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CoCreateInstance returns strange value

Started by peter86 Sep 26, 2002 at 3:41 PM 4 replies 550+ views

Original Post

Sep 26, 2002 at 3:41 PM

The returnvalue I get from CoCreateInstance dosen´t match with any of it´s return values. Is anything wrong with my switch-statement or how could or how can happend?

  
hr = CoCreateInstance(CLSID_DirectMusicPerformance, NULL, CLSCTX_INPROC, IID_IDirectMusicPerformance8, (void**) &g_pMusicPerformance);
	
if(FAILED(hr))
{
	switch (hr)
	{
	case REGDB_E_CLASSNOTREG:
		DISPLAYMSG("REGDB_E_CLASSNOTREG");
		return 0;
			
	case CLASS_E_NOAGGREGATION:
		DISPLAYMSG("CLASS_E_NOAGGREGATION");
		return 0;
		
	default:
		DISPLAYMSG("Unknown error!");
		return 0;
	}
}

coder_x

Sep 26, 2002 at 4:26 PM

Have you called CoInitialize before your call to CoCreateInstance ?

peter86

Sep 27, 2002 at 1:59 AM

Yes, I´ve called CoInitialize before.

S1CA

Sep 27, 2002 at 6:56 AM

So what is the return value then ? (it''d be kinda helpful if you told us!

).

Preferably in hexadecimal.

...So we can take off the severity bits, isolate the facility code and look the error code itself up in winerror.h to tell you what you''re doing wrong.

--
Simon O''Connor
Creative Asylum Ltd
www.creative-asylum.com

peter86

Sep 27, 2002 at 10:31 AM

I couldn´t think of that I hadn´t called CoInitialize, but I had not made that call. Sorry for the wrong answear before.

Shannon Barber

Sep 28, 2002 at 12:47 AM

Why don''t you add the error for ''not coinitialized'' to your switch?

I use a couple of macros, and built a library for my error cooking function:

  
#define HR2StringCase(Case_)\
	case Case_:\
		strcpy(szHR, #Case_);\
	break;

void __cdecl HR2String(HRESULT hr, char* szHR)
	{
	switch(hr)
		{
		HR2StringCase(S_OK)
		HR2StringCase(S_FALSE)
		
		HR2StringCase(REGDB_E_CLASSNOTREG);
		
		HR2StringCase(E_FAIL)
		HR2StringCase(E_NOTIMPL)
		HR2StringCase(E_INVALIDARG)
		HR2StringCase(E_POINTER)
		HR2StringCase(E_NOINTERFACE)
		//on & on...

	}

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