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得到MapControl控件消息事件的几种方法

分类： C/C++

2009-06-04 10:40:55

这里总结了获取事件的三种方法。

 

方法一

   该方法就是在窗体上添加控件MapControl，采用Microsoft Visual Studio开发环境添加消息影射。比如：

BEGIN_EVENTSINK_MAP(CDialogMapControl, CDialog)
 ON_EVENT(CDialogMapControl, MapControlID, 1, CDialogMapControl::OnMouseDownMapcontrol, VTS_I4 VTS_I4 VTS_I4 VTS_I4 VTS_R8 VTS_R8)
 ON_EVENT(CDialogMapControl, MapControlID, 3, CDialogMapControl::OnMouseMoveMapcontrol, VTS_I4 VTS_I4 VTS_I4 VTS_I4 VTS_R8 VTS_R8)
 ON_EVENT(CDialogMapControl, MapControlID, 2, CDialogMapControl::OnMouseUpMapcontrol, VTS_I4 VTS_I4 VTS_I4 VTS_I4 VTS_R8 VTS_R8)
 ON_EVENT(CDialogMapControl, MapControlID, 4, CDialogMapControl::OnDoubleClickMapControl, VTS_I4 VTS_I4 VTS_I4 VTS_I4 VTS_R8 VTS_R8)
 ON_EVENT(CDialogMapControl, MapControlID, 13, CDialogMapControl::OnKeyDownMapcontrol, VTS_I4 VTS_I4)
 ON_EVENT(CDialogMapControl, MapControlID, 14, CDialogMapControl::OnKeyUpMapcontrol, VTS_I4 VTS_I4)
END_EVENTSINK_MAP()

 

方法二

  该方法是继承IMapControlEvents2接口，比如下面代码：

class CMapControlEditor : public CComObjectRoot,
public IMapControlEvents2
{
public:
 CMapControlEditor();
 virtual ~CMapControlEditor();

 BEGIN_COM_MAP(CMapControlEditor)
  COM_INTERFACE_ENTRY(IMapControlEvents2)
 END_COM_MAP()
  
 STDMETHODIMP GetTypeInfoCount(UINT *) {
  return E_NOTIMPL;
 }
 STDMETHODIMP GetTypeInfo(UINT iTInfo,LCID lcid,ITypeInfo __RPC_FAR *__RPC_FAR *ppTInfo) {
  return E_NOTIMPL;
 }
 
 STDMETHODIMP GetIDsOfNames(REFIID riid,
  LPOLESTR __RPC_FAR *rgszNames,
  UINT cNames,
  LCID lcid,
  DISPID __RPC_FAR *rgDispId) {
  return E_NOTIMPL;
 }
 
 STDMETHODIMP Invoke(
  DISPID dispIdMember,
  REFIID riid,
  LCID lcid,
  WORD wFlags,
  DISPPARAMS __RPC_FAR *pDispParams,
  VARIANT __RPC_FAR *pVarResult,
  EXCEPINFO __RPC_FAR *pExcepInfo,
  UINT __RPC_FAR *puArgErr)
 {
  HRESULT hr;
  switch(dispIdMember) {
  case 0x1: // OnMouseDown
   if (pDispParams->cArgs != 6) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG button, shift, x, y, mapX, mapY;
    VariantInit(&button); 
    VariantInit(&shift);
    VariantInit(&x);
    VariantInit(&y);
    VariantInit(&mapX);
    VariantInit(&mapY);

    hr = VariantChangeTypeEx(&mapY, &(pDispParams->rgvarg[0]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&mapX, &(pDispParams->rgvarg[1]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&y, &(pDispParams->rgvarg[2]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&x, &(pDispParams->rgvarg[3]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&shift, &(pDispParams->rgvarg[4]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&button, &(pDispParams->rgvarg[5]), lcid, 0, VT_I4);

    OnMouseDown(button.lVal, shift.lVal, x.lVal, y.lVal, mapX.dblVal, mapY.dblVal);
   }
   break;

  case 0x2: // OnMouseUp
   if (pDispParams->cArgs != 6) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG button, shift, x, y, mapX, mapY;
    VariantInit(&button); 
    VariantInit(&shift);
    VariantInit(&x);
    VariantInit(&y);
    VariantInit(&mapX);
    VariantInit(&mapY);
    
    hr = VariantChangeTypeEx(&mapY, &(pDispParams->rgvarg[0]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&mapX, &(pDispParams->rgvarg[1]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&y, &(pDispParams->rgvarg[2]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&x, &(pDispParams->rgvarg[3]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&shift, &(pDispParams->rgvarg[4]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&button, &(pDispParams->rgvarg[5]), lcid, 0, VT_I4);
    
