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ivan  
#1 Posted : Monday, May 2, 2011 5:14:53 AM(UTC)
ivan

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Visual C++ Example

The following code demonstrates how to convert email to a HTML page and display it using Web browser in C#.

After the email was converted to HTML page, you can browse it with web browser. You can get everything in the HTML page such as From, To, Cc, Subject, Date, Attachments and Embedded images.

Code:

// The following example codes demonstrate converting email to HTML page
// To get full sample projects, please download and install EAGetMail on your machine.
// To run it correctly, please change email server, user, password, folder, file name value to yours

#include "stdafx.h" 
#include <atlbase.h> 
#include <atlcom.h> 
#include <atlstr.h> 

#include "eagetmailobj.tlh" 
using namespace EAGetMailObjLib; 

CString 
_FormatHtmlTag( LPCTSTR lpszSrc ) 
{ 
    CString src = lpszSrc; 

    src.Replace( _T(">"), _T("&gt;")); 
    src.Replace( _T("<"), _T("&lt;")); 
    return src; 
} 

void _GenerateHtmlForEmail( CString &htmlName, CString &emlFile, CString& tempFolder ) 
{ 
    IMailPtr oMail; 
    oMail.CreateInstance( "EAGetMailObj.Mail"); 
    oMail->LicenseCode = _T("TryIt"); 
    oMail->LoadFile( emlFile.GetString(), VARIANT_FALSE ); 

    if( oMail->IsEncrypted == VARIANT_TRUE ) 
    { 
        //this email is encrypted, we decrypt it by user default certificate.
        oMail = oMail->Decrypt( NULL ); 

    } 

    if( oMail->IsSigned == VARIANT_TRUE ) 
    { 
        // This email is digital signed.
        ICertificatePtr oCert = oMail->VerifySignature(); 
        _tprintf(_T("This email contains a valid digital signature.\r\n")); 
    } 

    CString html = (TCHAR*)oMail->HtmlBody; 
    CString hdr; 
    hdr.Preallocate( 1024 * 5 ); 

    hdr.Append( _T("<font face=\"Courier New,Arial\" size=2>")); 
    hdr.Append( _T("<b>From:</b> ")); 

    CString tp = (TCHAR*)oMail->From->Name; 
    tp += _T("<"); 
    tp += (TCHAR*)oMail->From->Address; 
    tp += _T(">"); 
    hdr.Append( _FormatHtmlTag(tp.GetString())); 
    hdr.Append( _T("<br>")); 

    long LBound = 0, UBound = 0; 
    SAFEARRAY *psa = NULL; 

    _variant_t arAddr = oMail->To; 

    psa = arAddr.parray; 
    SafeArrayGetLBound( psa, 1, &LBound ); 
    SafeArrayGetUBound( psa, 1, &UBound ); 

    INT count = UBound-LBound+1; 
    if( count > 0 ) 
    { 
        hdr.Append( _T("<b>To:</b> ")); 
        for( long i = LBound; i <= UBound; i++ ) 
        { 
            _variant_t vtAddr; 
            SafeArrayGetElement( psa, &i, &vtAddr ); 

            IMailAddressPtr pAddr; 
            vtAddr.pdispVal->QueryInterface( __uuidof(IMailAddress), (void**)&pAddr ); 

            tp = (TCHAR*)pAddr->Name; 
            tp += _T("<"); 
            tp += (TCHAR*)pAddr->Address; 
            tp += _T(">"); 

            hdr.Append( _FormatHtmlTag( tp.GetString())); 
            if( i < UBound ) 
            { 
                hdr.Append( _T(";")); 
            } 
        } 
        hdr.Append( _T("<br>")); 
    } 

    arAddr.Clear(); 
    arAddr = oMail->Cc; 

    psa = arAddr.parray; 
    SafeArrayGetLBound( psa, 1, &LBound ); 
    SafeArrayGetUBound( psa, 1, &UBound ); 

    count = UBound-LBound+1; 
    if( count > 0 ) 
    { 
        hdr.Append( _T("<b>Cc:</b> ")); 
        for( long i = LBound; i <= UBound; i++ ) 
        { 
            _variant_t vtAddr; 
            SafeArrayGetElement( psa, &i, &vtAddr ); 

            IMailAddressPtr pAddr; 
            vtAddr.pdispVal->QueryInterface( __uuidof(IMailAddress), (void**)&pAddr ); 

            tp = (TCHAR*)pAddr->Name; 
            tp += _T("<"); 
            tp += (TCHAR*)pAddr->Address; 
            tp += _T(">"); 

            hdr.Append( _FormatHtmlTag( tp.GetString())); 
            if( i < UBound ) 
            { 
                hdr.Append( _T(";")); 
            } 
        } 
        hdr.Append( _T("<br>")); 
    } 

    hdr.Append( _T( "<b>Subject:</b>" )); 
    hdr.Append( _FormatHtmlTag((TCHAR*)oMail->Subject)); 
    hdr.Append( _T("<br>")); 

