Registration-free COM

re: Registration-free COM

Tharabai — Tue, 29 Nov 2005 16:05:07 GMT

Hi I have a .net based .tlb which i want to use in CPP code. May I know how to use it without registration of com. Here is the sample code:

#include <stdio.h>
#include <windows.h>
#include "OBJBASE.h"
#include <time.h>
#include "RCSTlbImp.h"
#import "REWDIntf.tlb" named_guids
void RCSLinkLib()
{
HINSTANCE hins=NULL;
DWORD dwRetVal = 0;

CoInitialize(NULL);
REWDIntf::IRCSManagedInterface *pRcsDllInterface= NULL; //Reference to the class

hins=LoadLibrary("C:/WINDOWS/SYSTEM32/REWDIntf.dll");
DWORD dwErr = GetLastError();

RCS_test=(RCSTest)GetProcAddress(hins,"REWDIntf::RCSTest");

// DllGetClassObject(REWDIntf::CLSID_REWDIntf, REWDIntf::IID_IRCSManagedInterface,reinterpret_cast<void**>(&pRcsDllInterface));
dwErr = GetLastError();
CoUninitialize();

}

void main()
{
RCSLinkLib();
int i = RCS_test(1);
}

re: Registration-free COM

Mikhail Arkhipov (MSFT) — Fri, 23 Dec 2005 09:42:48 GMT

DllGetClassObject is only able to retrieve IClassFactory interface, it cannot retrieve custom interfaces. You need to implement class factory (if you are using ATL, it should acready be there). Then you call DllGetClassObject and receive IClassFactory. Then you call IClassFactory::CreateInstance passing GUID of the desired class and receive back IUnknown from the requested class. Now you can QI the instance to your custom interface.

Emulating CoCreateInstance() « lallous’ lab

Emulating CoCreateInstance() « lallous’ lab — Mon, 29 Jan 2007 19:38:35 GMT

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