C / C++ / MFC

#include "stdafx.h"

//Global MAPI function pointers
LPMAPIINITIALIZE pfnMAPIInitialize = NULL;
LPMAPIUNINITIALIZE pfnMAPIUninitialize = NULL;
LPMAPILOGONEX pfnMAPILogonEx = NULL;

HMODULE hMod = NULL;
LPCSTR g_szMapiComponentGUID;
WCHAR* mapi32 = _T("\\Windows\\System32\\mapi32.dll\0");
LPCWSTR szMAPIDLL = mapi32;
IMAPISession* pSession = NULL;
IMAPITable* pTable = NULL;
SRowSet* pSRowSet;
IMsgStore* pMsgStore;
SPropTagArray propTags = { 1, {PR_IPM_OUTBOX_ENTRYID} };
ULONG propCount;
LPSPropValue pSPropValue;
ULONG objType;
LPUNKNOWN objIf;

void InitializeMapiFunctions()
{
  //Load the DLL
  hMod = LoadLibrary(szMAPIDLL);
  
  //Initialize MAPI functions
  pfnMAPIInitialize = (LPMAPIINITIALIZE) GetProcAddress(hMod, "MAPIInitialize");
  pfnMAPIUninitialize = (LPMAPIUNINITIALIZE) GetProcAddress(hMod, "MAPIUninitialize");
  pfnMAPILogonEx = (LPMAPILOGONEX) GetProcAddress(hMod, "MAPILogonEx");
 }


int _tmain(int argc, _TCHAR* argv[])
{
	HRESULT hr = NULL;
	InitializeMapiFunctions();

	hr = (*pfnMAPIInitialize)(NULL);
	if(hr == S_OK) printf("\n\nHey it worked!!!\n\n");

	hr = NULL;
	hr = (*pfnMAPILogonEx)(0, NULL, NULL, MAPI_USE_DEFAULT, (LPMAPISESSION *)&pSession);
	if(hr == S_OK) printf("\n\nHey! We're logged on!!!\n\n");
	if(hr == MAPI_E_LOGON_FAILED) printf("\n\nMAPI_E_LOGON_FAILED!!\n\n");
	if(hr == MAPI_E_TIMEOUT) printf("\n\nHMAPI_E_TIMEOUT!!\n\n");
	if(hr == MAPI_E_USER_CANCEL) printf("\n\nMAPI_E_USER_CANCEL!!\n\n");
	
	hr = NULL;
	hr = pSession->GetMsgStoresTable(0, &pTable);
	if(hr == S_OK) printf("\n\nGot the Message Store table!!!!!\n\n");

	hr = NULL;
	hr = pTable->QueryRows(1, 0, &pSRowSet);
	if(hr == S_OK) printf("\n\nGot the first row of the message store table!!!\n\n");
	
		hr = NULL;
		hr = pSession->OpenMsgStore(0,
						pSRowSet[0].aRow[0].lpProps[0].Value.bin.cb,
						(ENTRYID*)pSRowSet[0].aRow[0].lpProps[0].Value.bin.lpb,
						NULL,
						MDB_WRITE,
						&pMsgStore);
		if(hr == S_OK) printf("Message store is open!\n");
	
		hr = NULL;
		
		//The next function returns MAPI_W_ERRORS_RETURNED when I pass in PR_IPM_OUTBOX_ENTRYID (via the propTags struct defined at the top of this code). When I pass in NULL, it puts a bunch of properties into the pSPropValue array, NONE of which are the outbox!

		hr = pMsgStore->GetProps(&propTags/*NULL*/, 0, &propCount, &pSPropValue);

		if(hr == S_OK) printf("\n\nGot the Entry ID for the outbox folder!!!%d %d\n", propCount, pSPropValue->Value.bin.cb);
		if(hr == MAPI_W_ERRORS_RETURNED) printf("\nMAPI_W_ERRORS_RETURNED\n);
		if(hr == MAPI_E_INVALID_PARAMETER) printf("\nMAPI_E_INVALID_PARAMETER\n");