    _variant_t atts = oMail->Attachments; 
    psa = atts.parray; 
    SafeArrayGetLBound( psa, 1, &LBound ); 
    SafeArrayGetUBound( psa, 1, &UBound ); 

    count = UBound-LBound+1; 
    if( count > 0 ) 
    { 
        ::CreateDirectory( tempFolder.GetString(), NULL ); 
        hdr.Append( _T("<b>Attachments:</b>")); 
        for( long i = LBound; i <= UBound; i++ ) 
        { 
            _variant_t vtAtt; 
            SafeArrayGetElement( psa, &i, &vtAtt ); 

            IAttachmentPtr pAtt; 
            vtAtt.pdispVal->QueryInterface( __uuidof(IAttachment), (void**)&pAtt ); 

            CString name = (TCHAR*)pAtt->Name; 
            if( name.CompareNoCase( _T("winmail.dat")) == 0 ) 
            { 
                // this attachment is in OUTLOOK RTF (TNEF) format, decode it here.
                _variant_t tatts; 
                tatts = oMail->ParseTNEF( pAtt->Content, VARIANT_TRUE ); 

                long XLBound = 0, XUBound = 0; 

                SAFEARRAY* tpsa = tatts.parray; 
                SafeArrayGetLBound( tpsa, 1, &XLBound ); 
                SafeArrayGetUBound( tpsa, 1, &XUBound ); 
                for( long x = XLBound; x <= XUBound; x++ ) 
                { 
                    _variant_t vttAtt; 
                    SafeArrayGetElement( tpsa, &x, &vttAtt ); 
                    IAttachmentPtr ptAtt; 
                    vttAtt.pdispVal->QueryInterface( __uuidof(IAttachment), (void**)&ptAtt ); 

                    CString tattname = tempFolder; 
                    tattname.Append( _T(\\")); 
                    tattname.Append((TCHAR*)ptAtt->Name ); 
                    ptAtt->SaveAs( tattname.GetString(), VARIANT_TRUE ); 

                    hdr.Append( _T("<a href=\"")); 
                    hdr.Append(tattname); 
                    hdr.Append( _T("\" target=\"_blank\">")); 
                    hdr.Append((TCHAR*)ptAtt->Name); 
                    hdr.Append(_T("</a> ")); 
                } 
                continue; 
            } 

            CString attname = tempFolder; 
            attname.Append(_T(\\")); 
            attname.Append((TCHAR*)pAtt->Name); 
            pAtt->SaveAs( attname.GetString(), VARIANT_TRUE ); 

            hdr.Append( _T("<a href=\"")); 
            hdr.Append(attname); 
            hdr.Append( _T("\" target=\"_blank\">")); 
            hdr.Append((TCHAR*)pAtt->Name); 
            hdr.Append(_T("</a> ")); 

            CString contentID = (TCHAR*)pAtt->ContentID; 
            CString contentType = (TCHAR*)pAtt->ContentType; 
            if( contentID.GetLength() > 0 ) 
            { 
                CString find = _T("cid:"); 
                find.Append( contentID ); 
                // Show embedded image.
                html.Replace( find, attname ); 
            } 
            else if( _tcsnicmp( contentType.GetString(), 
                _T("image/"), _tcslen(_T("image/"))) == 0 ) 
            { 
                // Show attached image
                html.Append( _T("<hr><img src=\"")); 
                html.Append( attname ); 
                html.Append( _T("\">")); 
            } 
        } 
    } 

    hdr.Insert( 0, _T("<meta HTTP-EQUIV=\"Content-Type\" Content=\"text-html; charset=utf-8\">")); 

    html = hdr + "<hr>" + html; 
    IToolsPtr oTools; 
    oTools.CreateInstance("EAGetMailObj.Tools"); 
    oTools->WriteTextFile( htmlName.GetString(), html.GetString(), CP_UTF8 ); 

    oMail->Clear(); 
    oMail.Release(); 
} 

void ConvertMailToHtml( LPCTSTR lpszFile ) 
{ 
    try 
    { 
        CString fileName = lpszFile; 

        int pos = fileName.ReverseFind(_T('.')); 
        CString mainName = fileName.Mid(0, pos); 
        CString htmlName = mainName + _T(".htm"); 

        CString tempFolder = mainName; 
        WIN32_FIND_DATA findData; 
        HANDLE hFind = ::FindFirstFile( htmlName.GetString(), &findData ); 
        BOOL bExist = FALSE; 

        if( hFind != INVALID_HANDLE_VALUE ) 
        { 
            ::FindClose( hFind ); 
            bExist = TRUE; 
        } 

        if( !bExist ) 
        { // We haven't generate the html for this email, generate it now. 
            _GenerateHtmlForEmail( htmlName, fileName, tempFolder ); 
        } 

    } 
    catch( _com_error &ep ) 
    { 
        _tprintf(_T("Error: %s\r\n"), (const TCHAR*)ep.Description()); 
    } 
} 

int _tmain(int argc, _TCHAR* argv[]) 
{ 
    // Initialize COM environment
    ::CoInitialize( NULL ); 

    ConvertMailToHtml(_T("c:\\my folder\\test.eml")); 

    return 0; 
} 

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