Mapinfo加载图片文件通用类

  工作中用到将图片文件加载到mapinfo中以打印，下面共享用与图片加载的通用类：CLoadImg2MI

  并在最后给出一个简单示例。请注意，在将图片加载到mapinfo前需要创建一个关联该图片的tab文件，同时在该文件中指定控制点坐标（最少需要三个，下文使用的是图片四个顶点，用于一般的非GIS图片）、映射坐标系、数据版本、坐标单位等。

 

 因为时间关系，写得比较匆忙，若有人指出错误，将非常感谢。同时，欢迎GIS同行与我交流。

// LoadImg2MI.h: interface for the CLoadImg2MI class. /******************************************************************** created: 2009/02/24 created: 24:2:2009 14:44 filename: E:/项目//NaviHighWayPrintArea/LoadImg2MI.h file path: E:/项目//NaviHighWayPrintArea file base: LoadImg2MI file ext: h author: Lonefox purpose: 该类用于在mapinfo中加载图片 *********************************************************************/ // #if !defined(AFX_LOADIMG2MI_H__B0A520BC_9378_4CEF_8B01_7A44FE2D4356__INCLUDED_) #define AFX_LOADIMG2MI_H__B0A520BC_9378_4CEF_8B01_7A44FE2D4356__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #include "mapinfow.h" enum UnitName //坐标单位，未列举所有支持的单位 { unPoint, unCM, unMeter, unDegree }; struct ControlPoint //图片匹配控制点 { double XinPic; //图片中坐标 double YinPic; double XinMap; //映射后坐标 double YinMap; CString Name; //控制点名 public: void SetPoint(double x, double y, double newx, double newy, const CString& name) { this->XinPic = x; this->YinPic = y; this->XinMap = newx; this->YinMap = newy; this->Name = name; } }; class CLoadImg2MI { public: CLoadImg2MI(); virtual ~CLoadImg2MI(); ControlPoint* CreateControlPoints(double xP1, double yP1, double xM1, double yM1, double xP2, double yP2, double xM2, double yM2); //根据对角两点坐标创建四元素控制点数组 void ReleaseControlPoints(ControlPoint* pPoints);//删除控制点数组 void SetPicturePath(const CString& Path); //设置图片完整路径 void SetMapUnit(const UnitName Unit); //设置地图单位 void SetControlPoints(ControlPoint* const pPoints, int nCount);//设置控制点数组 bool LoadImage(DMapInfo* const pMap, CString TabName = ""); //加载图片到mapinfo protected: bool CreateTabFile(const CString& FileName = ""); //由图片文件生成tab文件 virtual CString GetCharset() { return "WindowsSimpChinese"; }//字符集 virtual CString GetCoordSys() { return "CoordSys Earth Projection 1, 0"; }//获取投影坐标系 virtual CString GetUnitStr(const UnitName Unit); //获取坐标单位字符串，未写完所有支持的单位，可修改 protected: CString m_strPicPath; //图片路径 CString m_strTabPath; //转换后的Tab文件路径 UnitName m_unMapUnit; //地图坐标单位 ControlPoint* m_pPoints; //控制点数组 int m_nCPCount; //控制点个数 }; #endif // !defined(AFX_LOADIMG2MI_H__B0A520BC_9378_4CEF_8B01_7A44FE2D4356__INCLUDED_)   