    OnMouseUp(button.lVal, shift.lVal, x.lVal, y.lVal, mapX.dblVal, mapY.dblVal);
   }
   break;

  case 0x3: // OnMouseMove
   if (pDispParams->cArgs != 6) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG button, shift, x, y, mapX, mapY;
    VariantInit(&button); 
    VariantInit(&shift);
    VariantInit(&x);
    VariantInit(&y);
    VariantInit(&mapX);
    VariantInit(&mapY);
    
    hr = VariantChangeTypeEx(&mapY, &(pDispParams->rgvarg[0]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&mapX, &(pDispParams->rgvarg[1]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&y, &(pDispParams->rgvarg[2]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&x, &(pDispParams->rgvarg[3]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&shift, &(pDispParams->rgvarg[4]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&button, &(pDispParams->rgvarg[5]), lcid, 0, VT_I4);
    
    OnMouseMove(button.lVal, shift.lVal, x.lVal, y.lVal, mapX.dblVal, mapY.dblVal);
   }
   break;

  case 0x4: // OnDoubleClick
   if (pDispParams->cArgs != 6) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG button, shift, x, y, mapX, mapY;
    VariantInit(&button); 
    VariantInit(&shift);
    VariantInit(&x);
    VariantInit(&y);
    VariantInit(&mapX);
    VariantInit(&mapY);
    
    hr = VariantChangeTypeEx(&mapY, &(pDispParams->rgvarg[0]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&mapX, &(pDispParams->rgvarg[1]), lcid, 0, VT_R8);
    hr = VariantChangeTypeEx(&y, &(pDispParams->rgvarg[2]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&x, &(pDispParams->rgvarg[3]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&shift, &(pDispParams->rgvarg[4]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&button, &(pDispParams->rgvarg[5]), lcid, 0, VT_I4);
    
    OnDoubleClick(button.lVal, shift.lVal, x.lVal, y.lVal, mapX.dblVal, mapY.dblVal);
   }
   break;

  case 0x5: // OnSelectionChanged
   OnSelectionChanged();
   break;

  case 0x6: // OnViewRefreshed
   if (pDispParams->cArgs != 1) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG viewDrawPhase;
    VariantInit(&viewDrawPhase);
    hr = VariantChangeTypeEx(&viewDrawPhase, &(pDispParams->rgvarg[2]), lcid, 0, VT_I4);
    OnViewRefreshed(pDispParams->rgvarg[3], viewDrawPhase.lVal, pDispParams->rgvarg[1], pDispParams->rgvarg[0]);
   }
   break;

  case 0x7: // OnBeforeScreenDraw
   if (pDispParams->cArgs != 1) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG hdc;
    VariantInit(&hdc);
    hr = VariantChangeTypeEx(&hdc, &(pDispParams->rgvarg[0]), lcid, 0, VT_I4);
    OnBeforeScreenDraw(hdc.lVal);
   }
   break;

  case 0x8: // OnAfterScreenDraw
   if (pDispParams->cArgs != 1) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG hdc;
    VariantInit(&hdc);
    hr = VariantChangeTypeEx(&hdc, &(pDispParams->rgvarg[0]), lcid, 0, VT_I4);
    OnAfterScreenDraw(hdc.lVal);
   }
   break;

  case 0x9: // OnAfterDraw
   if (pDispParams->cArgs != 2) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG viewDrawPhase;
    VariantInit(&viewDrawPhase);
    hr = VariantChangeTypeEx(&viewDrawPhase, &(pDispParams->rgvarg[0]), lcid, 0, VT_I4);
    OnAfterDraw(pDispParams->rgvarg[0], viewDrawPhase.lVal);
   }

  case 0xa: // OnExtentUpdated
   if (pDispParams->cArgs != 3) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG sizeChanged;
    VariantInit(&sizeChanged);
    hr = VariantChangeTypeEx(&sizeChanged, &(pDispParams->rgvarg[1]), lcid, 0, VT_BOOL);
    OnExtentUpdated(pDispParams->rgvarg[2], sizeChanged.boolVal, pDispParams->rgvarg[0]);
   }
   break;
   
  case 0xb: // OnFullExtentUpdated
   if (pDispParams->cArgs != 2) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    OnFullExtentUpdated(pDispParams->rgvarg[1], pDispParams->rgvarg[0]);
   }
   break;

  case 0xc: // OnOleDrop
   // 不处理该消息。
   break;

  case 0xd: // OnKeyDown
   if (pDispParams->cArgs != 2) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG keyCode, shift;
    VariantInit(&keyCode);
    VariantInit(&shift);
    hr = VariantChangeTypeEx(&keyCode, &(pDispParams->rgvarg[1]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&shift, &(pDispParams->rgvarg[0]), lcid, 0, VT_I4);
    OnKeyDown(keyCode.lVal, shift.lVal);
   }
   break;

  case 0xe: // OnKeyUp
   if (pDispParams->cArgs != 2) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    VARIANTARG keyCode, shift;
    VariantInit(&keyCode);
    VariantInit(&shift);
    hr = VariantChangeTypeEx(&keyCode, &(pDispParams->rgvarg[1]), lcid, 0, VT_I4);
    hr = VariantChangeTypeEx(&shift, &(pDispParams->rgvarg[0]), lcid, 0, VT_I4);
    OnKeyUp(keyCode.lVal, shift.lVal);
   }
   break;

