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ivan  
#1 Posted : Monday, April 11, 2011 5:10:42 AM(UTC)
ivan

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C++/CLI Example

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.

// 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

Code:

#include "stdafx.h" 

using namespace System; 
using namespace System::Text; 
using namespace System::Text::RegularExpressions; 
using namespace System::Collections; 
using namespace System::IO; 

// Add EAGetMail namespace
using namespace EAGetMail; 

String^ _FormatHtmlTag( String ^src ) 
{ 
    src = src->Replace( ">", ">" ); 
    src = src->Replace( "<", "&lt;" ); 
    return src; 
} 

// We generate a html + attachment folder for every email, once the html is create,
// next time we don't need to parse the email again.
void _GenerateHtmlForEmail( String ^htmlName, String ^emlFile, String ^tempFolder ) 
{ 
    Mail ^oMail = gcnew Mail("TryIt"); 
    oMail->Load( emlFile, false ); 

    if( oMail->IsEncrypted ) 
    { 
        try 
        { 
            // This email is encrypted, we decrypt it by user default certificate.
            // you can also use specified certificate like this
            // Certificate ^oCert = gcnew Certificate();
            // oCert->Load("c:\\test.pfx", "pfxpassword",
            // Certificate::CertificateKeyLocation::CRYPT_USER_KEYSET);
            // oMail = oMail->Decrypt( oCert );
            oMail = oMail->Decrypt( nullptr ); 
        } 
        catch(Exception ^ep ) 
        { 
            Console::WriteLine( ep->Message ); 
            oMail->Load( emlFile, false ); 
        } 
    } 

    if( oMail->IsSigned ) 
    { 
        try 
        { 
            // This email is digital signed.
            EAGetMail::Certificate ^cert = oMail->VerifySignature(); 
            Console::WriteLine( "This email contains a valid digital signature."); 

            // You can add the certificate to your certificate storage like this
            // cert->AddToStore(
            // Certificate::CertificateStoreLocation::CERT_SYSTEM_STORE_CURRENT_USER,
            // "addressbook" );
            // then you can use send the encrypted email back to this sender.
        } 
        catch(Exception ^ep ) 
        { 
            Console::WriteLine( ep->Message ); 
        } 
    } 

    String ^html = oMail->HtmlBody; 
    StringBuilder ^hdr = gcnew StringBuilder(); 

    hdr->Append( "<font face=\"Courier New,Arial\" size=2>" ); 
    hdr->Append( String::Format( "<b>From:</b> {0}<br>", 
                   _FormatHtmlTag(oMail->From->ToString()))); 
    array<MailAddress^>^ addrs = oMail->To; 
    int count = addrs->Length; 
    if( count > 0 ) 
    { 
        hdr->Append( "<b>To:</b> "); 
        for( int i = 0; i < count; i++ ) 
        { 
            hdr->Append( _FormatHtmlTag(addrs[i]->ToString())); 
            if( i < count - 1 ) 
            { 
                hdr->Append( ";" ); 
            } 
        } 
        hdr->Append( "<br>" ); 
    } 

    addrs = oMail->Cc; 

    count = addrs->Length; 
    if( count > 0 ) 
    { 
        hdr->Append( "<b>Cc:</b> "); 
        for( int i = 0; i < count; i++ ) 
        { 
            hdr->Append( _FormatHtmlTag(addrs[i]->ToString())); 
            if( i < count - 1 ) 
            { 
                hdr->Append( ";" ); 
            } 
        } 
        hdr->Append( "<br>" ); 
    } 

    hdr->Append( String::Format( "<b>Subject:</b>{0}<br>\r\n", 
            _FormatHtmlTag(oMail->Subject))); 

    array<Attachment^>^ atts = oMail->Attachments; 
    count = atts->Length; 
    if( count > 0 ) 
    { 
        if( !Directory::Exists( tempFolder )) 
            Directory::CreateDirectory( tempFolder ); 

        hdr->Append( "<b>Attachments:</b>" ); 
        for( int i = 0; i < count; i++ ) 
        { 
            Attachment ^att = atts[i]; 

            // This attachment is in OUTLOOK RTF format, decode it here.
            if( String::Compare( att->Name, "winmail.dat" ) == 0 ) 
            { 
                array<Attachment^>^ tatts = nullptr; 
                try 
                { 
                    tatts = Mail::ParseTNEF( att->Content, true ); 
                } 
                catch(Exception ^ep ) 
                { 
                    Console::WriteLine( ep->Message ); 
                    continue; 
                } 

                int y = tatts->Length; 
                for( int x = 0; x < y; x++ ) 
                { 
                    Attachment ^tatt = tatts[x]; 
                    String ^tattname = String::Format( "{0}\\{1}", tempFolder, tatt->Name ); 
                    tatt->SaveAs( tattname , true ); 
                    hdr->Append( 
                        String::Format("<a href=\"{0}\" target=\"_blank\">{1}</a> ", 
                        tattname, tatt->Name )); 
                } 
                continue; 
            } 

            String ^attname = String::Format( "{0}\\{1}", tempFolder, att->Name ); 
            att->SaveAs( attname , true ); 
            hdr->Append( String::Format( "<a href=\"{0}\" target=\"_blank\">{1}</a> ", 
                attname, att->Name )); 
            String^ simage = "image/"; 
            if( att->ContentID->Length > 0 ) 
            { 
                // Show embedded image.
                html = html->Replace( String::Format( "cid:{0}", att->ContentID), attname ); 
            } 
            else if( String::Compare( att->ContentType, 0, 
                  "image/", 0, simage->Length, true ) == 0 ) 
            { 
                // show attached image.
                html = String::Concat( html, 
                   String::Format( "<hr><img src=\"{0}\">", attname )); 
            } 
        } 
    } 

    Regex ^reg = gcnew Regex( "(<meta[^>]*charset[ \t]*=[ \t\"]*)([^<> \r\n\"]*)", 
        (RegexOptions)(RegexOptions::Multiline | RegexOptions::IgnoreCase)); 
    html = reg->Replace( html, "$1utf-8" ); 
    if( !reg->IsMatch( html )) 
    { 
        hdr->Insert( 0, 
        "<meta HTTP-EQUIV=\"Content-Type\" Content=\"text-html; charset=utf-8\">" ); 
    } 

    html = html->Insert( 0, "<hr>" ); 
    html = html->Insert( 0, hdr->ToString()); 

    FileStream ^fs = gcnew FileStream(htmlName, 
        FileMode::Create,FileAccess::Write, FileShare::None ); 
    array<unsigned char>^ data = System::Text::UTF8Encoding::UTF8->GetBytes( html ); 
    fs->Write(data, 0, data->Length); 
    fs->Close(); 
    oMail->Clear(); 
} 

void ConvertMailToHtml(String ^fileName) 
{ 
    try 
    { 
        int pos = fileName->LastIndexOf("."); 
        String ^mainName = fileName->Substring(0, pos); 
        String ^htmlName = mainName + ".htm"; 

        String ^tempFolder = mainName; 
        if (!File::Exists(htmlName)) 
        { 
            // We haven't generate the html for this email, generate it now.
            _GenerateHtmlForEmail(htmlName, fileName, tempFolder); 
        } 

        Console::WriteLine("Please open {0} to browse your email", 
            htmlName); 
    } 
    catch (Exception ^ep) 
    { 
        Console::WriteLine(ep->Message); 
    } 
} 

int main(array<System::String ^> ^args) 
{ 

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

    return 0; 
} 

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