Release();
??????? g_pIContext2 = NULL;
??????? g_pIContext3 = NULL;
??????? ::DestroyMenu(hMenu);
??? }
??? static LRESULT CALLBACK HookWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
??? ...{
??????? switch (message) ...{
??????? case WM_MENUCHAR:??? // only supported by IContextMenu3
??????????? if (g_pIContext3) ...{
??????????????? LRESULT lResult = 0;
??????????????? g_pIContext3->HandleMenuMsg2(message, wParam, lParam, &lResult);
??????????????? return(lResult);
??????????? }
??????????? break;
??????? case WM_DRAWITEM:
??????? case WM_MEASUREITEM:
??????????? if (wParam) ...{
??????????????? break;??? // if wParam != 0 then the message is not menu-related
??????????? }
??????? case WM_INITMENUPOPUP:
??????????? if (g_pIContext2) ...{
??????????????? g_pIContext2->HandleMenuMsg(message, wParam, lParam);
??????????? }
??????????? else ...{
??????????????? g_pIContext3->HandleMenuMsg(message, wParam, lParam);
??????????? }
??????????? return(message == WM_INITMENUPOPUP ? 0 : TRUE);
??????????? break;
??????? default:
??????????? break;
??????? }
??????? return ::CallWindowProc((WNDPROC) GetProp(hWnd, TEXT("oldWndProc")), hWnd, message, wParam, lParam);
??? }?
本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/lzxxteam/archive/2008/03/04/2147500.aspx