  case 0xf: // OnMapReplaced
   if (pDispParams->cArgs != 1) {
    return DISP_E_BADPARAMCOUNT;
   }
   else {
    OnMapReplaced(pDispParams->rgvarg[0]);
   }
   break;

  default:
   break;
  }
  return S_OK;
 }
 
 VOID OnMouseDown(LONG button, LONG shift, LONG x, LONG y, DOUBLE mapX, DOUBLE mapY);
 VOID OnMouseUp(LONG button, LONG shift, LONG x, LONG y, DOUBLE mapX, DOUBLE mapY);
 VOID OnMouseMove(LONG button, LONG shift, LONG x, LONG y, DOUBLE mapX, DOUBLE mapY);
 VOID OnDoubleClick(LONG button, LONG shift, LONG x, LONG y, DOUBLE mapX, DOUBLE mapY);
 VOID OnSelectionChanged();
 VOID OnViewRefreshed(VARIANT ActiveView, LONG viewDrawPhase, VARIANT layerOrElement, VARIANT envelope);
 VOID OnBeforeScreenDraw(LONG hdc);
 VOID OnAfterScreenDraw(LONG hdc);
 VOID OnAfterDraw(VARIANT display, LONG viewDrawPhase);
 VOID OnExtentUpdated(VARIANT displayTransformation, VARIANT_BOOL sizeChanged, VARIANT newEnvelope);
 VOID OnFullExtentUpdated(VARIANT displayTransformation, VARIANT newEnvelope);
 /*VOID OnOleDrop(esriControlsDropAction dropAction, VARIANT dataObjectHelper, LONG * effect, LONG button, LONG shift, LONG x, LONG y); //*/
 VOID OnKeyDown(LONG keyCode, LONG shift);
 VOID OnKeyUp(LONG keyCode, LONG shift);
 VOID OnMapReplaced(VARIANT newMap); 

}；

 

方法三

  该方法是实现接口IMapControlEvents2Helper，代码如下（参见）：

class MapControlEvents : public IMapControlEvents2Helper
{
 public:

  // IUnknown 
  IUNKNOWN_METHOD_DEFS

  MapControlEvents();

  // IMapControlEvents2
  void OnAfterDraw(VARIANT display, long viewDrawPhase);
  void OnAfterScreenDraw(long hdc);
  void OnBeforeScreenDraw(long hdc);
  void OnDoubleClick(long button, long shift, long x, long y,
                     double mapX, double mapY);
  void OnExtentUpdated(VARIANT displayTransformation,
                       VARIANT_BOOL sizeChanged, VARIANT newEnvelope);
  void OnFullExtentUpdated(VARIANT displayTransformation,
                           VARIANT newEnvelope);
  void OnKeyDown(long keyCode, long shift);
  void OnKeyUp(long keyCode, long shift);
  void OnMapReplaced(VARIANT newMap);
  void OnMouseDown(long button, long shift, long x, long y,
                   double mapX, double mapY);
  void OnMouseMove(long button, long shift, long x, long y,
                   double mapX, double mapY);
  void OnMouseUp(long button, long shift, long x, long y,
                 double mapX, double mapY);
  void OnOleDrop(esriControlsDropAction dropAction, VARIANT dataObjectHelper,
                 long* effect, long button, long shift, long x, long y);
  void OnSelectionChanged();
  void OnViewRefreshed(VARIANT ActiveView, long viewDrawPhase,
                       VARIANT layerOrElement, VARIANT envelope);
};

 

 

  1. Create a global variable of your class type, along with an IEventListenerHelperPtr one. They will need to be deleted when the application is closed; making them globals will make that easier to do. 

    MapControlEvents* g_mapControlEvents;
IEventListenerHelperPtr g_ipMapControlEvent2Helper;
  2. Listen for the MapControl events from within main. This needs to be done before the top-level widget is realized. 
    // Listen for MapControlEvents
g_mapControlEvents = new MapControlEvents();
g_ipMapControlEvent2Helper.CreateInstance(CLSID_MapControlEvents2Listener);
g_ipMapControlEvent2Helper->Startup(static_cast (g_mapControlEvents));
g_ipMapControlEvent2Helper->AdviseEvents(g_ipMapControl, NULL);

// Start the application running 
XtRealizeWidget(g_topLevel);
  3. Make sure to also stop listening for the events when your application closes. 
    // Function called when WM_DELETE_WINDOW protocol is passed
void CloseAppCallback(Widget w, XtPointer client_data, XtPointer call_data)
{
  g_ipMapControlEvent2Helper->UnadviseEvents();
  g_ipMapControlEvent2Helper->Shutdown();
  g_ipMapControlEvent2Helper = 0;
  delete g_mapControlEvents;
  ...
}

 

 

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