Engine的MapControl控件在MFC下非对话框中的使用.docx

Engine的MapControl控件在MFC下View中的使用王红亮Esri中国（北京）有限公司2010/01/271. 引言ArcGIS Engine的控件，如MapControl，在MFC框架下非Dialog模板，如Document/View/Frame结构下能不能使用，如何使用。按照我们以往的经验，此时的MapControl应该作为子窗口，继承自CWnd，并实现Create()成员函数，便能达到运行时创建的要求。那么我们要解决的问题也就明确了：创建一个继承自CWnd类，并对MapCotrol进行包装。本示例开发环境选用Visual Sudio 2008（Version 9.0.30729.1 SP，Visual Sudio 2010也有对应的工程和解决方案），语言采用C+，MFC技术；ArcEngine 10.0产品；Win7（64bit）操作系统。程序运行的效果如下：2. CMapControl窗口类的实现/*MapControl.h*/#pragma once/ ArcGIS Engine MapControl的封装类/ 作者：王红亮/单位：Esri中国（北京）有限公司/日期：/01/26/说明：本程序可自由引用、转载、发布，但请保留作者信息/ CMapControl wrapper classclass CMapControl : public CWndprotected:DECLARE_DYNCREATE(CMapControl)public:CLSID const& GetClsid()static CLSID const clsid= 0xC552EA94, 0x6FBB, 0x11d5, 0xA9, 0xC1, 0x0, 0x10, 0x4B, 0xB6, 0xFC, 0x1C ;return clsid;virtual BOOL Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle,const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext = NULL) return CreateControl(GetClsid(), lpszWindowName, dwStyle, rect, pParentWnd, nID); BOOL Create(LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CFile* pPersist = NULL, BOOL bStorage = FALSE,BSTR bstrLicKey = NULL) return CreateControl(GetClsid(), lpszWindowName, dwStyle, rect, pParentWnd, nID,pPersist, bStorage, bstrLicKey); / default bAddRef is false because you dont need to addref/ when passing result to Feature.Attach();LPDISPATCH GetDispatch(BOOL bAddRef=FALSE);/ Attributespublic:/ Operationspublic:;/*MapControl.cpp*/#include stdafx.h#include MapControl.h/ CMapControl wrapper classIMPLEMENT_DYNCREATE(CMapControl, CWnd)LPDISPATCH CMapControl:GetDispatch(BOOL bAddRef)LPUNKNOWN pUnk = GetControlUnknown();LPDISPATCH pDispatch;if (pUnk != NULL) &SUCCEEDED(pUnk-QueryInterface(IID_IDispatch, (LPVOID*)&pDispatch) ASSERT(pDispatch != NULL);if (!bAddRef) pDispatch-Release();return pDispatch;return NULL;/ properties/operations说明：CMapControl窗口类实现的关键在于利用CreateControl(REFCLSID clsid, LPCTSTR pszWindowName,. )这个MFC中CWnd类的创建ActiveX控件的方法，其中参数clsid指ActiveX控件的GUID，每个ActiveX控件都有一个GUID。MFC对GUID数据结构作了如下的定义：typedef struct _GUID unsigned long Data1; unsigned short Data2; unsigned short Data3; unsigned char Data4 8 ; GUID;，通过OLE/COM Object Viewer（Visual Studio开发环境提供的工具），中的Type Libraries分支中的Esri Controls 10.0项内的coclass MapControl对象，很容易得到MapControl的GUID，C552EA94-6FBB-11D5-A9C1-00104BB6FC1C，于是我们把此ID依次填入GUID的数据结构中，便有了代码中的，static CLSID const clsid= 0xC552EA94, 0x6FBB, 0x11d5, 0xA9, 0xC1, 0x0, 0x10, 0x4B, 0xB6, 0xFC, 0x1C ;奥，原来是这样！3. CMapControl窗口类的使用在主视图类中，加入CMapControl类型的成员，及OnCreate()和OnSize()标准窗口消息的相应函数，如下：/AEViewTestView.h#include MapControl.hclass CAEViewTestView : public CView / 属性public:CAEViewTestDoc* GetDocument() const;CMapControl m_wndMap;/ 生成的消息映射函数protected:afx_msg void OnFilePrintPreview();afx_msg void OnRButtonUp(UINT nFlags, CPoint point);afx_msg void OnContextMenu(CWnd* pWnd, CPoint point);afx_msg int OnCreate(LPCREATESTRUCT lpcs);afx_msg void OnSize(UINT nType, int cx, int cy);DECLARE_MESSAGE_MAP();/AEViewTestView.cppBEGIN_MESSAGE_MAP(CAEViewTestView, CView)/ 标准打印命令ON_COMMAND(ID_FILE_PRINT, &CView:OnFilePrint)ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView:OnFilePrint)ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CAEViewTestView:OnFilePrintPreview)ON_WM_CREATE()ON_WM_SIZE()END_MESSAGE_MAP()/ CAEViewTestView 消息处理程序int CAEViewTestView:OnCreate(LPCREATESTRUCT lpcs)if(CView:OnCreate(lpcs) = -1)return -1;if(!m_wndMap.Create(NULL, WS_CHILD|WS_VISIBLE, CRect(0, 0, 100, 100), this, 10000)return -1;esriControls:IMapControl4Ptr pMapControl4;LPUNKNOWN lpUnknown = m_wndMap.GetControlUnknown();lpUnknown-QueryInterface(&pMapControl4);CString strMxd = _T(D:Program Files (x86)ArcGISTutorial DatausaUSA Base Map.mxd);pMapControl4-LoadMxFile(strMxd.AllocSysString();return 0;void CAEViewTest