#1 Burning Software

Hi,

recently I have started to test the StarBurn SDK.
It looks good and seems to be adequate for my project.
But, unfortunately I'm stuck with a conversion problem:

error C2440: 'type cast' : cannot convert from 'overloaded-function' to 'PCALLBACK'

The following statement from the FindDevice.c sample is a candidate for this kind of error:

l__LONG__NumberOfCdvdDevices =
StarBurn_FindDevice(
SCSI_DEVICE_RO_DIRECT_ACCESS,
FALSE,
( PCALLBACK )( FindCallback ), // this is the problem
NULL);

My programming environment is Visual C++ 2005.

Any one have a clue how to overcome the probleme?

Regards,

Jens.

The problem has nothing to do with the StarBurn itself rather it's C++ programming issue You cannot pass address of the member as getting address need to have static member. This raises another problem - all the member variables touched from static method also need to be static. This cannot always be done. So you should do something like this (little trick):

class CBurner
{
private:
...

protected:
...

public:

static long __stdcall CallbackWrapper( void *context );

virtual long Callback( void *context );

};


long
__stdcall
CBurner::CallbackWapper( void *context )
{
CBurner *burner = ( CBurner * )( contex );

return CBurner->Callback( context );
}


long
CBurner::Callback( void *context )
{
// Do whatever you want to do with the non-static members
}


Now you need to pass CallbackWrapper as the callback address. It's static so casting will not fail. From inside the static code you do cast from void* to "this" (basically) and call virtual method

Here we are

Let me know did it help or not.

Thanks!

Dear Anton Kolomyeytsev,


I act the fool. Having a static member is the answer.
Thank you! Your wrapper sample was very helpful,
now the test is runnig fine.


Best regards,

Jens.

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