[RESOLVED] could you say how to send string parameters to a ATL com method

[raghunadhs]

Hi All,

i want to create a ATL com Object, and add this object as a reference to my VB application.
my ATL com should contain 3 parametes. two are input parameters of type string, and an out put parameter of type long.

when i try to pass strings as parameters, the .lib file is being crated and i am able to add it as a reference to my VB application also. but when i try to run the VB application, an error is coming like "Memory out of space".

i am thinking that the strings what i am passing from vb application are not compatible with the parameters in ATL Com.

in ATL com the method is as follows.

STDMETHODIMP CSampleFun::Method1(char *S1, char *S2, long *n)
{
	// TODO: Add your implementation code here
          *n=40;
	return S_OK;
}

please let me know how to pass string parameters.

Thanks in advance...

[cheenu_vasan]

You need to pass it as a Pointer object meaning character array obviously...

[raghunadhs]

Hi cheenu_vasan,
i could not get you. could u please explain detailed?

Thanks in advance...

[cheenu_vasan]

Meaning try using the BSTR datatype which is a predefined string which should be used, since VB is object based instead of Object Oriented ...

[raghunadhs]

Hi cheenu_vasan,

i tried like this...

STDMETHODIMP CSampleFunction14::Method14(BSTR S1, BSTR S2, long *Num)
{
	// TODO: Add your implementation code here
	*Num=40;
	return S_OK;
}

It is working good. Thanks.....