下面是CPP // LoadImg2MI.cpp: implementation of the CLoadImg2MI class. // // #include "stdafx.h" #include "LoadImg2MI.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif // // Construction/Destruction // CLoadImg2MI::CLoadImg2MI() { m_nCPCount = 0; m_pPoints = NULL; m_strPicPath = m_strTabPath = _T(""); m_unMapUnit = unDegree; //默认度 } CLoadImg2MI::~CLoadImg2MI() { } /************************************************* Function : CLoadImg2MI::CreateControlPoints Description : 根据对角两点坐标创建四元素控制点数组,两个点是两个对角点位 Calls : Called By : Parameter : [double xP1] --- 图片上坐标1x : [double yP1] --- 图片上坐标1y : [double xM1] --- 地图中对应坐标1x : [double yM1] --- 地图中对应坐标1y : [double xP2] --- 图片上坐标2x : [double yP2] --- 图片上坐标2y : [double xM2] --- 地图中对应坐标2x : [double yM2] --- 地图中对应坐标2y Return : ControlPoint* --- 控制点数组，四个元素 Author : Lonefox Date : 2009-02-24 Modify : *************************************************/ ControlPoint* CLoadImg2MI::CreateControlPoints( double xP1, double yP1, double xM1, double yM1, double xP2, double yP2, double xM2, double yM2 ) { ControlPoint* Points = new ControlPoint[4]; Points[0].SetPoint(xP1, yP1, xM1, yM1, "pt 1"); Points[1].SetPoint(xP2, yP1, xM2, yM1, "pt 2"); Points[2].SetPoint(xP2, yP2, xM2, yM2, "pt 3"); Points[3].SetPoint(xP1, yP2, xM1, yM2, "pt 4"); return Points; } void CLoadImg2MI::SetPicturePath( const CString& Path ) { ASSERT(Path != ""); this->m_strPicPath = Path; } void CLoadImg2MI::SetMapUnit( const UnitName Unit ) { this->m_unMapUnit = Unit; } CString CLoadImg2MI::GetUnitStr( const UnitName Unit ) { switch (Unit) { case unDegree: return "degree"; break; case unCM : return "cm"; break; default: return "ft"; } } /************************************************* Function : CLoadImg2MI::CreateTabFile Description : 根据图片文件创建tab文件 Calls : Called By : Parameter : [const CString& FileName] --- 要生成的文件名,不包含扩展名，默认空时和图片名相同 Return : bool --- 成功返回true，否则返回false Author : Lonefox Date : 2009-02-24 Modify : *************************************************/ bool CLoadImg2MI::CreateTabFile(const CString& FileName /* = "" */) { /************************************************************************/ /* Tab文本输出内容 !table !version 300 !charset WindowsSimpChinese Definition Table File "无标题.bmp" Type "RASTER" (116.293547,39.990871) (6,4) Label "LeftTop", (116.295386,39.990954) (990,5) Label "RightTop", (116.293474,39.990452) (18,742) Label "LeftDown", (116.295422,39.990438) (1000,749) Label "RightDown" CoordSys Earth Projection 1, 0 Units "degree" */ /************************************************************************/ //1.数据校验 ASSERT(this->m_strPicPath != ""); if (GetFileAttributes(this->m_strPicPath) == 0xFFFFFFFF)//文件可能不存在 { TRACE(FileName + "可能文件不存在!/n"); return false; } //2.获取tab路径 CString strFileName(""); int nPos = 0; if ( (nPos = m_strPicPath.ReverseFind('//')) == -1 ) { return false; } strFileName = m_strPicPath.Mid(nPos + 1);//获取文件名 if (FileName == "") //使用和pic相同的tab名 { if ( (nPos = m_strPicPath.ReverseFind('.')) == -1 ) //查找扩展名 { return false; } m_strTabPath = m_strPicPath.Left(nPos) + ".tab"; //tab文件路径 } else { m_strTabPath.Format("%s//%s.tab", m_strPicPath.Left(nPos), FileName); //新tab文件名 } //3.生成tab文件 CStdioFile f; if (!f.Open(m_strTabPath, CFile::modeCreate | CFile::modeWrite | CFile::shareDenyWrite)) { return false; } f.WriteString("!table/n"); f.WriteString("!version 300/n"); f.WriteString("!charset " + GetCharset() + "/n/n"); f.WriteString("Definition Table/n"); f.WriteString("File /""); f.WriteString(strFileName); f.WriteString("/"/n"); f.WriteString("Type /"RASTER/"/n"); //3.1生成控制点信息 if (m_nCPCount > 0 && m_pPoints) { CString strTmp(_T("")); for (int nIndex = 0; nIndex < m_nCPCount - 1; nIndex++) { strTmp.Format("(%f,%f) (%f,%f) Label /"%s/",/n", //先地图坐标后图片坐标 m_pPoints[nIndex].XinMap, m_pPoints[nIndex].YinMap, m_pPoints[nIndex].XinPic, m_pPoints[nIndex].YinPic, m_pPoints[nIndex].Name); f.WriteString(strTmp); } strTmp.Format("(%f,%f) (%f,%f) Label /"%s/"/n", m_pPoints[m_nCPCount - 1].XinMap, m_pPoints[m_nCPCount - 1].YinMap, m_pPoints[m_nCPCount - 1].XinPic, m_pPoints[m_nCPCount - 1].YinPic, m_pPoints[m_nCPCount - 1].Name); f.WriteString(strTmp); } //3.3写投影系 f.WriteString(GetCoordSys()); f.WriteString("/n"); //3.4写地图单位 f.WriteString("Units /""); f.WriteString(GetUnitStr(m_unMapUnit)); //获取地图单位 f.WriteString("/"/n"); f.Close(); return true; } void CLoadImg2MI::ReleaseControlPoints( ControlPoint* pPoints ) { if (pPoints) { delete []pPoints; pPoints = NULL; } } void CLoadImg2MI::SetControlPoints( ControlPoint* const pPoints, int nCount ) { ASSERT(nCount != 0 || pPoints != NULL); m_pPoints = pPoints; m_nCPCount = nCount; } /************************************************* Function : CLoadImg2MI::LoadImage Description : 加载图片到mapinfo Calls : Called By : Parameter : [const DMapInfo* pMap] --- mapbasic指针 : [CString TabName ] --- 图片加载后的表名，空时使用mapinfo默认表名 Return : bool --- 成功返回true，失败返回false Author : Lonefox Date : 2009-02-24 Modify : *************************************************/ bool CLoadImg2MI::LoadImage( DMapInfo* const pMap, CString TabName /*= ""*/ ) { ASSERT(pMap != NULL); ASSERT(this->m_strPicPath != ""); if (!this->CreateTabFile(TabName)) //创建tab文件失败 { return false; } if (this->m_strTabPath == "") { return false; } //开始加载 CString strCmd(_T("")); if (TabName != "") { strCmd.Format("Open Table /"%s/" AS %s Interactive", m_strTabPath, TabName); } else { strCmd.Format("Open Table /"%s/" Interactive", m_strTabPath); } pMap->Do(strCmd); //加载 return true; }

 

应用示例：

CLoadImg2MI LoadImg; ControlPoint* pPoints = LoadImg.CreateControlPoints(gdXLeftDown, gdYLeftDown, x1, y1, gdXRightUp, gdYRightUp, x2, y2); //创建控制点 LoadImg.SetMapUnit(unCM); LoadImg.SetPicturePath(strPath); LoadImg.SetControlPoints(pPoints, 4); if (!LoadImg.LoadImage(&mapinfo, strPatternLayer)) //加载失败 { ASSERT(NULL); } LoadImg.ReleaseControlPoints(pPoints);

 

注意：UnitName和GetUnitStr只简单写了我用到的单位，使用者可以自行修改扩充。

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