[Dev-C++] Re: CoCreateInstance(..) errors

[Steve H. <st...@sj...>]

Mark Ament wrote:

> Hi Steve,
>
> I'm using your suggestion, but it has no effect.
> I still get an error from CoCreateInstance: 0x800401F0
> It is CO_E_NOTINITIALIZED
> 'Failed to connect to server'
>
> Surfing the internet results in hints that it may have something to do 
> with 'MsiInstaller', 'Events'.
> 'Exchange Server 5.5 Service Pack 2 (SP2)', 'CoInitialize has not been 
> called'.
>
> I tried using OleInitialize(..) or CoInitializeEx(..) but these crash!
>
> I've now found the solution!
> I use CoInitialize(NULL) in stead of CoInitializeEx(..)
>
> Thanks for your help by the way :)
>
> greetings,
>
> Mark Ament
>
> ----- Original Message ----- From: "Steve Higham" <st...@sj...>
> To: "Mark Ament" <am...@ho...>
> Cc: <dev...@li...>
> Sent: Thursday, August 11, 2005 7:05 PM
> Subject: Re: [Dev-C++] Windows, COM, CoCreateInstance and OleInitialize
>
>
>> Mark Ament wrote:
>>
>>> Hi there!
>>> I was trying all possibilities of DEV-C++ and I was pretty excited 
>>> about it.
>>> But I've encountered a problem.
>>> In the Windows-operating-systems it is pretty important to use 
>>> components (COM).
>>> I've made a "windows application" project and added the following code:
>>> ----------------------------------------
>>> const CLSID CLSID_Printing = 
>>> {0x76A73923,0xD88C,0x11D6,{0xB5,0x51,0xEB,0xCE,0x0B,0x59,0xDA,0x72}};
>>> const IID IID_IUnknown = 
>>> {0x00000000,0x0000,0x0000,{0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}};
>>> const IID IID_IClassFactory 
>>> ={0x00000001,0x0000,0x0000,{0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}};
>>> const CLSID CLSID_MySimpleObj 
>>> ={0x14C0CBCC,0x8E68,0x4BB0,{0xB4,0x49,0x2D,0x9D,0xFB,0x80,0x9A,0x16}};
>>> const IID IID_IMySimpleObj 
>>> ={0x14C0CBCD,0x8E68,0x4BB0,{0xB4,0x49,0x2D,0x9D,0xFB,0x80,0x9A,0x16}};
>>> interface IMySimpleObj : public IUnknown {
>>> virtual HRESULT msg()=0;
>>> };
>>> int WINAPI WinMain (HINSTANCE hThisInstance,
>>> HINSTANCE hPrevInstance,
>>> LPSTR lpszArgument,
>>> int nFunsterStil) {
>>> MessageBox(0,"Test Start..","Project2",0);
>>> //OleInitialize(0); //<-Creates a crash!
>>> IUnknown * schaap;
>>> schaap = NULL;
>>> HRESULT hr;
>>> hr = 
>>> CoCreateInstance(CLSID_MySimpleObj,0,CLSCTX_INPROC,IID_IUnknown,(void**)&schaap); 
>>>
>>> if (schaap!=NULL) {
>>> MessageBox(0,"Test CoCreateInstance Worked!","Project2",0);
>>> schaap->Release();
>>> schaap = NULL;
>>> }
>>> //OleUninitialize();
>>> MessageBox(0,"Test Done..","Project2",0);
>>> //HERE THE REST OF THE WinMain-Code!
>>> }
>>>
>>> ----------------------------------------
>>> Secondly: in the menu 'Project' -> 'Project Options' --tab-> 
>>> Parameters --button-> Add Library or Object
>>> I've added the OLE32.LIB from Microsoft Visual C++ 5.0.
>>> The problem is that CoCreateInstance never succeeds in creating an 
>>> object!
>>> So I also tried to do a "OleInitialize(0)", but this one always 
>>> results in crashing!
>>> I hope this problem can be solved to meet the important requirement 
>>> of using COM in DEV-C++ !
>>> greetings,
>>> Mark Ament
>>
>>
>> Hi Mark,
>>
>> I'm using COM without any problems.
>>
>> I'm using the libraries that came with Dev-Cpp - Try using 
>> Dev-Cpp\lib\libole32.a. This should work fine.
>>
>> Regards,
>>
>> Steve
>>
>> -- 
>>
>> Steve Higham
>>
>> › st...@sj... <mailto:st...@sj...>
>>
>>
>
>
>
Hi Mark,

My code also uses CoInitialize(NULL).

Regards,

Steve

-- 

Steve Higham

› st...@sj... <mailto:st...@sj...>