mohelp.cpp

不错的东西

#include "stdafx.h"
#include <math.h>
#include <afxctl.h>
#include "maphelper.h"
CDataDir::CDataDir()
:	m_path("")
{

  char  szPath[MAX_PATH];
  GetCurrentDirectory(MAX_PATH,szPath);
  CString currentDir(szPath);
  int pos = currentDir.Find("MFC");
  if (pos >= 0)
		m_path =  (currentDir.Left(pos-1)) + TEXT("\\Data");
  else
    m_path = "";
}

CString CDataDir::GetPath()
{
	return m_path;
}

void CDataDir::SetPath(LPCTSTR newPath)
{
	m_path = newPath;
}


///////////////////////////////////////////////////////////////////////////
// File name handling
// get file path
CString GetFileDirectory(const CString& path)
{
	ASSERT(path.GetLength());
	int pos = path.ReverseFind('\\');
	if (pos >= 0)
		return path.Left(pos);
	return "";
}
//Get file name
CString GetFileName(const CString& path)
{
	ASSERT(path.GetLength());
	int pos = path.ReverseFind('\\');
	if (pos >= 0)
		return path.Right(path.GetLength() - pos - 1);
	return "";
}

CString GetFileExt(const CString& path)
{
	ASSERT(path.GetLength());
	int pos = path.ReverseFind('.');
	if (pos >= 0)
		return path.Right(path.GetLength() - pos - 1);
	return "";
}
//get file title
CString GetFileTitle(const CString& path)
{
	ASSERT(path.GetLength());
	CString strResult = GetFileName(path);
	int pos = strResult.ReverseFind('.');
	if (pos >= 0)
		return strResult.Left(pos);
	return strResult;
}

///////////////////////////////////////////////////////////////////////////
// Layer Management
//
void AddLayer(CMap1& map, const CString& path, COLORREF color, LPDISPATCH renderer)
{
	// Establish connection to data...........................
	CMoDataConnection conn;
	if (!conn.CreateDispatch(TEXT("MapObjects2.DataConnection")))
		throw "unable to create MapObjects2.DataConnection";
	//设置要连接的数据所在的路径
	conn.SetDatabase(GetFileDirectory(path));
	if (!conn.Connect())
		throw "unable to connect to database";
    //......................................................
	// Add layer specified by path
	//连接相应的矢量数据集
	CMoLayers layers(map.GetLayers());//CMoLayers是map控件中所有矢量数据与栅格数据的集合
	CMoMapLayer layer;
 	if (!layer.CreateDispatch(TEXT("MapObjects2.MapLayer")))
		throw "unable to create MapObjects2.MapLayer";
	//创建一个空间数据集对象
	CMoGeoDataset geoDataset(conn.FindGeoDataset(GetFileTitle(path)));
	//挂接,将矢量数据集对象与创建的空间数据集对象进行连接
	layer.SetGeoDataset(geoDataset);
	if (color != -1)		// Set color if specified
	{
		//确定地图上要素层或几何图形的显示
		CMoSymbol layerSymbol(layer.GetSymbol());
		layerSymbol.SetColor(color);
	}

	if (renderer)
		layer.SetRenderer(renderer);
	layers.Add(layer);
}