parsing EMF with GDI

Question

Hello Mahesh,

I have read your interesting article regarding parsing EMF files with GDI+.

http://www.c-sharpcorner.com/uploadfile/mahesh/working-with-metafiles-in-gdi/

 

I tried to follow your guidlines, but somehow my callback function is not triggered.

You can see my code below.

I would highly appreciate your feedback regarding what am I doing wrong?

 

Thanks in advance,

Danny

 

 

// emf2gdi.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#include <iostream>

using namespace std;

#include <windows.h>

#include <gdiplus.h>

using namespace Gdiplus;

using namespace System;

#pragma comment (lib, "gdiplus.lib")

#using <mscorlib.dll>

#using <System.dll>

#using <System.Windows.Forms.dll>

#using <System.Drawing.dll>

using namespace System::Windows::Forms;

using namespace System;

using namespace System::Drawing;

using namespace System::Drawing::Imaging;

using namespace System::Drawing::Text;

//using namespace System::Drawing::Drawing2D;

//using namespace System::Runtime::ConstrainedExecution;

//using namespace System::Globalization;

//using namespace System::Runtime::Versioning;

/*static bool CALLBACK EnumMetaCB(Gdiplus::EmfPlusRecordType recordType, int flags, int dataSize, IntPtr data, System::Drawing::Imaging::PlayRecordCallback^ callbackData) {

string str = " ";

cout << "At EnumMetaCB\n";

// Play only EmfPlusRecordType.FillEllipse records

if (recordType == Gdiplus::EmfPlusRecordTypeFillEllipse

|| recordType == Gdiplus::EmfPlusRecordTypeFillRects

|| recordType == Gdiplus::EmfPlusRecordTypeDrawEllipse

|| recordType == Gdiplus::EmfPlusRecordTypeDrawRects) {

str = "Record type:" + recordType.ToString() +

", Flags:" + flags.ToString() +

", Data :" + data.ToString();

MessageBox.Show(str);

}

return true;

}*/

class EMF2GDI {

public:

static BOOL CALLBACK metaCallback(Gdiplus::EmfPlusRecordType recordType, unsigned int flags, unsigned int dataSize, const unsigned char* pStr, void* callbackData) {

cout << "In callback function...\n";

// Play only EmfPlusRecordTypeFillEllipse records.

if (recordType == EmfPlusRecordTypeFillEllipse) {

// Explicitly cast callbackData as a metafile pointer, and use it to call

// the PlayRecord method.

//pThis->m_pMetafile->PlayRecord(recordType, flags, dataSize, pStr);

static_cast < Gdiplus::Metafile* > (callbackData)->PlayRecord(recordType, flags, dataSize, pStr);

}

return TRUE;

}

VOID EnumerateMetaFile_Click() {

//HDC hdc = CreateCompatibleDC(NULL);

//Gdiplus::Graphics graphics(hdc);

// Create a Metafile object from an existing disk metafile.

// This constructor creates a Metafile::Metafile object for playback

Status status;

Gdiplus::Metafile* pMeta = new Gdiplus::Metafile(L"C:\\ProgramData\\Temp\\2015-03-02.11.20.52.45-00003.EMF");

//use the meta as an argument to the constructor to open for reading

Gdiplus::Graphics g(pMeta);

Gdiplus::MetafileHeader* header = new Gdiplus::MetafileHeader();

status = pMeta->GetMetafileHeader(L"C:\\ProgramData\\Temp\\2015-03-02.11.20.52.45-00003.EMF", header);

BOOL isEmf = header->IsEmf();

BOOL isDual = header->IsEmfPlusDual();

BOOL isPlusOnly = header->IsEmfPlusOnly();

//HENHMETAFILE hEmf = pMeta->GetHENHMETAFILE();

//Gdiplus::Metafile* playbackMeta = new Gdiplus::Metafile(hEmf, TRUE);

//pView->m_pMetafile = playbackMeta;

EMF2GDI* pView = new EMF2GDI();

Gdiplus::Point* point = new Gdiplus::Point(0, 0);

////Gdiplus::Point* pointArray = new Gdiplus::Point[1];

////pointArray[0] = new Gdiplus::Point(0, 0)

Gdiplus::EnumerateMetafileProc* enumMetaCB = new Gdiplus::EnumerateMetafileProc(&metaCallback);

////graphics.EnumerateMetafile(curMetafile, point, 1, EMF2GDI::EnumMetaCB);

g.EnumerateMetafile(pMeta, *point, metaCallback, pMeta);

// Draw pMeta as an image.

//graphics.DrawImage(pMeta, Point(0, 150));

delete pMeta;

}

};

int _tmain(int argc, _TCHAR* argv[]) {

//initialize GDI plus

cout << "Initializing GDI...\n";

//Initializw gdi plus

GdiplusStartupInput gdiplusStartupInput;

ULONG_PTR gdiplusToken;

GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

EMF2GDI emf2gdi;

emf2gdi.EnumerateMetaFile_Click();

//Shut down GdiPlus

GdiplusShutdown(gdiplusToken);

//Adding a return 0 to main will close the console app

//return 0;

}