I am trying to convert EML in to MSG file. I create mapi object IMessage on IStorage object; Assign class-id CLSID_Message to IStorage object; Parse EML file, read properties and assign them to mapi IMessage object; Called Save() on mapi IMessage object; Called Commit() on IStorage object; The generated MSG file was not readable by Outlook. So I tried another method, as briefed below.
Created 2nd IMessage object on IStorage; Called IMessage::CopyTo() on 1st IMessage object, to transfer data to 2nd IMessage that is hosted on IStorage object; Generated MSG file was again unreadable by OutLook.
If I create IMessage object inside PST then the generated MSG file is readable by OutLook. I think there is something happening when I create IMessage on IStorage. I am able to read PR_SUBJECT from the IMessage object, so EML->MAPI conversion has taken place(this code has worked for years).
Here the code
void EmlToMapiTest()
{
const wchar_t* msgFileName = L"C:\\M1.msg";
const wchar_t* emlFileName = L"C:\\E1.eml";
IStorage* pIStorage = 0;
IMessage* pIMessage = 0;
DWORD gfMode = STGM_CREATE | STGM_TRANSACTED | STGM_READWRITE;
STGOPTIONS sOptions = {0};
sOptions.usVersion = 1;
sOptions.ulSectorSize = 4096;
IMalloc* lpMalloc = MAPIGetDefaultMalloc();
HRESULT hr = ::StgCreateStorageEx(msgFileName,
gfMode, STGFMT_DOCFILE, 0, &sOptions, 0, IID_IStorage,
(void**)&pIStorage);
WriteClassStg(pIStorage, CLSID_IMessage);
hr = OpenIMsgOnIStg(NULL ,
Mapi::MAPIAllocateBuffer,
Mapi::MAPIAllocateMore,
Mapi::MAPIFreeBuffer,
lpMalloc,
NULL,
pIStorage,
NULL, 0, MAPI_UNICODE, &pIMessage);
_bstr_t bstrEMlFile = emlFileName;
DoConvert(bstrEMlFile,pIMessage); //Our own Mime <-> Mapi library
pIMessage->SaveChanges(KEEP_OPEN_READWRITE);
pIStorage->Commit(STGC_DEFAULT);
pIMessage->Release();
pIStorage->Release();
}
Please let me know if any of you have experience with this stuff.
Thank you
Try to open the MSG file in OutlookSpy (I am its author) - click OpenIMsgOnIStg button. Are any properties missing compared to a good message?
Then try to use IConverterSession to perform the conversion.
What is the exact error displayed by Outlook? Make sure you correctly set the
PR_MESSAGE_CLASS
property.