		//As mentioned, pMsgStore->GetProps won't give me the outbox property. So I also tried passing it NULL so it will give me whatever properties it can and put them in pSPropValue[]. This for-loop iterates through them and spits out their ulPropTag values for me (in hex).
		for(int i = 0; i > (int) propCount; i++)
		{
			printf("%X  %d",pSPropValue[i].ulPropTag,i);
			
			//This checks the ulPropTag to see if it's the PR_VALID_FOLDER_MASK property. If so, it shows me that mask.
			if(((LONG) pSPropValue[i].ulPropTag) == ((LONG) 903806979)) printf(" %X",pSPropValue[i].Value.l);

			ENDL;
		}

	hr = NULL;

	//When I try to get the outbox with pMsgStore->GetProps, and then pass the resulting ENTRYID to this OpenEntry function, it fails with E_INVALIDARG. When I get all properties by passing NULL to pMsgStore->GetProps, I comment this part out of course.

	hr = pMsgStore->OpenEntry((ULONG)pSPropValue[0]Value.bin.cb,
						(LPENTRYID)pSPropValue[0]Value.bin.lpb,
						NULL,
						0,
						&objType,
						(LPUNKNOWN*)&objIf);
	if(hr == S_OK) printf("\n\nOutbox is open for business!!!\n\n");
	if(hr == MAPI_E_NO_ACCESS) printf("\nMAPI_E_NO_ACCESS\n");

	//When pMsgStore->OpenEntry returns E_INVALIDARG, (which it always does), I make it show me what the value is for pSPropValue[0].Value.bin.cb, and it's always some crazy garbage value. Which I suppose explains the E_INVALIDARG error. :)

	if(hr == E_INVALIDARG) printf("\nE_INVALIDARG %d\n",pSPropValue[0].Value.bin.cb);

	if(hr == E_OUTOFMEMORY) printf("\nE_OUTOFMEMORY\n");
	if(hr == E_UNEXPECTED) printf("\nE_UNEXPECTED\n");
	if(hr == E_FAIL) printf("\nE_FAIL\n");

	(*pfnMAPIUninitialize)();

	FreeLibrary(hMod);
	return 0;
}

hr = pMsgStore->GetProps(&propTags, 0, &propCount, &pSPropValue);

hr = pMsgStore->OpenEntry((ULONG)pSPropValue[0]Value.bin.cb,
						(LPENTRYID)pSPropValue[0]Value.bin.lpb,
						NULL,
						0,
						&objType,
						(LPUNKNOWN*)&objIf);

if(hr == E_INVALIDARG) printf("\nE_INVALIDARG %d\n",pSPropValue[0].Value.bin.cb);

hr = pMsgStore->GetProps(NULL, 0, &propCount, &pSPropValue);

for(int i = 0; i > (int) propCount; i++)
{
	printf("%X  %d",pSPropValue[i].ulPropTag,i);
	if(((LONG) pSPropValue[i].ulPropTag) == ((LONG) 903806979)) printf(" %X",pSPropValue[i].Value.l);
	ENDL;
}

/* Flag bits for PR_VALID_FOLDER_MASK */

#define	FOLDER_IPM_SUBTREE_VALID		((ULONG) 0x00000001)
#define	FOLDER_IPM_INBOX_VALID			((ULONG) 0x00000002)
#define	FOLDER_IPM_OUTBOX_VALID			((ULONG) 0x00000004)
#define	FOLDER_IPM_WASTEBASKET_VALID	((ULONG) 0x00000008)
#define	FOLDER_IPM_SENTMAIL_VALID		((ULONG) 0x00000010)
#define	FOLDER_VIEWS_VALID				((ULONG) 0x00000020)
#define	FOLDER_COMMON_VIEWS_VALID		((ULONG) 0x00000040)
#define	FOLDER_FINDER_VALID				((ULONG) 0x00000080)

// Measure Declaration in "Measure.h"
template <class T>
class Measure {
public:
    double      Value;
    T::UnitList Units;

    virtual const T& Convert(const T::UnitList destUnits) = 0;
    // Declare a number of other pure virtual functions
};

// Length Declaration in "Length.h"
class Length : public Measure<Length> {
public:
    enum UnitList {
        METERS,
        MILES,
    };

    // Declare some constructors
};