Convert C string in to BSTR with CA_CString​ToBSTR()

I want to convert C string in to BSTR format with function CA_CStringToBSTR.
I call an ActiveX function. In this function is CA_CStringToBSTR called.
------------ActiveX Function ---------------------
HRESULT state;
char buf[50]="0.0";
BSTR bstr=0;
state = CA_CStringToBSTR(buf, &bstr);
return ......;(0x80070057 error code "Wrong parameter")
Debuger after this Fun gives me the following result: state=0, bstr=0xXXXX(48)(No size Info)   [48=0x30='0']
Then I get error from this ActiveX function. I think the problem is here with this CA-CStrng..... Function.
Is that correct, what does this function? 

You should never send C structs over the wire, otherwise you are expecting the other end to know (a) the source machine's byte order (b) the source machine's C compiler's alignment and padding rules (c) the source machine's C compiler's options in effect for the compilation of the program some of which can affect (b).
Instead you should write each field separately in network byte order using htons(), htonl(), &c, or use something like XDR. If you do the former make sure the output is buffered so you don't write thousands of tinygrams.

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